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Localized photothermal–chemotherapy synergy via Bi2S3 and sorafenib co-loaded dissolvable microneedles: a non-invasive precision delivery approach for melanoma suppression† 通过Bi2S3和索拉非尼共载可溶微针的局部光热化疗协同作用:一种非侵入性的黑色素瘤抑制精确递送方法†
IF 4.7
Materials Advances Pub Date : 2025-07-14 DOI: 10.1039/D5MA00623F
Mahsa Akbari, Maryam Toolabi, Atefeh Malek-Khatabi, Mohammad Reza Eskandari, Bo Zhi Chen, Xin Dong Guo and Mohammad-Ali Shahbazi
{"title":"Localized photothermal–chemotherapy synergy via Bi2S3 and sorafenib co-loaded dissolvable microneedles: a non-invasive precision delivery approach for melanoma suppression†","authors":"Mahsa Akbari, Maryam Toolabi, Atefeh Malek-Khatabi, Mohammad Reza Eskandari, Bo Zhi Chen, Xin Dong Guo and Mohammad-Ali Shahbazi","doi":"10.1039/D5MA00623F","DOIUrl":"https://doi.org/10.1039/D5MA00623F","url":null,"abstract":"<p >Skin cancer, particularly melanoma, is currently treated through various approaches, including surgery, radiotherapy, and chemotherapy. However, these methods have significant limitations and cause severe side effects. This underscores the pressing need for more effective therapies. Given that this disease appears on the skin surface, it is imperative to have a therapeutic system for topical drug delivery while minimizing systemic distribution. Microneedling is a novel transdermal drug delivery system that creates micropores on the skin surface to bypass the stratum corneum and achieve successful drug delivery to the skin sublayers, in a non-invasive manner. In this study, a dissolvable microneedle (MN) patch is created using polyvinylpyrrolidone (PVP), a water-soluble, biocompatible, and biodegradable polymer. Bismuth sulfide (Bi<small><sub>2</sub></small>S<small><sub>3</sub></small>) nanoparticles (NPs), as a photothermal therapy (PTT) agent, and sorafenib (SFN) for chemotherapy against cancer are co-encapsulated within the MN patch. The Bi<small><sub>2</sub></small>S<small><sub>3</sub></small>-SFN-loaded MN arrays exhibit strong mechanical properties for skin insertion, enabling them to penetrate tumors, dissolve, and release their therapeutic cargos directly within the tumor tissue. Upon exposure to an NIR laser, Bi<small><sub>2</sub></small>S<small><sub>3</sub></small> NPs exhibit a photothermal effect, effectively inhibiting cancer cell proliferation. When combined with the chemotherapeutic capability of SFN, this approach shows great promise in achieving complete tumor suppression. In addition, the local administration of the MNs results in high biosafety and biocompatibility toward healthy tissues <em>in vivo</em>.</p>","PeriodicalId":18242,"journal":{"name":"Materials Advances","volume":" 17","pages":" 5971-5990"},"PeriodicalIF":4.7,"publicationDate":"2025-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.rsc.org/en/content/articlepdf/2025/ma/d5ma00623f?page=search","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144909511","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Single crystal halide perovskites for resistive switching memory devices and artificial synapse 单晶卤化物钙钛矿,用于电阻开关存储器和人工突触
IF 4.7
Materials Advances Pub Date : 2025-07-14 DOI: 10.1039/D5MA00609K
Hyojung Kim
{"title":"Single crystal halide perovskites for resistive switching memory devices and artificial synapse","authors":"Hyojung Kim","doi":"10.1039/D5MA00609K","DOIUrl":"https://doi.org/10.1039/D5MA00609K","url":null,"abstract":"<p >Contemporary systems in artificial intelligence and edge computing require nonvolatile memories that integrate extremely low programming energy with enduring reliability. Halide perovskites exhibit significant potential due to their lattice structures, which promote the interaction of ionic and electronic transport, thus allowing for reliable resistive switching. Despite advancements, polycrystalline films continue to face challenges such as grain-boundary traps and unpredictable ion migration. Consequently, recent efforts have focused on single-crystal architectures to address these issues. Defect-lean ABX<small><sub>3</sub></small> single-crystal halide perovskites meet these requirements as the structured lattice allows swift carrier transport with controlled ion movement. Recent studies have outlined crystallographic principles, manufacturing processes, and interfacial chemistries that produce domains sufficiently coherent to facilitate dependable resistive-switching memories. The removal of grain boundaries in memory elements enhances the stability of ion-mediated electrochemical metallization and valence variation processes, allowing the creation of multilevel states with minimal energy consumption during programming. Ultralow trap populations identified in epitaxial layers promote bias-stable operation when integrated with precisely matched dielectric or polymer interlayers, effectively reducing leakage currents during extended cycling. The orientation of crystals significantly affects the directions of vacancy migration and alters channel conductance, even when subjected to high thermal stress. The integration of insights from growth science and interface modification leads to a comprehensive approach for utilizing simultaneous ionic and electronic transport in single-crystal halide perovskites across various manufacturing scales. Given this foundation, it appears that rapid advancements are on the way for energy-efficient memory and logic components designed for compact, data-intensive electronics that enable artificial intelligence, edge computing, and adaptable wearable technologies shortly.</p>","PeriodicalId":18242,"journal":{"name":"Materials Advances","volume":" 16","pages":" 5410-5418"},"PeriodicalIF":4.7,"publicationDate":"2025-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.rsc.org/en/content/articlepdf/2025/ma/d5ma00609k?page=search","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144814174","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Advancing ovarian cancer care: recent innovations and challenges in the use of MXenes and their composites for diagnostic and therapeutic applications 推进卵巢癌护理:MXenes及其复合材料在诊断和治疗应用中的最新创新和挑战
IF 4.7
Materials Advances Pub Date : 2025-07-12 DOI: 10.1039/D5MA00520E
Neda Farzizadeh, Atefeh Zarepour, Arezoo Khosravi, Siavash Iravani and Ali Zarrabi
{"title":"Advancing ovarian cancer care: recent innovations and challenges in the use of MXenes and their composites for diagnostic and therapeutic applications","authors":"Neda Farzizadeh, Atefeh Zarepour, Arezoo Khosravi, Siavash Iravani and Ali Zarrabi","doi":"10.1039/D5MA00520E","DOIUrl":"https://doi.org/10.1039/D5MA00520E","url":null,"abstract":"<p >Ovarian cancer remains the deadliest form of gynecologic malignancy, largely owing to the absence of reliable early diagnostic tools and the limited effectiveness of current therapeutic strategies. Recent advances in nanotechnology—particularly the emergence of two-dimensional materials known as MXenes—offer promising avenues to address these challenges. This review highlights the emerging role of MXenes and their composites in the management of ovarian cancer, focusing on their potential in biomarker detection and targeted treatment strategies. We provide a comprehensive analysis of the latest studies examining the physicochemical features of MXenes, their synthesis and surface functionalization approaches, and their application in ovarian cancer, including biosensing, drug delivery, and combinatorial therapeutic systems. MXene-based biosensors have shown remarkable detection limits in detecting ovarian cancer biomarkers, such as cancer antigen 125 (CA125), human epididymis protein 4 (HE4), lipolysis-stimulated lipoprotein receptor (LSR), and carcinoembryonic antigen-related cell adhesion molecule 5 (CEACAM5). However, several challenges remain, including issues of biocompatibility, structural stability, and clinical scalability. Continued interdisciplinary research is essential to address these limitations, optimize MXene functionalization, and translate their laboratory success into clinical settings. With appropriate advancements, MXenes hold significant promise for enabling more precise, efficient, and patient-specific approaches to ovarian cancer diagnosis and therapy.</p>","PeriodicalId":18242,"journal":{"name":"Materials Advances","volume":" 17","pages":" 5807-5830"},"PeriodicalIF":4.7,"publicationDate":"2025-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.rsc.org/en/content/articlepdf/2025/ma/d5ma00520e?page=search","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144909498","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Dyes and their toxicity: removal from wastewater using carbon dots/metal oxides as hybrid materials: a review 碳点/金属氧化物复合材料去除废水中染料及其毒性研究进展
IF 4.7
Materials Advances Pub Date : 2025-07-11 DOI: 10.1039/D5MA00572H
Kawan F. Kayani, Sewara J. Mohammed, Muhammad S. Mustafa and Shujahadeen B. Aziz
{"title":"Dyes and their toxicity: removal from wastewater using carbon dots/metal oxides as hybrid materials: a review","authors":"Kawan F. Kayani, Sewara J. Mohammed, Muhammad S. Mustafa and Shujahadeen B. Aziz","doi":"10.1039/D5MA00572H","DOIUrl":"https://doi.org/10.1039/D5MA00572H","url":null,"abstract":"<p >Clean water and a hygienic living environment are fundamental necessities for a healthy life. However, both domestic and industrial carcinogenic dyes have significantly reduced drinkable water sources and caused severe ecological problems. This situation seriously threatens human civilization, sustainable global development, and the marine ecosystem. Researchers have focused on advanced techniques to remove or degrade toxic dyes more effectively than conventional wastewater treatment methods to address these challenges. This study explores an efficient, quick, and cost-effective approach for degrading and removing toxic dyes from wastewater using carbon dots (CDs) and metal oxides (MOs). The hybrid CD/MO system offers several advantages over traditional methods, including enhanced optical properties, improved catalytic efficiency, structural modification, enhanced adsorption capacity, superior charge transfer, and increased chemical stability. This review provides a detailed introduction to dyes and their classifications, as well as the environmental and health impacts of dyes. It then describes various dye removal methods and, for the first time, explores the application of hybrid carbon dot/metal oxide systems for removing toxic dyes from wastewater. Additionally, we discuss current challenges and future perspectives in dye removal, aiming to provide an overview of recent advancements in wastewater treatment, highlight the associated challenges, and suggest potential future directions.</p>","PeriodicalId":18242,"journal":{"name":"Materials Advances","volume":" 16","pages":" 5391-5409"},"PeriodicalIF":4.7,"publicationDate":"2025-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.rsc.org/en/content/articlepdf/2025/ma/d5ma00572h?page=search","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144814173","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Efficient dual-phase visual detection of pesticides in real samples with electron-rich emitters carrying multiple twists† 携带多重扭曲的富电子发射器在实际样品中农药的高效双相视觉检测
IF 4.7
Materials Advances Pub Date : 2025-07-10 DOI: 10.1039/D5MA00630A
Shivani Tripathi and Manab Chakravarty
{"title":"Efficient dual-phase visual detection of pesticides in real samples with electron-rich emitters carrying multiple twists†","authors":"Shivani Tripathi and Manab Chakravarty","doi":"10.1039/D5MA00630A","DOIUrl":"https://doi.org/10.1039/D5MA00630A","url":null,"abstract":"<p >Precise monitoring of pesticides in daily consumable items and the environment is crucial to save society. By considering numerous challenges, such as the cost, operational difficulties, and portability of existing pesticide detection strategies, we herein introduce simple, low-cost triphenylamine (TPA)-enriched structurally diverse π-conjugates as potential dual-state emitters for rapid and visual detection of pesticides, mainly trifluralin (TN; highly toxic to aquatic animals and affects fertile soil) and fenitrothion (FN; an organophosphorus insecticide, lethal to humans on high exposure). Other pesticides, <em>i.e.</em>, glyphosate (GP) and imidacloprid (IM), also poorly responded. The newly designed small molecules displayed intense, visually detectable emission in both solution and solid states due to the extensive π-conjugations and multiple twisted sites in the molecular structures. An increment of the TPA units increases the energy of the LUMO of the probes, and thus, the emission profiles alter in solution and solid states. However, these probes are capable of detecting TN and FN selectively through photo-induced electron transfer (PET) and inner-filter effect (IFE) mechanisms, and can be recognised through the naked eye. Among the three probes, AIEEgen <strong>TT1</strong> showed the maximum efficiency with a detection limit up to 180 nM due to favorable PET/IFE and its crystalline nature that would facilitate capturing the analytes in the void space. All the findings are well elucidated with experimental and theoretical support. Thus, a handy paper-based platform is presented to visually recognize TN and FN pesticide residues present in soil, fruits, and vegetables. Such an inexpensive protocol would help common people to test household items before handling them.</p>","PeriodicalId":18242,"journal":{"name":"Materials Advances","volume":" 17","pages":" 5928-5939"},"PeriodicalIF":4.7,"publicationDate":"2025-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.rsc.org/en/content/articlepdf/2025/ma/d5ma00630a?page=search","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144909507","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Outstanding Reviewers for Materials Advances in 2024 2024年材料进展杰出评审员
IF 5.2
Materials Advances Pub Date : 2025-07-10 DOI: 10.1039/D5MA90051D
{"title":"Outstanding Reviewers for Materials Advances in 2024","authors":"","doi":"10.1039/D5MA90051D","DOIUrl":"https://doi.org/10.1039/D5MA90051D","url":null,"abstract":"<p >We would like to take this opportunity to thank all of <em>Materials Advances</em>’ reviewers for helping to preserve quality and integrity in the chemical science literature. We would also like to highlight the Outstanding Reviewers for <em>Materials Advances</em> in 2024.</p>","PeriodicalId":18242,"journal":{"name":"Materials Advances","volume":" 15","pages":" 4938-4938"},"PeriodicalIF":5.2,"publicationDate":"2025-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.rsc.org/en/content/articlepdf/2025/ma/d5ma90051d?page=search","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144716432","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Dual-functional Tm3+/Yb3+-doped LiCaLa(MoO4)3 phosphors: high-sensitivity thermal sensing and deep-tissue NIR bio-imaging 双功能Tm3+/Yb3+掺杂LiCaLa(MoO4)3荧光粉:高灵敏度热传感和深层组织近红外生物成像
IF 4.7
Materials Advances Pub Date : 2025-07-10 DOI: 10.1039/D5MA00489F
Ikhlas Kachou, Kamel Saidi, Zein El Abidine Aly Taleb, Christian Hernández-Álvarez, Mohamed Dammak and Inocencio R. Martín
{"title":"Dual-functional Tm3+/Yb3+-doped LiCaLa(MoO4)3 phosphors: high-sensitivity thermal sensing and deep-tissue NIR bio-imaging","authors":"Ikhlas Kachou, Kamel Saidi, Zein El Abidine Aly Taleb, Christian Hernández-Álvarez, Mohamed Dammak and Inocencio R. Martín","doi":"10.1039/D5MA00489F","DOIUrl":"https://doi.org/10.1039/D5MA00489F","url":null,"abstract":"<p >Thermal sensing and optical bio-imaging are critical in materials science for applications ranging from biomedical diagnostics to industrial monitoring. Herein, we report the first-time synthesis of a novel Mo-based host matrix, LiCaLa(MoO<small><sub>4</sub></small>)<small><sub>3</sub></small>, co-doped with Tm<small><sup>3+</sup></small>/Yb<small><sup>3+</sup></small>, specifically designed for upconversion luminescence with dual optical functionalities. These phosphors were engineered to exhibit red and near-infrared (NIR) emissions for dual-functional optical sensing and imaging. The temperature-dependent NIR fluorescence (650–1000 nm) was systematically investigated to evaluate their potential as thermal sensors within the first biological window (650–950 nm), which is essential for <em>in vivo</em> applications due to minimal tissue absorption. Using the fluorescence intensity ratio (FIR) method under 975 nm excitation, the phosphor demonstrated exceptional thermal sensitivity in two distinct regimes: (i) a high relative sensitivity of 2.62% K<small><sup>−1</sup></small> at 298 K from thermally coupled energy levels, enabling precise low-temperature detection with sub-degree resolution, and (ii) a robust relative sensitivity of 1.4% K<small><sup>−1</sup></small> at elevated temperatures (up to 748 K) from non-thermally coupled levels, suitable for high-temperature industrial sensing. Unlike previously reported host lattices, our LiCaLa(MoO<small><sub>4</sub></small>)<small><sub>3</sub></small> system integrates both temperature sensing and deep-tissue imaging capabilities into a single structure, offering a rare and efficient multifunctional solution. Furthermore, the material achieved tissue penetration depths of 4 mm, validating its dual utility for luminescence-based thermal sensing and deep-tissue bio-imaging. These findings not only highlight the unique properties of the LiCaLa(MoO<small><sub>4</sub></small>)<small><sub>3</sub></small> matrix but also establish it as a pioneering multifunctional platform in the field of NIR-based nanodiagnostics.</p>","PeriodicalId":18242,"journal":{"name":"Materials Advances","volume":" 16","pages":" 5546-5557"},"PeriodicalIF":4.7,"publicationDate":"2025-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.rsc.org/en/content/articlepdf/2025/ma/d5ma00489f?page=search","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144814208","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Synergistic bifunctional conjugated microporous polymer as an organic anode containing tetraphenylethene and thianthrene-5,5′,10,10′-tetraoxide units for lithium and sodium-ion batteries† 含四苯乙烯和噻吩-5,5 ',10,10 ' -四氧化物单元的协同双功能共轭微孔聚合物作为锂离子电池和钠离子电池的有机阳极
IF 4.7
Materials Advances Pub Date : 2025-07-10 DOI: 10.1039/D5MA00654F
Bhargabi Halder, Mohamed Gamal Mohamed, Kannadasan Kalidoss, Ahmed A. K. Mohammed, Poonam Nagendra Singh, Tapomay Mondal, Yunsheng Ye, Perumal Elumalai and Shiao-Wei Kuo
{"title":"Synergistic bifunctional conjugated microporous polymer as an organic anode containing tetraphenylethene and thianthrene-5,5′,10,10′-tetraoxide units for lithium and sodium-ion batteries†","authors":"Bhargabi Halder, Mohamed Gamal Mohamed, Kannadasan Kalidoss, Ahmed A. K. Mohammed, Poonam Nagendra Singh, Tapomay Mondal, Yunsheng Ye, Perumal Elumalai and Shiao-Wei Kuo","doi":"10.1039/D5MA00654F","DOIUrl":"https://doi.org/10.1039/D5MA00654F","url":null,"abstract":"<p >This study reports the synthesis and an early exploration of the electrochemical investigation of a donor–π–acceptor (D–π–A) conjugated microporous polymer (CMP), <strong>TPEHBZ-ThBS</strong>, incorporating tetraphenylethene and thianthrene-5,5′,10,10′-tetraoxide units for reversible Li<small><sup>+</sup></small>/Na<small><sup>+</sup></small> storage. Potentially scalable and sustainable <strong>TPEHBZ-ThBS CMP</strong> is synthesized <em>via</em> Suzuki coupling of 2,8-dibromothianthrene-5,5′,10,10′-tetraoxide (<strong>ThBS-Br<small><sub>2</sub></small></strong>), 1,1,2,2-tetrakis(4-bromophenyl)ethene (<strong>TPEH-Br<small><sub>4</sub></small></strong>), and 1,4-phenylenediboronic acid, and its structure is confirmed through comprehensive characterization. Electrochemical testing in CR-2032 coin cells reveals discharge capacities of 410 mAh g<small><sup>−1</sup></small> (LIB) and 260 mAh g<small><sup>−1</sup></small> (SIB) at 0.1C. Additionally, the lithium-ion full cell using NMC811 as the cathode and <strong>TPEHBZ-ThBS CMP</strong> as the anode exhibits a discharge capacity of 122 mAh g<small><sup>−1</sup></small> at 0.1C-rate. Dunn's method and power-law analysis indicate a hybrid charge storage mechanism, dominated by diffusion-controlled processes. The sulfonyl groups facilitate strong Li<small><sup>+</sup></small>/Na<small><sup>+</sup></small> binding, promoting efficient charge transport. The high redox activity, stable structure, and fully conjugated backbone collectively contribute to the capacity, rate performance, and cycling stability of the CMP, underscoring its potential for advanced energy storage applications.</p>","PeriodicalId":18242,"journal":{"name":"Materials Advances","volume":" 16","pages":" 5633-5647"},"PeriodicalIF":4.7,"publicationDate":"2025-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.rsc.org/en/content/articlepdf/2025/ma/d5ma00654f?page=search","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144814216","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Bonding profiling of gapless ceramic V2GaC/N MAX phases: a spectroscopic and dual theoretical approach† 无间隙陶瓷V2GaC/N MAX相的键合分析:光谱和双重理论方法[j]
IF 4.7
Materials Advances Pub Date : 2025-07-10 DOI: 10.1039/D5MA00222B
Peter Ufondu, Sakshi, Teak D. Boyko, Niels Kubitza, Christina S. Birkel and Alexander Moewes
{"title":"Bonding profiling of gapless ceramic V2GaC/N MAX phases: a spectroscopic and dual theoretical approach†","authors":"Peter Ufondu, Sakshi, Teak D. Boyko, Niels Kubitza, Christina S. Birkel and Alexander Moewes","doi":"10.1039/D5MA00222B","DOIUrl":"https://doi.org/10.1039/D5MA00222B","url":null,"abstract":"<p >The family of MAX phases is growing faster than ever, resulting in more than 340 reported members so far. Even though the variety of different M- and A-elements is overwhelming, the X-site of MAX phases is still mainly dictated by solely carbide-based materials, while nitrogen-based materials, such as nitrides and (carbo)nitrides account for below 10% in total. It follows that more profound studies comparing those three classical MAX phase groups are rare in the literature, particularly in terms of combining computational considerations with high-resolution spectroscopic experiments. Here, we report the electronic properties of three vanadium-based MAX phases: V<small><sub>2</sub></small>GaC, V<small><sub>2</sub></small>GaN, and the (carbo)nitride phase V<small><sub>2</sub></small>GaC<small><sub>1−<em>x</em></sub></small>N<small><sub><em>x</em></sub></small>. This investigation is carried out for C/N K-edge and the V L-edge using soft X-ray absorption (XAS) and emission spectroscopy (XES). We determine the <em>x</em> value to be 0.6 in the (carbo)nitride V<small><sub>2</sub></small>GaC<small><sub>1−<em>x</em></sub></small>N<small><sub><em>x</em></sub></small> phase. Additionally, we determine V<small><sup>2.2+</sup></small> as the formal oxidation state in all three phases using ligand field multiplet theory (LFMT) calculations. Our density functional theory (DFT) calculations indicate the presence of carbon vacancies in the V<small><sub>2</sub></small>GaC phase. DFT and LFMT theoretical methods confirm that the V<small><sub>2</sub></small>GaC has a higher degree of covalency than the V<small><sub>2</sub></small>GaN phase. Also, Gallium interactions are the weakest with C/N and are entirely metallic.</p>","PeriodicalId":18242,"journal":{"name":"Materials Advances","volume":" 16","pages":" 5568-5575"},"PeriodicalIF":4.7,"publicationDate":"2025-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.rsc.org/en/content/articlepdf/2025/ma/d5ma00222b?page=search","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144814210","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Surface-engineered Ir/Au dendritic catalysts with minimal iridium loading for efficient alkaline oxygen evolution† 表面工程的Ir/Au枝晶催化剂与最小的铱负载高效碱性析氧†
IF 4.7
Materials Advances Pub Date : 2025-07-10 DOI: 10.1039/D5MA00476D
Chih-En Tsai, Yi-Ting Wang and Ying-Huang Lai
{"title":"Surface-engineered Ir/Au dendritic catalysts with minimal iridium loading for efficient alkaline oxygen evolution†","authors":"Chih-En Tsai, Yi-Ting Wang and Ying-Huang Lai","doi":"10.1039/D5MA00476D","DOIUrl":"https://doi.org/10.1039/D5MA00476D","url":null,"abstract":"<p >Electrochemical water splitting is a promising strategy for sustainable hydrogen production, yet the sluggish oxygen evolution reaction (OER) at the anode remains a major bottleneck. Here, we report the fabrication of a low-Ir-content electrocatalyst by anchoring sparse Ir atoms onto high-surface-area dendritic gold (Ir/Au-D) <em>via</em> a copper underpotential deposition (UPD) and redox replacement method. Structural characterization confirms the formation of a stable, highly dispersed Ir/Au surface interface without Ir aggregation. Electrocatalytic measurements demonstrate that Ir/Au-D achieves an overpotential of 301 mV at 10 mA cm<small><sup>−2</sup></small> in 1.0 M KOH, a low Tafel slope of 36 mV dec<small><sup>−1</sup></small>, and a turnover frequency (TOF) of 3.03 s<small><sup>−1</sup></small> at 300 mV (<em>vs.</em> 1.23 V), outperforming Pt wire, Ir wire, and bare Au-D electrodes. Stability tests further reveal negligible performance decay over 20 hours of continuous operation. The enhanced OER activity is attributed to the electronic modulation of Ir atoms by the Au substrate and the synergistic effect at the Ir/Au interface, which promotes intermediate formation and product desorption. This hypothesis is experimentally supported by <em>in situ</em> surface-enhanced Raman spectroscopy (SERS), which reveals characteristic bands associated with Ir–O and O–O vibrations under applied potentials. This work provides an effective strategy for maximizing catalytic efficiency through minimal noble metal loading and stable interfacial engineering, offering insights for the design of next-generation low-metal-content OER catalysts.</p>","PeriodicalId":18242,"journal":{"name":"Materials Advances","volume":" 16","pages":" 5677-5686"},"PeriodicalIF":4.7,"publicationDate":"2025-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.rsc.org/en/content/articlepdf/2025/ma/d5ma00476d?page=search","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144814178","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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