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NaOH Promoted Synthesis of β-NaYF4:Yb,Er Nanoparticles with Enhanced Upconversion Luminescence NaOH促进β-NaYF4:Yb,Er纳米粒子的合成并增强上转换发光
IF 2.6 4区 材料科学
ChemNanoMat Pub Date : 2025-05-16 DOI: 10.1002/cnma.202500202
Jing Bai, Dong Fang, Jiali Wen, Chen Bai, Kuiming Nie, Baoxiu Mi, Zhiqiang Gao
{"title":"NaOH Promoted Synthesis of β-NaYF4:Yb,Er Nanoparticles with Enhanced Upconversion Luminescence","authors":"Jing Bai,&nbsp;Dong Fang,&nbsp;Jiali Wen,&nbsp;Chen Bai,&nbsp;Kuiming Nie,&nbsp;Baoxiu Mi,&nbsp;Zhiqiang Gao","doi":"10.1002/cnma.202500202","DOIUrl":"10.1002/cnma.202500202","url":null,"abstract":"<p>Herein, NaOH is innovatively introduced into the solvothermal synthesis of β-NaYF<sub>4</sub>:Yb,Er with environmental benign solvent of ethanol/water solution. It is found that well-crystallized β-NaYF<sub>4</sub> nanoparticles with small sizes around 20–40 nm can be obtained under 240 °C for only 2 h in moderate pH conditions, reducing the typical reaction temperature (300 °C) and time (10 h), and in contrast to the typical acidic condition for solvothermal synthesis of β-NaYF<sub>4</sub>. To further decrease reaction temperature, relatively high alkalinity is needed to overcome the transformation energy barrier from α-NaYF<sub>4</sub> to β-NaYF<sub>4</sub>. Mechanistic investigation reveals that OH<sup>-</sup> promotes the α- to β-phase transition by releasing free F<sup>-</sup> ions and reducing the surface energy of β-phase. An optimal Na/F:Ln<sup>3+</sup> ratio of 5:1 ensures phase purity. Excited at 980 nm, the best β-NaYF<sub>4</sub>:Yb,Er sample exhibits upconversion efficiency of 0.21% peaked at 538 and 654 nm with red to green ratio = 0.75, which is expected to be useful in solar cell applications as a light upconversion strategy to enhance light harvesting.</p>","PeriodicalId":54339,"journal":{"name":"ChemNanoMat","volume":"11 8","pages":""},"PeriodicalIF":2.6,"publicationDate":"2025-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144905325","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
AuCo Nanoparticles Inserted between the Layers of Ti3C2: An Efficient Nanozyme for Aliphatic Nitro-to-Amine Reduction 在Ti3C2层间插入的AuCo纳米颗粒:一种高效的脂肪族亚硝基还原胺纳米酶
IF 2.6 4区 材料科学
ChemNanoMat Pub Date : 2025-05-15 DOI: 10.1002/cnma.202500171
Hui-Juan Guan, Teng-Da Guo, Shu-Hong Liu, Deng Pan, Hui-Min Jia, Wei-Wei He
{"title":"AuCo Nanoparticles Inserted between the Layers of Ti3C2: An Efficient Nanozyme for Aliphatic Nitro-to-Amine Reduction","authors":"Hui-Juan Guan,&nbsp;Teng-Da Guo,&nbsp;Shu-Hong Liu,&nbsp;Deng Pan,&nbsp;Hui-Min Jia,&nbsp;Wei-Wei He","doi":"10.1002/cnma.202500171","DOIUrl":"10.1002/cnma.202500171","url":null,"abstract":"<p>The construction of nanozyme with superior catalytic activity and stable structure is urgently needed in practical application. Herein, AuCo nanoparticles inserted between the layers of Ti<sub>3</sub>C<sub>2</sub> (AuCo/Ti<sub>3</sub>C<sub>2</sub>) are prepared by strong electrostatic adsorption method and thermal treatment process. The nitroreductase-like activity of AuCo/Ti<sub>3</sub>C<sub>2</sub> is explored with a new hydrogenation reaction of 3-nitropropionic acid (3-NPA) to beta-alanine (BA) as probe. AuCo/Ti<sub>3</sub>C<sub>2</sub> shows the highest catalytic activity with TOF value of 4.5 × 10<sup>19</sup> molecules·g<sup>−1</sup>·s<sup>−1</sup> in comparison to Au/Ti<sub>3</sub>C<sub>2</sub> and Co/Ti<sub>3</sub>C<sub>2</sub>, attributing to the synergistic effect of Au and Co. In addition, AuCo/Ti<sub>3</sub>C<sub>2</sub> also has excellent stability, and the conversion rate of 3-NPA still can maintain 100% at the fifth cycle, which is due to the insertion of AuCo nanoparticles between the layers of Ti<sub>3</sub>C<sub>2</sub>, and the insertion prevents the aggregation and the detachment of nanoparticles during repeated uses. The above results demonstrate the feasibility of AuCo/Ti<sub>3</sub>C<sub>2</sub> in practical application. The plausible mechanism of 3-NPA hydrogenation into BA by NaBH<sub>4</sub> in the presence of AuCo/Ti<sub>3</sub>C<sub>2</sub> is proposed. This research provides a promising strategy to enhance the stability of nanozyme, and may open up a new approach in reducing aliphatic nitro to amine.</p>","PeriodicalId":54339,"journal":{"name":"ChemNanoMat","volume":"11 8","pages":""},"PeriodicalIF":2.6,"publicationDate":"2025-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144905353","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Flexing the Future: Strategic Insights into Wearable Sensor Development 柔性未来:可穿戴传感器发展的战略洞察
IF 2.6 4区 材料科学
ChemNanoMat Pub Date : 2025-05-15 DOI: 10.1002/cnma.202500063
Vandana Molahalli, Gowri Soman, Aman Sharma, Kiran Bijapur, Nattaporn Chattham, Ranjith Krishna Pai, Abdullah Alodhayb, Gurumurthy Hegde
{"title":"Flexing the Future: Strategic Insights into Wearable Sensor Development","authors":"Vandana Molahalli,&nbsp;Gowri Soman,&nbsp;Aman Sharma,&nbsp;Kiran Bijapur,&nbsp;Nattaporn Chattham,&nbsp;Ranjith Krishna Pai,&nbsp;Abdullah Alodhayb,&nbsp;Gurumurthy Hegde","doi":"10.1002/cnma.202500063","DOIUrl":"10.1002/cnma.202500063","url":null,"abstract":"<p>Recent advances in materials science, microelectronics, and data analytics have propelled the flexible and wearable sensors field forward. This comprehensive review summarizes the current state of research in flexible and wearable sensors, shedding light on their evolving technology, applications, and potential impact on various industries. The key developments in sensor materials, fabrication techniques, and integration methods, highlighting their implications for human–machine interaction, health monitoring, sports and fitness, and beyond are explored. Additionally, the difficulties and possibilities in this quickly developing field are addressed and perspectives on the future paths and possible uses of wearable and flexible sensors, highlighting their influence on environmental monitoring, personalized technology, and the current healthcare landscape are provided. This review serves as a resource for researchers, engineers, and innovators interested in cutting-edge developments and emerging opportunities in the realm of flexible and wearable sensors.</p>","PeriodicalId":54339,"journal":{"name":"ChemNanoMat","volume":"11 7","pages":""},"PeriodicalIF":2.6,"publicationDate":"2025-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144598334","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Surface Modification of Co3O4 by HfO2 for Efficient Bifunctional Electrocatalyst for Hydrogen and Oxygen Evolution 用HfO2对Co3O4表面进行高效双功能析氢氧电催化剂的改性
IF 2.6 4区 材料科学
ChemNanoMat Pub Date : 2025-05-14 DOI: 10.1002/cnma.202500085
Anju Rani, Sukriti Sagar, Imtiaz Ahmed, Krishna Kanta Haldar
{"title":"Surface Modification of Co3O4 by HfO2 for Efficient Bifunctional Electrocatalyst for Hydrogen and Oxygen Evolution","authors":"Anju Rani,&nbsp;Sukriti Sagar,&nbsp;Imtiaz Ahmed,&nbsp;Krishna Kanta Haldar","doi":"10.1002/cnma.202500085","DOIUrl":"10.1002/cnma.202500085","url":null,"abstract":"<p>This study investigates the significant enhancement of electrocatalytic activity for the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) achieved through surface modification of cobalt oxide (Co<sub>3</sub>O<sub>4</sub>) with hafnium dioxide (HfO<sub>2</sub>). A mechanochemical approach is used to synthesize the surface-modified catalyst, optimizing the electronic properties and active site accessibility of Co<sub>3</sub>O<sub>4</sub> to attain superior electrocatalytic performance. X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) characterization techniques confirmed the successful integration of HfO<sub>2</sub> into the Co<sub>3</sub>O<sub>4</sub> structure, resulting in an altered surface morphology and improved electronic conductivity. Electrochemical assessments demonstrate that the Co<sub>3</sub>O<sub>4</sub>/HfO<sub>2</sub> composite material exhibits exceptionally low overpotentials of 262 and 167 mV for the OER and HER, respectively, at a current density of 10 mA cm<sup>−2</sup>. These values significantly outperform those of unmodified Co<sub>3</sub>O<sub>4</sub>, which presents overpotentials exceeding 467 and 311 mV for the OER and HER, respectively. High mass activity and turnover frequency (TOF) values are observed for the Co<sub>3</sub>O<sub>4</sub>/HfO<sub>2</sub> composite, highlighting the catalyst's efficiency. This outstanding performance is attributed to enhanced charge transfer kinetics and optimized electronic interactions facilitated by the HfO<sub>2</sub> modification. Consequently, this study underscores the potential of the Co<sub>3</sub>O<sub>4</sub>/HfO<sub>2</sub> composite as a cost-effective and efficient electrocatalyst for water-splitting applications, reveal advancements in renewable energy technologies.</p>","PeriodicalId":54339,"journal":{"name":"ChemNanoMat","volume":"11 6","pages":""},"PeriodicalIF":2.6,"publicationDate":"2025-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144255962","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Construction of P2/T Biphasic Na0.44MnO2 Cathode Material Through Addition of Citric Acid for Sodium-Ion Batteries 添加柠檬酸制备钠离子电池用P2/T双相Na0.44MnO2正极材料
IF 2.6 4区 材料科学
ChemNanoMat Pub Date : 2025-05-14 DOI: 10.1002/cnma.202500102
Yuanchao Li, Shixing Han, Pengchao Liang, Xiaokun Shang, Qi Li, Jingjing Ma, Songlin Wang, Li Yang, Guangri Xu
{"title":"Construction of P2/T Biphasic Na0.44MnO2 Cathode Material Through Addition of Citric Acid for Sodium-Ion Batteries","authors":"Yuanchao Li,&nbsp;Shixing Han,&nbsp;Pengchao Liang,&nbsp;Xiaokun Shang,&nbsp;Qi Li,&nbsp;Jingjing Ma,&nbsp;Songlin Wang,&nbsp;Li Yang,&nbsp;Guangri Xu","doi":"10.1002/cnma.202500102","DOIUrl":"10.1002/cnma.202500102","url":null,"abstract":"<p>The Na<sub><i>x</i></sub>MnO<sub>2</sub> (<i>x</i> &lt; 0.44) material with a T-type tunnel phase shows excellent cycling performance, but low initial specific capacity. The Na<sub><i>x</i></sub>MnO<sub>2</sub> (<i>x</i> &gt; 0.6) with P2-type phase exhibits high initial specific capacity, yet poor cycling performance. Layer-tunnel hybrid materials has served as cathode materials for sodium-ion batteries (SIBs) due to the integration of high specific capacity and superior cycling performance. Herein, sodium manganite composites is synthesized with tunnel phase containing a small amount of P2-type layered phase in Na<sub>0.44</sub>MnO<sub>2</sub> materials using citric acid as the dispersant. The citric acid can promote the transition of the T-P2 phase and contribute to the uniform distribution of elements. The as-prepared Na<sub>0.44</sub>MnO<sub>2</sub> with layered-tunnel hybrid phase exhibits the best overall electrochemical performances with a capacity retention of 68% after 300 cycles at 1 C and an initial discharge capacity of 143.7 mA h g<sup>−1</sup>, due to combination of the advantages of layered and tunnel structure. This work provides a new strategy for synthesizing transition metal oxides with hybrid phase as the cathode of advanced SIBs.</p>","PeriodicalId":54339,"journal":{"name":"ChemNanoMat","volume":"11 7","pages":""},"PeriodicalIF":2.6,"publicationDate":"2025-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144598330","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Impact of Organic Precursors on the Optoelectronic Properties of As-Synthesized Carbon Dots 有机前驱体对as合成碳点光电性能的影响
IF 2.6 4区 材料科学
ChemNanoMat Pub Date : 2025-05-12 DOI: 10.1002/cnma.202500082
Ashwini Nawade, Kumar Babu Busi, Kunchanapalli Ramya, Sabyasachi Chakrabortty, Sabyasachi Mukhopadhyay
{"title":"Impact of Organic Precursors on the Optoelectronic Properties of As-Synthesized Carbon Dots","authors":"Ashwini Nawade,&nbsp;Kumar Babu Busi,&nbsp;Kunchanapalli Ramya,&nbsp;Sabyasachi Chakrabortty,&nbsp;Sabyasachi Mukhopadhyay","doi":"10.1002/cnma.202500082","DOIUrl":"10.1002/cnma.202500082","url":null,"abstract":"<p>Carbon dots (CDs), versatile carbon-based luminescent nanomaterials, offer environmental friendliness, cost-effectiveness, and tunable optical properties for diverse optoelectronic applications, including light-emitting diodes, photodetectors, and flexible electronics. These nanoscale materials exhibit unique optical behaviors like highly tunable photoluminescence and efficient multiphoton up-conversion. Herein, it explores how precursor selection influences CDs’ <i>sp</i><sup>2</sup>/<i>sp</i><sup>3</sup> hybridization ratios and their optoelectronic properties. CDs are synthesized from four distinct sources: polymeric polyvinylpyrrolidone, protein, biomass, and citric acid. Biomass- and protein-derived CDs display remarkable photocurrent enhancements under blue light, attributed to balanced <i>sp</i><sup>2</sup>/<i>sp</i><sup>3</sup> ratios, while polymer-derived CDs show limited optoelectronic response. These findings reveal the critical role of precursor composition in tailoring the structural and electronic properties of CDs, offering sustainable pathways for their application in advanced optoelectronic devices.</p>","PeriodicalId":54339,"journal":{"name":"ChemNanoMat","volume":"11 7","pages":""},"PeriodicalIF":2.6,"publicationDate":"2025-05-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144598284","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
High-Performance β-MnO2-Based Flexible and Binder-Free Asymmetric Supercapacitor 高性能β- mno2基柔性无粘结剂非对称超级电容器
IF 2.6 4区 材料科学
ChemNanoMat Pub Date : 2025-05-12 DOI: 10.1002/cnma.202500197
Sai Prem Shaji, Madeshwaran Mohanraj, Vanchiappan Aravindan, Mani Ulaganathan
{"title":"High-Performance β-MnO2-Based Flexible and Binder-Free Asymmetric Supercapacitor","authors":"Sai Prem Shaji,&nbsp;Madeshwaran Mohanraj,&nbsp;Vanchiappan Aravindan,&nbsp;Mani Ulaganathan","doi":"10.1002/cnma.202500197","DOIUrl":"10.1002/cnma.202500197","url":null,"abstract":"<p>Achieving high specific capacitance is a key objective in realizing high energy density supercapacitor. In this work, morphology-controlled β-MnO<sub>2</sub> spheres are synthesized using a simple co-precipitation process, and binder-free electrodes are prepared and employed in an asymmetric supercapacitor (ASC) fabrication. The as-prepared β-MnO<sub>2</sub> spheres showed an excellent specific capacitance of ≈394 F g<sup>−1</sup> at a current density of 0.37 A g<sup>−1</sup> in KOH electrolyte. Remarkably, β-MnO<sub>2</sub> spheres in KOH electrolytes showed highly improved performance than that of other electrolytes. Further, to ensure the practical viability of the as-prepared β-MnO<sub>2</sub>, β-MnO<sub>2</sub>||Activated Carbon (AC) ASC prototype is fabricated, and its supercapacitor properties are characterized. ASC device showed an excellent cycle life with capacitance retention and coulombic efficiency of 72 and &gt;95%, respectively, up to 10,000 cycles, indicating the good practical viability of the ASC in alkaline electrolytes. The ASC delivered a specific energy of 26.6 Wh kg<sup>−1</sup> at a specific power of 175 W kg<sup>−1</sup>; the maximum power-delivering ability is also evidenced by getting 4.55 kW kg<sup>−1</sup> at 7.55 Wh kg<sup>−1</sup>. Thus, the obtained unlocked specific capacitance of the morphology-controlled β-MnO<sub>2</sub> electrode will be considered as a potential candidate for ASC applications as a positive electrode in alkaline electrolyte.</p>","PeriodicalId":54339,"journal":{"name":"ChemNanoMat","volume":"11 8","pages":""},"PeriodicalIF":2.6,"publicationDate":"2025-05-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144905615","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Continuous Flow Assisted Synthesis of SnO2–CdS Nano-Heterostructures with Enhanced Oxygen and Sulfur Vacancies for Hypersensitive Electrochemical Determination of Metronidazole 连续流辅助合成具有增强氧和硫空位的SnO2-CdS纳米异质结构用于甲硝唑的超敏电化学测定
IF 2.6 4区 材料科学
ChemNanoMat Pub Date : 2025-05-11 DOI: 10.1002/cnma.202500048
Utsav Sengupta, Jit Satra, Muthaimanoj Periyasamy, Arik Kar
{"title":"Continuous Flow Assisted Synthesis of SnO2–CdS Nano-Heterostructures with Enhanced Oxygen and Sulfur Vacancies for Hypersensitive Electrochemical Determination of Metronidazole","authors":"Utsav Sengupta,&nbsp;Jit Satra,&nbsp;Muthaimanoj Periyasamy,&nbsp;Arik Kar","doi":"10.1002/cnma.202500048","DOIUrl":"10.1002/cnma.202500048","url":null,"abstract":"<p>Aquatic pollution from pharmaceutical residues, particularly non-steroidal anti-inflammatory drugs (NSAIDs), poses serious ecological risks. Real-time monitoring of these pollutants is crucial for environmental sustainability. This study presents a highly sensitive electrochemical sensor based on ultrasmall SnO<sub>2</sub>–CdS heterostructured semiconductor nanocomposite for detecting the antibiotic metronidazole (MNZ), a NSAID. The sensor was developed via a simple and efficient continuous flow microreactor technology at a realistically low reaction temperature and exceptionally short period. Compared to individual SnO<sub>2</sub> and CdS, the heterostructure demonstrated superior electrocatalytic performance, attributed to the formation of oxygen and sulfur vacancies at the junction, enhancing diffusion and electro-reduction of the analyte. The outstanding performance of the sensor might also be related to the formation of a heterojunction between SnO<sub>2</sub> and CdS semiconductors, which led to improved electron conduction efficiency through the hybrid electronic structure. The sensor exhibited high sensitivity (0.7044 µA µM<sup>−1</sup> cm<sup>−2</sup>), excellent selectivity, a low detection limit (0.0008 µM), a wide linear range (0.01-1500 µM), and strong long-term stability. Its practical potential was confirmed through successful detection of MNZ in real samples like lake water and human urine.</p>","PeriodicalId":54339,"journal":{"name":"ChemNanoMat","volume":"11 6","pages":""},"PeriodicalIF":2.6,"publicationDate":"2025-05-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144256288","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Microwave-Assisted Synthesis of Nickel Sulfide/Iron Sulfide (NiS2/Fe7S8) Rods for Oxygen Evolution Reaction 微波辅助合成出氧反应用硫化镍/硫化铁(NiS2/Fe7S8)棒
IF 2.6 4区 材料科学
ChemNanoMat Pub Date : 2025-05-10 DOI: 10.1002/cnma.202500001
Shraddhanjali Senapati, Rajaram Bal, Bijayalaxmi Jena
{"title":"Microwave-Assisted Synthesis of Nickel Sulfide/Iron Sulfide (NiS2/Fe7S8) Rods for Oxygen Evolution Reaction","authors":"Shraddhanjali Senapati,&nbsp;Rajaram Bal,&nbsp;Bijayalaxmi Jena","doi":"10.1002/cnma.202500001","DOIUrl":"10.1002/cnma.202500001","url":null,"abstract":"<p>Generation of hydrogen fuel from renewable sources like water via electrolysis is an effective process to produce it. For this process an efficient, inexpensive, and durable electrocatalyst is required for splitting of water molecules. Herein, a rod-shaped nickel sulfide/iron sulfide (NiS<sub>2</sub>/Fe<sub>7</sub>S<sub>8</sub>) electrocatalyst is fabricated for the water splitting reaction by the microwave method. NiS<sub>2</sub>/Fe<sub>7</sub>S<sub>8</sub> exhibits a very low overpotential of 250 and 300 mV at current densities of 25 mA cm<sup>−2</sup> (<i>η</i><sub>25</sub>) and 40 mA cm<sup>−2</sup> (<i>η</i><sub>40</sub>), respectively, and a Tafel slope value of 26 mV dec<sup>−1</sup> for oxygen evolution reaction in a basic electrolyte. It shows electrochemical stability of 45 h with low impedance and high electrochemical surface area.</p>","PeriodicalId":54339,"journal":{"name":"ChemNanoMat","volume":"11 7","pages":""},"PeriodicalIF":2.6,"publicationDate":"2025-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144598254","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Preparation of Lignocellulosic Nanofibrils Directly from Corn Straw Applied for the Stabilization of Pickering Emulsions 直接从玉米秸秆中制备木质纤维素纳米原纤维用于酸洗乳的稳定
IF 2.6 4区 材料科学
ChemNanoMat Pub Date : 2025-05-09 DOI: 10.1002/cnma.202500098
Xuhai Zhu, Ruizhe Li, Yangbing Wen, Yuzhe Jin, Rongjun Lin, Rui Lu, Fang Lu
{"title":"Preparation of Lignocellulosic Nanofibrils Directly from Corn Straw Applied for the Stabilization of Pickering Emulsions","authors":"Xuhai Zhu,&nbsp;Ruizhe Li,&nbsp;Yangbing Wen,&nbsp;Yuzhe Jin,&nbsp;Rongjun Lin,&nbsp;Rui Lu,&nbsp;Fang Lu","doi":"10.1002/cnma.202500098","DOIUrl":"10.1002/cnma.202500098","url":null,"abstract":"<p>This study proposes a straightforward, cost-effective, and environmentally benign approach for the pretreatment of corn straw using alkaline cationization, followed by mechanical defibrillation to yield lignocellulosic nanofibrils (LCNF) as stabilizers of Pickering emulsions. Two distinct types of LCNFs (designated as LCNF-0.07 and LCNF-0.14) are obtained and characterized by a range of techniques. The charge density of these LCNFs is found to be 0.07 and 0.14 meq g<sup>−1</sup>, respectively. The findings demonstrate that continuous alkaline cationic pretreatment can effectively remove most hemicelluloses and lignin, thereby loosening the structure of the fiber cell wall and facilitating the subsequent nanofibrillation of the resulting cellulose-rich solid (lignocellulose). The diameters of individual LCNFs are typically in the range of 20–30 nm, exhibiting high aspect ratios, a fine web-like structure, high dispersion stability, and good thermal stability. Under optimal conditions, long-term emulsion stabilization is achieved with LCNF-0.14 at concentrations as low as 0.7 wt% and with a low oil fraction of up to 10%. This can be attributed to the Pickering stabilization achieved by irreversible adsorption of the LCNF at the oil–water interface (as evidenced by fluorescent microscopy) and subsequent formation of an interdroplet LCNF network in the continuous phase (as verified by scanning electron microscope images).</p>","PeriodicalId":54339,"journal":{"name":"ChemNanoMat","volume":"11 6","pages":""},"PeriodicalIF":2.6,"publicationDate":"2025-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144256309","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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