Small最新文献_第4页

Gelatin-Induced Synthesis of Strain-Engineered Spherical Cu2O Nanoparticles for Efficient Nitrate Reduction to Ammonia

IF 13.3 2区材料科学

Small Pub Date : 2025-01-29 DOI: 10.1002/smll.202411005

Ji Li, Kai Wu, Jing Heng, Lintao Zhu, Xuechuan Wang, Qingxin Han, Taotao Qiang

{"title":"Gelatin-Induced Synthesis of Strain-Engineered Spherical Cu2O Nanoparticles for Efficient Nitrate Reduction to Ammonia","authors":"Ji Li, Kai Wu, Jing Heng, Lintao Zhu, Xuechuan Wang, Qingxin Han, Taotao Qiang","doi":"10.1002/smll.202411005","DOIUrl":"https://doi.org/10.1002/smll.202411005","url":null,"abstract":"The electrochemical reduction of nitrate to ammonia offers an environmentally sustainable pathway for nitrogen fixation. However, achieving both efficiency and selectivity in nitrate reduction presents a formidable challenge, due to the involvement of sluggish multielectron transfer processes. Herein, the successful synthesis of spherical Cu₂O nanoparticles (s-Cu₂O) exhibiting significant compressive strain effects, achieved through a one-pot method using gelatin as a structural modifier, is reported. The s-Cu₂O catalyst demonstrates exceptional electrochemical performance for nitrate reduction reaction (NO3RR), achieving a Faradaic efficiency (FENH3) of 95.07%, ammonia selectivity of 92.03%, a nitrate conversion rate of 97.77%, and a yield rate of 284.83 µmol h⁻¹ cm⁻2 at −0.8 V versus reversible hydrogen electrode (vs. RHE) for ammonia production. Structural characterization and density functional theory calculations reveal that compressive strain plays a critical role in modulating the electronic structure of the catalyst, thereby activating the *NO intermediate in the potential determining step and effectively suppressing the hydrogen evolution reaction. Furthermore, it is implemented in a Zn-NO3− battery, and the test results indicate that the battery achieved a peak power density of 3.95 mW cm−2 at a potential of 0.129 V (vs Zn/Zn2⁺), illustrating its excellent electrochemical and functional efficacy. This work introduces a novel strategy for the rational design of high-performance electrocatalysts through strain engineering, offering broad implications for energy-efficient ammonia synthesis, and sustainable nitrogen cycling.","PeriodicalId":228,"journal":{"name":"Small","volume":"25 1","pages":""},"PeriodicalIF":13.3,"publicationDate":"2025-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143056394","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Exploring Green Pyrotechnic Formulations and Primary Explosives with 1,3,4-Oxadiazole-Based Micro and Submicron Energetic Coordination Polymers

IF 13.3 2区材料科学

Small Pub Date : 2025-01-29 DOI: 10.1002/smll.202409255

Shreyasi Banik, Richa Rajak, Jean'ne M. Shreeve, Srinivas Dharavath

{"title":"Exploring Green Pyrotechnic Formulations and Primary Explosives with 1,3,4-Oxadiazole-Based Micro and Submicron Energetic Coordination Polymers","authors":"Shreyasi Banik, Richa Rajak, Jean'ne M. Shreeve, Srinivas Dharavath","doi":"10.1002/smll.202409255","DOIUrl":"https://doi.org/10.1002/smll.202409255","url":null,"abstract":"Alkali and alkaline-earth metal incorporated 5,5′-dinitramino-3,3′-azo-1,3,4-oxadiazole (H2DNAO) based Energetic Coordination Polymers (ECPs), namely dipotassium 5,5′-dinitramino-3,3′-azo-1,3,4-oxadiazole(K2DNAO), dicesium 5,5′-dinitramino-3,3′-azo-1,3,4-oxadiazole(Cs2DNAO) and barium 5,5′-dinitramino-3,3′-azo-1,3,4-oxadiazole(BaDNAO) are synthesized for the first time. Synthesized ECPs are thoroughly characterized using infrared spectroscopy (IR), elemental analysis (EA), thermogravimetric analysis and differential scanning calorimetry (TGA-DSC), field emission scanning electron microscopy (FE-SEM), and dynamic light scattering (DLS), UV–vis spectroscopy. All ECPs are also confirmed by single-crystal X-ray diffraction technique (SC-XRD). The micro-ECPs exhibit excellent densities (1.98–2.80 g cm−3), insensitivities (IS: 25-40 J; FS: 240-360 N), and good thermal stabilities (Td: 182–212 °C). K2DNAO and Cs2DNAO show good detonation performance (VOD:7460-7893 m s−1; DP: 27.5-30.6 GPa), respectively. To further investigate sub-micron-energetics, three sub-micron ECPs are prepared from their micro counterparts using ultrasonication method, demonstrating significant improvement in thermal stability (Td: 194–221 °C) but are highly sensitivity (IS: 2-15J; FS: 40-360N). Burning tests of two experimental formulations using micro K2DNAO and Cs2DNAO demonstrate their potential in green pyrotechnic applications. Interestingly, the submicron-counterparts show remarkable initiating capability. Considering their ease of synthesis, and safety profile, these materials can be effectively transported in their microform and can be rapidly converted into submicron-form on demand, making them suitable for pyrotechnic applications.","PeriodicalId":228,"journal":{"name":"Small","volume":"10 1","pages":""},"PeriodicalIF":13.3,"publicationDate":"2025-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143057224","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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-Efficiency Y6 Homojunction Organic Solar Cells Enabled by a Secondary Hole Transport Layer

IF 13.3 2区材料科学

Small Pub Date : 2025-01-29 DOI: 10.1002/smll.202409485

Shaun McAnally, Eucalyptus Brooks, Oliver Lindsay, Paul L. Burn, Ian R. Gentle, Paul E. Shaw

{"title":"High-Efficiency Y6 Homojunction Organic Solar Cells Enabled by a Secondary Hole Transport Layer","authors":"Shaun McAnally, Eucalyptus Brooks, Oliver Lindsay, Paul L. Burn, Ian R. Gentle, Paul E. Shaw","doi":"10.1002/smll.202409485","DOIUrl":"https://doi.org/10.1002/smll.202409485","url":null,"abstract":"Y6 homojunction solar cells are prepared using the exciton/electron-blocking material poly[9,9-di-n-octylfluorene-alt-N-(4-sec-butylphenyl)diphenylamine] (TFB) as a secondary hole transport layer material in conjunction with PEDOT:PSS. Using this device architecture, a maximum power conversion efficiency (PCE) of 2.57% is achieved, which is the highest reported thus far for a solution-processed small molecule homojunction organic photovoltaic (OPV) device. The devices display an unexpectedly low thickness dependence, with the average PCE only decreasing by ≈17% when the Y6 active layer thickness is increased from 80 to 300 nm. Time-resolved photoluminescence measurements show that the TFB does not contribute to charge generation through photoinduced hole or electron transfer. However, transient absorption spectroscopy on thin films of neat Y6 and a 1:1 blend of Y6:TFB shows that the TFB enhances the formation of the long-lived Y6 intermolecular charge-transfer state in the blend film. It is found that careful selection of the electron transport layer (ETL) is required to avoid unintended charge generation at the interface with Y6 so as to ensure that the device is a true homojunction. The improved efficiency of this architecture is attributed to the electron-blocking and hole-extraction effects of the TFB layer.","PeriodicalId":228,"journal":{"name":"Small","volume":"22 1","pages":""},"PeriodicalIF":13.3,"publicationDate":"2025-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143057267","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Triggered “On/off” Luminescent Polypeptide Bowl-Shaped Nanoparticles for Selective Lighting of Tumor Cells

IF 13.3 2区材料科学

Small Pub Date : 2025-01-29 DOI: 10.1002/smll.202411432

Yaning Gao, Yin Wang, Jinhui Jiang, Ping Wei, Hui Sun

{"title":"Triggered “On/off” Luminescent Polypeptide Bowl-Shaped Nanoparticles for Selective Lighting of Tumor Cells","authors":"Yaning Gao, Yin Wang, Jinhui Jiang, Ping Wei, Hui Sun","doi":"10.1002/smll.202411432","DOIUrl":"https://doi.org/10.1002/smll.202411432","url":null,"abstract":"Functional polymeric nanoparticles, especially those with anisotropic structures, have shown significant potential and advantages in biomedical applications including detecting, bioimaging, antimicrobial and anticancer. Herein, tetraphenylethylene (TPE) and azobenzene modified polypeptides of poly((L-glutamic acid) tetraphenylethylene-stat-(L-glutamic acid)) (P(GATPE9-stat-GA25)) and poly((L-glutamic acid) azobenzene-stat-(L-glutamic acid)) (P(GAAzo5-stat-GA29) are synthesized, which self-assemble into bowl-shaped nanoparticles (BNPs) with controlled diameter, opening size and fluorescent property individually, or by co-assembly. Due to the quenching effect of azobenzene, the fluorescence of the coassembled BNPs is completely inhibited. Upon incubated under reduction environment, the fluorescence of the BNPs is re-excited owing to the reduction or break of azo bonds. Benefiting from the high-level azo reductase in hypoxic liver cancer cells comparing to normal liver cells, the quenched BNPs exhibit pronounced fluorescence signal in human hepatoma (HepG2) cells under hypoxic condition, demonstrating the high efficiency of the reduction-responsive luminescent BNPs for selective screening of tumor cells. In addition, it is also found that a proper opening size promotes the cellular uptake of the BNPs even with size up to micron. Overall, this study provides a fresh perspective in the controlled preparation of anisotropic polymeric nanoparticles and high efficient cancer cell screening.","PeriodicalId":228,"journal":{"name":"Small","volume":"79 1","pages":""},"PeriodicalIF":13.3,"publicationDate":"2025-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143057266","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Unraveling Various Sources of Particulates Matter in Air-Dust Samples Collected from North India Through Elemental Mapping and Concentration Correlation Using Micro-Particle-Induced X-Ray Emission Spectroscopy

IF 13.3 2区材料科学

Small Pub Date : 2025-01-29 DOI: 10.1002/smll.202409264

Darshpreet Kaur Saini, Todd A. Byers, Shivcharan Verma, Mohin Sharma, Mritunjaya Parashar, Charles T. Bowen, Biraja Mohanty, Gary A. Glass, Bibhudutta Rout

{"title":"Unraveling Various Sources of Particulates Matter in Air-Dust Samples Collected from North India Through Elemental Mapping and Concentration Correlation Using Micro-Particle-Induced X-Ray Emission Spectroscopy","authors":"Darshpreet Kaur Saini, Todd A. Byers, Shivcharan Verma, Mohin Sharma, Mritunjaya Parashar, Charles T. Bowen, Biraja Mohanty, Gary A. Glass, Bibhudutta Rout","doi":"10.1002/smll.202409264","DOIUrl":"https://doi.org/10.1002/smll.202409264","url":null,"abstract":"Particulate matter (PM) found in the air is one of the major sources of pollution and air-borne diseases. Therefore, it is imperative to examine the elemental concentration distribution of the PM to identify the pollutant sources. In this study, it has demonstrated the capabilities of micro-particle-induced X-ray emission (micro-PIXE) spectroscopy in quantitative analysis of air samples collected from the Old Delhi outdoor market and indoor locations in the Panjab University hostel in the winter months. A 2-million electronvolts energetic scanning proton micro-beam (diameter ≈1 µm2) is used in micro-PIXE experiments generating high-resolution elemental maps of different regions of interest (ROI). Micro-PIXE along with the GeoPIXE analysis provides a non-destructive, standard-less, and ng/mg level-sensitive tool for the investigation of elemental distributions and highlighting pixels, which correlates to specific concentration ratios between elements at ROIs, thereby enabling a comprehensive understanding of the source of each elemental particulate. Si, Ca, and K detected in indoor PM suggest the source to soil erosion and crop burning, while high S levels in outdoor PM are primarily associated with coal power plants. Additionally, Sc, Ti, Cr, Mn, and Zn are found in outdoor samples, while indoor locations also contained trace amounts of V, Co, and Cu.","PeriodicalId":228,"journal":{"name":"Small","volume":"49 1","pages":""},"PeriodicalIF":13.3,"publicationDate":"2025-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143057269","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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-Entropy Oxychalcogenide for Hydrogen Spillover Enhanced Hydrogen Evolution Reaction in Proton and Anion Exchange Membrane Water Electrolyzers

IF 13.3 2区材料科学

Small Pub Date : 2025-01-29 DOI: 10.1002/smll.202411883

Seunghwan Jo, Ki Hoon Shin, Eunmin Kim, Jung Inn Sohn

{"title":"High-Entropy Oxychalcogenide for Hydrogen Spillover Enhanced Hydrogen Evolution Reaction in Proton and Anion Exchange Membrane Water Electrolyzers","authors":"Seunghwan Jo, Ki Hoon Shin, Eunmin Kim, Jung Inn Sohn","doi":"10.1002/smll.202411883","DOIUrl":"https://doi.org/10.1002/smll.202411883","url":null,"abstract":"The hydrogen spillover phenomenon provides an expeditious reaction pathway via hydrogen transfer from a strong H adsorption site to a weak H adsorption site, enabling a cost-efficient hydrogen evolution reaction (HER) analogous to platinum with moderate H adsorption energy. Here, a high-entropy oxychalcogenide (HEOC) comprising Co, Ni, Mo, W, O, Se, and Te is prepared by a two-step electrochemical deposition for hydrogen spillover-enhanced HER in acidic and alkaline water electrolysis. The anodic–cathodic reversal current enables the co-deposition of cations and aliovalent anions, facilitating a glass structure with multiple active sites for hydrogen spillover. The HEOC exhibits low overpotentials of 52 and 57 mV to obtain a current density of 10 mA cm−2 in acidic and alkaline media, respectively, and long-term stability for 500 h. The electrochemical and analytical approaches elucidate the hydrogen transfer toward Mo/W−O sites in both acid and alkaline HERs. Meanwhile, the other sites act as hydrogen adsorption or water dissociation-derived hydroxide adsorption sites, showing accommodable behavior in acidic and alkaline media. The HEOC exhibits a practically high current of 1 A cm−2 at cell voltages of 1.78 and 1.89 V and long-term stability for 100 h in proton and anion exchange membrane water electrolyzers, respectively.","PeriodicalId":228,"journal":{"name":"Small","volume":"147 1","pages":""},"PeriodicalIF":13.3,"publicationDate":"2025-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143056396","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Multiscale Collaborative Optimization for Composite Solid Electrolyte to Achieve High-Performance Lithium Metal Batteries

IF 13.3 2区材料科学

Small Pub Date : 2025-01-29 DOI: 10.1002/smll.202412054

Xinyu Li, Xueying Yang, Ruiyang Li, Pengbin Lai, Minghui Chen, Wei Li, Qichen Chen, Yi Deng, Peng Zhang, Jinbao Zhao

{"title":"Multiscale Collaborative Optimization for Composite Solid Electrolyte to Achieve High-Performance Lithium Metal Batteries","authors":"Xinyu Li, Xueying Yang, Ruiyang Li, Pengbin Lai, Minghui Chen, Wei Li, Qichen Chen, Yi Deng, Peng Zhang, Jinbao Zhao","doi":"10.1002/smll.202412054","DOIUrl":"https://doi.org/10.1002/smll.202412054","url":null,"abstract":"Composite solid electrolytes (CSEs) possess significant advantages over individual polymer or inorganic solid electrolytes. However, conventional CSEs suffer from multiple scale issues, including interruptions in ionic transport pathways, incompatibility at heterogeneous interface, and the excessive thickness of electrolytes. Herein, a novel CSE with ultrathin structure (22 µm) based on the strategy of multiscale collaborative optimization (MC-CSE) is designed. This strategy involves continuous, rapid, and homogeneous Li+ transport from macroscale to microscale. i) The bicontinuous structure of MC-CSE is constructed via in situ polymerization of 1,3-dioxolane in a continuous yet porous Li6.4La3Zr1.4Ta0.6O12 (CP-LLZTO) skeleton, which effectively reduces the barrier for Li⁺ transport at macroscale. ii) The continuous interconnected CP-LLZTO and poly 1,3-dioxolane (PDOL) phases within MC-CSE ensures continuous Li+ transport at mesoscale. iii) CP-LLZTO and PDOL synergistic interaction at heterogeneous interface, which facilitates the rapid and homogeneous Li+ transport at microscale. Consequently, the MC-CSE shows both high ionic conductivity and Li⁺ transference number (1.04 mS cm−1 and 0.87). The cells assembled with MC-CSE exhibit outstanding low-temperature (−20 °C) and high-voltage (4.5 V) performance. The strategy of multiscale collaborative optimization provides a promising perspective for the viability of lithium metal batteries at various conditions.","PeriodicalId":228,"journal":{"name":"Small","volume":"48 1","pages":""},"PeriodicalIF":13.3,"publicationDate":"2025-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143056680","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Intrinsically Stretchable Motion Sensor Enabled by 3D Graphene Foam Integrated Hydrogel

IF 13.3 2区材料科学

Small Pub Date : 2025-01-29 DOI: 10.1002/smll.202407957

Wei Sheng, Jianxin Zhou, Yuxi Jia, Wentao Li, Ruixi Qiao, Zixi Liu, Wenjie Xu, Tao Zhang

引用次数: 0

Surface Engineered MoS2-Based Novel Vertical Triboelectric Nanogenerator (V-TENG) for Wireless Information Processing

IF 13.3 2区材料科学

Small Pub Date : 2025-01-29 DOI: 10.1002/smll.202410608

Mukul Biswas, Didhiti Bhattacharya, Rahul Mondal, Ritamay Bhunia, Ashish Garg, Avijit Chowdhury

{"title":"Surface Engineered MoS2-Based Novel Vertical Triboelectric Nanogenerator (V-TENG) for Wireless Information Processing","authors":"Mukul Biswas, Didhiti Bhattacharya, Rahul Mondal, Ritamay Bhunia, Ashish Garg, Avijit Chowdhury","doi":"10.1002/smll.202410608","DOIUrl":"https://doi.org/10.1002/smll.202410608","url":null,"abstract":"Self-sustaining mechanical energy harvesting devices are pivotal for developing durable energy-efficient systems, providing scalable and adaptable solutions to wearable technology. Triboelectric nanogenerators (TENGs) efficaciously convert ambient mechanical energy into usable electrical power to sustainably drive modern electronics. Surface and structural engineering is an avenue to boost TENGs’ energy harvesting through modulating contact interfaces and charge transfer interactions between the constituent layers. This study explores dielectric engineering incorporating an additional transition layer, such as Polyethylene Terephthalate (PET), alongside kapton to store accumulated charges. The surface of molybdenum sulfide (MoS2) is modified with different aromatic carboxylic acids to boost the vertical TENG's performance. The anchoring of aromatic carboxylic acid [4,4′-Oxybis (Benzoic acid)] modifies the work function and surface charge density of MoS2-based TENG and enhances the output performance. The output open-circuit voltage (VOC) and short-circuit current (ISC) for “PET-Kapton@4,4′-MoS2” TENG increase from 6 to 30 V and 65 to 202nA, respectively. The maximum power density obtained after inserting the transition layer and modifying the MoS2 surface is 399 mW m−2. The “PET-Kapton@4,4′-MoS2” TENG can power up to 6 LEDs, run a calculator, and generate International Morse code. A microcontroller unit successfully decodes the Morse code and transmits it wirelessly to a smartphone via Wi-Fi.","PeriodicalId":228,"journal":{"name":"Small","volume":"65 1","pages":""},"PeriodicalIF":13.3,"publicationDate":"2025-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143057264","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Synergy of Pyridinic-N and Co Single Atom Sites for Enhanced Oxygen Redox Reactions in High-Performance Zinc-Air Batteries

IF 13.3 2区材料科学

Small Pub Date : 2025-01-29 DOI: 10.1002/smll.202411574

Saeed Askari, Swarit Dwivedi, Masood S. Alivand, Kang Hui Lim, Parisa Biniaz, Ali Zavabeti, Sibudjing Kawi, Matthew R Hill, Adri C.T. van Duin, Akshat Tanksale, Mainak Majumder, Parama Chakraborty Banerjee

{"title":"Synergy of Pyridinic-N and Co Single Atom Sites for Enhanced Oxygen Redox Reactions in High-Performance Zinc-Air Batteries","authors":"Saeed Askari, Swarit Dwivedi, Masood S. Alivand, Kang Hui Lim, Parisa Biniaz, Ali Zavabeti, Sibudjing Kawi, Matthew R Hill, Adri C.T. van Duin, Akshat Tanksale, Mainak Majumder, Parama Chakraborty Banerjee","doi":"10.1002/smll.202411574","DOIUrl":"https://doi.org/10.1002/smll.202411574","url":null,"abstract":"Cobalt single-atom catalysts (SACs) have the potential to act as bi-functional electrocatalysts for the oxygen-redox reactions in metal-air batteries. However, achieving both high performance and stability in these SACs has been challenging. Here, a novel and facile synthesis method is used to create cobalt-doped-nitrogen-carbon structures (Co-N-C) containing cobalt-SACs by carbonizing a modified ZIF-11. HAADF-STEM images and EXAFS spectra confirmed that the structure with the lowest cobalt concentration contains single cobalt atoms coordinated with four nitrogen atoms (Co-N₄). Electrochemical tests showed that this electrocatalyst performed exceptionally well in both oxygen reduction reaction (ORR) (E1/2 ≈ 0.859 V) and oxygen evolution reaction (OER) (Ej = 10: 1.544 V), with excellent stability. When used as a bi-functional electrocatalyst in the air cathode of a rechargeable zinc-air battery (ZAB), a peak power density of 178.6.1 mW cm−2, a specific capacity of 799 mA h gZn−1 and a cycle-life of 1580 is achieved. Density functional theory (DFT) calculations revealed that the concentration and the position of the pyridinic nitrogen with Co play a critical role in determining the overpotential of this electrocatalyst for oxygen-redox reactions. The unprecedented performance of this electrocatalyst can bring paradigm changes in the practical realization and application of metal-air batteries.","PeriodicalId":228,"journal":{"name":"Small","volume":"27 1","pages":""},"PeriodicalIF":13.3,"publicationDate":"2025-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143057270","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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