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Electrochemical activation techniques and the use of multi-shell structured materials are effective strategies to enhance the electrochemical performance of rechargeable aqueous zinc-ion capacitors (ZICs). In this study, we successfully synthesized spherical NiMn-MOFs a solvothermal method and used them as templates to prepare Ni/MnO@C nanospheres with different core-shell structures by adjusting the heating rate under an Ar atmosphere. The multi-shelled structure provides more active sites and alleviates structural strain associated with repeated Zn insertion/extraction processes. During the initial charge process, the Ni/MnO@C cathode undergoes electrochemical activation and generates oxygen vacancies, which can facilitate Zn adsorption and promote ion diffusion, significantly enhancing its initial capacity and cycling stability. The activated Ni/MnO@C electrode exhibits an excellent capacity of 500 mA h g at a current density of 0.3 A g, and the capacity retention rate remains as high as 90.9% even after 5200 cycles at 3 A g. The assembled AC//Ni/MnO@C (AC: active carbon) ZIC demonstrates an energy density of 90.14 W h kg at a power density of 2750.17 W kg. At 3 A g, the capacity retention rate remains as high as 80.3% after 6000 cycles, indicating excellent long-term durability. This work provides a promising strategy for designing high-performance cathodes for the next generation of ZICs.
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http://dx.doi.org/10.1039/d4dt02303j | DOI Listing |
Angew Chem Int Ed Engl
December 2024
Tsinghua University, Zhongguancun North Street, Haidian District, 100084, BEIJING, CHINA.
The rational design of metal oxide catalysts with enhanced oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) performance is crucial for the practical application of aqueous rechargeable zinc-air batteries (a-r-ZABs). Precisely regulating the electronic environment of metal-oxygen (M-O) active species is critical yet challenging for improving their activity and stability toward OER and ORR. Herein, we propose an atomic-level bilateral regulation strategy by introducing atomically dispersed Ga for continuously tuning the electronic environment of Ru-O and Mn-O in the Ga/MnRuO2 catalyst.
View Article and Find Full Text PDFSmall
December 2024
State Key Laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, Jiangsu, 210023, P. R. China.
Small molecule electrode materials with superb redox activity have significant applied implications for K-ion storage, but they face significant challenges like high solubility in electrolytes and low conductivity, limiting their capacity, rate, and cycling stability. Herein, a series of Ni-bis(dithiolene) (NiS)-based small molecules are designed with control of various redox-active substitutional groups for K-ion batteries anode materials. It is identified that bis[1,2-di(pyridine-4-yl) ethylene-1,2-dithiolate] nickel Ni[CSPy] demonstrates a high reversible specific capacity (399 mAh g at 0.
View Article and Find Full Text PDFJ Colloid Interface Sci
December 2024
Electric Mobility and Tribology Research Group, Council of Scientific and Industrial Research Central Mechanical Engineering Research Institute, Mahatma Gandhi Avenue, Durgapur 713209, West Bengal, India; Academy of Scientific and Innovative Research (AcSIR), CSIR-Human Resource Development Centre (CSIR-HRDC) Campus, Postal Staff College Area, Sector 19, Kamla Nehru Nagar, Ghaziabad 201002, Uttar Pradesh, India. Electronic address:
Rechargeable zinc-air batteries (ZABs) with high-performance and stability is desirable for encouraging the transition of the technology from academia to industries. However, achieving this balance remains a formidable challenge, primarily due to the requirement of robust, earth-abundant reversible oxygen electrocatalyst. The present study introduces a simple strategy to synthesize Co-N rich nanoalloy with N-doped porous carbon tubes (NiCo@NPCTs).
View Article and Find Full Text PDFJ Colloid Interface Sci
December 2024
College of Urban and Environmental Sciences, Huangshi Key Laboratory of Prevention and Control of Soil Pollution, Hubei Normal University, Huangshi 435002, PR China. Electronic address:
The development of carbon-encapsulated alloy catalysts, through a rational design that integrates highly active Me-N-C sites, is essential for improving the reaction kinetics of both oxygen reduction (ORR) and oxygen evolution reactions (OER). This advancement is pivotal for the progression of efficient rechargeable zinc-air batteries (RZABs). In this study, we investigates a CoNi alloy decorated N-doped carbon nanotube (CoNi-NCNT) electrocatalyst using a dual-ligand strategy.
View Article and Find Full Text PDFJ Am Chem Soc
December 2024
School of Materials Science and Engineering, Department of Chemical Engineering, Shanghai Jiao Tong University, Shanghai 200240, P. R. China.
Sulfurized polyacrylonitrile (SPAN) has emerged as a highly promising cathode material for next-generation lithium-sulfur (Li-S) batteries primarily due to its non-polysulfide dissolution and excellent cycle stability. Nevertheless, the specific roles and impacts of the pyrolyzed polyacrylonitrile, which constitutes the polymer backbone of SPAN, remain inadequately understood. In this study, comprehensive investigations from multiple aspects, including electrochemistry, spectroscopy, electron microscopy, and theoretical calculations, were conducted on a series of SPAN materials with various sulfur contents.
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