Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 6, Issue 22, Pages 10243-10252Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8ta02608d
Keywords
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Funding
- Fundamental Research Funds for the Central Universities [106112017CDJXSYY0001, 106112016CDJZR325520]
- National Natural Science Foundation of China [21503025, 21576034]
- Venture & Innovation Support Program for Chongqing Overseas Returnees [cx2017060]
- Chongqing Research Program of Basic Research and Frontier Technology [cstc2016jcyjA1059]
- Hundred Talents Program at Chongqing University
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Rechargeable zinc-air (Zn-air) batteries having high theoretical energy density are the most attractive energy technologies for future electric vehicles and flexible/wearable electronics. However, the serious lack of highly efficient and cost-effective oxygen electrocatalysts is one of the major obstacles for their future commercialization. Herein, we presented a core/shell design based on porous NiCo2O4 nanowires and ultrathin NiMn LDH nanosheets as an efficient method for the synthesis of electrocatalysts for rechargeable Zn-air batteries. Due to the large active surface area, rapid mass/charge transport, and high electron conductivity as well as unique structures, the core/shell NiCo2O4@NiMn LDH materials could deliver a rather low OER overpotential of 255 mV at 10.0 mA cm(-2) while maintaining good stability in alkaline media. When these materials were further employed as air-cathode materials for Zn-air batteries, they exhibited an ultrahigh energy density (866 W h kg(-1)), superior reversibility (initial round-trip efficiency of 63.5%) and excellent stability (voltage gap increased by only about 20 mV after 500 cycles), which were much better than those of commercial Ir/C catalyst. Furthermore, the as-prepared flexible solid Zn-air battery also displayed very good mechanical properties, long cycle life and outstanding round-trip efficiency (70-74%).
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