【摘 要】
：
Developing high-efficiency,inexpensive,and steady non-precious metal oxygen reduction reaction(ORR) catalysts to displace Pt-based catalysts is significant for commercial applications of Al-air battery.Here,we have prepared the Cu/Cu2O-NC catalyst with ex
【机 构】
：
Hunan Provincial Key Laboratory of Chemical Power Sources,College of Chemistry and Chemical Engineer
论文部分内容阅读
Developing high-efficiency,inexpensive,and steady non-precious metal oxygen reduction reaction(ORR) catalysts to displace Pt-based catalysts is significant for commercial applications of Al-air battery.Here,we have prepared the Cu/Cu2O-NC catalyst with excellent ORR performance and high stability,due to the synergistic effect of Cu and Cu2O nanoparticles.The half-wave potential (0.8 V) and the limiting-current density (5.20 mA/cm2) of the Cu/Cu2O-NC are very close to those of the 20％ Pt/C catalyst (0.82 V,5.10 mA/cm2).Besides,it exhibits excellent performance with a maximal power density of 250 mW/cm2 and a stable continuous discharge for more than 90 h in the Al-air battery test.The promoting effects of Cu2O towards Cu-based ORR catalysts are illustrated as follows:(i) Cu2O is the major ORR active site by the redox of Cu(Ⅱ)/Cu(Ⅰ),which provides excellent ORR activities;(ii) Cu can stabilize the location of Cu2O by assisting the electron transfer to Cu(Ⅱ)/Cu(Ⅰ) redox,which is conducive to the high stability of the catalyst.This work provides a useful strategy for enhancing the ORR performance of Cu-based catalysts.
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