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/Cu_(2)O-NC catalyst with excellent ORR performance and high stability,due to the synergistic effect of Cu and Cu_(2)O nanoparticles.The half-wave potential(0.8 V) and the limiting-current density(5.20 mA/cm^(2)) of the Cu/Cu_(2)O-NC are very close to those of the 20% Pt/C catalyst(0.82 V,5.10 mA/cm^(2)).Besides,it exhibits excellent performance with a maximal power density of 250 mW/cm^(2) and a stable continuous discharge for more than 90 h in the Al-air battery test The promoting effects of Cu_(2)O towards Cu-based ORR catalysts are illustrated as follows:(ⅰ) Cu_(2)O 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 Cu_(2)O 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.
基金
financially supported by the National Key R&D Program of China (No.2019YFA0210300)
National Nature Science Foundation of China (No.21671200)
Hunan Provincial Science and Technology Plan Project of China (Nos.2017TP1001,2018RS3009 and 2019GK2033)
financial support from The Open Project Program of Key Laboratory of Preparation and Application of Environmental Friendly Materials (No.2019006),Ministry of Education。
