Preparation and electrocatalytic performance of Ag@Cu2+1O/MWNTs catalysts towards oxygen reoxygen reduction catalyst for aluminum-air battery
YIN Liankun, ZHANG Yansong, YU Jiaxin, LUO Zhihong
Guangxi Key Laboratory of Optical and Electronic Materials and Devices, College of Materials Science and Engineering, Guilin University of Technology, Guilin 541004, China
Abstract：Ag@Cu2+1O/MWNTs catalysts were prepared by one-step method with THPC as reducing agent and MWNTs as support. The structure, morphology, and composition of the catalyst were characterized by X-ray diffractometry, transmission electron microscopy, and X-ray photoelectron spectroscopy. In addition, the catalyst load and ORR performance were tested. It can be seen that the Ag and Cu2+1O loading (mass fraction, %) of Ag@Cu2+1O/MWNTs catalyst are 9.32% and 5.90%, respectively, and the average particle size of Ag@Cu2+1O catalyst is about 7 nm. Ag@Cu2+1O/MWNTs catalyzes direct four-electron oxygen reduction in alkaline medium, the half-wave potential of Ag@Cu2+1O/MWNTs is 0.75 V, the limit diffusion current density is close to 5.5 mA/cm2 at 1 600 r/min and the slope of Tafel is 92 mV/dec, which is equivalent to the performance of 20%Pt/C and is more outstanding than Ag/MWNTs catalyst with 17.5%Ag loading capacity. Meanwhile, Ag@Cu2+1O/MWNTs has the same stability as 20%Pt/C and better resistance to methanol poisoning. When used as cathode catalyst for aluminum-air battery, Ag@Cu2+1O/MWNTs exhibits power density (148.7 mW/cm2), capacity (1 260 mAh/g) and stability which is comparable to that of 20%Pt/C.
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2022, Vol. 27 
