材料科学
电池(电)
碳纤维
化学工程
电解质
电催化剂
锌
吸附
纳米技术
电极
电化学
化学
冶金
有机化学
复合材料
复合数
物理
工程类
量子力学
物理化学
功率(物理)
作者
Xiao-Feng Han,Tao Wang,Jia Guo,Zhenjie Lu,Xingxing Chen,Dongling Wu
标识
DOI:10.1016/j.matchemphys.2022.126724
摘要
It is of great significance to develop efficient non-noble metal electrocatalysts for oxygen reduction reaction (ORR). Herein, the starch-based carbon microspheres (CMS) electrocatalyst with ultrahigh specific surface area (SSA) of 2799 m2 g-1 is prepared by solvent-free method under hypersaline environment that composed of ZnCl2 and FeCl3·H2O. The formed carbon microspheres with hierarchical porous structure are beneficial to the adequate exposure of active sites and the free transportation of electrolyte. Importantly, the hypersaline environment favors not only the high yield of carbon material, but also the creation of abundant carbon defects with the presence of ZnFe2O4 coated on carbon microspheres, thus promoting the oxygen adsorption and desorption. The assembled zinc-air battery based on CMS2-800 exhibits prominent cycle stability, high open circuit voltage (1.43 V) and big power density (183.5 mW cm-2), superior to the battery constructed with commercialized Pt/C + RuO2. This work provides an efficient strategy to prepare electrocatalysts with starch as the starting material for high-performance zinc-air battery.
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