Study on the Preparation and Performance of Metal-free Electrocatalyst from Biochar of Chinese Medicine Slag Toward Oxygen Reduction Reaction
ZHAO Yue1,2,3,4,†, LI Denian2,3,4,5,†, YANG Jizhang2,3,4,5, XIONG Chuanxi1, YUAN Haoran2,3,4,5,*, CHEN Yong2,3,4,5
1 School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China 2 Guangzhou Institute of Energy Research, Chinese Academy of Sciences, Guangzhou 510640, China 3 Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou),Guangzhou 511458, China 4 Guangdong Provincial Key Laboratory of New Energy and Renewable Energy Research, Development and Application, Guangzhou 510640, China 5 Key Laboratory of Renewable Energy, Chinese Academy of Sciences, Guangzhou 510640, China
Abstract: Using ZnCl2 as an activator, Chinese medicine slag was converted into metal-free carbon electrocatalyst for oxygen reduction reaction through coupled pyrolysis and activation. The structural features of the carbon-based electrocatalysts and the oxygen reduction reaction performance were analyzed with SEM, nitrogen isotherm adsorption-desorption test, XRD, XPS, elemental analysis and electrochemical workstations. Especially, the product obtained with activation agent/biochar mass ratio of 4 ∶1 under 800 ℃ thermal activation, namely ZC-4 ∶1-800, which has a mesoporous and microporous structure with a specific surface area of up to 970.4 m2/g, delivered the optimal oxygen reduction electrocatalyst performance, with a starting potential of 0.9 V, a half-wave potential of 0.8 V, and a limit current density of 4.9 mA/cm2, which close to that of the commercial 20wt% Pt/C. Besides, it also revealed obviously superior stability and methanol tolerance over 20%Pt/C counterpart, and thus promise great potential as sustainable alternative candidate for practical use. Meanwhile, this work also provides a new path for the resource utilization of waste biomass.
赵悦, 李德念, 阳济章, 熊传溪, 袁浩然, 陈勇. 中药渣生物炭活化制备碳基电催化剂及其氧还原反应催化性能研究[J]. 材料导报, 2023, 37(2): 21070205-7.
ZHAO Yue, LI Denian, YANG Jizhang, XIONG Chuanxi, YUAN Haoran, CHEN Yong. Study on the Preparation and Performance of Metal-free Electrocatalyst from Biochar of Chinese Medicine Slag Toward Oxygen Reduction Reaction. Materials Reports, 2023, 37(2): 21070205-7.
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