电催化剂
过电位
催化作用
碳纤维
析氧
热解
双功能
化学工程
材料科学
化学
无机化学
电化学
电极
有机化学
复合数
复合材料
物理化学
工程类
作者
Min Zhu,Juan Nong,Pu Xie,Ao Sheng Zhu,Min Zhi Rong,Ming Qiu Zhang
标识
DOI:10.1016/j.electacta.2018.10.200
摘要
Carbon-based materials are crucial conductive additive and non-metal electrocatalysts for oxygen reduction reaction (ORR) and oxygen evolution reaction (OER). However, the high potential needed for driving OER usually leads to electrochemical oxidation of carbon-based materials, reducing their catalysis durability. Meanwhile, the weak interaction between carbon-based conductive additive and transition metal oxides, nitrides, sulfides and other compounds that possess electrocatalyst activity affects the performance of the electrocatalysts. Herein, a novel three-dimensional (3D) bifunctional electrocatalyst was prepared by embedding CoO nanoparticles into nitrogen and sulfur co-doped carbon framework (denoted as Co/N/S-CF) through morphology-controlled solid-state pyrolysis. The carbon framework was derived from a morphology-retaining pyrolysis of poly(aniline-co-2-aminothiophenol) precursor, retaining the 3D porous structure of the latter. The embedded CoO nanoparticles improve electrocatalysis durability of the 3D carbon-based framework as CoO has lower OER potential than the electrooxidation decomposition potential of doped carbon materials. Only 1.61 V can attain a current density of 10 mA cm−2. Meanwhile, the catalyst retains the highly efficient activity of N and S co-doped carbon framework towards ORR with an onset potential of about 0.92 V, suggesting that it is a qualified electrocatalyst for ORR. Long-term stability of the catalyst for ORR and OER is superior to the commercially available Pt/C and IrO2. Furthermore, the overpotential between ORR and OER (oxygen electrode activity parameter) of the catalyst is calculated to be 0.796 V, indicating that the catalyst could be a promising bifunctional electrocatalyst for both ORR and OER.
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