Formation of mesoporous Co/CoS/Metal-N-C@S, N-codoped hairy carbon polyhedrons as an efficient trifunctional electrocatalyst for Zn-air batteries and water splitting

电催化剂 过电位 析氧 分解水 催化作用 介孔材料 化学工程 塔菲尔方程 材料科学 化学 纳米颗粒 碳纤维 无机化学 电化学 纳米技术 电极 有机化学 物理化学 光催化 工程类 复合材料 复合数
作者
Lei Yan,Haiyan Wang,Junling Shen,Jiqiang Ning,Yijun Zhong,Yong Hu
出处
期刊:Chemical Engineering Journal [Elsevier BV]
卷期号:403: 126385-126385 被引量:211
标识
DOI:10.1016/j.cej.2020.126385
摘要

It remains a huge challenge to design and realize trifunctional high-efficiency and low-cost electrocatalysts for oxygen reduction reaction (ORR), oxygen evolution reaction (OER) and hydrogen evolution reaction (HER). Herein, with the introduction of CdS and ferrocene, a metal–organic framework (MOF)-induced strategy is reported to synthesize a hierarchical trifunctional electrocatalyst based on Co/CoS nanoparticles and metal (Co, Fe)-N-C species in a hairy S, N-codoped mesoporous carbon polyhedron interwoven with carbon nanotubes (Co/CoS/Fe-HSNC). The specific roles of Co, CoS and (Co, Fe)-N-C active species in Co/CoS/Fe-HSNC catalyst for ORR, OER and HER are also well recognized. Besides, CdS nanoparticles is demonstrated to act as a pore former and S sources both for reaction and doping, and ferrocene is employed to initiate the in-situ growth of carbon nanotubes and Fe-N-C active sites which both contribute to superior multifunctional activities. Benefitting from the rationally designed nanostructures, the ORR half-potential of the Co/CoS/Fe-HSNC electrocatalyst reaches 0.906 V in 0.1 M KOH, about 65 mV larger than commercial Pt/C electrocatalyst, and a low overpotential of 250 mV is achieved for OER and 138 mV for HER at a current density of 10 mA cm−2. Constructed with the Co/CoS/Fe-HSNC catalyst, a Zn-air battery exhibits a high power density of 213 mW cm−2 and a small charge/discharge voltage gap of 0.79 V at 2.0 mA cm−2. The presented strategy provides new insight into the construction of MOF-derived hierarchical multifunctional catalysts for Zn-air batteries and water electrolysis.
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