双金属
电催化剂
材料科学
化学工程
析氧
细菌纤维素
电化学
催化作用
碳纤维
纤维素
纳米颗粒
石墨
碳纳米纤维
纳米技术
碳纳米管
电极
化学
复合数
复合材料
有机化学
物理化学
工程类
作者
Jiajia Li,Tianyu Tan,Yangming Xie,Jianzhou Chu,Ling Li,Bo Ouyang,Erjun Kan,Wenming Zhang
标识
DOI:10.1016/j.jcis.2023.02.058
摘要
In this work, a three-dimensional (3D) multifunctional Co/CoFeNC@N-CNF electrocatalyst was first synthesized by the pyrolysis of a CoFe bimetal-centred metal-organic framework (MOF) and bacterial cellulose (BC). The initial potential and half-wave potential of Co/CoFeNC@N-CNF can reach 0.99 V and 0.8 V. Low overpotentials of 320 mV and 155 mV are purely required for the oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) at a current density of 10 mA cm-2, respectively. The electrochemical performance of Co/CoFeNC@N-CNF exceeds most bimetal-MOF-derived electrocatalysts reported to date. The superior electrochemical performance is mainly due to abundant active sites, high-efficiency electrochemical performance, and high electron transport efficiency. In addition, the theoretical calculation results show that the synergistic effect of the CoFe bimetal can optimize the adsorption energy for intermediates of the oxygen reduction reaction (ORR), OER and HER. Furthermore, we assembled a mold and solid Zn-air battery using the catalyst as an air cathode catalyst, demonstrating the maximum power densities of 292 mW cm-2 and 178 mW cm-2. The 3D structure electrocatalysts derived from the MOF and bacterial cellulose provide an innovative and instructive approach for the design of diverse energy nanomaterials.
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