Low Zn-doped Co3O4 nanorods for enhanced hydrogen evolution reaction

被引:0
|
作者
Duan, Wenyuan [1 ]
Yang, Zhifan [2 ]
Chen, Shaoquan [2 ]
Chen, Guanjun [3 ]
Li, Yanlin [4 ]
Gao, Jianjing [1 ]
Zhao, Yuzhen [1 ]
机构
[1] Xijing Univ, Xian Key Lab Adv Photoelect Mat & Energy Convers D, Xian 710123, Peoples R China
[2] Xijing Univ, Sch Elect Informat, Xian 710123, Shaanxi, Peoples R China
[3] Inorgan Mat Shaanxi Univ Sci & Technol, Sch Mat Sci & Engn, Shaanxi Key Lab Green Preparat & Functionalizat, Xian 710021, Shaanxi, Peoples R China
[4] Xian Univ Architecture & Technol, Sch Mat Sci & Engn, Xian 710055, Peoples R China
关键词
Co3O4; Low Zn-doped; Tetrahedral Co2+; HER; Gibbs free energy; RECENT PROGRESS; EFFICIENT; ELECTROCATALYSTS; NANOPARTICLES; DESIGN; CARBON;
D O I
10.1016/j.jssc.2024.124945
中图分类号
O61 [无机化学];
学科分类号
070301 ; 081704 ;
摘要
Transition metal oxides have been identified as the best potential candidates to replace Pt-based HER catalysts. But they are still limited by the high HER overpotential, due to the undesirable adsorption/desorption of surface hydrogen. In this work, Zn with low concentrations were incorporated into the tetrahedral Co2+ sites of Co3O4 by hydrothermal and subsequent annealing treatment. They exhibit excellent HER performance. Particularly, when the Zn content in Co3O4 is 6.3 at%, an overpotential of 79.2 mV at the current density of 10 mA cm(-2) was obtained in alkaline medium, which significantly better than pure Co3O4 catalyst (196.3 mV). Moreover, the current density of the Zn-doped Co3O4 catalyst can maintained 93 % after 10 h and 80 % after 20 h. DFT calculations reveal that the Delta G(H*) of Zn-doped Co3O4 (0.827 eV) is smaller and closer to zero than pure Co3O4 (1.023 eV). This work provides a deep insight into the rational design of low-level metal-doped cobalt oxidebased electrocatalysts.
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页数:7
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