1. Defect-rich CoRu alloy embedded in the porous carbon serving as highly-efficient and bifunctional electrocatalyst for overall water splitting over a wide pH range.
- Author
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Wei, Ying, Gao, Mengting, Huo, Xuemeng, Zhu, Wenjie, Liu, Qingqing, Qiang, Jinyuan, Liu, Wanwan, Wang, Ying, Li, Xu, Huang, Jianfeng, Chen, Guanjun, and Feng, Yongqiang
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CRYSTAL defects , *OXYGEN evolution reactions , *HYDROGEN evolution reactions , *ALLOYS , *ENERGY conversion - Abstract
[Display omitted] • A dual-function and pH-universal electrocatalyst of CoRu/C was synthesized. • The CoRu/C exhibits excellent electrocatalytic activity for overall water splitting. • The crystal defects could account for the enhanced electrocatalytic performance. Exploring highly-efficient and pH-universal overall water splitting electrocatalysts are critical but keep challenging. Herein, a highly-efficient, dual-function and pH-universal electrocatalyst consisting of CoRu alloy nanoparticles embedded in the carbon matrix (CoRu/C) was successfully synthesized through an acid etching-pyrolysis conversion process using ZIF-67 as a precursor. Benefiting from the rich crystal defects created during the alloy formation process that could serve as active catalytic sites and the optimized electronic structure, the as-obtained CoRu/C electrocatalyst required overpotentials of only 18 and 37 mV to reach a current density of 10 mA cm−2 for hydrogen evolution reaction (HER) and 184 and 170 mV for oxygen evolution reaction (OER) in 1.0 M KOH and 0.5 M H 2 SO 4 aqueous solution, respectively. For practical application, the CoRu/C catalyst only needs a cell voltage of 1.49 and 1.45 V in a two-electrode overall water splitting system to achieve a current density of 10 mA cm−2 in alkaline and acidic medium, respectively. The present work paves a new way for the design and construction of efficient bifunctional electrocatalyst for overall water splitting, and would inspire widespread research interest in the field of energy storage and conversion. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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