Mn2+-doped Co3Si2O5(OH)4 serpentine nanosheets with tuned d-band centers for efficient oxygen evolution in alkaline and neutral electrolytes

IF 9.6 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Rare Metals Pub Date : 2024-10-10 DOI:10.1007/s12598-024-02937-w

Shi-Cheng Huang, Yu-Long Zhou, Lian Duan, Ding-Zhong Luo, Bao-Peng Yang, Gen Chen, Xiao-He Liu, Jian-Guo Tang, Ning Zhang

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引用次数: 0

Abstract

Serpentine structured Co₃Si₂O₅(OH)₄ is inexpensive, chemically stable, and electrochemically active in oxygen evolution reactions (OER). However, the OER activity of Co₃Si₂O₅(OH)₄ materials is still unfavorable due to the low active sites. Here, Mn²⁺-doped Co₃Si₂O₅(OH)₄ serpentine nanosheets with tuned d-band centers are achieved for efficient oxygen evolution in alkaline and neutral electrolytes. The Co_xMn_3−xSi₂O₅(OH)₄ serpentine nanosheets are synthesized by a simple hydrothermal method. The optimized Co_2.4Mn_0.6Si₂O₅(OH)₄ serpentine nanosheets showed favorable OER overpotentials as well as stable durability in KOH solution and phosphate buffer solution, which were superior to most of the Co-based and Mn-based OER electrocatalysts. The in situ Raman spectroscopy shows that the materials are kept well in the electrochemical OER environments. Further density functional theory shows that the d-band center of Co_xMn_3−xSi₂O₅(OH)₄ serpentine nanosheets is shifted more upward in comparison with pristine Co₃Si₂O₅(OH)₄. The changes in the d-band center increase the adsorption of intermediates, optimize the reaction steps, and lower the energy barriers of the OER. That is the main reason for the OER enhancement Mn²⁺-doped Co₃Si₂O₅(OH)₄. This work gives an efficient strategy to design cheap and stable electrocatalytic materials for OER in a broad pH environment.

Graphical abstract

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掺杂 Mn2+ 的 Co3Si2O5(OH)4 蛇纹状纳米片具有可调整的 d 带中心，可在碱性和中性电解质中实现高效氧进化

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来源期刊

Rare Metals 工程技术-材料科学：综合

CiteScore

12.10

自引率

12.50%

发文量

2919

审稿时长

2.7 months

期刊介绍： Rare Metals is a monthly peer-reviewed journal published by the Nonferrous Metals Society of China. It serves as a platform for engineers and scientists to communicate and disseminate original research articles in the field of rare metals. The journal focuses on a wide range of topics including metallurgy, processing, and determination of rare metals. Additionally, it showcases the application of rare metals in advanced materials such as superconductors, semiconductors, composites, and ceramics.