Ce-doped cobalt-based hydroxide assisted with low-temperature molten salt for industrial oxygen evolution reaction

Q3 Energy

燃料化学学报 Pub Date : 2024-09-01 DOI:10.1016/S1872-5813(24)60456-1

WANG Fuli , LÜ Qianxi , DONG Yiwen , XIE Jingyi , WANG Zhicai , DONG Bin , CHAI Yongming

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引用次数: 0

Abstract

Developing low cost and high-performance oxygen evolution electrocatalysts is significant to improve the efficiency of water electrolysis for large-scale hydrogen production. Cobalt hydroxide is a promising electrocatalyst for oxygen evolution reaction (OER), but its poor conductivity and activity seriously restrict the practical application. A simple one-step low temperature molten salt method was applied to successfully synthesize the Ce-doped cobalt hydroxide nitrate (Ce-CoNH/CF), which exhibits outstanding OER performance with a low overpotential of 448 mV at the current density of 1000 mA/cm² in 1 mol/L KOH. The remarkable performance of Ce-CoNH/CF electrode in OER may be the comprehensive result of fast reaction kinetics, large electrochemical active specific surface area (ECSA) and small charge transfer resistance (R_ct) as revealed by the Tafel, cyclic voltammetry (CV) and electrochemical impedance spectra (EIS) analysis. Under the simulated industrial test conditions (6 mol/L KOH, 70 °C), the Ce-CoNH/CF electrode still displays excellent OER performance.

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低温熔盐辅助掺杂钴的氢氧化物用于工业氧进化反应

开发低成本、高性能的氧进化电催化剂对于提高电解水的效率以实现大规模制氢具有重要意义。氢氧化钴是一种很有前景的氧进化反应（OER）电催化剂，但其导电性和活性较差，严重制约了其实际应用。研究人员采用简单的一步低温熔盐法成功合成了掺杂铈的氢氧化钴硝酸盐（Ce-CoNH/CF），该催化剂在 1 mol/L KOH 溶液中的电流密度为 1000 mA/cm2 时，过电位低至 448 mV，表现出卓越的氧进化反应性能。塔菲尔、循环伏安法和电化学阻抗谱分析表明，Ce-CoNH/CF 电极在 OER 中的优异性能可能是反应动力学快、电化学活性比表面积大和电荷转移电阻小的综合结果。在模拟工业测试条件（6 mol/L KOH，70 °C）下，Ce-CoNH/CF 电极仍然表现出优异的 OER 性能。

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来源期刊

燃料化学学报 Chemical Engineering-Chemical Engineering (all)

CiteScore

2.80

自引率

0.00%

发文量

5825

期刊介绍： Journal of Fuel Chemistry and Technology (Ranliao Huaxue Xuebao) is a Chinese Academy of Sciences(CAS) journal started in 1956, sponsored by the Chinese Chemical Society and the Institute of Coal Chemistry, Chinese Academy of Sciences(CAS). The journal is published bimonthly by Science Press in China and widely distributed in about 20 countries. Journal of Fuel Chemistry and Technology publishes reports of both basic and applied research in the chemistry and chemical engineering of many energy sources, including that involved in the nature, processing and utilization of coal, petroleum, oil shale, natural gas, biomass and synfuels, as well as related subjects of increasing interest such as C1 chemistry, pollutions control and new catalytic materials. Types of publications include original research articles, short communications, research notes and reviews. Both domestic and international contributors are welcome. Manuscripts written in Chinese or English will be accepted. Additional English titles, abstracts and key words should be included in Chinese manuscripts. All manuscripts are subject to critical review by the editorial committee, which is composed of about 10 foreign and 50 Chinese experts in fuel science. Journal of Fuel Chemistry and Technology has been a source of primary research work in fuel chemistry as a Chinese core scientific periodical.