Surface Reconstruction of An Integrated CoO‐Co2Mo3O8 electrode Enabling Efficient Ampere‐Level Hydrogen Evolution in Alkaline Water or Seawater

IF 16.1 1区 化学 Q1 CHEMISTRY, MULTIDISCIPLINARY Angewandte Chemie International Edition Pub Date : 2025-01-27 DOI:10.1002/anie.202423863
Jiajia Lu, Peng-Jun Deng, Yang Liu, Shengyu Jing, Panagiotis E. Tsiakaras
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Abstract

To accelerate the water dissociation in the Volmer step and alleviate the destruction of bubbles to the physical structure of catalysts during the alkaline hydrogen evolution, an integrated electrode of cobalt oxide and cobalt‐molybdenum oxide grown on Ni foam, named CoO‐Co2Mo3O8, is designed. This integrated electrode enhances the catalyst‐substrate interaction confirmed by a micro‐indentation tester, and thus hinders the destruction of the physical structure of catalysts caused by bubbles. Electrochemical testing shows the occurrence of a surface reconstruction of the integrated electrode, and CoO is transformed into Co(OH)2, denoted as Co(OH)2‐Co2Mo3O8. Theoretical calculations determine that Co(OH)2‐Co2Mo3O8 has significantly low activation barrier for water dissociation and presents easy hydroxide desorption, which accelerate the catalytic reaction. Electrochemical experiments show that Co(OH)2‐Co2Mo3O8 exhibits outstanding activity, reaching current density values of −100 and −1000 mA cm−2 with overpotentials only 57.8 and 195.8 mV, respectively. Furthermore, it demonstrates excellent stability at −500 and −1000 mA cm−2 for 200 h. Combined with the previously reported anode, the two‐electrode system also provides the stable operation from 100 to 1000 mA cm−2 for 600 h in alkaline solution, and over 200 h at 500 and 1000 mA cm−2 in alkaline seawater.
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来源期刊
CiteScore
26.60
自引率
6.60%
发文量
3549
审稿时长
1.5 months
期刊介绍: Angewandte Chemie, a journal of the German Chemical Society (GDCh), maintains a leading position among scholarly journals in general chemistry with an impressive Impact Factor of 16.6 (2022 Journal Citation Reports, Clarivate, 2023). Published weekly in a reader-friendly format, it features new articles almost every day. Established in 1887, Angewandte Chemie is a prominent chemistry journal, offering a dynamic blend of Review-type articles, Highlights, Communications, and Research Articles on a weekly basis, making it unique in the field.
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