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Liu Y, Wang L, Hübner R, Kresse J, Zhang X, Deconinick M, Vaynzof Y, Weidinger IM, Eychmüller A. Cobalt-based Co 3Mo 3N/Co 4N/Co Metallic Heterostructure as a Highly Active Electrocatalyst for Alkaline Overall Water Splitting. Angew Chem Int Ed Engl 2024; 63:e202319239. [PMID: 38314947 DOI: 10.1002/anie.202319239] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2023] [Revised: 01/29/2024] [Accepted: 01/30/2024] [Indexed: 02/07/2024]
Abstract
Alkaline water electrolysis holds promise for large-scale hydrogen production, yet it encounters challenges like high voltage and limited stability at higher current densities, primarily due to inefficient electron transport kinetics. Herein, a novel cobalt-based metallic heterostructure (Co3Mo3N/Co4N/Co) is designed for excellent water electrolysis. In operando Raman experiments reveal that the formation of the Co3Mo3N/Co4N heterointerface boosts the free water adsorption and dissociation, increasing the available protons for subsequent hydrogen production. Furthermore, the altered electronic structure of the Co3Mo3N/Co4N heterointerface optimizes ΔGH of the nitrogen atoms at the interface. This synergistic effect between interfacial nitrogen atoms and metal phase cobalt creates highly efficient active sites for the hydrogen evolution reaction (HER), thereby enhancing the overall HER performance. Additionally, the heterostructure exhibits a rapid OH- adsorption rate, coupled with great adsorption strength, leading to improved oxygen evolution reaction (OER) performance. Crucially, the metallic heterojunction accelerates electron transport, expediting the afore-mentioned reaction steps and enhancing water splitting efficiency. The Co3Mo3N/Co4N/Co electrocatalyst in the water electrolyzer delivers excellent performance, with a low 1.58 V cell voltage at 10 mA cm-2, and maintains 100 % retention over 100 hours at 200 mA cm-2, surpassing the Pt/C||RuO2 electrolyzer.
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Affiliation(s)
- Yuanwu Liu
- Physical Chemistry, TU Dresden, Zellescher Weg 19, 01069, Dresden, Germany
| | - Lirong Wang
- School of Materials Science and Engineering, Hebei University of Technology, Tianjin, 300130, China
| | - René Hübner
- Institute of Ion Beam Physics and Materials Research, Helmholtz-Zentrum Dresden-Rossendorf e.V., Bautzner Landstrasse 400, 01328, Dresden, Germany
| | - Johannes Kresse
- Physical Chemistry, TU Dresden, Zellescher Weg 19, 01069, Dresden, Germany
| | - Xiaoming Zhang
- School of Materials Science and Engineering, Hebei University of Technology, Tianjin, 300130, China
| | - Marielle Deconinick
- Chair for Emerging Electronic Technologies, TU Dresden, Nöthnitzer Str. 61, Dresden, 01187 Sachsen, Germany
- Leibniz-Institute for Solid State and Materials Research Dresden, Helmholtzstraße 20, Dresden, 01069 Sachsen, Germany
| | - Yana Vaynzof
- Chair for Emerging Electronic Technologies, TU Dresden, Nöthnitzer Str. 61, Dresden, 01187 Sachsen, Germany
- Leibniz-Institute for Solid State and Materials Research Dresden, Helmholtzstraße 20, Dresden, 01069 Sachsen, Germany
| | - Inez M Weidinger
- Fakultät Chemie und Lebensmittelchemie, Technische Universität Dresden, Zellescher Weg 19, 01069, Dresden, Germany
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