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Controlled Synthesis of a Three-Segment Heterostructure for High-Performance Overall Water Splitting

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Institute of Chemistry, CAS Research/Education Center for Excellence in Molecular Sciences, Chinese Academy of Sciences, Beijing 100190, P. R. China
Key Laboratory of Energy Materials Chemistry, Ministry of Education; Key laboratory of Advanced Functional Materials, Autonomous Region; Institute of Applied Chemistry, Xinjiang University, Urumqi 830046, Xinjiang, P. R. China
§ University of Chinese Academy of Sciences, Beijing 100049, P. R. China
School of Polymer Science and Engineering, Qingdao University of Science and Technology, Qingdao 266042, P. R. China
*E-mail: [email protected] (Y.X.).
*E-mail: [email protected] (D.J.).
*E-mail: [email protected] (Y.L.).
Cite this: ACS Appl. Mater. Interfaces 2018, 10, 2, 1771–1780
Publication Date (Web):December 22, 2017
https://doi.org/10.1021/acsami.7b16791
Copyright © 2017 American Chemical Society

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    Abstract

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    Developing earth-abundant, highly active, and robust electrocatalysts capable of both oxygen and hydrogen evolution reactions is crucial for the commercial success of renewable energy technologies. Here we demonstrate a facile and universal strategy for fabricating transition metal (TM) sulfides by controlling the atomic ratio of TM precursors for water splitting in basic media. Density functional theory calculations reveal that the incorporation of Fe/Co can significantly improve the catalytic performance. The optimal material exhibits extremely small overpotentials of 208 mV for oxygen evolution and 68 mV for hydrogen evolution at 10 mA cm–2 with robust long-term stability. The optimized material was used as bifunctional electrodes for overall water splitting, which delivers 10 mA cm–2 at a very low cell voltage of 1.44 V with robust stability over 80 h at 100 mA cm–2 without degradation, much better than the combination of Pt and RuO2 as benchmark catalysts. The excellent water-splitting performance sheds light on the promising potential of such sulfides as high activity and robust stable electrodes.

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    The Supporting Information is available free of charge on the ACS Publications website at DOI: 10.1021/acsami.7b16791.

    • Computational details about the free energy of FeCo-based catalysts, XRD patterns, and EIS Nyquist plots of the samples, SEM profiles and XPS data of FeCoS-1 after the stability tests, overpotentials of FeCoS-1 for overall water splitting at current densities, CV curves of as-prepared catalysts in the potential range of −0.43 to −0.33 V at different scan rates, optimized structures of HO*, O*, and HOO* adsorbed on FeS, CoS, and FeCoS-1, comparison of the OER performances (PDF)

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