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Zhang L, Hu Z, Li H, Ren Q, Qiu Y, Qu J, Hu S. Nickel Foam Supported NiO@Ru Heterostructure Towards High-Efficiency Overall Water Splitting. Chemphyschem 2021; 22:1785-1791. [PMID: 34153153 DOI: 10.1002/cphc.202100317] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2021] [Revised: 06/03/2021] [Indexed: 01/07/2023]
Abstract
Electrocatalytic water splitting for hydrogen production from renewable energy requires the innovation of electrocatalysts with high activity and low cost. In this work, densely packed NiO@Ru nanosheets were fabricated on the surface of Ni foam through a two-step method of Ni(OH)2 growth followed by Ru deposition. Through pair distribution function analysis from selected-area electron diffraction and X-ray photoelectron spectroscopy, the interface structure feature is revealed as a thin layer of perovskite NiRuO3 sandwiched between NiO and Ru. The electrode exhibits high activity and durability for HER and OER, delivering a current density of 10 mA cm-2 at a voltage of 1.55 V for overall water splitting in 1 M KOH. The excellent performance can be attributed to the intimate interface contact of NiO and Ru in addition to low charge transfer resistance and super-hydrophilic surface structure, as verified by the electrochemical impedance spectroscopy and contact-angle measurement.
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Affiliation(s)
- Linghui Zhang
- Department of Chemistry, School of Science, Tianjin Key Laboratory of Molecular Optoelectronic Science, Tianjin University, Tianjin, 300072, China
| | - Zheng Hu
- Department of Chemistry, School of Science, Tianjin Key Laboratory of Molecular Optoelectronic Science, Tianjin University, Tianjin, 300072, China
| | - Hui Li
- Department of Chemistry, School of Science, Tianjin Key Laboratory of Molecular Optoelectronic Science, Tianjin University, Tianjin, 300072, China.,Institute of Energy, Hefei Comprehensive National Science Center, Hefei, Anhui, 230026, China
| | - Qianqian Ren
- Department of Chemistry, School of Science, Tianjin Key Laboratory of Molecular Optoelectronic Science, Tianjin University, Tianjin, 300072, China
| | - Yishu Qiu
- Department of Chemistry, School of Science, Tianjin Key Laboratory of Molecular Optoelectronic Science, Tianjin University, Tianjin, 300072, China.,Institute of Energy, Hefei Comprehensive National Science Center, Hefei, Anhui, 230026, China
| | - Jianqiang Qu
- Department of Chemistry, School of Science, Tianjin Key Laboratory of Molecular Optoelectronic Science, Tianjin University, Tianjin, 300072, China
| | - Shi Hu
- Department of Chemistry, School of Science, Tianjin Key Laboratory of Molecular Optoelectronic Science, Tianjin University, Tianjin, 300072, China.,Institute of Energy, Hefei Comprehensive National Science Center, Hefei, Anhui, 230026, China
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Wijten JHJ, Garcia‐Torregrosa I, Dijkman EA, Weckhuysen BM. Basicity and Electrolyte Composition Dependent Stability of Ni-Fe-S and Ni-Mo Electrodes during Water Splitting. Chemphyschem 2020; 21:518-524. [PMID: 31981396 PMCID: PMC7155041 DOI: 10.1002/cphc.201901219] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/25/2019] [Revised: 01/18/2020] [Indexed: 11/07/2022]
Abstract
Non-noble metal electro-catalysts for water splitting are highly desired when we are moving towards a society where green electrons are becoming abundantly available, offering clear prospects to make our society more sustainable. In this work, Ni-Fe-S is reported as a high performing anode material for the water splitting reaction, operating at low overpotentials and showing high apparent stability. Furthermore, Ni-Mo electrodes are developed on metallic foam substrates and optimized in terms of their performance. The Ni-Fe-S material as anode, combined and integrated with Ni-Mo as cathode in a cell configuration, splits water at 10 mA cm-2 and a potential of 1.55 V. Similar to previous reports, we confirm that Mo leaches from Ni-Mo/Ni foam electrodes. Cycling tests and ICP-AES measurements show that the stability of Ni-Fe-S is apparent, and that in reality S is leaching from the material as was already suggested in literature. We expand on this knowledge and show that the leaching of S is dependent on both pH and the cation used during electrocatalysis. Furthermore, we find that applying an oxidative potential is in truth stabilizing towards S and that the alkalinity causes leaching. S was furthermore mobile and found to segregate towards the surface. Finally, using too low pH values (11 and lower) result in the passivating hydroxide metal layers being destroyed and the Ni-Fe-S dissolving completely.
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Affiliation(s)
- Jochem H. J. Wijten
- Inorganic Chemistry and CatalysisDebye Institute for Nanomaterials ResearchUniversiteitsweg 99UtrechtThe Netherlands
| | - Iván Garcia‐Torregrosa
- Inorganic Chemistry and CatalysisDebye Institute for Nanomaterials ResearchUniversiteitsweg 99UtrechtThe Netherlands
| | - Eva A. Dijkman
- Inorganic Chemistry and CatalysisDebye Institute for Nanomaterials ResearchUniversiteitsweg 99UtrechtThe Netherlands
| | - Bert M. Weckhuysen
- Inorganic Chemistry and CatalysisDebye Institute for Nanomaterials ResearchUniversiteitsweg 99UtrechtThe Netherlands
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