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Feng C, Chen M, Zhou Y, Xie Z, Li X, Xiaokaiti P, Kansha Y, Abudula A, Guan G. High-entropy NiFeCoV disulfides for enhanced alkaline water/seawater electrolysis. J Colloid Interface Sci 2023; 645:724-734. [PMID: 37172482 DOI: 10.1016/j.jcis.2023.04.172] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2023] [Revised: 04/15/2023] [Accepted: 04/30/2023] [Indexed: 05/15/2023]
Abstract
Creating electrocatalysts with high activity and stability to meet the needs of highly effective seawater splitting is of great importance to achieve the goal of hydrogen production from abundant seawater source, which however is still challenging owing to sluggish oxygen evolution reaction (OER) dynamics and the existed competitive chloride evolution reaction. Herein, high-entropy (NiFeCoV)S2 porous nanosheets are uniformly fabricated on Ni foam via a hydrothermal reaction process with a sequential sulfurization step for alkaline water/seawater electrolysis. The obtained rough and porous nanosheets provide large active surface area and exposed more active sites, which can facilitate mass transfer and are conducive to the improvement of the catalytic performance. Combined with the strong synergistic electron modulation effect of multi elements in (NiFeCoV)S2, the as-fabricated catalyst exhibits low OER overpotentials of 220 and 299 mV at 100 mA cm-2 in alkaline water and natural seawater, respectively. Besides, the catalyst can withstand a long-term durability test for more than 50 h without hypochlorite evolution, showing excellent corrosion resistance and OER selectivity. By employing the (NiFeCoV)S2 as the electrocatalyst for both anode and cathode to construct an overall water/seawater splitting electrolyzer, the required cell voltages are only 1.69 and 1.77 V to reach 100 mA cm-2 in alkaline water and natural seawater, respectively, showing a promising prospect towards the practical application for efficient water/seawater electrolysis.
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Affiliation(s)
- Changrui Feng
- Graduate School of Science and Technology, Hirosaki University, 3-Bunkyocho, Hirosaki 036-8561, Japan
| | - Meng Chen
- Graduate School of Science and Technology, Hirosaki University, 3-Bunkyocho, Hirosaki 036-8561, Japan
| | - Yifan Zhou
- Energy Conversion Engineering Laboratory, Institute of Regional Innovation, Hirosaki University, 3-Bunkyocho, Hirosaki 036-8561, Japan; Graduate School of Sustainable Community Studies, Hirosaki University, 1-Bunkyocho, Hirosaki 036-8560, Japan
| | - Zhengkun Xie
- College of Chemistry, Zhengzhou University, Kexue Avenue 100, Zhengzhou, Henan 450001, China
| | - Xiumin Li
- School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, China
| | | | - Yasuki Kansha
- Organization for Programs on Environmental Sciences, Graduate School of Arts and Sciences, The University of Tokyo, 3-8-1 Komaba, Meguro-ku, Tokyo 153-8902, Japan
| | - Abuliti Abudula
- Graduate School of Science and Technology, Hirosaki University, 3-Bunkyocho, Hirosaki 036-8561, Japan.
| | - Guoqing Guan
- Graduate School of Science and Technology, Hirosaki University, 3-Bunkyocho, Hirosaki 036-8561, Japan; Energy Conversion Engineering Laboratory, Institute of Regional Innovation, Hirosaki University, 3-Bunkyocho, Hirosaki 036-8561, Japan; Graduate School of Sustainable Community Studies, Hirosaki University, 1-Bunkyocho, Hirosaki 036-8560, Japan.
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