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From Water Oxidation to Reduction: Homologous Ni–Co Based Nanowires as Complementary Water Splitting Electrocatalysts
Abstract
A homologous Ni–Co based nanowire system, consisting of both nickel cobalt oxide and nickel cobalt sulfide nanowires, is developed for efficient, complementary water splitting. The spinel‐type nickel cobalt oxide (NiCo2O4) nanowires are hydrothermally synthesized and can serve as an excellent oxygen evolution reaction catalyst. Subsequent sulfurization of the NiCo2O4 nanowires leads to the formation of pyrite‐type nickel cobalt sulfide (Ni0.33Co0.67S2) nanowires. Due to the 1D nanowire morphology and enhanced charge transport capability, the Ni0.33Co0.67S2 nanowires function as an efficient, stable, and robust nonnoble metal electrocatalyst for hydrogen evolution reaction (HER), substantially exceeding CoS2 or NiS2 nanostructures synthesized under similar methods. The Ni0.33Co0.67S2 nanowires exhibit low onset potential of −65, −39, and −50 mV versus reversible hydrogen electrode, Tafel slopes of 44, 68, and 118 mV dec−1 at acidic, neutral, and basic conditions, respectively, and excellent stability, comparable to the best reported non‐noble metal‐based HER catalysts. Furthermore, the homologous Ni0.33Co0.67S2 nanowires and NiCo2O4 nanowires are assembled into an all‐nanowire based water splitting electrolyzer with a current density of 5 mA cm−2 at a voltage as 1.65 V, thus suggesting a unique homologous, earth abundant material system for water splitting.
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“The above results clearly demonstrate that the good catalytic activity would be attributed to the synergic effect of the bimetallic nature and three-dimensional porous structure of the rGO aerogel with good conductivity and favorable mass-transfer pathways.22,47–49”
From Tunable CoFe-based active sites on 3D heteroatom doped graphene aerogel electrocatalysts via annealing gas regulation for efficient water splitting (2018) · cites this paper as [47]
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Metadata
- Authors
- Peng, Z., Jia, D., Al‐Enizi, A. M., Elzatahry, A. A., & Zheng, G.
- Affiliations
- Fudan University (CN)
- King Saud University (SA)
- Qatar University (QA)
- Corresponding author
- Zheng, Gengfeng
- Venue
- Advanced Energy Materials
- Publisher
- Wiley
- Published
- 2015-02-16
- Volume
- 5
- Issue
- 9
- ISSN
- 1614-6832 (ISSN-L)
- 1614-6840
- OpenAlex
- W2144307294
- Cited by
- 494
- References
- 37
- Citations by year
- 2026: 10 · 2025: 11 · 2024: 18 · 2023: 26 · 2022: 37 · 2021: 46 · 2020: 40 · 2019: 69 · 2018: 78 · 2017: 84 · 2016: 56 · 2015: 19
- FWCI
- 23.39
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Advanced Energy Materials (publishedVersion)
- Qatar University QSpace (Qatar University) (submittedVersion)
- Funders
- National Key Basic Research Program of China (2013CB934104)
- Natural Science Foundation of China (21322311, 21473038, 21071033)
- Science and Technology Commission of Shanghai Municipality (14JC1490500)
- Doctoral Fund of Ministry of Education of China (20130071110031)
- Program for Professor of Special Appointment
- Deanship of Scientific Research at King Saud University (RG#1435-010)
- Topics
- Physical Sciences › Energy › Renewable Energy, Sustainability and the Environment › Electrocatalysts for Energy Conversion
- Physical Sciences › Energy › Renewable Energy, Sustainability and the Environment › CO2 Reduction Techniques and Catalysts
- Physical Sciences › Energy › Renewable Energy, Sustainability and the Environment › Advanced Photocatalysis Techniques
- Keywords
- water splitting, oxygen evolution reaction, hydrogen evolution reaction, NiCo2O4 nanowires, nickel cobalt oxide, NiCo2S4, sulfidation, non-noble metal electrocatalysts, spinel oxides, charge transport, earth-abundant catalysts
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