Superhydrophilic/Superaerophobic Hierarchical NiP2@MoO2/Co(Ni)MoO4 Core–Shell Array Electrocatalysts for Efficient Hydrogen Production at Large Current Densities
Abstract
Rationally constructing low-cost, high-efficiency, and durable electrocatalysts toward the hydrogen evolution reaction at large current densities is imperative for water splitting, especially for large-scale industrial applications. Herein, a hierarchical core–shell NiP 2 @MoO 2 /Co( Ni )MoO 4 cuboid array electrode with superhydrophilic/superaerophobic properties is successfully fabricated and the formation mechanism of the core–shell structure is systematically investigated. Through an in situ partially converted gas–solid reaction during the phosphating process, Ni and Co elements are leached and rearranged to form NiP 2 particles and amorphous CoO as the shell layer and the inner undecomposed Co( Ni )MoO 4 crystals serve as the core layer. Because of its seamless core–shell structure and superhydrophilicity/superaerophobicity of hierarchical cuboid arrays, NiP 2 @MoO 2 /Co( Ni )MoO 4 exhibits superior HER activity in 1 M KOH with only an overpotential of 297 mV to deliver 1000 mA cm –2 and can work steadily for 650 h at 200 mA cm –2 . Remarkably, when coupled with NiFe LDH for overall water splitting, it can drive an AA battery with an ultralow cell voltage of 1.49 V to deliver 10 mA cm –2 . This work sheds new light on designing large-current-density efficient HER electrocatalysts for large-scale industrial applications.
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NiP2@MoO2/Co(Ni)MoO4 micro-flowers on Ni foam exhibit excellent catalytic activity and stability attributed to superaerophobicity with bubble contact angle 149.5 ± 2°, which significantly reduces the size of generated bubbles (decrease from 65 to 125 μm).
“Xu et al. [81] synthesized NiP2@MoO2/Co(Ni)MoO4 micro-flowers on Ni foam, which exhibits excellent catalytic activity and stability. This is attributed to the superaerophobicity of the micro-structure (with the bubble contact angle of 149.5 ± 2°), which significantly reduces the size of the generated bubbles (decrease from 65 to 125 μm) (Fig. 11d).”
From Advances in Surface/Interface Engineering of Under-Water Superaerophobic Electrodes for Hydrogen Evolution Reaction by Manipulating of Bubbles (2026) · cites this paper as [81]
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- Authors
- Xu, Q., Wang, P., Wan, L., Xu, Z., Sultana, M. Z., & Wang, B.
- Affiliations
- State Key Laboratory of Chemical Engineering (CN)
- Corresponding author
- Wang, Baoguo
- Venue
- ACS Applied Materials & Interfaces
- Publisher
- American Chemical Society (ACS)
- Published
- 2022-04-26
- Volume
- 14
- Issue
- 17
- Pages
- 19448-19458
- ISSN
- 1944-8244 (ISSN-L)
- 1944-8252
- OpenAlex
- W4224853199
- Cited by
- 40
- References
- 53
- Citations by year
- 2026: 1 · 2025: 7 · 2024: 12 · 2023: 15 · 2022: 5
- FWCI
- 1.76
- Type
- journal article
- Language
- en
- Open access
- closed
- Licence
- Locations
- ACS Applied Materials & Interfaces (publishedVersion)
- PubMed (publishedVersion)
- Funders
- Ministry of Science and Technology of the People's Republic of China (2018YFE0202001, 2020YFB1505602)
- National Natural Science Foundation of China (201776154)
- 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 › Engineering › Electrical and Electronic Engineering › Fuel Cells and Related Materials
- Keywords
- hydrogen evolution reaction, electrocatalysts, core-shell nanostructures, phosphating, overall water splitting, NiFe layered double hydroxide, high current density, alkaline electrolyte, electrocatalyst stability
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