Cited by 40Electrocatalysts for Energy ConversionCO2 Reduction Techniques and CatalystsFuel Cells and Related Materials

Superhydrophilic/Superaerophobic Hierarchical NiP2@MoO2/Co(Ni)MoO4 Core–Shell Array Electrocatalysts for Efficient Hydrogen Production at Large Current Densities

Xu, Qin, Wang, Peican, Wan, Lei, Xu, Ziang, Sultana, Mst Zakia, Wang, Baoguo·2022·ACS Applied Materials & Interfaces

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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Crossref · 10.1021/acsami.2c01808

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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).”

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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
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
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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