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The enhanced photocatalytic hydrogen production over hollow spherical core-shell Co9S8@ZnIn2S4 ohmic junction

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  • Lao, Yonghe
  • Ji, Shuo
  • Zhang, Yushen
  • Cui, Lishuang
  • Shi, Lei

Abstract

Developing low-cost photocatalysts with efficient charge separation and stable visible-light activity is crucial for solar-driven hydrogen production. Here we report a hollow core–shell Co9S8@ZnIn2S4 composite with an ohmic contact, prepared to enhance interfacial charge transfer. The hollow architecture increases the accessible surface area and exposes more active sites, while facilitating the separation and transport of photogenerated carriers. Among the samples, the 25 wt% Co9S8 loaded Co9S8@ZnIn2S4 (25-CoS@ZIS) showed the best performance. Without any noble-metal co-catalyst, 25-CoS@ZIS delivered a hydrogen evolution rate of 8612.5 μmol h−1 g−1, which was 2.85 times that of pristine ZnIn2S4 (3025.0 μmol h−1 g−1), and maintained stable activity and structural integrity during cycling. The composite also showed efficient hydrogen evolution in simulated seawater as well as groundwater and tap water, supporting its potential for practical use. Mechanistic insights were obtained by combining experimental characterization with theoretical calculations, highlighting the role of the ohmic interface and hollow structure in promoting charge separation and utilization.

Suggested Citation

  • Lao, Yonghe & Ji, Shuo & Zhang, Yushen & Cui, Lishuang & Shi, Lei, 2026. "The enhanced photocatalytic hydrogen production over hollow spherical core-shell Co9S8@ZnIn2S4 ohmic junction," Renewable Energy, Elsevier, vol. 264(C).
    • Handle: RePEc:eee:renene:v:264:y:2026:i:c:s0960148126003873
    DOI: 10.1016/j.renene.2026.125562
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