Solar Driven 15.7% Hydrogen Conversion by Harmony of Light Harvesting, Electron Transporting Bridge, and S-Defection in a Self-Assembled Microscale CuS/rGO/CP Photoanode

Sujeong Kim; Boseok Seo; Hyerim Park; Younghwan Im; Jeong Yeon Do; Byung Sub Kwak; Namgyu Son; Minkyu Kim; Misook Kang

doi:10.1002/eem2.12631

Energy & Environmental Materials ›› 2024, Vol. 7 ›› Issue (3) :12631 DOI: 10.1002/eem2.12631

RESEARCH ARTICLE

Solar Driven 15.7% Hydrogen Conversion by Harmony of Light Harvesting, Electron Transporting Bridge, and S-Defection in a Self-Assembled Microscale CuS/rGO/CP Photoanode

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Abstract

CuS is an encouraging photoelectrode candidate that meets the essential requirements for efficient solar-to-hydrogen production, but it has not been thoroughly studied. A CuS light absorber layer is grown by the self-assembly of copper and sulfur precursors on a carbon paper (CP) electrode. Simultaneously, rGO is introduced as a buffer layer to control the optical and electrical properties of the absorber. The well-ordered microstructural arrangement suppresses the recombination loss of electrons and holes owing to enhanced charge-carrier generation, separation, and transport. The potential reaching 10 mA cm⁻² in 1.0 M KOH solution is significantly lowered to 0.87 V, and the photocurrent density at 1.23 V is 94.7 mA cm⁻². The computational result reveals that the potential-determining step is sensitive to O* stability; the lower stability of O* in the thin layer of CuS/rGO decreases the free-energy gap between the initial and final states of the potential-determining step, resulting in a lowering of the onset potential. The faradaic efficiency for the photoelectrochemical oxygen evolution reaction in the optimized 2CuS/1rGO/CP photoanode is 98.60%, and the applied bias photon-to-current and the solar-to-hydrogen efficiencies are 11.2% and 15.7%, respectively, and its ultra-high performance is maintained for 250 h. These record-breaking achievement indices may be a trigger for establishing a green hydrogen economy.

Keywords

15.7%-solar to hydrogen / density functional theory / lower photopotential / p-CuS/rGO/CP photoanode / photoelectrochemical oxygen evolution

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Sujeong Kim, Boseok Seo, Hyerim Park, Younghwan Im, Jeong Yeon Do, Byung Sub Kwak, Namgyu Son, Minkyu Kim, Misook Kang. Solar Driven 15.7% Hydrogen Conversion by Harmony of Light Harvesting, Electron Transporting Bridge, and S-Defection in a Self-Assembled Microscale CuS/rGO/CP Photoanode. Energy & Environmental Materials, 2024, 7(3): 12631 DOI:10.1002/eem2.12631

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