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Enhancing Hydrogen Evolution Reaction via Synergistic Interaction between the [MoS] Cluster Co-Catalyst and WSe Photocathode. | LitMetric

AI Article Synopsis

Article Abstract

A thiomolybdate [MoS] nanocluster is a promising catalyst for hydrogen evolution reaction (HER) due to the high number of active edge sites. In this work, thiomolybdate cluster films are prepared by spin-coating of a (NH)MoS solution both on FTO glass substrates as hydrogen evolving electrodes and on highly 00.1-textured WSe for photoelectrochemical water splitting. As an electrocatalyst, [MoS] clusters demonstrate a low overpotential of 220 mV at 10 mA cm in 0.5 M HSO electrolyte (pH 0.3) and remain structurally stable during the electrochemical cycling as revealed by in situ Raman spectroscopy. Moreover, as a co-catalyst on WSe, [MoS] clusters enhance the photocurrent substantially by more than two orders of magnitude (from 0.02 to 2.8 mA cm at 0 V vs RHE). The synergistic interactions between the photoelectrode and catalyst, i.e., surface passivation and band bending modification by the [MoS] cluster film, promoted HER catalytic activity of [MoS] clusters influenced by the WSe support, are revealed by intensity-modulated photocurrent spectroscopy and density functional theory calculations, respectively. The band alignment of the WSe/[MoS] heterojunction, which facilitates the electron injection, is determined by correlating UV-vis with photoelectron yield spectroscopy results.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9716521PMC
http://dx.doi.org/10.1021/acsami.2c14312DOI Listing

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