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<p>Copper sulfide (CuS<sub>x</sub>) is an electrocatalyst which selectively converts CO<sub>2</sub> into HCOOH under harsh conditions. Here, we investigate the formation and kinetics of CuS<sub>x</sub> nanostructures on various multi-metal substrates to understand their catalytic properties in sulfur-containing environments. Using a combination of morphological, structural, and electrochemical analyses, we elucidate the time-dependent growth behavior of CuS<sub>x</sub> nanostructures with progressive void formation over time. Notably, we discover that CuS<sub>x</sub> formation is accelerated on substrates with galvanic corrosion-promoting metals such as Ag and Au, leading to enhanced selectivity for HCOOH during CO<sub>2</sub> reduction. In contrast, coating Cu with corrosion-inhibiting metals like Sn, Ni, or In reduce HCOOH selectivity, highlighting the critical role of galvanic corrosion in the CuS<sub>x</sub> formation mechanism and its kinetics. This study experimentally identifies the impact of galvanic corrosion on CuS<sub>x</sub> formation mechanisms and offers insights for optimizing electrocatalytic systems.</p> Graphical Abstract <p></p>

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Kinetic Investigation of CuSx Formation on Cu Substrates for Enhanced Electrochemical CO2 Reduction to HCOOH

  • 期刊论文

  • 发表日期：

    2025年2月13日

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  • Jin Wook Lim,
  • Won Seok Cho,
  • Jong-Lam Lee

摘要

Copper sulfide (CuSx) is an electrocatalyst which selectively converts CO2 into HCOOH under harsh conditions. Here, we investigate the formation and kinetics of CuSx nanostructures on various multi-metal substrates to understand their catalytic properties in sulfur-containing environments. Using a combination of morphological, structural, and electrochemical analyses, we elucidate the time-dependent growth behavior of CuSx nanostructures with progressive void formation over time. Notably, we discover that CuSx formation is accelerated on substrates with galvanic corrosion-promoting metals such as Ag and Au, leading to enhanced selectivity for HCOOH during CO2 reduction. In contrast, coating Cu with corrosion-inhibiting metals like Sn, Ni, or In reduce HCOOH selectivity, highlighting the critical role of galvanic corrosion in the CuSx formation mechanism and its kinetics. This study experimentally identifies the impact of galvanic corrosion on CuSx formation mechanisms and offers insights for optimizing electrocatalytic systems.

Graphical Abstract