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<p>It has made significant progress in catalyst and reactor design for commercial current densities in CO<sub>2</sub> electroreduction (CO<sub>2</sub>ER). However, these catalyst systems have rarely been applied for a C<sub>2</sub> gas product of ethane due to its commonly inferior selectivity relative to other C<sub>1</sub> and C<sub>2</sub> products. Herein, bamboo-like amorphous Ni(OH)<sub>2</sub> nanotubes wrapped Cu nanoparticles composite (Cu NPs@a-Ni(OH)<sub>2</sub> NTs) is constructed for selective CO<sub>2</sub>ER to ethane in a flow cell. The unique Cu NPs@a-Ni(OH)<sub>2</sub> NTs structure provides a confined geometry to improve the adsorption of the reactive species. The interface of Cu NPs and a-Ni(OH)<sub>2</sub> NTs is stabilized by generating some NiOH species. The produced Cu@NiOH interface enhances the activation of CO<sub>2</sub> to *C*OOH and strengthens the adsorption of *CO<sub>L</sub> on Cu site for more *COH formation and its dimerization for final ethane production. Meanwhile, amorphous Ni(OH)<sub>2</sub> nanotubes promote water dissociation for the hydrogenation of carbonous intermediates, contributing to ethane production. The synthesized Cu NPs@a-Ni(OH)<sub>2</sub> NTs can reach a Faradaic efficiency of 48.3% and a partial current density of −226.7 mA cm<sup>−2</sup> for ethane at −0.7 V in a flow cell, with a remarkable stability for 24 h. This work provides a rational strategy to engineer Cu-based composite for selective CO<sub>2</sub>ER to ethane in a flow cell.</p>

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Bamboo-like amorphous Ni(OH)2 nanotubes wrapped Cu nanoparticles with a confined geometry for CO2 electroreduction to ethane in a flow cell

  • 期刊论文

  • 发表日期：

    2025年1月2日

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  • Xiangyu Wang,
  • Weipei Sun,
  • Peng Wang,
  • Tian Sheng,
  • Feng Gao,
  • Zhengcui Wu

摘要

It has made significant progress in catalyst and reactor design for commercial current densities in CO2 electroreduction (CO2ER). However, these catalyst systems have rarely been applied for a C2 gas product of ethane due to its commonly inferior selectivity relative to other C1 and C2 products. Herein, bamboo-like amorphous Ni(OH)2 nanotubes wrapped Cu nanoparticles composite (Cu NPs@a-Ni(OH)2 NTs) is constructed for selective CO2ER to ethane in a flow cell. The unique Cu NPs@a-Ni(OH)2 NTs structure provides a confined geometry to improve the adsorption of the reactive species. The interface of Cu NPs and a-Ni(OH)2 NTs is stabilized by generating some NiOH species. The produced Cu@NiOH interface enhances the activation of CO2 to *C*OOH and strengthens the adsorption of *COL on Cu site for more *COH formation and its dimerization for final ethane production. Meanwhile, amorphous Ni(OH)2 nanotubes promote water dissociation for the hydrogenation of carbonous intermediates, contributing to ethane production. The synthesized Cu NPs@a-Ni(OH)2 NTs can reach a Faradaic efficiency of 48.3% and a partial current density of −226.7 mA cm−2 for ethane at −0.7 V in a flow cell, with a remarkable stability for 24 h. This work provides a rational strategy to engineer Cu-based composite for selective CO2ER to ethane in a flow cell.