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<p>Seawater with huge CO<sub>2</sub> sequestration can be a natural electrolyte for electrocatalytic carbon dioxide reduction reaction (CO<sub>2</sub>RR). However, serious problems of hydrogen evolution side reaction and metal corrosion result in low production efficiency and inferior catalyst stability in high salinity seawater electrolysis systems. Herein, a unique island-like electrode is prepared via a two-step modification strategy of displacement by tin (Sn) ion and tannic acid (TA) coordination coating on a zinc (Zn) plate. The fabricated TA@Sn/Zn electrode effectively inhibits the corrosion and reduces the H<sub>2</sub> production, which achieves a maximum Faraday efficiency (FE) for formate of 86.4% at −0.99 V vs. reversible hydrogen electrode (RHE) in 0.1 M KHCO<sub>3</sub> via H-type cell. TA@Sn/Zn also exhibits 85.7% FE<sub>formate</sub> in 3.5 wt% NaCl-simulated seawater and 70% FE<sub>formate</sub> in natural seawater with long-term durability. The experimental and theoretical results reveal that the synergistic modification of Sn active site and protective TA coating on Zn plate decreases the energy barrier of formate generation during CO<sub>2</sub>RR. The present study may provide an effective strategy to obtain corrosion-resistant and formate-selective electrodes for CO<sub>2</sub>RR in seawater.</p>

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Tannic acid-coated Sn/Zn island-like electrodes for the electroreduction of CO2 to formate in seawater

  • 期刊论文

  • 发表日期：

    2025年6月6日

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  • Yang Yang,
  • Hualong Yu,
  • Jingjing Xu,
  • Rui Liu

摘要

Seawater with huge CO2 sequestration can be a natural electrolyte for electrocatalytic carbon dioxide reduction reaction (CO2RR). However, serious problems of hydrogen evolution side reaction and metal corrosion result in low production efficiency and inferior catalyst stability in high salinity seawater electrolysis systems. Herein, a unique island-like electrode is prepared via a two-step modification strategy of displacement by tin (Sn) ion and tannic acid (TA) coordination coating on a zinc (Zn) plate. The fabricated TA@Sn/Zn electrode effectively inhibits the corrosion and reduces the H2 production, which achieves a maximum Faraday efficiency (FE) for formate of 86.4% at −0.99 V vs. reversible hydrogen electrode (RHE) in 0.1 M KHCO3 via H-type cell. TA@Sn/Zn also exhibits 85.7% FEformate in 3.5 wt% NaCl-simulated seawater and 70% FEformate in natural seawater with long-term durability. The experimental and theoretical results reveal that the synergistic modification of Sn active site and protective TA coating on Zn plate decreases the energy barrier of formate generation during CO2RR. The present study may provide an effective strategy to obtain corrosion-resistant and formate-selective electrodes for CO2RR in seawater.