Scholarlink

<p>As an integrated CO<sub>2</sub> capture and utilization (ICCU) process, direct electrochemical reduction of amine captured-CO<sub>2</sub> reduction reaction (cCO<sub>2</sub>RR) has enormous advantages in energy efficiency and operating cost. The low product selectivity is an urgent issue. Here, we found that the hydroxyl (-OH) on CeO<sub>2</sub> can significantly enhance CO selectivity. After hydroxyl modification, the CO faraday efficiency (FE<sub>CO</sub>) was surprisingly increased by 188% (relative increase rate). The correlation coefficient between -OH quantity and FE<sub>CO</sub> is as high as 0.98. Further study indicated that the presence of -OH can lead to a more compact electrochemical double layer (EDL) and charge transfer resistance by proton transfer. The -OH can also enhance CO<sub>2</sub> adsorption and stabilize the intermediate species (*COOH). DFT results further demonstrate that the rate-determining step was proton transfer from the surface -OH to MEACOO<sup>−</sup>, -OH modification can reduce the energy barrier to as low as 0.39&#xa0;eV. This work provides additional insights into improving selectivity in amine-based cCO<sub>2</sub>RR, advancing the development of ICCU technology.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Crucial role of hydroxyl in CO selectivity for integrated CO2 capture and electrocatalytic reduction

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年1月7日

查看全文
  • Shaona Wang,
  • Yang Yang,
  • Wenqing Xu,
  • Zhuoshu Bai,
  • Fabing Su,
  • Yixi Wang,
  • Dingrong Bai,
  • Tingyu Zhu

摘要

As an integrated CO2 capture and utilization (ICCU) process, direct electrochemical reduction of amine captured-CO2 reduction reaction (cCO2RR) has enormous advantages in energy efficiency and operating cost. The low product selectivity is an urgent issue. Here, we found that the hydroxyl (-OH) on CeO2 can significantly enhance CO selectivity. After hydroxyl modification, the CO faraday efficiency (FECO) was surprisingly increased by 188% (relative increase rate). The correlation coefficient between -OH quantity and FECO is as high as 0.98. Further study indicated that the presence of -OH can lead to a more compact electrochemical double layer (EDL) and charge transfer resistance by proton transfer. The -OH can also enhance CO2 adsorption and stabilize the intermediate species (*COOH). DFT results further demonstrate that the rate-determining step was proton transfer from the surface -OH to MEACOO−, -OH modification can reduce the energy barrier to as low as 0.39 eV. This work provides additional insights into improving selectivity in amine-based cCO2RR, advancing the development of ICCU technology.