Citation: Xudong Lv, Tao Shao, Junyan Liu, Meng Ye, Shengwei Liu. 电催化CO₂还原耦合HCHO氧化反应系统促进污染物同步经济高效资源化转化[J]. Acta Physico-Chimica Sinica, ;2024, 40(5): 230502. doi: 10.3866/PKU.WHXB202305028 shu

电催化CO₂还原耦合HCHO氧化反应系统促进污染物同步经济高效资源化转化

Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510006, China

Received Date: 15 May 2023
Revised Date: 27 May 2023
Accepted Date: 27 May 2023

Fund Project: This project was supported by the National Natural Science Foundation of China (51872341), the Tip-top Scientific and Technical Innovative Youth Talents of Guangdong Special Support Program, China (2019TQ05L196) and the Science and Technology Planning Project of Guangdong Province, China (2021A1515010147).

传统电化学CO₂还原(CO₂RR)系统中阳极发生的水氧化半反应(WOR)具有动力学缓慢、过电位大、能耗高等缺点，限制了CO₂RR系统的经济效益和应用。因此，本研究引入MnO₂阳极进行甲醛氧化半反应(FOR)以代替WOR，构建了一种新型CO₂RR/FOR耦合系统。与传统的CO₂RR/WOR系统相比，在相同的施加电势下，CO₂RR/FOR耦合系统的CO₂RR电流密度和CO₂RR产物的生成速率通常更具有优势。此外，在CO₂RR/FOR耦合系统中，在合适的施加电势下，HCHO可以选择性地转化为HCOOH。具体来说，两电极CO₂RR/FOR耦合系统中，在3.5 V的槽电压下，近90%的HCHO可以被去除，且HCHO会选择性转化为HCOOH，其转化率约为48%。更重要的是，在不同的工作电流下，FOR所需的电势比WOR所需的电势要小。在-10 mA·cm^-2时，CO₂RR/FOR耦合系统能降低约210 mV的槽电压，并且其能耗比单独的CO₂RR系统和FOR系统的能耗之和降低45.13%。值得注意的是，当使用商业多晶硅太阳能电池作为电源时，在CO₂RR/FOR耦合系统中的CO₂RR电流密度、CO₂RR产物的生成速率和HCHO到HCOOH的选择性仍然可以实现相当的改善。目前的工作将进一步推动研究开发新型的CO₂RR耦合系统，以经济有效地将CO₂和有机污染物同时转化为有价值的化学品。
- CO₂ reduction,
- HCHO oxidation,
- Paired electrochemical system,
- Cu,
- MnO₂
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电催化CO2还原耦合HCHO氧化反应系统促进污染物同步经济高效资源化转化

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电催化CO₂还原耦合HCHO氧化反应系统促进污染物同步经济高效资源化转化