Abstract:

The energy utilization of CO₂ by chemical conversion faces two problems of energy consumption and hydrogen source. Photoelectrocatalytic technology is a new and clean way to realize the energy utilization of CO₂, which can reduce the external energy input and improve the selectivity and controllability of the CO₂ reduction products by excitation electron of photocatalyst and electrocatalysis. In this paper, the research progress of photoelectrocatalytic carbon dioxide is reviewed from the advantages of photoelectrocatalytic process, reaction mechanism, catalysts and the latest research results. We mainly elaborate the composition of the photoelectrocatalytic system, the electronic reduction of CO₂, and the existing problems. Besides, we mainly discuss on the influence of the compositions of the electrode material and the electrolyte, and the types of commonly used photocatalysts on the catalytic performance of the entire photoelectrocatalytic system. In addition, it points out that the current photoelectrocatalytic utilization of CO₂ has problems of insufficient conversion efficiency, poor product selectivity, and etc. Future research should focus on the development of high-efficiency photoelectrocatalysts and the catalytic kinetics.

Key words: carbon dioxide, energy utilization, photoelectrocatalysis, photoelectrocatalytic system, reaction mechanism

摘要：

CO₂能源化利用面临的主要问题是能耗问题和氢源问题。光电催化实现CO₂的能源化利用的核心为利用光催化剂的催化活性，光激发条件下产生光电子，减少外界能量输入，同时利用电催化活性提高CO₂还原产物的选择性和可控性。文章主要从光电催化的优势、反应机理、研究现状、催化剂、最新研究成果等方面综述了光电催化CO₂能源化利用的研究进展。具体阐述了光电催化体系的组成、CO₂的电子还原过程及目前存在的问题，重点探讨了光电体系的电极材料组成、电解液组分以及常见的光电催化剂类型对整个光电催化体系催化性能的影响。此外，指出了当前光电催化CO₂能源化利用方面存在的不足：转化效率低、产物选择性差等。并对光电催化实现CO₂能源化利用的研究重点，即高效光电催化剂的开发、催化过程动力学反应机理进行了展望。

关键词: 二氧化碳, 能源化利用, 光电催化, 光电催化体系, 反应机理