石墨烯
材料科学
光催化
氧化物
阳极
阴极
纳米技术
化学工程
二氧化碳电化学还原
电极
光电流
图层(电子)
光电子学
催化作用
化学
一氧化碳
生物化学
物理化学
工程类
冶金
作者
Yuhan Liu,Jing Shang,Tong Zhu
标识
DOI:10.1016/j.apsusc.2023.158196
摘要
Photoelectric co-catalysis is a promising method for carbon dioxide (CO2) reduction due to its greater flexibility and higher reaction efficiency. However, the development of gas-phase photoelectrocatalysis is still in progress. Additionally, there is limited information available regarding the intrinsic photocatalytic capability of reduced graphene oxide (RGO) and its "structure-activity" relationship. In this study, solid planar photoelectrocatalytic (PEC) devices ITO/RGO/ITO were designed to enable gas-solid PEC CO2 reduction. The device consists of two strip electrodes functioning as the cathode and anode, biased to create a horizontal electric field that facilitates the separation of photogenerated electron-hole pairs. RGO-130 (heat treatment at 130 °C) presented the best PEC CO2 reduction efficiency, 2.2 times higher than photocatalysis under visible light irradiation. This enhancement can be attributed to its moderate oxygen content (48.8%), 001 crystal face and "layer upon layer" structure, all of which facilitate the separation and transfer of photogenerated carriers. Therefore, RGO is capable of acting as a stand-alone catalyst for the photocatalytic CO2 reduction, and the appropriate design of RGO in surface and structure can improve its activity. This work provides a new perspective on research and application of PEC CO2 reduction, in view of its environmentally safe and conducive to large-scale applications.
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