Photoactivated Graphene Oxide to Enhance Photocatalytic Reduction of CO2

被引:101
|
作者
Kuang, Yu [1 ]
Shang, Jing [1 ]
Zhu, Tong [1 ,2 ]
机构
[1] Peking Univ, Coll Environm Sci & Engn, State Key Joint Lab Environm Simulat & Pollut Con, 5 Yiheyuan Rd, Beijing 100871, Peoples R China
[2] Peking Univ, BIC ESAT, 5 Yiheyuan Rd, Beijing 100871, Peoples R China
基金
中国国家自然科学基金;
关键词
graphene oxide; photoactivation; defect density; pi-conjugation; photocatalysis; CO2; reduction; GRAPHITE OXIDE; HIGHLY EFFICIENT; CARBON-DIOXIDE; PHOTOREDUCTION; FUELS; WATER; TRANSFORMATION; SUSPENSIONS; GENERATION; NANOSHEETS;
D O I
10.1021/acsami.9b18899
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
Graphene oxide (GO) is commonly used in photocatalytic reactions but mainly as a cocatalyst. Limited information is available on the intrinsic ability of GO to photocatalytically reduce CO2 as a sole photocatalyst and the activation of light irradiation. In this study, simulated sunlight (SS) and UV-irradiated GO (GO(SS) and GO(UV), respectively) showed enhanced efficiency of photocatalytic reduction of CO2 compared to pristine GO, with a CO yield (4 h) ratio of GO(SS)/GO(UV)/GO of 2.7:2.1:1. Here, irradiation plays two important roles: (1) irradiating GO to eliminate CO released under photolysis from photocatalytic reactions and (2) activating GO to create defects and restore the large pi-conjugated network, obtaining photolysis- saturated and photoactivated GO for photocatalytic reduction of CO2. The increasing defect density and it conjugation of irradiated GO, as supported by X-ray photoelectron and Raman spectroscopy, improve the yield of photoelectrons and prolong the lifetime of photogenerated charge carriers, as supported by electron spin resonance and transient absorption spectroscopy. This results in an enhanced photocatalytic efficiency of irradiated GO. The higher CO yield of GO(SS) compared to GO(UV) indicates that simulated sunlight irradiation is more favorable for GO activation. Our results show that activating GO under irradiation enhances the photocatalytic reduction of CO2.
引用
收藏
页码:3580 / 3591
页数:12
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