Aqueous CO2 reduction on morphology controlled CuxO nanocatalysts at low overpotential

被引:55
作者
Fan, Mengyang [1 ]
Bai, Zhengyu [2 ]
Zhang, Qing [2 ]
Ma, Chengyu [1 ,3 ]
Zhou, Xiao-Dong [4 ]
Qiao, Jinli [1 ,2 ]
机构
[1] Donghua Univ, Coll Environm Sci & Engn, Shanghai 201620, Peoples R China
[2] Henan Normal Univ, Minist Educ, Sch Chem & Chem Engn, Key Lab Green Chem Media & React, Xinxiang 453007, Henan, Peoples R China
[3] Kashigar Teachers Coll, Dept Chem & Environm Sci, Kashgar 844006, Peoples R China
[4] Univ S Carolina, Dept Chem Engn, Columbia, SC 29208 USA
来源
RSC ADVANCES | 2014年 / 4卷 / 84期
基金
中国国家自然科学基金;
关键词
ELECTROLYTE FUEL-CELLS; ELECTROCHEMICAL REDUCTION; CARBON-DIOXIDE; ELECTROREDUCTION; COPPER; CU2O; CUO; HYDROCARBONS; NANOSPHERES; SELECTIVITY;
D O I
10.1039/c4ra09442e
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Various CuxO catalysts with different special microstructures were synthesized using a simple one-step hydrothermal method by controlling the reaction time and temperature conditions. Scanning electron microscopy (SEM) and high-resolution transmission electron microscopy (HR-TEM) were used to observe the morphologies of the received catalysts. The 3-dimensional (3D) hierarchical nanospheres (500 nm) comprised of secondary structured nanorods (50 nm) are formed at 180 degrees C for 2 hours. However, when increasing the hydrothermal reaction temperature to 220 degrees C, solid microspheres with a large size of 2.5 mu m begin to appear instead of flabby hierarchical nanospheres. To further investigate the effect of morphologies on the activity and production selectivity of CuxO catalysts, cyclic voltammetry (CV) was used to evaluate the onset potential and current density of catalyzed CO2 reduction combining linear sweep voltammetry (LSV) in 0.5 M KHCO3 solution. The effect of catalyst loading was also tested by applying the gas diffusion layer (GDL) to make up a working electrode for CO2 electroreduction. The results indicate that the synthesized temperature of 180 degrees C for 2 h is the optimal condition for CuxO nanospheres and the optimal loading is about 3 mg cm(-2), under which the onset potential for CO2 electroreduction reaches -0.55 V vs. SHE. By ion chromatography measurement, the faradaic efficiency and production rate of produced formate was found to be 59%, which is much higher than most reported Cu-based catalysts at the same electrolysis conditions, indicating the high selectivity of the CuxO nanospheres due to their controlled special surface morphology.
引用
收藏
页码:44583 / 44591
页数:9
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