Preparation of C3N4 Thin Films for Photo-/Electrocatalytic CO2 Reduction to Produce Liquid Hydrocarbons

被引:4
|
作者
Zheng, Jin You [1 ]
Pawar, Amol Uttam [2 ]
Kang, Young Soo [2 ]
机构
[1] Zhengzhou Univ, Engn Res Ctr Adv Funct Mat Mfg, Sch Chem Engn, Minist Educ, Zhengzhou 450001, Peoples R China
[2] Korea Inst Energy Technol, Environm & Climate Technol, Naju Si 58219, South Korea
基金
中国国家自然科学基金; 中国博士后科学基金; 新加坡国家研究基金会;
关键词
graphitic carbon nitride; CO2; reduction; thin film; photoelectrochemical property; GRAPHITIC CARBON NITRIDE; BORON-DOPED G-C3N4; ELECTROCHEMICAL REDUCTION; ARTIFICIAL PHOTOSYNTHESIS; FACILE FABRICATION; PHOTOCATALYSTS; HETEROJUNCTION; ELECTRODE; EFFICIENCY; CATALYSIS;
D O I
10.3390/catal12111399
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Thermal vapor condensation of melamine at various temperatures was used to fabricate thin graphitic carbon nitride (g-C3N4) films on fluorine-doped tin oxide (FTO) coated glass substrates. Photoanodic (n-type) and photocathodic (p-type) responses were observed simultaneously in the g-C3N4 films. The g-C3N4 film formed at 520 degrees C with the longest average lifetime of the photo-excited electrons shows the best cathodic photocurrent performance, which was then chosen for electrochemical and photoelectrochemical reduction of CO2. When the basic electrolyte (CO2-saturated 0.5 M KHCO3, pH = 7.6) was adopted, CO2 was electrochemically converted into formaldehyde ((54.6 mu M/h)) in the liquid product. When the acidic electrolyte (CO2-saturated 0.5 M KCl, pH = 4.1) was adopted, formaldehyde (39.5 mu M/h) and ethanol (15.7 mu M/h) were generated through photoelectrochemical reduction, stimulated by the presence of sufficient protons from the electrolyte in the reduction process. Therefore, the pure g-C3N4 film has a great potential for CO2 reduction to value-added liquid hydrocarbons products via electrochemical or photoelectrochemical ways.
引用
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页数:15
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