期刊
ACS APPLIED ENERGY MATERIALS
卷 5, 期 4, 页码 4564-4576出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsaem.2c00009
关键词
photothermal catalysis; water splitting; hydrogen production; Cu-modified TiO2; solar energy
资金
- National Natural Science Foundation of China [51976190, LR18E060001]
Wasted high-temperature water can be used for photothermal catalytic water splitting reactions to produce solar fuel and provide high-temperature heat. Cu-modified TiO2 improves the photoresponse and promotes the water splitting reaction. Increasing temperature reduces the energy barrier and charge-transfer resistance, leading to increased hydrogen yield.
Wasted high-temperature water from power plants or industrial boilers for photothermal catalytic water splitting reactions may be used to produce solar fuel and provide high-temperature heat to achieve solar-energy cascade utilization. Cu-modified TiO2 was used for the overall photothermal catalytic water splitting reaction, resulting in a hydrogen-oxygen ratio of approximately 2:1. The liquid-solid interface reaction yield was up to 10 times that of the gas-solid interface at the same reaction temperature. With the Cu modification, the photoresponse was improved, the energy barrier of the rate-determining step was reduced, and the water splitting reaction was promoted. As the copper content increased, Cu elements changed from a low valence state to an oxidized state. Moreover, the effect of temperature on the reaction was also explored. Increasing the temperature reduced the energy barrier of the rate-determining step and reduced the charge-transfer resistance, which explains the positive correlation between the hydrogen yield and temperature.
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