Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 13, Issue 18, Pages 21207-21216Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.1c01108
Keywords
interfacial photocatalysis; energy flow; mass flow; photothermal; hydrogen evolution
Funding
- National Natural Science Foundation of China [51872138]
- Natural Science Foundation of Jiangsu Province [BK20181380]
- Key University Science Research Project of Jiangsu Province [15KJB430022]
- Six Talent Peaks Project in Jiangsu Province [XCL-029]
- China Postdoctoral Science Foundation [2020M681564]
- Postgraduate Research & Practice Innovation Program of Jiangsu Province [KYCX18_1084]
- Priority Academic Program Development of the Jiangsu Higher Education Institutions (PAPD)
- Qing Lan Project
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The study introduces an interfacial photocatalytic mode to optimize energy and mass transfer in photocatalytic water splitting, leading to improved energy conversion efficiency and hydrogen production rate by constructing low-loss pathways and efficient heat localization zones.
Energy and mass transfer in photocatalytic systems plays a significant role in photocatalytic water splitting, but relevant research has long been ignored. Here, an interfacial photocatalytic mode for photocatalytic hydrogen production is exploited to optimize the energy and mass flows and mainly includes a heat-insulating layer, a water-channel layer, and a photothermal photocatalytic layer. In this mode, the energy flow is optimized for efficient spreading, conversion, and utilization. A low-loss path (ultrathin water film) and an efficient heat localized zone are constructed, where light energy, especially infrared-light energy, can transfer to the target functional membrane surface with low loss and the thermal energy converted from light can be localized for further use. Meanwhile, the optimization of the mass flow is achieved by improving the desorption capacity of the products. The generated hydrogen bubbles can rapidly leave from the surface of the photocatalyst, along with the active sites being released timely. Consequently, the photocatalytic hydrogen production rate can be increased up to about 6.6 times that in a conventional photocatalytic mode. From the system design aspect, this work provides an efficient strategy to improve the performance of photocatalytic water splitting by optimizing the energy and mass flows.
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