Investigation on Polymer Electrolyte Membrane-Based Electrochemical Dehumidification with Photoelectro-Catalyst Anode for Air-Conditioning
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Buildings in Southern China require a large amount of energy to handle indoor humidity. As a novel technology, dehumidification with polymer electrolyte membrane (PEM) can remove air moisture using an electric field, without cooling water or absorbents. This study proposed a PEM-based dehumidification element that had simultaneous water electrolysis and photolysis capacities, which could be operated under the joint drive of electricity and solar UV. This element is suitable to be integrated with building envelopes for further energy saving. Several photocatalysts were prepared, including Pt/TiO2, IrO2/TiO2 and IrTiOx (IrO2:TiO2 = 2:3), and their photocatalytic properties were measured. Result showed that among these catalysts, under the irradiation of a 300 w xenon lamp, Pt/TiO2 had the best water photolysis effect, while the durability of Pt under higher current density was poor. The photolysis effect of IrTiOx was close to that of Pt/TiO2, and IrO2 had good catalytic performance and stability in electrolysis. This research helps to improve dehumidification efficiency. More importantly, it attempts a brand-new exploration in the artificial photosynthesis and even power generation relying on humidity difference.
KeywordsElectrochemical dehumidification Water decomposition Photoelectro-catalyst Material preparation
The project is supported by the National Natural Science Foundation of China (51876067), the Natural Science Fund for Distinguished Young Scholars of Guangdong Province (2018B030306014). It is also supported by the Science and Technology Planning Project of Guangdong Province: Guangdong-Hong Kong Technology Cooperation Funding Scheme (TCFS), No.2017B050506005.
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