Hierarchical triphase diffusion photoelectrodes for photoelectrochemical gas/liquid flow conversion

Xiangyu Meng, Chuntong Zhu, Xin Wang, Zehua Liu, Mengmeng Zhu, Kuibo Yin, Ran Long, Liuning Gu, Xinxing Shao, Litao Sun, Yueming Sun, Yunqian Dai () and Yujie Xiong ()
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Xiangyu Meng: Southeast University
Chuntong Zhu: Southeast University
Xin Wang: Anhui Normal University
Zehua Liu: University of Science and Technology of China
Mengmeng Zhu: Southeast University
Kuibo Yin: Southeast University
Ran Long: University of Science and Technology of China
Liuning Gu: Southeast University
Xinxing Shao: Southeast University
Litao Sun: Southeast University
Yueming Sun: Southeast University
Yunqian Dai: Southeast University
Yujie Xiong: Anhui Normal University

Nature Communications, 2023, vol. 14, issue 1, 1-13

Abstract: Abstract Photoelectrochemical device is a versatile platform for achieving various chemical transformations with solar energy. However, a grand challenge, originating from mass and electron transfer of triphase—reagents/products in gas phase, water/electrolyte/products in liquid phase and catalyst/photoelectrode in solid phase, largely limits its practical application. Here, we report the simulation-guided development of hierarchical triphase diffusion photoelectrodes, to improve mass transfer and ensure electron transfer for photoelectrochemical gas/liquid flow conversion. Semiconductor nanocrystals are controllably integrated within electrospun nanofiber-derived mat, overcoming inherent brittleness of semiconductors. The mechanically strong skeleton of free-standing mat, together with satisfactory photon absorption, electrical conductivity and hierarchical pores, enables the design of triphase diffusion photoelectrodes. Such a design allows photoelectrochemical gas/liquid conversion to be performed continuously in a flow cell. As a proof of concept, 16.6- and 4.0-fold enhancements are achieved for the production rate and product selectivity of methane conversion, respectively, with remarkable durability.

Date: 2023
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DOI: 10.1038/s41467-023-38138-9

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