Unveiling the influence of 5,10,15,20-tetrakis (4-carboxyl phenyl) porphyrin on the photogenerated charge behavior and photoelectrochemical water oxidation of hematite photoanode

Qijing Bu; Xiangwei Liu; Qifeng Zhao; Guang Lu; Xixi Zhu; Qingyun Liu; Tengfeng Xie

doi:10.1016/j.jcis.2022.06.084

Unveiling the influence of 5,10,15,20-tetrakis (4-carboxyl phenyl) porphyrin on the photogenerated charge behavior and photoelectrochemical water oxidation of hematite photoanode

J Colloid Interface Sci. 2022 Nov 15:626:345-354. doi: 10.1016/j.jcis.2022.06.084. Epub 2022 Jun 23.

Authors

Qijing Bu¹, Xiangwei Liu², Qifeng Zhao², Guang Lu², Xixi Zhu², Qingyun Liu³, Tengfeng Xie⁴

Affiliations

¹ College of Energy and Mining Engineering, Shandong University of Science and Technology, Qingdao 266590, PR China; College of Chemical and Biological Engineering, Shandong University of Science and Technology, Qingdao 266590, PR China.
² College of Chemical and Biological Engineering, Shandong University of Science and Technology, Qingdao 266590, PR China.
³ College of Energy and Mining Engineering, Shandong University of Science and Technology, Qingdao 266590, PR China; College of Chemical and Biological Engineering, Shandong University of Science and Technology, Qingdao 266590, PR China. Electronic address: qyliu@sdust.edu.cn.
⁴ College of Chemistry, Jilin University, Changchun 130012, PR China. Electronic address: xietf@jlu.edu.cn.

PMID: 35792465
DOI: 10.1016/j.jcis.2022.06.084

Abstract

Coupling porphyrins with semiconductors is demonstrated as one of effective means to facilitate the separation of photogenerated charge in dye-sensitized solar cells as well as photocatalytic hydrogen production. However, there are limited reports about exploring the effect of porphyrin on the behavior of photogenerated charges and photoelectrochemical (PEC) water oxidation performance. Herein, we have built a hybrid photoanode containing Ti doped α-Fe₂O₃ (Ti-Fe₂O₃), 5,10,15,20-tetrakis (4-carboxyl phenyl) porphyrin (H₂TCPP) and cobalt phosphate (CoPi) cocatalyst. Because of the appropriate band alignment of Ti-Fe₂O₃, H₂TCPP and CoPi, the photogenerated holes are transferred directionally from Ti-Fe₂O₃ to CoPi across H₂TCPP, which boosts the separation efficiency of CoPi/H₂TCPP/Ti-Fe₂O₃ in turn. Meanwhile, CoPi/H₂TCPP/Ti-Fe₂O₃ possesses higher injection efficiency as well. Under the double guarantee of high separation efficiency and injection efficiency, CoPi/H₂TCPP/Ti-Fe₂O₃ yields an impressive photocurrent density of 1.84 mA/cm² at 1.23 V vs. reversible hydrogen electrode (RHE), which is much higher than that of CoPi/Ti-Fe₂O₃. This structure design describes an appealing maneuver to facilitate the directed migration of photogenerated charges and then enhance the PEC water oxidation performance.

Keywords: Photoanode; Photoelectrochemical water oxidation; Photogenerated charge behavior; Porphyrin; α-Fe(2)O(3).