Fabrication and Modification of Ferrite Photocathodes for Photoelectrochemical Water Splitting
Xin Ni , Yang Zhou , Ruiqin Tan , Yongbo Kuang
Progress in Chemistry ›› 2020, Vol. 32 ›› Issue (10) : 1515 -1534.
A non-biased photoelectrochemical (PEC) cell composed of both an n-type semiconductor photoanode and a p-type semiconductor photocathode offers a cost-effective route to convert water directly into high energy density hydrogen using solar energy, which helps address the intermittency and storage problem of solar energy during utilization. Metal oxide semiconductors have the advantages of low cost and facile preparation. Compared with well-developed n-type metal oxide photoanode materials, the stability of conventional p-type metal oxide photocathode materials still remains a challenge due to the photoelectrochemical reduction of metallic ions. As a new type of metal oxide photocathodes, ferrite photocathodes have recently emerged as competitive candidates for practical applications due to the appropriate band gaps, better photostability, higher onset potential and relatively low preparation costs. In this review, the fundamentals of PEC water splitting and common methods for improving performance of photoelectrodes are first introduced, and the recent progress of representative CuFeO2, CaFe2O4 and LaFeO3 photocathodes are summarized, including their fabrication methods, elements doping and surface modifications. Finally, perspectives on the future development of ferrite photocathodes are also discussed.
1 Introduction
2 Fundamentals of PEC water splitting
2.1 Composition and configuration of a non-biased PEC cell
2.2 Process of PEC water splitting
2.3 Semiconductor-electrolyte junction
2.4 Requirements for band gaps and positions of photoelectrode materials
3 Methods for improving conversion efficiency of photoelectrodes
3.1 Enhancing generation rates of carriers
3.2 Promoting bulk transport and separation efficiency of carriers
3.3 Accelerating surface injection efficiency of carriers
4 Recent progress of ferrite photocathodes
4.1 Recent status of PEC water splitting materials
4.2 CuFeO2
4.3 CaFe2O4
4.4 LaFeO3
5 Conclusion and outlook
photoelectrochemistry / ferrite photocathode / water splitting / fabrication / modification
National Natural Science Foundation of China(21805298)
National Natural Science Foundation of China(21905288)
National Natural Science Foundation of China(51904288)
Ningbo Major Special Projects of the Plan “Science and Technology Innovation 2025”(2018B10056)
Ningbo 3315 Program, and K.C. Wong Magna Fund in Ningbo University.
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