Citation: Huasen Lu, Shixu Song, Qisen Jia, Guangbo Liu, Luhua Jiang. Advances in Cu₂O-based Photocathodes for Photoelectrochemical Water Splitting[J]. Acta Physico-Chimica Sinica, ;2024, 40(2): 230403. doi: 10.3866/PKU.WHXB202304035 shu

Advances in Cu₂O-based Photocathodes for Photoelectrochemical Water Splitting

Nano Materials and Electrocatalysis Laboratory, College of Materials Science and Engineering, Qingdao University of Science and Technology, Qingdao 266042, Shandong Province, China

Corresponding author: Luhua Jiang, luhuajiang@qust.edu.cn
Received Date: 20 April 2023
Revised Date: 21 May 2023
Accepted Date: 23 May 2023
Available Online: 31 May 2023
Fund Project: the National Natural Science Foundation of China 22179067the National Natural Science Foundation of China 22279069the Natural Science Foundation of Shandong Province ZR2022ZD10

Owing to the growing consumption of non-renewable resources and increased environmental pollution, significant attention has been directed toward developing renewable and environmentally friendly energy sources. Hydrogen has emerged as a clean energy carrier and is considered an ideal chemical for power generation via fuel cells. Using renewable energy to power hydrogen production is an attractive prospect, and hydrogen production through photoelectrochemical water splitting is considered a promising area of interest; consequently, significant research is being conducted on rationally designed photoelectrodes. Generally, a photocathode for hydrogen evolution must have a conduction band that is more negative than the reduction potential of hydrogen. Numerous photocathode materials have been developed based on this premise; these include p-Si, InP, and GaN. Compared with other photocathode materials, Cu-based compounds are advantageous owing to their low preparation costs and diverse chemical states. For example, Cu₂O is a non-toxic p-type metal oxide semiconductor material with an appropriate band structure for water splitting and a direct band gap of 1.9–2.2 eV. Furthermore, the production of Cu₂O is facile, and the required materials are abundant; thus, it has attracted significant interest as a material for photocathodes. However, Cu₂O suffers from rapid recombination of photogenerated carriers and severe photo-corrosion, leading to unsatisfactory efficiency and poor stability. Intrinsically, the poor photo-stability of Cu₂O can be attributed to the location of the redox potential of Cu₂O within its bandgap, owing to which photoelectrons tend to preferentially reduce Cu₂O to Cu rather than reduce water to reduction. Therefore, Cu₂O itself is not an ideal hydrogen evolution catalyst. Thus, co-catalysts are necessary to improve its hydrogen evolution activity and photostability. In addition to co-catalysts, combining Cu₂O with tailored n-type semiconductors to generate built-in electric fields of p-n junctions has attracted extensive attention owing to its ability of increasing the separation of photogenerated carriers. Similarly, applying a hole transfer layer on the substrate can promote photocarrier separation. Furthermore, considering that water is indispensable for Cu₂O reduction, one effective approach to improve the stability of Cu₂O is the addition of a protective/passivation layer to isolate Cu₂O from water in aqueous electrolytes. In this review, we provide a brief overview of the mechanism of photoelectrochemical water splitting and the band structure of Cu2O; preparation methods of Cu₂O photocathodes; strategies to improve the efficiency and stability of Cu₂O photocathodes, including the construction of p-n junctions, integration with co-catalysts, and modifications using hole transport layers; advanced photoelectrochemical characterization techniques; and a discussion regarding the direction of future photocathode research.
- Photoelectrocatalysis,
- Cuprous oxide,
- Hydrogen evolution reaction,
- Photocathode,
- Water splitting
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Advances in Cu₂O-based Photocathodes for Photoelectrochemical Water Splitting