Work

Unassisted CsPbBr3‐Cu2O Tandem Devices for Solar‐Driven Overall Water Splitting

Year: 2025

Type: article

Abstract: Generating sufficient photovoltage for solar‐driven overall water splitting is challenging for a single photoelectrode. Herein, a face‐to‐face type unbiased tandem solar overall water splitting device based on CsPbBr3‐Cu2O dual‐photoelectrodes is reported. To realize the face‐to‐face configuration, the semitransparent CsPbBr3 photoanode has been firstly prepared by integrating a transparent Ni‐based multifunctional layer on a perovskite light‐absorbing device, which achieves a low oxygen evolution reaction onset potential (Eon) of 0.14 V versus RHE. Subsequently, the hydrogen evolution reaction (HER) Eon and fill factor of the Cu2O photocathode have been improved by constructing buried heterojunctions, which positively shifts it's HER Eon to 0.91 V versus RHE. The tandem device achieves a solar‐to‐hydrogen efficiency of 5.42%, a result of the matched Eon between the semitransparent CsPbBr3 photoanode and the Cu2O photocathode. This face‐to‐face tandem structure maximizes the utilization of solar energy and provides a viable strategy for the future development of solar water splitting systems based on perovskite‐based photoelectrodes.

Source: ChemCatChem

DOI: 10.1002/cctc.202500388

Authors: Chunyang Zheng, Jize Wang, Huiren Zheng, Shaowen Cao, Yong Peng

Institutions: Wuhan University of Technology, State Key Laboratory of Advanced Technology For Materials Synthesis and Processing

Language: English

Topic: Advanced Photocatalysis Techniques

Subfield: Renewable Energy, Sustainability and the Environment

Field: Energy

Domain: Physical Sciences

SDG: Affordable and clean energy

Open Access status: bronze

Funder: National Natural Science Foundation of China