Single junction CsPbBr<sub>3</sub> solar cell coupled with electrolyzer for solar water splitting.
basic_science · Level V
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- Record sourced from PubMed, PMID 40738924.
- Also identified by DOI 10.1038/s41467-025-58980-3 and PMC identifier 12311130.
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Abstract
Artificial photosynthesis system to realize Solar overall water splitting has been regarded as sustainable and renewable solution for energy and environmental issues. While artificial photosynthesis system (efficiency of 12.4%) greatly exceeds efficiency of natural photosynthesis, yet such high efficiency needs multiple, 2 or more light absorbers to achieve, total photovoltage above 1440 mV. In this report, we demonstrate visible light active Single light absorber -2 photons to 1 hydrogen (S2) overall water splitting via photovoltaic-electrochemical system that can be achieved by single junction solar cell, composed with CsPbBr<sub>3</sub> (band gap of 2.3 eV) solar cell with open circuit voltage larger than 1600 mV can power up water electrolyzer cell and achieves Solar to hydrogen efficiency of 1.7% with confirmed H<sub>2</sub> gas generation. Operating point shows possible STH of 5.0%. This result demonstrates its prospective on efficiency increment (max 12%) and Technoeconomic analysis (modest cost of 5.5 $/kg of hydrogen) in near future, as benchmark for S2 PV-EC system.