Narrow-Bandgap Halide Perovskite Cs 4 CuSb 2 Cl 12 with Full-Spectrum Photothermal Conversion

作者：Yutian Wang, Yuanxin Ji, Yalin Yang, Zheyan Chen, Hao Sun, Xuejiao Wang, Zhigang Zou, Hanlin Huang · 发表于：ACS Energy Letters · 年份：2024 · DOI：10.1021/acsenergylett.3c02218 · 被引用次数：58 · 研究领域：Perovskite Materials and Applications、Advanced Photocatalysis Techniques、Solar-Powered Water Purification Methods

Light-to-heat conversion represents one of the most promising pathways to utilize full-spectrum solar energy. The key for boosting the photothermal conversion in semiconductor-based light absorbers relies on narrowing the bandgap for harvesting wide-range sunlight and localizing thermal energy via decreasing heat loss. Here, we demonstrate the first example of using a halide perovskite, Cs 4 CuSb 2 Cl 12, as the photothermal material for efficient solar-to-heat conversion, with an intrinsic narrow bandgap and ultralow thermal conductivity. Full-spectrum (200–2500 nm) absorption and solar-thermal conversion efficiency up to 93.4% are achieved. The photothermal property enables a low-temperature and rapid hydrogen production from ammonia borane, with 2.0 equiv of hydrogen released, and a photothermal activation efficiency of 12.2% is realized, without any extra energy input. This high photothermal performance not only provides a potential for an energy-efficient on-board hydrogen supply for fuel cells but also opens up a new field for halide perovskites utilized as photothermal convertors.