posted on 2024-01-04, 13:34authored byYutian Wang, Yuanxin Ji, Yalin Yang, Zheyan Chen, Hao Sun, Xuejiao Wang, Zhigang Zou, Hanlin Huang
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, Cs4CuSb2Cl12, 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.