Yu Haoyang, Cheng Zibo, Wen Hong, Wang Han, Pei Qijun, Guan Yeqin, Cao Hujun, Chen Ping
Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, 116023, China.
Center of Materials and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing, 100049, China.
Adv Sci (Weinh). 2025 Aug;12(32):e01140. doi: 10.1002/advs.202501140. Epub 2025 Jun 4.
The absence of safe and efficient hydrogen storage technologies is the major bottleneck for widespread applications of hydrogen energy. Reactive hydride composites with high gravimetric and volumetric hydrogen densities are ideal hydrogen storage materials. However, their traditional dehydrogenation processes normally involving electric-thermal-chemical energy conversion require high operating temperatures and substantial energy inputs to heat the reactor and oven. In this study, using LiBH-2LiNH as a model system, that rapid dehydrogenation via a photo-thermal-chemical and/or photo-chemical energy conversion initiated by direct light irradiation is demonstrated and can be fulfilled in the presence of a catalyst and a photothermal agent. The experimental results revealed that the non-thermal effect of UV light plays a critical role in reducing the desorption temperature and enhancing the dehydrogenation kinetics. The collective photothermal and non-thermal effects drove over 8.0 wt.% hydrogen desorption from LiBH-2LiNH within 5 min, which is ≈60 times faster than the thermal dehydrogenation process at the same temperature.
缺乏安全高效的储氢技术是氢能广泛应用的主要瓶颈。具有高重量和体积氢密度的反应性氢化物复合材料是理想的储氢材料。然而，它们传统的脱氢过程通常涉及电热化学能转换，需要高操作温度和大量能量输入来加热反应器和烘箱。在本研究中，以LiBH-2LiNH为模型体系，证明了通过直接光照射引发的光热化学和/或光化学能转换实现快速脱氢，并且可以在催化剂和光热剂存在的情况下完成。实验结果表明，紫外光的非热效应在降低解吸温度和增强脱氢动力学方面起着关键作用。光热和非热效应共同作用，在5分钟内使LiBH-2LiNH的氢解吸量超过8.0 wt.%，这比相同温度下的热脱氢过程快约60倍。
