Efficient hydrogen release from ammonia borane (AB) with a striking hydrogen content (19.6 wt%) via thermolysis provides a promising pathway for on‐board applications utilizing hydrogen energy. However, the sluggish kinetics at low temperatures and high energy consumption of thermal dehydrogenation are major obstacles for hydrogen release from AB. Herein, a novel solar‐driven strategy for hydrogen production from AB at low temperature is proposed, in which Ti₂O₃ is utilized as a full‐spectrum light absorber for photothermal‐activating solid‐state AB reactants to produce hydrogen. Through a reduction transformation method, nanoscale Ti₂O₃ particles with high chemical stability and narrow band gap are prepared, realizing a rapid production of 2.0 equivalents of hydrogen from AB at ambient temperature, with an excellent recyclable and full‐spectrum‐responsive photothermal dehydrogenation. Importantly, a record high photothermal activation efficiency of 35% is achieved with nanoscale Ti₂O₃ particles due to an enhanced local photothermal effect contributed by improved light absorption and decreased thermal conduction. Moreover, assisted with CuCl₂ promoter, a release of 2.0 equivalents of hydrogen under 1.0 solar irradiation at 70 °C is successfully achieved, revealing its potential applications in practical vehicles based on proton exchange membrane fuel cells.

中文翻译：

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氨硼烷的高效全光谱光热脱氢以低温释放氢

氨硼烷（AB）通过热分解可有效释放氢气，氢含量达到惊人的（19.6 wt％），为利用氢能的车载应用提供了有希望的途径。然而，低温下的动力学缓慢和热脱氢的高能耗是从AB中释放氢的主要障碍。在此，提出了一种新型的太阳能驱动的AB低温制氢策略，其中将Ti ₂ O ₃用作全光谱光吸收剂，用于光热活化固态AB反应物以产生氢气。通过还原转化法，纳米级的Ti ₂ O ₃制备了具有高化学稳定性和窄带隙的颗粒，实现了在室温下由AB快速产生2.0当量的氢，并具有出色的可循环利用和全光谱响应的光热脱氢能力。重要的是，由于改善的光吸收和减少的热传导而增强了局部光热效应，因此用纳米级的Ti ₂ O ₃颗粒达到了创纪录的35％的高光热活化效率。此外，在CuCl ₂促进剂的辅助下，成功地实现了在70°C的1.0太阳辐射下释放2.0当量的氢，从而揭示了其在基于质子交换膜燃料电池的实际车辆中的潜在应用。