Hydrogen boride (HB) nanosheets are expected to be safe and lightweight hydrogen carriers because of their high gravimetric hydrogen density (8.5 wt %) and photon-driven hydrogen release under mild conditions. However, previously reported HB nanosheets respond only to ultraviolet (UV) light to release hydrogen. In this study, we develop dye-modified HB nanosheets that can release hydrogen under visible light irradiation (>470 nm) without heat input. Hydrogen generation is initiated by electron injection from excited dye molecules into the conduction band of the HB nanosheets. The conduction band of the HB nanosheets is formed by the antibonding states of the B 2p_y and H 1s atomic orbitals, and the electrons injected from the dye molecules react with the protons of the HB nanosheets to release gaseous hydrogen molecules. Although the hydrogen production is terminated after long-term light irradiation owing to dye oxidation and/or loss of protons in HB nanosheets, the total amount of the released hydrogen molecules corresponds to approximately 25% of the protons in HB nanosheets even under the extra mild conditions. The addition of a sacrificial agent like iodine ions and a proton source like formic acid sustained the H₂ generation from the dye-modified HB nanosheets under visible light irradiation for long term.

中文翻译：

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染料敏化硼化氢纳米片的可见光驱动氢释放


硼化氢（HB）纳米片由于其高重量氢密度（8.5 wt％）和在温和条件下光子驱动的氢释放而有望成为安全且轻质的氢载体。然而，之前报道的 HB 纳米片仅响应紫外线 (UV) 来释放氢气。在这项研究中，我们开发了染料修饰的 HB 纳米片，它可以在可见光照射（> 470 nm）下释放氢气，而无需输入热量。氢气的产生是通过将电子从激发的染料分子注入到 HB 纳米片的导带中来引发的。 HB纳米片的导带由B 2p _y 和H 1s原子轨道的反键态形成，从染料分子注入的电子与HB纳米片的质子反应释放出气态氢分子。尽管由于染料氧化和/或HB纳米片中质子的损失，长期光照射后氢气产生终止，但即使在超温和的光照下，释放的氢分子总量也相当于HB纳米片中质子的约25％。状况。添加碘离子等牺牲剂和甲酸等质子源可以在可见光照射下长期维持染料修饰的HB纳米片产生H ₂ 。