On-board hydrogen release from liquid organic carriers is a process that can make feasible the use of H₂ as a transportation fuel. Formic acid is considered as one of the most convenient liquid hydrogen organic carriers, and since it can be easily obtained from CO₂, it is water soluble which makes it unnecessary to recover the H₂-depleted byproducts. Compared to the more conventional thermal catalytic decomposition of formic acid, the use of light in combination with a photocatalyst has been much less explored. Herein, we report a new paradigm in MOF photocatalysis with the use of a microporous titanium oxocluster based metal–organic framework (Ti-MOF) endowed with formate-imprinted active sites, namely MIP-177-LT (MIP stands for Materials from Institute of Porous Materials of Paris, LT for Low Temperature), as a highly efficient photocatalyst for H₂ release from formic acid without the need to neutralize acidity or use sacrificial agents or noble metals. Noteworthily, a quantum efficiency of 22% has been determined for the photocatalytic H₂ release that is highly remarkable for a non-toxic noble metal-free photocatalyst.

中文翻译：

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Ti oxocluster 金属-有机骨架上的活性位点印迹用于甲酸光催化放氢

从液态有机载体中释放氢气是一种可以使使用 H ₂作为运输燃料变得可行的过程。甲酸被认为是最方便的液态氢有机载体之一，由于它可以很容易地从CO ₂中获得，它是水溶性的，因此无需回收H ₂-耗尽的副产品。与更传统的甲酸热催化分解相比，光与光催化剂结合使用的探索要少得多。在此，我们报告了一种新的 MOF 光催化范例，使用具有甲酸盐印迹活性位点的微孔钛氧簇基金属有机框架 (Ti-MOF)，即 MIP-177-LT（MIP 代表来自 Institute of Institute 的材料） Porous Materials of Paris, LT for Low Temperature)，作为甲酸释放 H ₂的高效光催化剂，无需中和酸度或使用牺牲剂或贵金属。值得注意的是，已确定光催化 H _{2的量子效率为 22%}对于无毒的无贵金属光催化剂来说，这是非常显着的释放。