Metal-oxo Cluster Mediated Atomic Rh with High Accessibility for Efficient Hydrogen Evolution,Small

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Metal-oxo Cluster Mediated Atomic Rh with High Accessibility for Efficient Hydrogen Evolution
Small ( IF 13.0 ) Pub Date : 2023-01-17 , DOI: 10.1002/smll.202207527
Hai Dong ₁ , Zhenyang Zhao ₁ , Zihe Wu ₁ , Chong Cheng ₁ , Xianglin Luo ₁ , Shuang Li ₁ , Tian Ma _{1,

2}

Affiliation

Achieving single-atom catalysts (SACs) with high metal content and outstanding performance as well as robust stability is critically needed for clean and sustainable energy. However, most of the synthesized SACs are undesired on the loading content of the metal due to the anchored metals and the supports as well as the synthesizing methods. Herein, a Rh-SAC with high accessibility by loading it on the metal nodes of metal-porphyrin-based PCN MOFs (PCN-224) as supporting material is reported. Significantly, the PCN-Rh_15.9/KB catalyst with a high Rh content of 15.9 wt% exhibits excellent hydrogen evolution activity with a low overpotential of 25 mV at a current density of 10 mA cm⁻² and a mass activity of 7.7 A mg⁻¹_Rh at overpotential of 150 mV, which is much better than that of the commercial Rh/C. Various characterizations reveal the Rh species is stabilized by the metal nodes bearing −O/OH_x in MOFs, which is of importance for the high loading amount and the good activity. This work establishes an efficient approach to synthesize high content SACs on the nodes of MOFs for wide catalyst design.

中文翻译：

金属-氧簇介导的原子 Rh 具有高效析氢的高可及性

清洁和可持续能源迫切需要实现具有高金属含量和出色性能以及稳健稳定性的单原子催化剂 (SAC)。然而，由于锚定金属和载体以及合成方法的原因，大多数合成的 SAC 在金属负载量上是不理想的。在此，报道了一种具有高可及性的 Rh-SAC，将其加载到基于金属卟啉的 PCN MOFs (PCN-224) 的金属节点上作为支撑材料。值得注意的是，具有 15.9 wt% 高 Rh 含量的 PCN-Rh _{15.9 /KB 催化剂表现出优异的析氢活性，在 10 mA cm}^-2的电流密度下具有 25 mV 的低过电位和 7.7 A mg - 的质量活性^{。 1}_铑在 150 mV 的过电位下，这比商业 Rh/C 好得多。各种表征表明 Rh 物种被 MOF 中带有-O/OH _x的金属节点稳定，这对于高负载量和良好的活性具有重要意义。这项工作建立了一种在 MOF 节点上合成高含量 SAC 的有效方法，用于宽催化剂设计。

更新日期：2023-01-17

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