<br>在 FeNi LDH/FeII/III-MOF 异质核壳结构上掺杂 Ru，以实现高效析氧,Dalton Transactions

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在 FeNi LDH/FeII/III-MOF 异质核壳结构上掺杂 Ru，以实现高效析氧
Dalton Transactions ( IF 3.5 ) Pub Date : 2024-02-19 , DOI: 10.1039/d4dt00008k
Yijia Cao ₁ , Yusong Wen ₁ , Yanrong Li ₁ , Mengya Cao ₁ , Bao Li ₁ , Qing Shen ₁ , Wen Gu ₁

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RuO ₂和IrO ₂等贵金属基催化剂广泛用于OER的催化。然而，由于其价格高且稳定性差，迫切需要开发低贵金属掺杂的过渡金属基电催化剂作为替代品。在 3D 金属有机框架 (MOF) 上生长的层状双氢氧化物 (LDH) 由于异质界面上存在丰富的缺陷、大表面积和固有的析氧活性，因此非常适合掺杂贵金属。在本研究中，以Fe-soc-MOFs为基底，通过两步溶剂热法制备了一种新型的FeNi LDH/MOF异质结构。随后，通过水热工艺引入Ru。合成的Ru@FeNi LDH/MOF在10 mA cm ^-2电流密度下的过电位仅为242 mV，可连续电解48 h。其独特的纳米立方核壳结构和表面的花状LDHs提供了大量的活性位点，成为保证高活性和稳定性的关键。 Ru的掺杂调整了电子结构，加速了电子转移，进一步提高了电化学活性。该研究为开发低贵金属负载量的过渡金属基催化剂提供了新思路。

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Doping Ru on FeNi LDH/FeII/III–MOF heterogeneous core–shell structure for efficient oxygen evolution

Noble metal-based catalysts such as RuO₂ and IrO₂ are widely used in the catalysis of the OER. However, because of their high price and poor stability, it is urgent to develop transition metal-based electrocatalysts with low precious metal doping as an alternative. Layered double hydroxides (LDHs) grown on 3D metal–organic frameworks (MOFs) are ideal for doping precious metals owing to abundant defects at the heterointerface, large surface area, and intrinsic oxygen evolution activity. In this study, a novel FeNi LDH/MOF heterostructure was prepared via a two-step solvothermal method using Fe-soc-MOFs as the substrate. Subsequently, Ru was introduced through a hydrothermal process. The as-synthesized Ru@FeNi LDH/MOF has an overpotential of only 242 mV at a current density of 10 mA cm⁻² and can be used in continuous electrolysis for 48 h. Its unique nanocubic core–shell structure and flower-like LDHs on its surface provide a large number of active sites, which become the key to ensuring high activity and stability. With the doping of Ru, the electronic structure was adjusted and electron transfer was accelerated, further improving electrochemical activity. This study provides a new idea for developing transition metal-based catalysts with low noble metal loading.

更新日期：2024-02-19

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