Unveiling Chemically Robust Bimetallic Squarate-Based Metal–Organic Frameworks for Electrocatalytic Oxygen Evolution Reaction,Advanced Energy Materials

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Unveiling Chemically Robust Bimetallic Squarate-Based Metal–Organic Frameworks for Electrocatalytic Oxygen Evolution Reaction
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2022-11-18 , DOI: 10.1002/aenm.202202964
Sharath Kandambeth ₁ , Vinayak. S. Kale ₁ , Dong Fan ₂ , Jeremy A. Bau ₃ , Prashant M. Bhatt ₁ , Sheng Zhou ₁ , Aleksander Shkurenko ₁ , Magnus Rueping ₃ , Guillaume Maurin ₂ , Osama Shekhah ₁ , Mohamed Eddaoudi ₁

Affiliation

Here, this work reports an innovative strategy for the synthesis of chemically robust metal–organic frameworks (MOFs), and applies them as catalysts for the electrocatalytic oxygen evolution reaction (OER). A bimetallic squarate-based MOF (Sq-MOF) with a zbr topology serves as an excellent platform for electrocatalytic OER owing to its open porous structure, high affinity toward water, and presence of catalytically active 1D metal hydroxide strips. By regulating the Ni²⁺ content in a bimetallic squarate MOF system, the electrochemical structural stability toward OER can be improved. The screening of various metal ratios demonstrates that Ni₃Fe₁ and Ni₂Fe₁ Sq-zbr-MOFs show the best performance for electrocatalytic OER in terms of catalytic activity and structural stability. Ni₂Fe₁ Sq-zbr-MOF shows a low overpotential of 230 mV (at 10 mA cm⁻²) and a small Tafel slope of 37.7 mV dec⁻¹, with an excellent long-term electrochemical stability for the OER. Remarkably, these overpotential values of Ni₂Fe₁ Sq-zbr-MOF are comparable with those of the best-performing layered double hydroxide (LDH) systems and outperforms the commercially available noble-metal-based RuO₂ catalyst for OER under identical operational conditions.

中文翻译：

揭示用于电催化析氧反应的化学稳健的双金属方酸盐基金属-有机框架

在这里，这项工作报告了一种合成化学坚固的金属有机骨架 (MOF) 的创新策略，并将其用作电催化析氧反应 (OER) 的催化剂。具有 zbr 拓扑结构的双金属方酸基 MOF (Sq-MOF)由于其开放的多孔结构、对水的高亲和力以及催化活性的一维金属氢氧化物条带的存在，可作为电催化 OER 的绝佳平台。通过调节双金属方形 MOF 体系中的 Ni ²⁺含量，可以提高 OER 的电化学结构稳定性。各种金属配比的筛选表明Ni ₃ Fe ₁和Ni ₂ Fe ₁ Sq- zbr-MOFs 在催化活性和结构稳定性方面表现出最佳的电催化 OER 性能。Ni ₂ Fe ₁ Sq-zbr-MOF显示出 230 mV（在 10 mA cm ^{-2下）的低过电势和 37.7 mV dec}^-1的小 Tafel 斜率，具有出色的 OER 长期电化学稳定性。值得注意的是，Ni ₂ Fe ₁ Sq- zbr -MOF的这些过电势值与性能最佳的层状双氢氧化物 (LDH) 系统相当，并且在相同操作条件下优于市售的贵金属基 RuO ₂ OER 催化剂.

更新日期：2022-11-18

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