In situ etch engineering of Ru doped NiFe(OH)x/NiFe-MOF nanocomposites for boosting the oxygen evolution reaction,Journal of Materials Chemistry A

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In situ etch engineering of Ru doped NiFe(OH)x/NiFe-MOF nanocomposites for boosting the oxygen evolution reaction
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2021-10-15 , DOI: 10.1039/d1ta06438j
Dongmei Liu ₁ , Hui Xu ₂ , Cheng Wang ₁ , Changqing Ye ₃ , Rui Yu ₁ , Yukou Du ₁

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Metal–organic frameworks (MOFs) have been deemed as promising electrocatalysts for electrochemical water oxidation; however, the poor electronic conductivity and stability are still intractable issues hindering their practical applications. Herein, an efficient in situ etching strategy is employed to transform part of the pristine NiFe-MOF into active NiFe(OH)_x and simultaneously induce the exposure of abundant defective areas, which not only facilitates the electron transfer efficiency for the oxygen evolution reaction (OER), but also enables the accessibility to further anchor Ru. Benefiting from the synergistic contributions of Ru, NiFe(OH)_x and NiFe-MOF, the as-fabricated Ru/NiFe(OH)_x/NiFe-MOF nanocomposite exhibits an enhanced OER activity with a low overpotential of 242 mV at a current density of 10 mA cm⁻², and a two-electrode Ru/NiFe(OH)_x/NiFe-MOF‖Pt/C electrolyzer also requires a considerably low voltage of 1.54 V at 10 mA cm⁻² for overall water splitting. Moreover, taking both experimental and mechanistic results into account, the introduction of a small amount of Ru is able to induce a stronger adsorption between electrochemically active sites and oxygen-related intermediates, thus facilitating the OER activity.

中文翻译：

Ru掺杂的NiFe(OH)x/NiFe-MOF纳米复合材料的原位蚀刻工程促进析氧反应

金属有机框架（MOFs）被认为是电化学水氧化的有前途的电催化剂。然而，较差的电子导电性和稳定性仍然是阻碍其实际应用的棘手问题。在此，采用有效的原位蚀刻策略将部分原始 NiFe-MOF 转化为活性 NiFe(OH) _x并同时诱导大量缺陷区域的暴露，这不仅有利于氧析出反应的电子转移效率（ OER)，但也使可访问性进一步锚定 Ru。受益于 Ru、NiFe(OH) _x和 NiFe-MOF的协同作用，制备的 Ru/NiFe(OH) _x/NiFe-MOF 纳米复合材料表现出增强的 OER 活性，在 10 mA cm ^-2的电流密度下具有 242 mV 的低过电位，以及双电极 Ru/NiFe(OH) _x /NiFe-MOF‖Pt/C 电解槽在 10 mA cm ^{-2 下}需要相当低的 1.54 V 电压来进行整体水分解。此外，考虑到实验和机械结果，少量 Ru 的引入能够在电化学活性位点和氧相关中间体之间引起更强的吸附，从而促进 OER 活性。

更新日期：2021-10-26

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