Accelerating structure reconstruction to form NiOOH in metal–organic frameworks (MOFs) for boosting the oxygen evolution reaction,Nanoscale

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Accelerating structure reconstruction to form NiOOH in metal–organic frameworks (MOFs) for boosting the oxygen evolution reaction
Nanoscale ( IF 5.8 ) Pub Date : 2023-11-03 , DOI: 10.1039/d3nr05051c
Ruiyao Hou ₁ , Xiaoxia Yang ₁ , Linghui Su ₂ , Wanglai Cen _{2,

3} , Lin Ye ₄ , Dengrong Sun _{3,

5}

Affiliation

Structural reconstruction of electrocatalysts to generate metal hydroxide/oxyhydroxide species is critical for an efficient oxygen evolution reaction (OER), but the controllable regulation of the reconstruction process still remains a challenge. Given the designable nature of metal–organic frameworks (MOFs), herein, we have reported a localized structure disordering strategy to accelerate the structural reconstruction of Ni-BDC to generate NiOOH for boosting the OER. The Ni-BDC nanosheets were modified by Fe³⁺ and urea to form cracks, which could promote the accessibility of the Ni sites by the electrolyte and thus promote the reconstruction to form NiOOH. In addition, the interaction between Ni²⁺ and Fe³⁺ allows the electron flow from Ni²⁺ to Fe³⁺, further enhancing the NiOOH generation. As a result, the optimized sample exhibits excellent OER activity with a small overpotential of 251 mV at 10 mA cm⁻², which is superior to most of the MOF-based OER catalysts reported previously. This work provides a controllable strategy to regulate the structural reconstruction for promoting the OER, which could provide important guidance for the development of more efficient OER electrocatalysts.

中文翻译：

加速结构重建，在金属有机框架 (MOF) 中形成 NiOOH，以促进析氧反应

电催化剂的结构重建以产生金属氢氧化物/羟基氧化物物质对于有效的析氧反应（OER）至关重要，但重建过程的可控调节仍然是一个挑战。鉴于金属有机框架（MOF）的可设计性质，本文报告了一种局部结构无序策略，以加速 Ni-BDC 的结构重建，生成 NiOOH 以提高 OER。Ni-BDC纳米片经Fe ³⁺和尿素修饰形成裂纹，可以促进电解质对Ni位点的可及性，从而促进重构形成NiOOH。此外，Ni ²⁺和Fe ³⁺之间的相互作用允许电子从Ni ²⁺流向Fe ³⁺，进一步增强NiOOH的生成。结果，优化后的样品表现出优异的OER活性，在10 mA cm ^-2下具有251 mV的小过电势，优于之前报道的大多数基于MOF的OER催化剂。这项工作提供了调控结构重构以促进OER的可控策略，可为开发更高效的OER电催化剂提供重要指导。

更新日期：2023-11-03

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