Integration of Cobalt Metal–Organic Frameworks into an Interpenetrated Prussian Blue Analogue to Derive Dual Metal–Organic Framework-Assisted Cobalt Iron Derivatives for Enhancing Electrochemical Total Water Splitting,The Journal of Physical Chemistry C

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Integration of Cobalt Metal–Organic Frameworks into an Interpenetrated Prussian Blue Analogue to Derive Dual Metal–Organic Framework-Assisted Cobalt Iron Derivatives for Enhancing Electrochemical Total Water Splitting
The Journal of Physical Chemistry C ( IF 3.3 ) Pub Date : 2020-06-24 , DOI: 10.1021/acs.jpcc.0c03086
Alagan Muthurasu ₁ , Gunendra Prasad Ojha ₁ , Minju Lee ₁ , Hak Yong Kim _{1,

2}

Affiliation

It is important to design a highly efficient, cost-effective, and stable bifunctional electrocatalyst for the overall water splitting process to produce both oxygen and hydrogen, which is considered as one of the most promising methods for alternative renewable sources. In this study, a highly porous dual metal–organic framework (MOF) based bimetallic cobalt–iron phosphide and oxide nanoarrays were developed on nickel foam by a two-step liquid phase deposition process followed by calcination and phosphatization. As-synthesized MOF bimetallic derivatives act as effective bifunctional catalysts for the oxygen evolution reaction (OER) and hydrogen evolution reaction (HER). It is interesting to note that the optimized electrochemical efficiency for OER and HER was achieved by MOF CoFeP nanoarrays with an overpotential of 310 mV and 200 mV offering a current density of 50 mA·cm^–2. In addition, an integrated water electrolyzer is developed using MOF CoFeP as an anode and cathode, requiring a cell voltage of 1.78 V to achieve a current density of 50 mA·cm^–2 in an alkaline medium. Our findings suggest that the ligand exchange conversion of the interpenetrated MOF network into an abundant porous structure could have a powerful synergistic effect on the overall water splitting reaction in an alkaline medium.

中文翻译：

将钴金属-有机骨架整合到互穿的普鲁士蓝中，类似于衍生双金属-有机骨架辅助的钴铁衍生物，以增强电化学总水分解

对于整个水分解过程同时生产氧气和氢气，设计一种高效，经济高效且稳定的双功能电催化剂非常重要，这被认为是替代可再生资源的最有前途的方法之一。在这项研究中，通过两步液相沉积工艺，然后进行煅烧和磷酸化，在镍泡沫上开发了一种基于高度多孔双金属-有机骨架（MOF）的双金属钴-铁磷化物和氧化物纳米阵列。合成的MOF双金属衍生物可作为有效的双官能催化剂，用于氧释放反应（OER）和氢释放反应（HER）。^–2。此外，还开发了一种使用MOF CoFeP作为阳极和阴极的集成水电解槽，该电解槽需要1.78 V的电池电压才能在碱性介质中实现50 mA·cm ^–2的电流密度。我们的发现表明，互穿的MOF网络的配体交换转化为丰富的多孔结构可能对碱性介质中的总水分解反应具有强大的协同作用。

更新日期：2020-07-09

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