Ambient Fast Synthesis and Active Sites Deciphering of Hierarchical Foam-Like Trimetal-Organic Framework Nanostructures as a Platform for Highly Efficient Oxygen Evolution Electrocatalysis
Ambient Fast Synthesis and Active Sites Deciphering of Hierarchical Foam-Like Trimetal-Organic Framework Nanostructures as a Platform for Highly Efficient Oxygen Evolution Electrocatalysis
复制标题
多级泡沫（如三金属）的环境快速合成和活性位点破译——有机框架纳米结构作为高效析氧电催化的平台
DOI：
10.1002/adma.201901139
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发表时间：
2019-06-01
影响因子：
29.4
通讯作者：
Zhang, Genqiang
中科院分区：
文献类型：
--
作者：
Qian, Qizhu;Li, Yapeng;Zhang, Genqiang
金属有机骨架材料由于其独特的结构特征，在电催化等方面有着广阔的应用前景，引起了人们极大的兴趣。然而，它仍然是一个挑战，直接使用的MOFs的氧电催化，因为它是相当困难的操纵它们的尺寸，组成和形态的MOFs丰富的活性位点。在这里，一个简单的环境温度合成的独特的NiCoFe基三金属MOF纳米结构的泡沫状结构的报告，表现出非凡的析氧反应（OER）活性作为直接使用的催化剂在碱性条件下。具体而言，（Ni 2Co 1）（0.925）Fe-0.075-MOF-NF提供257 mV的最小过电位，以达到10 mA cm（-2）的电流密度，具有41.3 mV dec（-1）的小塔菲尔斜率，并且在长期测试后表现出高耐久性。更重要的是，通过表征OER过程中的中间体来解释高活性的可能来源，其中电化学转化的金属氢氧化物和羟基氧化物被确认为活性物质。
Metal-organic frameworks (MOFs) have attracted tremendous interest due to their promising applications including electrocatalysis originating from their unique structural features. However, it remains a challenge to directly use MOFs for oxygen electrocatalysis because it is quite difficult to manipulate their dimension, composition, and morphology of the MOFs with abundant active sites. Here, a facile ambient temperature synthesis of unique NiCoFe-based trimetallic MOF nanostructures with foam-like architecture is reported, which exhibit extraordinary oxygen evolution reaction (OER) activity as directly used catalyst in alkaline condition. Specifically, the (Ni2Co1)(0.925)Fe-0.075-MOF-NF delivers a minimum overpotential of 257 mV to reach the current density of 10 mA cm(-2) with a small Tafel slope of 41.3 mV dec(-1) and exhibits high durability after long-term testing. More importantly, the deciphering of the possible origination of the high activity is performed through the characterization of the intermediates during the OER process, where the electrochemically transformed metal hydroxides and oxyhydroxides are confirmed as the active species.