Bimetallic Cage-Based Metal-Organic Frameworks for Electrochemical Hydrogen Evolution Reaction with Enhanced Activity

Rui-Zhe Zhang; Le-Le Lu; Zhong-Hang Chen; Xiaoping Zhang; Bo-Yuan Wu; Wei Shi; Peng Cheng

doi:10.1002/chem.202200401

Bimetallic Cage-Based Metal-Organic Frameworks for Electrochemical Hydrogen Evolution Reaction with Enhanced Activity

Chemistry. 2022 May 16;28(28):e202200401. doi: 10.1002/chem.202200401. Epub 2022 Apr 5.

Authors

Rui-Zhe Zhang¹, Le-Le Lu¹, Zhong-Hang Chen¹, Xiaoping Zhang¹, Bo-Yuan Wu¹, Wei Shi^{1

2}, Peng Cheng^{1

2}

Affiliations

¹ Department of Chemistry, Key Laboratory of Advanced Energy Materials Chemistry (MOE), College of Chemistry, Nankai University, Tianjin, 300071, P. R. China.
² Department of Chemistry, Renewable Energy Conversion and Storage Center (RECAST), College of Chemistry, Nankai University, Tianjin, 300071, P. R. China.

PMID: 35289449
DOI: 10.1002/chem.202200401

Abstract

A cage-based metal-organic framework (Ni-NKU-101) with biphenyl-3,3',5,5'-tetracarboxylic acid was synthesized via solvothermal method. Ni-NKU-101 contains two types of cages based on trinuclear and octa-nuclear nickel-clusters that are connected with each other by the 4-connected ligands, to form a 3D framework with a new topology. A mixed-metal strategy was used to synthesize isostructural bimetallic MOFs of M_x Ni_1-x -NKU-101 (M=Mn, Co, Cu, Zn). The electrocatalytic studies showed that the hydrogen evolution reaction (HER) activity of Cu_x Ni_1-x -NKU-101 is much higher than that of other M_x Ni_1-x -NKU-101 catalysts in acidic aqueous solution, owing to the synergistic effect of the bimetallic centers. The optimized Cu_0.19 Ni_0.81 -NKU-101 has an overpotential of 324 mV at 10 mA cm^-2 and a Tafel slope of 131 mV dec^-1 . The mechanism of HER activity over these bimetallic MOF-based electrocatalysts are discussed in detail.

Keywords: electrocatalysts; hydrogen evolution reaction; metal-organic frameworks; mixed-metal strategy; synergistic effect.

Abstract

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