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Stable Hierarchical Bimetal–Organic Nanostructures as HighPerformance Electrocatalysts for the Oxygen Evolution Reaction
Author(s) -
Zhou Wei,
Huang DanDan,
Wu YaPan,
Zhao Jun,
Wu Tao,
Zhang Jian,
Li DongSheng,
Sun Chenghua,
Feng Pingyun,
Bu Xianhui
Publication year - 2019
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201813634
Subject(s) - bimetallic strip , oxygen evolution , overpotential , bimetal , tafel equation , metal organic framework , chemistry , metal , nanostructure , catalysis , electrocatalyst , materials science , chemical engineering , nanotechnology , electrochemistry , electrode , organic chemistry , adsorption , engineering
The integration of heterometallic units and nanostructures into metal–organic frameworks (MOFs) used for the oxygen evolution reaction (OER) can enhance the electrocatalytic performance and help elucidate underlying mechanisms. We have synthesized a series of stable MOFs (CTGU‐10a1–d1) based on trinuclear metal carboxylate clusters and a hexadentate carboxylate ligand with a (6,6)‐connected nia net. We also present a strategy to synthesize hierarchical bimetallic MOF nanostructures (CTGU‐10a2–d2). Among these, CTGU‐10c2 is the best material for the OER, with an overpotential of 240 mV at a current density of 10 mA cm −2 and a Tafel slope of 58 mV dec −1 . This is superior to RuO 2 and confirms CTGU‐10c2 as one of the few known high‐performing pure‐phase MOF‐OER electrocatalysts. Notably, bimetallic CTGU‐10b2 and c2 show an improved OER activity over monometallic CTGU‐10a2 and d2. Both DFT and experiments show that the remarkable OER performance of CTGU‐10c2 is due to the presence of unsaturated metal sites, a hierarchical nanobelt architecture, and the Ni–Co coupling effect.