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Trimetallic conductive metal–organic frameworks as precatalysts for the oxygen evolution reaction with enhanced activity

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Abstract

Developing new precious-metal-free catalysts for the electrochemical oxygen evolution reaction (OER) is important for energy conversion and storage applications. Here, we report the preparation of a series of conductive M-CAT metal–organic frameworks (MOFs) (M3(HHTP)2, HHTP = 2,3,6,7,10,11-hexahydroxytriphenylene) and their utilization as a “precatalyst” for the OER in an alkaline electrolyte. The mono- and bimetallic CoxNi1−x-CATs were synthesized by a solvothermal reaction and further converted to the corresponding bi- and trimetallic FeCoxNi1−x-CATs via cation-exchange. Compared to its mono- and bimetallic counterparts, trimetallic FeCo0.6Ni0.4-CAT displays superior OER electrocatalytic performance with a low overpotential of 277 mV (to reach a current density of 10 mA cm−2), a small Tafel slope of 44.7 mV dec−1, a high TOF value of 0.2278 s−1, and excellent electrochemical durability. Our study indicates that metal oxyhydroxides were electrochemically formed under the alkaline aqueous OER conditions, which, instead of the pristine M-CATs, should contribute mainly to the enhanced OER activity.

Graphical abstract: Trimetallic conductive metal–organic frameworks as precatalysts for the oxygen evolution reaction with enhanced activity

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Article information


Submitted
30 Mar 2020
Accepted
20 Jun 2020
First published
22 Jun 2020

Sustainable Energy Fuels, 2020, Advance Article
Article type
Paper

Trimetallic conductive metal–organic frameworks as precatalysts for the oxygen evolution reaction with enhanced activity

X. Shi, R. Hua, Y. Xu, T. Liu and G. Lu, Sustainable Energy Fuels, 2020, Advance Article , DOI: 10.1039/D0SE00515K

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