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Iron-Based Metal–Organic Framework System as an Efficient Bifunctional Electrocatalyst for Oxygen Evolution and Hydrogen Evolution Reactions by Minli Gu; Shi-Cheng Wang; Chen Chen; Dengke Xiong; Fei-Yan Yi is a Chemistry article available to read on EtoBox.

What is Iron-Based Metal–Organic Framework System as an Efficient Bifunctional Electrocatalyst for Oxygen Evolution and Hydrogen Evolution Reactions about?

The fabrication of highly efficient and sustainable electrocatalysts used for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) is exceedingly challenging and warranted for overall water splitting. In this work, we successfully synthesized a series of metal-organic frameworks (MOFs), namely, as Fe 2 M-MOF (M = Fe, Co, Ni, Zn, Mn; H 4 L = 3,3,5,5′-azoxybenzenetetracarboxylic acid) under a simple and mild condition, in which the Fe 3 cluster as a basic building unit was replaced by the second kind of metal center; at the same time, a redox-active organic linker was adopted. The Fe 2 M-MOF system as a multifunctional catalyst realizes great improvement of the OER and HER performances. Among of them, the Fe 2 Co-MOF catalyst exhibits an extremely low overpotential of 339 mV at a current density of 10 mA cm -2 and a very small Tafel slope of 36.2 mV dec -1 in an alkaline electrolyte for OER. This result has far exceeded the commercial catalyst IrO 2 . Meanwhile, Fe 2 Zn-MOF manifests excellent HER activity with a small overpotential of 221 mV at 10 mA cm -2 and a low Tafel slope of 174 mV dec -1 . In addition, the good long-term stability for these catalysts can be e

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Author

Minli Gu; Shi-Cheng Wang; Chen Chen; Dengke Xiong; Fei-Yan Yi

Publisher

American Chemical Society (ACS)

Published

2020

Language

EN

Field

Chemistry (Physical Sciences)