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Bifunctional Electrocatalysts for Overall Water Splitting from an Iron/Nickel‐Based Bimetallic Metal–Organic Framework/Dicyandiamide Composite
Author(s) -
Zhao Xiaojia,
Pachfule Pradip,
Li Shuang,
Simke Jan Ron Justin,
Schmidt Johannes,
Thomas Arne
Publication year - 2018
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.201803136
Subject(s) - bifunctional , overpotential , bimetallic strip , electrocatalyst , water splitting , catalysis , materials science , oxygen evolution , oxide , inorganic chemistry , nickel , metal organic framework , chemical engineering , hydrogen production , metal , electrochemistry , chemistry , electrode , metallurgy , organic chemistry , photocatalysis , adsorption , engineering
Pyrolysis of a bimetallic metal–organic framework (MIL‐88‐Fe/Ni)‐dicyandiamide composite yield a Fe and Ni containing carbonaceous material, which is an efficient bifunctional electrocatalyst for overall water splitting. FeNi 3 and NiFe 2 O 4 are found as metallic and metal oxide compounds closely embedded in an N‐doped carbon–carbon nanotube matrix. This hybrid catalyst (Fe‐Ni@NC‐CNTs) significantly promotes the charge transfer efficiency and restrains the corrosion of the metallic catalysts, which is shown in a high OER and HER activity with an overpotential of 274 and 202 mV, respectively at 10 mA cm −2 in alkaline solution. When this bifunctional catalyst was further used for H 2 and O 2 production in an electrochemical water‐splitting unit, it can operate in ambient conditions with a competitive gas production rate of 1.15 and 0.57 μL s −1 for hydrogen and oxygen, respectively, showing its potential for practical applications.