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Metal–Organic Framework‐Derived Fe/Co‐based Bifunctional Electrode for H 2 Production through Water and Urea Electrolysis
Author(s) -
Singh Thangjam Ibomcha,
Rajeshkhanna Gaddam,
Singh Soram Bobby,
Kshetri Tolendra,
Kim Nam Hoon,
Lee Joong Hee
Publication year - 2019
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.201902232
Subject(s) - overpotential , oxygen evolution , electrolysis , bifunctional , water splitting , urea , anode , inorganic chemistry , prussian blue , hydrogen production , electrolysis of water , chemistry , catalysis , electrocatalyst , alkaline water electrolysis , electrode , materials science , chemical engineering , electrochemistry , organic chemistry , photocatalysis , electrolyte , engineering
Hollow‐structured Fe x Co 2− x P, Fe x Co 3− x O 4 , and Prussian blue analogue (FeCo‐PBA) microbuilding arrays on Ni foam (NF) are derived from Co‐based metal–organic frameworks (Co‐MOF) using a simple room temperature and post‐heat‐treatment route. Among them, Fe x Co 2− x P/NF shows excellent bifunctional catalytic activities by demonstrating very low oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) overpotentials of 255/114 mV at a current density of 20/10 mA cm −2 respectively, whereas Fe x Co 3− x O 4 /NF and FeCo‐PBA/NF demand higher overpotentials. Remarkably, for water electrolysis, Fe x Co 2− x P/NF requires only 1.61 V to obtain 10 mA cm −2 . In contrast to water electrolysis, urea electrolysis reduces overpotential and simultaneously purifies the urea‐rich wastewater. The urea oxidation reaction at the Fe x Co 2− x P/NF anode needs just 1.345 V to achieve 20 mA cm −2 , which is 140 mV less than the 1.48 V potential required for OER. Moreover, the generation of H 2 through urea electrolysis needs only 1.42 V to drive 10 mA cm −2 .