TY - JOUR
T1 - Spinel Cobalt Titanium Binary Oxide as an All-Non-Precious Water Oxidation Electrocatalyst in Acid
AU - Anantharaj, Sengeni
AU - Karthick, Kannimuthu
AU - Kundu, Subrata
N1 - Funding Information:
S.A. and K.K. acknowledge the financial support from CSIR and UGC, New Delhi, respectively, through Senior Research Fellowship (SRF) program. S.K. wishes to acknowledge department of Science and Technology (DST) for EMR research funding of No. EMR/2017/000860 dated May 11, 2018 with institute OM No. 18-29-03/(27/2018)−TTBD-CSIR-CECRI on Oct 29, 2018.
Publisher Copyright:
© 2019 American Chemical Society.
PY - 2019/7/1
Y1 - 2019/7/1
N2 - Replacing precious water oxidation electrocatalysts used in proton exchange membrane (PEM) water electrolyzers with the nonprecious and abundant electrocatalysts is still a poorly addressed issue in the field of hydrogen generation in acidic medium through water electrolysis. Herein we report such an all-nonprecious binary spinel metal oxide the "cobalt titanate" (Co2TiO4) as an efficient alternate to expensive IrO2 and RuO2 for PEM water electrolyzer. The synthesized Co2TiO4 octahedral nanocrystals of size 50 to 210 nm showed excellent oxygen evolution reaction (OER) activity in 0.5 M H2SO4, which was comparable to IrO2 and better than spinel Co3O4 when examined under identical experimental conditions. Overpotential of just 513 mV was sufficient enough to drive a kinetic current density of 10 mA cm-2, which is a significant figure of merit as far as acidic water oxidation electrocatalysis is concerned.
AB - Replacing precious water oxidation electrocatalysts used in proton exchange membrane (PEM) water electrolyzers with the nonprecious and abundant electrocatalysts is still a poorly addressed issue in the field of hydrogen generation in acidic medium through water electrolysis. Herein we report such an all-nonprecious binary spinel metal oxide the "cobalt titanate" (Co2TiO4) as an efficient alternate to expensive IrO2 and RuO2 for PEM water electrolyzer. The synthesized Co2TiO4 octahedral nanocrystals of size 50 to 210 nm showed excellent oxygen evolution reaction (OER) activity in 0.5 M H2SO4, which was comparable to IrO2 and better than spinel Co3O4 when examined under identical experimental conditions. Overpotential of just 513 mV was sufficient enough to drive a kinetic current density of 10 mA cm-2, which is a significant figure of merit as far as acidic water oxidation electrocatalysis is concerned.
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U2 - 10.1021/acs.inorgchem.9b00868
DO - 10.1021/acs.inorgchem.9b00868
M3 - Article
C2 - 31185540
AN - SCOPUS:85067368276
SN - 0020-1669
VL - 58
SP - 8570
EP - 8576
JO - Inorganic Chemistry
JF - Inorganic Chemistry
IS - 13
ER -