TY - JOUR
T1 - V3+ Incorporated β-Co(OH)2
T2 - A Robust and Efficient Electrocatalyst for Water Oxidation
AU - Anantharaj, Sengeni
AU - Karthick, Kannimuthu
AU - Murugan, Palanichamy
AU - Kundu, Subrata
N1 - Funding Information:
The authors wish to acknowledge Dr. N. Kalaiselvi, Director, CSIR-CECRI for her continuous support and encouragement. S. Anantharaj wishes to acknowledge CSIR, New Delhi for SRF award and JSPS, Japan for the award of standard postdoctoral fellowship (Fellowship ID: P18346). K. Karthick wishes to acknowledge UGC, New Delhi for SRF award. S. Kundu wishes to acknowledge the Department of Science and Technology (DST) for EMR research funding by # EMR/2017/000860 on May 11th, 2018.
Publisher Copyright:
© 2019 American Chemical Society.
PY - 2020/1/6
Y1 - 2020/1/6
N2 - Catalyzing oxygen evolution reaction (OER) with the lowest possible overpotential is a key to ensure energy efficiency in the production of hydrogen from water electrochemically. In this report, we show the results that astonished us. Co hydroxide containing trivalent V was prepared chemically and screened for electrochemical water oxidation in rigorously Fe free 1 M KOH (pH 13.8). Overpotential of 198 mV at 10 mA cm-2 was observed for the synthesized Co-V hydroxide with the optimal Tafel slope of 60 mV dec-1. This is the lowest overpotential at this current density ever reported for OER in alkaline conditions while utilizing Co based electrocatalysts. Density function theory (DFT) calculations showed that the third elementary step (oxyhydroxide formation and delivery of O2) was spontaneous on V site that is bridging two adjacent Co sites which was attributed to the observed enhancement.
AB - Catalyzing oxygen evolution reaction (OER) with the lowest possible overpotential is a key to ensure energy efficiency in the production of hydrogen from water electrochemically. In this report, we show the results that astonished us. Co hydroxide containing trivalent V was prepared chemically and screened for electrochemical water oxidation in rigorously Fe free 1 M KOH (pH 13.8). Overpotential of 198 mV at 10 mA cm-2 was observed for the synthesized Co-V hydroxide with the optimal Tafel slope of 60 mV dec-1. This is the lowest overpotential at this current density ever reported for OER in alkaline conditions while utilizing Co based electrocatalysts. Density function theory (DFT) calculations showed that the third elementary step (oxyhydroxide formation and delivery of O2) was spontaneous on V site that is bridging two adjacent Co sites which was attributed to the observed enhancement.
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U2 - 10.1021/acs.inorgchem.9b02977
DO - 10.1021/acs.inorgchem.9b02977
M3 - Article
C2 - 31815442
AN - SCOPUS:85076809285
SN - 0020-1669
VL - 59
SP - 730
EP - 740
JO - Inorganic Chemistry
JF - Inorganic Chemistry
IS - 1
ER -
