V3+ Incorporated β-Co(OH)2: A Robust and Efficient Electrocatalyst for Water Oxidation

Sengeni Anantharaj; Kannimuthu Karthick; Palanichamy Murugan; Subrata Kundu

doi:10.1021/acs.inorgchem.9b02977

V³⁺ Incorporated β-Co(OH)₂: A Robust and Efficient Electrocatalyst for Water Oxidation

Sengeni Anantharaj, Kannimuthu Karthick, Palanichamy Murugan, Subrata Kundu^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

18 Citations (Scopus)

Abstract

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.

Original language	English
Pages (from-to)	730-740
Number of pages	11
Journal	Inorganic Chemistry
Volume	59
Issue number	1
DOIs	https://doi.org/10.1021/acs.inorgchem.9b02977
Publication status	Published - 2020 Jan 6
Externally published	Yes

ASJC Scopus subject areas

Physical and Theoretical Chemistry
Inorganic Chemistry

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This output contributes to the following UN Sustainable Development Goals (SDGs)

Access to Document

10.1021/acs.inorgchem.9b02977

Cite this

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title = "V3+ Incorporated β-Co(OH)2: A Robust and Efficient Electrocatalyst for Water Oxidation",

abstract = "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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T1 - V3+ Incorporated β-Co(OH)2

T2 - A Robust and Efficient Electrocatalyst for Water Oxidation

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AU - Karthick, Kannimuthu

AU - Murugan, Palanichamy

AU - Kundu, Subrata

PY - 2020/1/6

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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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