Magnetic CoPt nanoparticle-decorated ultrathin Co(OH)2 nanosheets: An efficient bi-functional water splitting catalyst

Bibhudatta Malik; S. Anantharaj; K. Karthick; Deepak K. Pattanayak; Subrata Kundu

doi:10.1039/c7cy00309a

Magnetic CoPt nanoparticle-decorated ultrathin Co(OH)₂ nanosheets: An efficient bi-functional water splitting catalyst

Bibhudatta Malik, S. Anantharaj, K. Karthick, Deepak K. Pattanayak, Subrata Kundu

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

65 Scopus citations

Abstract

Hydrogen generation via electrocatalytic water splitting is on the cutting edge of energy research. The kinetic burdens associated with the sluggish anodic oxygen evolution reaction (OER) and cathodic hydrogen evolution reaction (HER) cause a large amount of energy loss. Hence, these reactions must be catalyzed. Therefore, an array of magnetic CoPt nanoparticle (NP)-decorated ultrathin Co(OH)₂ nanosheets was synthesized and applied for electrocatalytic water splitting in 1 M KOH. CoPt@Co(OH)₂ required a minimum overpotential of 334 mV at 10 mA cm^-2 in the OER and 226 mV at 50 mA cm^-2 in the HER in addition to possessing exceptional stability upon cycling and chronoamperometry. The advantages of the magnetic property of CoPt@Co(OH)₂ have been utilized for the first time to improve its stability. The aging study carried out at the CoPt@Co(OH)₂-modified interface with and without magnetic support has shown that the magnetically co-stabilized interface was more stable even after 5 days of aging in 1 M KOH. This magnetism-assisted enhancement in the stability of a nanocatalyst-modified interface along with proper further developments will surely take the electrocatalysis of water splitting to a new level.

Original language	English
Pages (from-to)	2486-2497
Number of pages	12
Journal	Catalysis Science and Technology
Volume	7
Issue number	12
DOIs	https://doi.org/10.1039/c7cy00309a
State	Published - 2017
Externally published	Yes

Bibliographical note

Publisher Copyright:
© The Royal Society of Chemistry 2017.

Funding

The authors of this study acknowledge the kind support and encouragement extended by Dr. Vijayamohanan K. Pillai, Director, CSIR-CECRI. B. M. and D. K. P. would like to acknowledge the funding provided through MULTIFUN. S. A. and K. K. acknowledge the CSIR-New Delhi, and UGC-New Delhi for senior and junior research fellowship (SRF/JRF) awards, respectively. The authors also wish to acknowledge all the faculty of the central instrumentation facility (CIF), CSIR-CECRI, Karaikudi.

Funders	Funder number
Joseph Rowntree Foundation
Smoking Research Foundation
Central ElectroChemical Research Institute

UN SDGs

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

Access to Document

10.1039/c7cy00309a

Cite this

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abstract = "Hydrogen generation via electrocatalytic water splitting is on the cutting edge of energy research. The kinetic burdens associated with the sluggish anodic oxygen evolution reaction (OER) and cathodic hydrogen evolution reaction (HER) cause a large amount of energy loss. Hence, these reactions must be catalyzed. Therefore, an array of magnetic CoPt nanoparticle (NP)-decorated ultrathin Co(OH)2 nanosheets was synthesized and applied for electrocatalytic water splitting in 1 M KOH. CoPt@Co(OH)2 required a minimum overpotential of 334 mV at 10 mA cm-2 in the OER and 226 mV at 50 mA cm-2 in the HER in addition to possessing exceptional stability upon cycling and chronoamperometry. The advantages of the magnetic property of CoPt@Co(OH)2 have been utilized for the first time to improve its stability. The aging study carried out at the CoPt@Co(OH)2-modified interface with and without magnetic support has shown that the magnetically co-stabilized interface was more stable even after 5 days of aging in 1 M KOH. This magnetism-assisted enhancement in the stability of a nanocatalyst-modified interface along with proper further developments will surely take the electrocatalysis of water splitting to a new level.",

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AU - Pattanayak, Deepak K.

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N2 - Hydrogen generation via electrocatalytic water splitting is on the cutting edge of energy research. The kinetic burdens associated with the sluggish anodic oxygen evolution reaction (OER) and cathodic hydrogen evolution reaction (HER) cause a large amount of energy loss. Hence, these reactions must be catalyzed. Therefore, an array of magnetic CoPt nanoparticle (NP)-decorated ultrathin Co(OH)2 nanosheets was synthesized and applied for electrocatalytic water splitting in 1 M KOH. CoPt@Co(OH)2 required a minimum overpotential of 334 mV at 10 mA cm-2 in the OER and 226 mV at 50 mA cm-2 in the HER in addition to possessing exceptional stability upon cycling and chronoamperometry. The advantages of the magnetic property of CoPt@Co(OH)2 have been utilized for the first time to improve its stability. The aging study carried out at the CoPt@Co(OH)2-modified interface with and without magnetic support has shown that the magnetically co-stabilized interface was more stable even after 5 days of aging in 1 M KOH. This magnetism-assisted enhancement in the stability of a nanocatalyst-modified interface along with proper further developments will surely take the electrocatalysis of water splitting to a new level.

AB - Hydrogen generation via electrocatalytic water splitting is on the cutting edge of energy research. The kinetic burdens associated with the sluggish anodic oxygen evolution reaction (OER) and cathodic hydrogen evolution reaction (HER) cause a large amount of energy loss. Hence, these reactions must be catalyzed. Therefore, an array of magnetic CoPt nanoparticle (NP)-decorated ultrathin Co(OH)2 nanosheets was synthesized and applied for electrocatalytic water splitting in 1 M KOH. CoPt@Co(OH)2 required a minimum overpotential of 334 mV at 10 mA cm-2 in the OER and 226 mV at 50 mA cm-2 in the HER in addition to possessing exceptional stability upon cycling and chronoamperometry. The advantages of the magnetic property of CoPt@Co(OH)2 have been utilized for the first time to improve its stability. The aging study carried out at the CoPt@Co(OH)2-modified interface with and without magnetic support has shown that the magnetically co-stabilized interface was more stable even after 5 days of aging in 1 M KOH. This magnetism-assisted enhancement in the stability of a nanocatalyst-modified interface along with proper further developments will surely take the electrocatalysis of water splitting to a new level.

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