In situ segregation of cobalt nanoparticles on VN nanosheets via nitriding of Co2V2O7 nanosheets as efficient oxygen evolution reaction electrocatalysts

Xiang Peng; Lei Wang; Liangsheng Hu; Yong Li; Biao Gao; Hao Song; Chao Huang; Xuming Zhang; Jijiang Fu; Kaifu Huo; Paul K. Chu

doi:10.1016/j.nanoen.2017.02.016

In situ segregation of cobalt nanoparticles on VN nanosheets via nitriding of Co₂V₂O₇ nanosheets as efficient oxygen evolution reaction electrocatalysts

Xiang Peng, Lei Wang, Liangsheng Hu, Yong Li, Biao Gao, Hao Song, Chao Huang, Xuming Zhang, Jijiang Fu, Kaifu Huo^*, Paul K. Chu^*

^*Corresponding author for this work

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

129 Citations (Scopus)

Abstract

Metallic Cobalt nanoparticles segregated in situ on conductive vanadium nitride (Co/VN) nanosheets synthesized by ammonia nitridation of hydrothermally prepared Co₂V₂O₇ nanosheets are investigated as high-performance oxygen evolution reaction (OER) electrocatalysts. The metallic Co nanoparticles with a large number of exposed active sites are distributed uniformly and adhere firmly to the VN substrate to enhance the OER efficiency, facilitate fast charge transfer, and improve the stability. As a result, a small overpotential of 320 mV is required to achieve a current density of 10 mA cm⁻² with a small Tafel slope of 55 mV dec⁻¹. The excellent stability is indicated by an overpotential shift of only 34 mV after 2000 cyclic voltammetry cycles at a large current density of 200 mA cm⁻². The precious-metal-free Co/VN nanosheets deliver outstanding OER performance and are promising as electrocatalysts in water splitting and related applications.

Original language	English
Pages (from-to)	1-7
Journal	Nano Energy
Volume	34
Online published	12 Feb 2017
DOIs	https://doi.org/10.1016/j.nanoen.2017.02.016
Publication status	Published - Apr 2017

Research Keywords

Cobalt nanoparticles
In situ segregation
Oxygen evolution reaction
VN nanosheets
Water splitting

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@article{84ea988cdd0444c6805af2cc2ff8e329,

title = "In situ segregation of cobalt nanoparticles on VN nanosheets via nitriding of Co2V2O7 nanosheets as efficient oxygen evolution reaction electrocatalysts",

abstract = "Metallic Cobalt nanoparticles segregated in situ on conductive vanadium nitride (Co/VN) nanosheets synthesized by ammonia nitridation of hydrothermally prepared Co2V2O7 nanosheets are investigated as high-performance oxygen evolution reaction (OER) electrocatalysts. The metallic Co nanoparticles with a large number of exposed active sites are distributed uniformly and adhere firmly to the VN substrate to enhance the OER efficiency, facilitate fast charge transfer, and improve the stability. As a result, a small overpotential of 320 mV is required to achieve a current density of 10 mA cm−2 with a small Tafel slope of 55 mV dec−1. The excellent stability is indicated by an overpotential shift of only 34 mV after 2000 cyclic voltammetry cycles at a large current density of 200 mA cm−2. The precious-metal-free Co/VN nanosheets deliver outstanding OER performance and are promising as electrocatalysts in water splitting and related applications.",

keywords = "Cobalt nanoparticles, In situ segregation, Oxygen evolution reaction, VN nanosheets, Water splitting",

author = "Xiang Peng and Lei Wang and Liangsheng Hu and Yong Li and Biao Gao and Hao Song and Chao Huang and Xuming Zhang and Jijiang Fu and Kaifu Huo and Chu, {Paul K.}",

year = "2017",

month = apr,

doi = "10.1016/j.nanoen.2017.02.016",

language = "English",

volume = "34",

pages = "1--7",

journal = "Nano Energy",

issn = "2211-2855",

publisher = "Elsevier B.V.",

}

TY - JOUR

T1 - In situ segregation of cobalt nanoparticles on VN nanosheets via nitriding of Co2V2O7 nanosheets as efficient oxygen evolution reaction electrocatalysts

AU - Peng, Xiang

AU - Wang, Lei

AU - Hu, Liangsheng

AU - Li, Yong

AU - Gao, Biao

AU - Song, Hao

AU - Huang, Chao

AU - Zhang, Xuming

AU - Fu, Jijiang

AU - Huo, Kaifu

AU - Chu, Paul K.

PY - 2017/4

Y1 - 2017/4

N2 - Metallic Cobalt nanoparticles segregated in situ on conductive vanadium nitride (Co/VN) nanosheets synthesized by ammonia nitridation of hydrothermally prepared Co2V2O7 nanosheets are investigated as high-performance oxygen evolution reaction (OER) electrocatalysts. The metallic Co nanoparticles with a large number of exposed active sites are distributed uniformly and adhere firmly to the VN substrate to enhance the OER efficiency, facilitate fast charge transfer, and improve the stability. As a result, a small overpotential of 320 mV is required to achieve a current density of 10 mA cm−2 with a small Tafel slope of 55 mV dec−1. The excellent stability is indicated by an overpotential shift of only 34 mV after 2000 cyclic voltammetry cycles at a large current density of 200 mA cm−2. The precious-metal-free Co/VN nanosheets deliver outstanding OER performance and are promising as electrocatalysts in water splitting and related applications.

AB - Metallic Cobalt nanoparticles segregated in situ on conductive vanadium nitride (Co/VN) nanosheets synthesized by ammonia nitridation of hydrothermally prepared Co2V2O7 nanosheets are investigated as high-performance oxygen evolution reaction (OER) electrocatalysts. The metallic Co nanoparticles with a large number of exposed active sites are distributed uniformly and adhere firmly to the VN substrate to enhance the OER efficiency, facilitate fast charge transfer, and improve the stability. As a result, a small overpotential of 320 mV is required to achieve a current density of 10 mA cm−2 with a small Tafel slope of 55 mV dec−1. The excellent stability is indicated by an overpotential shift of only 34 mV after 2000 cyclic voltammetry cycles at a large current density of 200 mA cm−2. The precious-metal-free Co/VN nanosheets deliver outstanding OER performance and are promising as electrocatalysts in water splitting and related applications.

KW - Cobalt nanoparticles

KW - In situ segregation

KW - Oxygen evolution reaction

KW - VN nanosheets

KW - Water splitting

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U2 - 10.1016/j.nanoen.2017.02.016

DO - 10.1016/j.nanoen.2017.02.016

M3 - RGC 21 - Publication in refereed journal

SN - 2211-2855

VL - 34

SP - 1

EP - 7

JO - Nano Energy

JF - Nano Energy

ER -