Phase-controllable synthesis of cobalt hydroxide for electrocatalytic oxygen evolution

Fenglei Lyu; Yaocai Bai; Qingfa Wang; Li Wang; Xiangwen Zhang; Yadong Yin

doi:10.1039/c7dt01110e

Phase-controllable synthesis of cobalt hydroxide for electrocatalytic oxygen evolution

Fenglei Lyu, Yaocai Bai, Qingfa Wang, Li Wang, Xiangwen Zhang, Yadong Yin

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

73 Scopus citations

Abstract

Identification of active sites for oxygen evolution reaction (OER) plays a key role in the design and fabrication of high-performance cobalt-based electrocatalysts. Herein, we report the synthesis of two types of two-dimensional monometallic cobalt hydroxide nanoplates in aqueous solution for OER: α-Co(OH)₂ with both Co²⁺_Td and Co²⁺_Oh sites and β-Co(OH)₂ with Co²⁺_Oh sites. Electrochemical characterization reveals that α-Co(OH)₂ is more active than β-Co(OH)₂ towards OER. The better activity can be attributed to the presence of Co²⁺_Td sites in α-Co(OH)₂, which are more active than Co²⁺_Oh sites. Our finding clarifies the contribution of the two catalytic sites and helps future rational design of high-performance OER electrocatalysts.

Original language	English
Pages (from-to)	10545-10548
Number of pages	4
Journal	Dalton Transactions
Volume	46
Issue number	32
DOIs	https://doi.org/10.1039/c7dt01110e
State	Published - 2017
Externally published	Yes

Funding

The Donors of the American Chemical Society Petroleum Research Fund are acknowledged for partial support of this research. Wang acknowledges the funding support from the National Natural Science Foundation of China (21203137). Lyu thanks the financial support from the China Scholarship Council.

Funders	Funder number
American Chemical Society Petroleum Research Fund
National Natural Science Foundation of China	21203137
China Scholarship Council

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title = "Phase-controllable synthesis of cobalt hydroxide for electrocatalytic oxygen evolution",

abstract = "Identification of active sites for oxygen evolution reaction (OER) plays a key role in the design and fabrication of high-performance cobalt-based electrocatalysts. Herein, we report the synthesis of two types of two-dimensional monometallic cobalt hydroxide nanoplates in aqueous solution for OER: α-Co(OH)2 with both Co2+Td and Co2+Oh sites and β-Co(OH)2 with Co2+Oh sites. Electrochemical characterization reveals that α-Co(OH)2 is more active than β-Co(OH)2 towards OER. The better activity can be attributed to the presence of Co2+Td sites in α-Co(OH)2, which are more active than Co2+Oh sites. Our finding clarifies the contribution of the two catalytic sites and helps future rational design of high-performance OER electrocatalysts.",

author = "Fenglei Lyu and Yaocai Bai and Qingfa Wang and Li Wang and Xiangwen Zhang and Yadong Yin",

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T1 - Phase-controllable synthesis of cobalt hydroxide for electrocatalytic oxygen evolution

AU - Lyu, Fenglei

AU - Bai, Yaocai

AU - Wang, Qingfa

AU - Wang, Li

AU - Zhang, Xiangwen

AU - Yin, Yadong

PY - 2017

Y1 - 2017

N2 - Identification of active sites for oxygen evolution reaction (OER) plays a key role in the design and fabrication of high-performance cobalt-based electrocatalysts. Herein, we report the synthesis of two types of two-dimensional monometallic cobalt hydroxide nanoplates in aqueous solution for OER: α-Co(OH)2 with both Co2+Td and Co2+Oh sites and β-Co(OH)2 with Co2+Oh sites. Electrochemical characterization reveals that α-Co(OH)2 is more active than β-Co(OH)2 towards OER. The better activity can be attributed to the presence of Co2+Td sites in α-Co(OH)2, which are more active than Co2+Oh sites. Our finding clarifies the contribution of the two catalytic sites and helps future rational design of high-performance OER electrocatalysts.

AB - Identification of active sites for oxygen evolution reaction (OER) plays a key role in the design and fabrication of high-performance cobalt-based electrocatalysts. Herein, we report the synthesis of two types of two-dimensional monometallic cobalt hydroxide nanoplates in aqueous solution for OER: α-Co(OH)2 with both Co2+Td and Co2+Oh sites and β-Co(OH)2 with Co2+Oh sites. Electrochemical characterization reveals that α-Co(OH)2 is more active than β-Co(OH)2 towards OER. The better activity can be attributed to the presence of Co2+Td sites in α-Co(OH)2, which are more active than Co2+Oh sites. Our finding clarifies the contribution of the two catalytic sites and helps future rational design of high-performance OER electrocatalysts.

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Phase-controllable synthesis of cobalt hydroxide for electrocatalytic oxygen evolution

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