Galvanic exchange carving growth of Co–Fe LDHs with enhanced water oxidation

Yaming Ma; Ke Wang; Ye Chen; Xuxiao Yang; Shuang Zhao; Kai Xi; Sanmu Xie; Shujiang Ding; Chunhui Xiao

doi:10.1016/j.ijhydene.2019.05.162

Galvanic exchange carving growth of Co–Fe LDHs with enhanced water oxidation

Yaming Ma, Ke Wang, Ye Chen, Xuxiao Yang, Shuang Zhao, Kai Xi, Sanmu Xie, Shujiang Ding, Chunhui Xiao

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

18 Scopus citations

Abstract

Preparing high-efficiency electrocatalyst through facile, low energy consumptive, and time-effective strategy is essential to the hydrogen generation via water electrolysis. Here, we report a galvanic replacement-mediated synthesis of highly active Co–Fe layered double hydroxides (Co–Fe LDHs) at room temperature as advanced electrocatalyst for water oxidation. The disc-like Co precursors were the first proposed as self-sacrificing templates for Co–Fe LDHs. By steady control of the carving of iron ions, the disc-like Co precursors are carved relaxedly and then formed to nanosheet-constructed Co–Fe LDHs. The Fe (II) ion is proved to a more preferable iron precursor than Fe (III) ion for Co–Fe LDHs nanosheets growth, owing to the “slow-growth” process. This catalyst shows a highly electrocatalytic activity towards the OER with low overpotential (η10 mA cm^-2 = 270 mV), low Tafel slope (48.7 mV dec-1), and remarkable long-time stability.

Original language	English
Pages (from-to)	20085-20092
Number of pages	8
Journal	International Journal of Hydrogen Energy
Volume	44
Issue number	36
DOIs	https://doi.org/10.1016/j.ijhydene.2019.05.162
State	Published - 26 Jul 2019
Externally published	Yes

Keywords

Electrochemistry
Energy conversion
Galvanic replacement
Iron
Layered double hydroxides
Water oxidation

UN SDGs

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

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10.1016/j.ijhydene.2019.05.162

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title = "Galvanic exchange carving growth of Co–Fe LDHs with enhanced water oxidation",

abstract = "Preparing high-efficiency electrocatalyst through facile, low energy consumptive, and time-effective strategy is essential to the hydrogen generation via water electrolysis. Here, we report a galvanic replacement-mediated synthesis of highly active Co–Fe layered double hydroxides (Co–Fe LDHs) at room temperature as advanced electrocatalyst for water oxidation. The disc-like Co precursors were the first proposed as self-sacrificing templates for Co–Fe LDHs. By steady control of the carving of iron ions, the disc-like Co precursors are carved relaxedly and then formed to nanosheet-constructed Co–Fe LDHs. The Fe (II) ion is proved to a more preferable iron precursor than Fe (III) ion for Co–Fe LDHs nanosheets growth, owing to the “slow-growth” process. This catalyst shows a highly electrocatalytic activity towards the OER with low overpotential (η10 mA cm-2 = 270 mV), low Tafel slope (48.7 mV dec-1), and remarkable long-time stability.",

keywords = "Electrochemistry, Energy conversion, Galvanic replacement, Iron, Layered double hydroxides, Water oxidation",

author = "Yaming Ma and Ke Wang and Ye Chen and Xuxiao Yang and Shuang Zhao and Kai Xi and Sanmu Xie and Shujiang Ding and Chunhui Xiao",

note = "Publisher Copyright: {\textcopyright} 2019 Hydrogen Energy Publications LLC",

year = "2019",

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TY - JOUR

T1 - Galvanic exchange carving growth of Co–Fe LDHs with enhanced water oxidation

AU - Ma, Yaming

AU - Wang, Ke

AU - Chen, Ye

AU - Yang, Xuxiao

AU - Zhao, Shuang

AU - Xi, Kai

AU - Xie, Sanmu

AU - Ding, Shujiang

AU - Xiao, Chunhui

PY - 2019/7/26

Y1 - 2019/7/26

N2 - Preparing high-efficiency electrocatalyst through facile, low energy consumptive, and time-effective strategy is essential to the hydrogen generation via water electrolysis. Here, we report a galvanic replacement-mediated synthesis of highly active Co–Fe layered double hydroxides (Co–Fe LDHs) at room temperature as advanced electrocatalyst for water oxidation. The disc-like Co precursors were the first proposed as self-sacrificing templates for Co–Fe LDHs. By steady control of the carving of iron ions, the disc-like Co precursors are carved relaxedly and then formed to nanosheet-constructed Co–Fe LDHs. The Fe (II) ion is proved to a more preferable iron precursor than Fe (III) ion for Co–Fe LDHs nanosheets growth, owing to the “slow-growth” process. This catalyst shows a highly electrocatalytic activity towards the OER with low overpotential (η10 mA cm-2 = 270 mV), low Tafel slope (48.7 mV dec-1), and remarkable long-time stability.

AB - Preparing high-efficiency electrocatalyst through facile, low energy consumptive, and time-effective strategy is essential to the hydrogen generation via water electrolysis. Here, we report a galvanic replacement-mediated synthesis of highly active Co–Fe layered double hydroxides (Co–Fe LDHs) at room temperature as advanced electrocatalyst for water oxidation. The disc-like Co precursors were the first proposed as self-sacrificing templates for Co–Fe LDHs. By steady control of the carving of iron ions, the disc-like Co precursors are carved relaxedly and then formed to nanosheet-constructed Co–Fe LDHs. The Fe (II) ion is proved to a more preferable iron precursor than Fe (III) ion for Co–Fe LDHs nanosheets growth, owing to the “slow-growth” process. This catalyst shows a highly electrocatalytic activity towards the OER with low overpotential (η10 mA cm-2 = 270 mV), low Tafel slope (48.7 mV dec-1), and remarkable long-time stability.

KW - Electrochemistry

KW - Energy conversion

KW - Galvanic replacement

KW - Iron

KW - Layered double hydroxides

KW - Water oxidation

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DO - 10.1016/j.ijhydene.2019.05.162

M3 - 文章

AN - SCOPUS:85067182809

SN - 0360-3199

VL - 44

SP - 20085

EP - 20092

JO - International Journal of Hydrogen Energy

JF - International Journal of Hydrogen Energy

IS - 36

ER -

Galvanic exchange carving growth of Co–Fe LDHs with enhanced water oxidation

Abstract

Keywords

UN SDGs

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