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

21 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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@article{082049216c0d46ba89f9a2d429f69447,

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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day = "26",

doi = "10.1016/j.ijhydene.2019.05.162",

language = "英语",

volume = "44",

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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

UR - https://www.scopus.com/pages/publications/85067182809

U2 - 10.1016/j.ijhydene.2019.05.162

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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