Sandwich-like MnOx/Ni1-xMnxOy@nanoporous nickel/MnOx architecture with high areal/volumetric capacitance

Hua Jun Qiu; Xiao Li; Hai Tao Xu; Yu Wang

doi:10.1016/j.electacta.2014.12.125

Sandwich-like MnO_x/Ni_1-xMn_xO_y@nanoporous nickel/MnO_x architecture with high areal/volumetric capacitance

Hua Jun Qiu^*
, Xiao Li
, Hai Tao Xu
, Yu Wang

^*Corresponding author for this work

Chongqing University

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

11 Scopus citations

Abstract

Hierarchical sandwich-like MnO_x/Ni_1-xMn_xO_y@nanoporous nickel/MnO_x nano-architecture was fabricated by dealloying a Ni₂₅Mn₇₅ precursor in 1.0 M (NH₄)₂SO₄ solution followed by electrochemical oxidation in 1.0 M KOH solution. The dealloying process would generate both uniform nanoporous structure (chemical dealloying) and nanoporous structure with big crack channels (electrochemical dealloying at high potentials) with similar ligament-pore size of less than 10 nm. The electrochemical oxidation process then generates Ni/Mn mixed oxides/hydroxides filled in the nanopores by oxidizing the highly active nanoscale NiMn alloy ligaments. At the same time, the dissolved Mn ions in the nanopores (produced during the dealloying process) will be oxidized to form Mn oxides/hydroxides nanosheets attached to the nanoporous Ni surface when they diffuse out of the nanopores.

Original language	English
Pages (from-to)	16-22
Number of pages	7
Journal	Electrochimica Acta
Volume	155
DOIs	https://doi.org/10.1016/j.electacta.2014.12.125
State	Published - 10 Feb 2015
Externally published	Yes

Keywords

dealloying
free-standing
hierarchical structure
nanoporous hybrid
supercapacitor

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10.1016/j.electacta.2014.12.125

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@article{99320a2127474064b6633dfc55e0486e,

title = "Sandwich-like MnOx/Ni1-xMnxOy@nanoporous nickel/MnOx architecture with high areal/volumetric capacitance",

abstract = "Hierarchical sandwich-like MnOx/Ni1-xMnxOy@nanoporous nickel/MnOx nano-architecture was fabricated by dealloying a Ni25Mn75 precursor in 1.0 M (NH4)2SO4 solution followed by electrochemical oxidation in 1.0 M KOH solution. The dealloying process would generate both uniform nanoporous structure (chemical dealloying) and nanoporous structure with big crack channels (electrochemical dealloying at high potentials) with similar ligament-pore size of less than 10 nm. The electrochemical oxidation process then generates Ni/Mn mixed oxides/hydroxides filled in the nanopores by oxidizing the highly active nanoscale NiMn alloy ligaments. At the same time, the dissolved Mn ions in the nanopores (produced during the dealloying process) will be oxidized to form Mn oxides/hydroxides nanosheets attached to the nanoporous Ni surface when they diffuse out of the nanopores.",

keywords = "dealloying, free-standing, hierarchical structure, nanoporous hybrid, supercapacitor",

author = "Qiu, \{Hua Jun\} and Xiao Li and Xu, \{Hai Tao\} and Yu Wang",

year = "2015",

month = feb,

day = "10",

doi = "10.1016/j.electacta.2014.12.125",

language = "英语",

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pages = "16--22",

journal = "Electrochimica Acta",

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T1 - Sandwich-like MnOx/Ni1-xMnxOy@nanoporous nickel/MnOx architecture with high areal/volumetric capacitance

AU - Qiu, Hua Jun

AU - Li, Xiao

AU - Xu, Hai Tao

AU - Wang, Yu

PY - 2015/2/10

Y1 - 2015/2/10

N2 - Hierarchical sandwich-like MnOx/Ni1-xMnxOy@nanoporous nickel/MnOx nano-architecture was fabricated by dealloying a Ni25Mn75 precursor in 1.0 M (NH4)2SO4 solution followed by electrochemical oxidation in 1.0 M KOH solution. The dealloying process would generate both uniform nanoporous structure (chemical dealloying) and nanoporous structure with big crack channels (electrochemical dealloying at high potentials) with similar ligament-pore size of less than 10 nm. The electrochemical oxidation process then generates Ni/Mn mixed oxides/hydroxides filled in the nanopores by oxidizing the highly active nanoscale NiMn alloy ligaments. At the same time, the dissolved Mn ions in the nanopores (produced during the dealloying process) will be oxidized to form Mn oxides/hydroxides nanosheets attached to the nanoporous Ni surface when they diffuse out of the nanopores.

AB - Hierarchical sandwich-like MnOx/Ni1-xMnxOy@nanoporous nickel/MnOx nano-architecture was fabricated by dealloying a Ni25Mn75 precursor in 1.0 M (NH4)2SO4 solution followed by electrochemical oxidation in 1.0 M KOH solution. The dealloying process would generate both uniform nanoporous structure (chemical dealloying) and nanoporous structure with big crack channels (electrochemical dealloying at high potentials) with similar ligament-pore size of less than 10 nm. The electrochemical oxidation process then generates Ni/Mn mixed oxides/hydroxides filled in the nanopores by oxidizing the highly active nanoscale NiMn alloy ligaments. At the same time, the dissolved Mn ions in the nanopores (produced during the dealloying process) will be oxidized to form Mn oxides/hydroxides nanosheets attached to the nanoporous Ni surface when they diffuse out of the nanopores.

KW - dealloying

KW - free-standing

KW - hierarchical structure

KW - nanoporous hybrid

KW - supercapacitor

UR - https://www.scopus.com/pages/publications/84920746823

U2 - 10.1016/j.electacta.2014.12.125

DO - 10.1016/j.electacta.2014.12.125

M3 - 文章

AN - SCOPUS:84920746823

SN - 0013-4686

VL - 155

SP - 16

EP - 22

JO - Electrochimica Acta

JF - Electrochimica Acta

ER -

Sandwich-like MnO_x/Ni_1-xMn_xO_y@nanoporous nickel/MnO_x architecture with high areal/volumetric capacitance

Abstract

Keywords

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