MnO2/MnCo2O4/Ni heterostructure with quadruple hierarchy: A bifunctional electrode architecture for overall urea oxidation

Changlong Xiao, Shuni Li, Xinyi Zhang, Douglas R. MacFarlane

Research output: Contribution to journalArticleResearchpeer-review

Abstract

A three-dimensional MnO2/MnCo2O4/Ni core-shell heterostructured electrode has been fabricated through a facile method. This electrode architecture consists of four levels of interconnected hierarchy: a primary macroporous Ni foam scaffold (≥500 μm), an intermediate vertically-aligned MnCo2O4 core-nanoflake array (50-100 nm), topmost ultra-thin MnO2 nanosheets (∼10 nm) and short-range ordered mesopores (∼5 nm) on the MnO2 nanosheets. This freestanding, hierarchical porous electrode has advantages in enhancing electroactive surface area, enabling efficient mass transport through the porous structure. The heterostructured electrode exhibits a low onset potential (1.33 V vs. RHE), a high anodic peak current density (1000 mA cm-2 g-1 at 1.7 V vs. RHE) and long-term catalytic stability for urea oxidation, which surpasses previous reported electrode materials for urea electrolysis. Remarkably, the MnO2/MnCo2O4/Ni electrode possesses bifunctional catalytic activity for both urea oxidation and hydrogen evolution. A urea electrolytic cell with both anode and cathode using the heterostructured electrodes has been fabricated and a current density of 10 mA cm-2 has been achieved at a cell voltage of 1.55 V. This noble metal-free quadruple hierarchy electrode shows potential as a new platform for multi-purpose applications.

Original languageEnglish
Pages (from-to)7825-7832
Number of pages8
JournalJournal of Materials Chemistry A
Volume5
Issue number17
DOIs
Publication statusPublished - 2017

Cite this

@article{e216f5ff24184d3ab89d9b0e553cddbc,
title = "MnO2/MnCo2O4/Ni heterostructure with quadruple hierarchy: A bifunctional electrode architecture for overall urea oxidation",
abstract = "A three-dimensional MnO2/MnCo2O4/Ni core-shell heterostructured electrode has been fabricated through a facile method. This electrode architecture consists of four levels of interconnected hierarchy: a primary macroporous Ni foam scaffold (≥500 μm), an intermediate vertically-aligned MnCo2O4 core-nanoflake array (50-100 nm), topmost ultra-thin MnO2 nanosheets (∼10 nm) and short-range ordered mesopores (∼5 nm) on the MnO2 nanosheets. This freestanding, hierarchical porous electrode has advantages in enhancing electroactive surface area, enabling efficient mass transport through the porous structure. The heterostructured electrode exhibits a low onset potential (1.33 V vs. RHE), a high anodic peak current density (1000 mA cm-2 g-1 at 1.7 V vs. RHE) and long-term catalytic stability for urea oxidation, which surpasses previous reported electrode materials for urea electrolysis. Remarkably, the MnO2/MnCo2O4/Ni electrode possesses bifunctional catalytic activity for both urea oxidation and hydrogen evolution. A urea electrolytic cell with both anode and cathode using the heterostructured electrodes has been fabricated and a current density of 10 mA cm-2 has been achieved at a cell voltage of 1.55 V. This noble metal-free quadruple hierarchy electrode shows potential as a new platform for multi-purpose applications.",
author = "Changlong Xiao and Shuni Li and Xinyi Zhang and MacFarlane, {Douglas R.}",
year = "2017",
doi = "10.1039/c7ta00980a",
language = "English",
volume = "5",
pages = "7825--7832",
journal = "Journal of Materials Chemistry A",
issn = "2050-7488",
publisher = "The Royal Society of Chemistry",
number = "17",

}

MnO2/MnCo2O4/Ni heterostructure with quadruple hierarchy : A bifunctional electrode architecture for overall urea oxidation. / Xiao, Changlong; Li, Shuni; Zhang, Xinyi; MacFarlane, Douglas R.

In: Journal of Materials Chemistry A, Vol. 5, No. 17, 2017, p. 7825-7832.

Research output: Contribution to journalArticleResearchpeer-review

TY - JOUR

T1 - MnO2/MnCo2O4/Ni heterostructure with quadruple hierarchy

T2 - A bifunctional electrode architecture for overall urea oxidation

AU - Xiao, Changlong

AU - Li, Shuni

AU - Zhang, Xinyi

AU - MacFarlane, Douglas R.

PY - 2017

Y1 - 2017

N2 - A three-dimensional MnO2/MnCo2O4/Ni core-shell heterostructured electrode has been fabricated through a facile method. This electrode architecture consists of four levels of interconnected hierarchy: a primary macroporous Ni foam scaffold (≥500 μm), an intermediate vertically-aligned MnCo2O4 core-nanoflake array (50-100 nm), topmost ultra-thin MnO2 nanosheets (∼10 nm) and short-range ordered mesopores (∼5 nm) on the MnO2 nanosheets. This freestanding, hierarchical porous electrode has advantages in enhancing electroactive surface area, enabling efficient mass transport through the porous structure. The heterostructured electrode exhibits a low onset potential (1.33 V vs. RHE), a high anodic peak current density (1000 mA cm-2 g-1 at 1.7 V vs. RHE) and long-term catalytic stability for urea oxidation, which surpasses previous reported electrode materials for urea electrolysis. Remarkably, the MnO2/MnCo2O4/Ni electrode possesses bifunctional catalytic activity for both urea oxidation and hydrogen evolution. A urea electrolytic cell with both anode and cathode using the heterostructured electrodes has been fabricated and a current density of 10 mA cm-2 has been achieved at a cell voltage of 1.55 V. This noble metal-free quadruple hierarchy electrode shows potential as a new platform for multi-purpose applications.

AB - A three-dimensional MnO2/MnCo2O4/Ni core-shell heterostructured electrode has been fabricated through a facile method. This electrode architecture consists of four levels of interconnected hierarchy: a primary macroporous Ni foam scaffold (≥500 μm), an intermediate vertically-aligned MnCo2O4 core-nanoflake array (50-100 nm), topmost ultra-thin MnO2 nanosheets (∼10 nm) and short-range ordered mesopores (∼5 nm) on the MnO2 nanosheets. This freestanding, hierarchical porous electrode has advantages in enhancing electroactive surface area, enabling efficient mass transport through the porous structure. The heterostructured electrode exhibits a low onset potential (1.33 V vs. RHE), a high anodic peak current density (1000 mA cm-2 g-1 at 1.7 V vs. RHE) and long-term catalytic stability for urea oxidation, which surpasses previous reported electrode materials for urea electrolysis. Remarkably, the MnO2/MnCo2O4/Ni electrode possesses bifunctional catalytic activity for both urea oxidation and hydrogen evolution. A urea electrolytic cell with both anode and cathode using the heterostructured electrodes has been fabricated and a current density of 10 mA cm-2 has been achieved at a cell voltage of 1.55 V. This noble metal-free quadruple hierarchy electrode shows potential as a new platform for multi-purpose applications.

UR - http://www.scopus.com/inward/record.url?scp=85022222397&partnerID=8YFLogxK

U2 - 10.1039/c7ta00980a

DO - 10.1039/c7ta00980a

M3 - Article

VL - 5

SP - 7825

EP - 7832

JO - Journal of Materials Chemistry A

JF - Journal of Materials Chemistry A

SN - 2050-7488

IS - 17

ER -