Carbon-layer-protected cuprous oxide nanowire arrays for efficient water reduction

Handle URI:
http://hdl.handle.net/10754/562661
Title:
Carbon-layer-protected cuprous oxide nanowire arrays for efficient water reduction
Authors:
Zhang, Zhonghai; Dua, Rubal; Zhang, Lianbin ( 0000-0002-8548-1506 ) ; Zhu, Haibo; Zhang, Hongnan; Wang, Peng ( 0000-0003-0856-0865 )
Abstract:
In this work, we propose a solution-based carbon precursor coating and subsequent carbonization strategy to form a thin protective carbon layer on unstable semiconductor nanostructures as a solution to the commonly occurring photocorrosion problem of many semiconductors. A proof-of-concept is provided by using glucose as the carbon precursor to form a protective carbon coating onto cuprous oxide (Cu2O) nanowire arrays which were synthesized from copper mesh. The carbon-layer-protected Cu2O nanowire arrays exhibited remarkably improved photostability as well as considerably enhanced photocurrent density. The Cu2O nanowire arrays coated with a carbon layer of 20 nm thickness were found to give an optimal water splitting performance, producing a photocurrent density of -3.95 mA cm-2 and an optimal photocathode efficiency of 0.56% under illumination of AM 1.5G (100 mW cm-2). This is the highest value ever reported for a Cu 2O-based electrode coated with a metal/co-catalyst-free protective layer. The photostability, measured as the percentage of the photocurrent density at the end of 20 min measurement period relative to that at the beginning of the measurement, improved from 12.6% on the bare, nonprotected Cu2O nanowire arrays to 80.7% on the continuous carbon coating protected ones, more than a 6-fold increase. We believe that the facile strategy presented in this work is a general approach that can address the stability issue of many nonstable photoelectrodes and thus has the potential to make a meaningful contribution in the general field of energy conversion. © 2013 American Chemical Society.
KAUST Department:
Biological and Environmental Sciences and Engineering (BESE) Division; Environmental Science and Engineering Program; Water Desalination and Reuse Research Center (WDRC); KAUST Catalysis Center (KCC); Physical Sciences and Engineering (PSE) Division; Water Desalination & Reuse Research Cntr; Environmental Nanotechnology Lab
Publisher:
American Chemical Society
Journal:
ACS Nano
Issue Date:
26-Feb-2013
DOI:
10.1021/nn3057092
PubMed ID:
23363436
Type:
Article
ISSN:
19360851
Sponsors:
The authors are grateful to KAUST for providing very generous financial support. We thank Prof. Micheal Gratzel for valuable discussion on photoconversion efficiency calculation.
Appears in Collections:
Articles; Environmental Science and Engineering Program; Physical Sciences and Engineering (PSE) Division; KAUST Catalysis Center (KCC); Water Desalination and Reuse Research Center (WDRC); Biological and Environmental Sciences and Engineering (BESE) Division

Full metadata record

DC FieldValue Language
dc.contributor.authorZhang, Zhonghaien
dc.contributor.authorDua, Rubalen
dc.contributor.authorZhang, Lianbinen
dc.contributor.authorZhu, Haiboen
dc.contributor.authorZhang, Hongnanen
dc.contributor.authorWang, Pengen
dc.date.accessioned2015-08-03T11:00:17Zen
dc.date.available2015-08-03T11:00:17Zen
dc.date.issued2013-02-26en
dc.identifier.issn19360851en
dc.identifier.pmid23363436en
dc.identifier.doi10.1021/nn3057092en
dc.identifier.urihttp://hdl.handle.net/10754/562661en
dc.description.abstractIn this work, we propose a solution-based carbon precursor coating and subsequent carbonization strategy to form a thin protective carbon layer on unstable semiconductor nanostructures as a solution to the commonly occurring photocorrosion problem of many semiconductors. A proof-of-concept is provided by using glucose as the carbon precursor to form a protective carbon coating onto cuprous oxide (Cu2O) nanowire arrays which were synthesized from copper mesh. The carbon-layer-protected Cu2O nanowire arrays exhibited remarkably improved photostability as well as considerably enhanced photocurrent density. The Cu2O nanowire arrays coated with a carbon layer of 20 nm thickness were found to give an optimal water splitting performance, producing a photocurrent density of -3.95 mA cm-2 and an optimal photocathode efficiency of 0.56% under illumination of AM 1.5G (100 mW cm-2). This is the highest value ever reported for a Cu 2O-based electrode coated with a metal/co-catalyst-free protective layer. The photostability, measured as the percentage of the photocurrent density at the end of 20 min measurement period relative to that at the beginning of the measurement, improved from 12.6% on the bare, nonprotected Cu2O nanowire arrays to 80.7% on the continuous carbon coating protected ones, more than a 6-fold increase. We believe that the facile strategy presented in this work is a general approach that can address the stability issue of many nonstable photoelectrodes and thus has the potential to make a meaningful contribution in the general field of energy conversion. © 2013 American Chemical Society.en
dc.description.sponsorshipThe authors are grateful to KAUST for providing very generous financial support. We thank Prof. Micheal Gratzel for valuable discussion on photoconversion efficiency calculation.en
dc.publisherAmerican Chemical Societyen
dc.subjectcarbon layeren
dc.subjectcuprous oxideen
dc.subjectnanowireen
dc.subjectphotocathodeen
dc.subjectphotocorrosionen
dc.subjectwater splittingen
dc.titleCarbon-layer-protected cuprous oxide nanowire arrays for efficient water reductionen
dc.typeArticleen
dc.contributor.departmentBiological and Environmental Sciences and Engineering (BESE) Divisionen
dc.contributor.departmentEnvironmental Science and Engineering Programen
dc.contributor.departmentWater Desalination and Reuse Research Center (WDRC)en
dc.contributor.departmentKAUST Catalysis Center (KCC)en
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Divisionen
dc.contributor.departmentWater Desalination & Reuse Research Cntren
dc.contributor.departmentEnvironmental Nanotechnology Laben
dc.identifier.journalACS Nanoen
kaust.authorZhang, Zhonghaien
kaust.authorDua, Rubalen
kaust.authorZhang, Lianbinen
kaust.authorZhu, Haiboen
kaust.authorZhang, Hongnanen
kaust.authorWang, Pengen

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