Highly acid-durable carbon coated Co3O4 nanoarrays as efficient oxygen evolution electrocatalysts

Handle URI:
http://hdl.handle.net/10754/608641
Title:
Highly acid-durable carbon coated Co3O4 nanoarrays as efficient oxygen evolution electrocatalysts
Authors:
Yang, Xiulin ( 0000-0003-2642-4963 ) ; Li, Henan; Lu, Ang-Yu; Min, Shixiong ( 0000-0001-6248-8804 ) ; Idriss, Zacharie; Hedhili, Mohamed N. ( 0000-0002-3624-036X ) ; Huang, Kuo-Wei ( 0000-0003-1900-2658 ) ; Idriss, Hicham; Li, Lain-Jong ( 0000-0002-4059-7783 )
Abstract:
Most oxygen evolution reaction (OER) electrocatalysts are not stable in corrosive acids. Even the expensive RuO2 or IrO2, the most acid-resistant oxides, can be dissolved at an oxidative potential. Herein, we realize that the failures of OER catalysts are mostly caused by the weak interface between catalysts and the substrates. Hence, the study of the interface structure between catalysts and substrates is critical. In this work, we observe that the cheap OER catalysts Co3O4 can be more durable than the state-of-the-art RuO2 if the interface quality is good enough. The Co3O4 nanosheets deposited on carbon paper (Co3O4/CP) is prepared by electroplating of Co-species and followed by a two-step calcination process. The 1st step occurs in vacuum in order to maintain the surface integrity of the carbon paper and converts Co-species to Co(II)O. The 2nd step is a calcination in ambient conditions which enables the complete transformation of Co(II)O to Co3O4 without degrading the mechanical strength of the Co3O4-CP interface. Equally important, an in situ formation of a layer of amorphous carbon on top of Co3O4 further enhances the OER catalyst stability. Therefore, these key advances make the Co3O4 catalyst highly active toward the OER in 0.5 M H2SO4 with a small overpotential (370 mV), to reach 10 mA/cm2. The observed long lifetime for 86.8 h at a constant current density of 100 mA/cm2, is among the best of the reported in literature so far, even longer than the state-of-art RuO2 on CP. Overall, our study provides a new insight and methodology for the construction of a high-performance and high stability OER electrocatalysts in corrosive acidic environments.
KAUST Department:
Physical Sciences and Engineering (PSE) Division; KAUST Catalysis Center (KCC)
Citation:
Highly acid-durable carbon coated Co3O4 nanoarrays as efficient oxygen evolution electrocatalysts 2016, 25:42 Nano Energy
Publisher:
Elsevier BV
Journal:
Nano Energy
Issue Date:
21-Apr-2016
DOI:
10.1016/j.nanoen.2016.04.035
Type:
Article
ISSN:
22112855
Sponsors:
This research was supported by KAUST and SABIC, Saudi Arabia.
Additional Links:
http://linkinghub.elsevier.com/retrieve/pii/S2211285516300891
Appears in Collections:
Articles; Physical Sciences and Engineering (PSE) Division; KAUST Catalysis Center (KCC)

Full metadata record

DC FieldValue Language
dc.contributor.authorYang, Xiulinen
dc.contributor.authorLi, Henanen
dc.contributor.authorLu, Ang-Yuen
dc.contributor.authorMin, Shixiongen
dc.contributor.authorIdriss, Zacharieen
dc.contributor.authorHedhili, Mohamed N.en
dc.contributor.authorHuang, Kuo-Weien
dc.contributor.authorIdriss, Hichamen
dc.contributor.authorLi, Lain-Jongen
dc.date.accessioned2016-05-09T06:30:43Zen
dc.date.available2016-05-09T06:30:43Zen
dc.date.issued2016-04-21en
dc.identifier.citationHighly acid-durable carbon coated Co3O4 nanoarrays as efficient oxygen evolution electrocatalysts 2016, 25:42 Nano Energyen
dc.identifier.issn22112855en
dc.identifier.doi10.1016/j.nanoen.2016.04.035en
dc.identifier.urihttp://hdl.handle.net/10754/608641en
dc.description.abstractMost oxygen evolution reaction (OER) electrocatalysts are not stable in corrosive acids. Even the expensive RuO2 or IrO2, the most acid-resistant oxides, can be dissolved at an oxidative potential. Herein, we realize that the failures of OER catalysts are mostly caused by the weak interface between catalysts and the substrates. Hence, the study of the interface structure between catalysts and substrates is critical. In this work, we observe that the cheap OER catalysts Co3O4 can be more durable than the state-of-the-art RuO2 if the interface quality is good enough. The Co3O4 nanosheets deposited on carbon paper (Co3O4/CP) is prepared by electroplating of Co-species and followed by a two-step calcination process. The 1st step occurs in vacuum in order to maintain the surface integrity of the carbon paper and converts Co-species to Co(II)O. The 2nd step is a calcination in ambient conditions which enables the complete transformation of Co(II)O to Co3O4 without degrading the mechanical strength of the Co3O4-CP interface. Equally important, an in situ formation of a layer of amorphous carbon on top of Co3O4 further enhances the OER catalyst stability. Therefore, these key advances make the Co3O4 catalyst highly active toward the OER in 0.5 M H2SO4 with a small overpotential (370 mV), to reach 10 mA/cm2. The observed long lifetime for 86.8 h at a constant current density of 100 mA/cm2, is among the best of the reported in literature so far, even longer than the state-of-art RuO2 on CP. Overall, our study provides a new insight and methodology for the construction of a high-performance and high stability OER electrocatalysts in corrosive acidic environments.en
dc.description.sponsorshipThis research was supported by KAUST and SABIC, Saudi Arabia.en
dc.language.isoenen
dc.publisherElsevier BVen
dc.relation.urlhttp://linkinghub.elsevier.com/retrieve/pii/S2211285516300891en
dc.rightsNOTICE: this is the author’s version of a work that was accepted for publication in Nano Energy. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Nano Energy, 21 April 2016. DOI: 10.1016/j.nanoen.2016.04.035en
dc.subjectOxygen evolution reactionen
dc.subjectCarbon coated Co3O4en
dc.subjectElectrolysisen
dc.subjectCatalysisen
dc.titleHighly acid-durable carbon coated Co3O4 nanoarrays as efficient oxygen evolution electrocatalystsen
dc.typeArticleen
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Divisionen
dc.contributor.departmentKAUST Catalysis Center (KCC)en
dc.identifier.journalNano Energyen
dc.eprint.versionPost-printen
dc.contributor.institutionSABIC, Corporate Research and Innovation (KAUST), Saudi Arabiaen
dc.contributor.affiliationKing Abdullah University of Science and Technology (KAUST)en
kaust.authorYang, Xiulinen
kaust.authorLi, Henanen
kaust.authorLu, Ang-Yuen
kaust.authorMin, Shixiongen
kaust.authorHedhili, Mohamed N.en
kaust.authorHuang, Kuo-Weien
kaust.authorLi, Lain-Jong.en
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