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Codoping-Induced, Rhombus-Shaped Co3O4 Nanosheets as an Active Electrode Material for Oxygen Evolution
South Univ Sci & Technol China, Dept Elect & Elect Engn, Shenzhen 518055, Peoples R China.;SUSTC, Shenzhen Key Lab Generat Semicond Devices 3, Shenzhen 518055, Peoples R China..
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Kemiska sektionen, Institutionen för kemi - Ångström, Fysikalisk kemi. Uppsala Univ, Dept Chem, Ctr Mol Devices, Phys Chem,Angstrom Lab, SE-75120 Uppsala, Sweden..
South Univ Sci & Technol China, Dept Elect & Elect Engn, Shenzhen 518055, Peoples R China.;SUSTC, Shenzhen Key Lab Generat Semicond Devices 3, Shenzhen 518055, Peoples R China..
2015 (engelsk)Inngår i: ACS Applied Materials and Interfaces, ISSN 1944-8244, E-ISSN 1944-8252, Vol. 7, nr 39, s. 21745-21750Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Nanostructured Co3O4 doped with Zn2+, Ni2+, and both were directly grown on an ITO substrate by an easily available hydrothermal method. The doped Co3O4 showed a unique structural morphology evolution upon controlling the doping elements and the doping ratio of the cations. For the codoped samples, the novel rhombus-shaped Co3O4 nanosheets doped with Zn2+ and Ni2+ (concentration ratio of 1:2) exhibited the optimal electrocatalytic performance. The sample showed a current density of 165 mA cm(-2) at 1.75 V, approximately 1.6 and 4 times higher than that of samples doped with Zn2+ and Ni2+ at a concentration ratio of 1:1 and 1:3. The unique architecture and its corresponding modified physical properties, such as high active-site density created by codoping, large structural porosity, and high roughness, are together responsible to its superior performance. For codoped Co3O4 nanostructures, Zn2+ facilitates the creation of Co cations in their high oxidation state as active centers, while Ni2+ contributed to the new active sites with lower activation energy. The synergistic effect of Zn2+ and Ni2+ doping can explain the improved physicochemical properties of codoped Co3O4 nanostructures.

sted, utgiver, år, opplag, sider
2015. Vol. 7, nr 39, s. 21745-21750
Emneord [en]
water splitting, oxygen evolution reaction, electrocatalysis, codoped Co3O4, nanostructures
HSV kategori
Identifikatorer
URN: urn:nbn:se:uu:diva-265820DOI: 10.1021/acsami.5b05149ISI: 000362628900018PubMedID: 26383787OAI: oai:DiVA.org:uu-265820DiVA, id: diva2:866636
Tilgjengelig fra: 2015-11-03 Laget: 2015-11-03 Sist oppdatert: 2017-12-01

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