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Graphene Dots Embedded Phosphide Nanosheet-Assembled Tubular Arrays for Efficient and Stable Overall Water Splitting
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2017 (English)In: ACS Applied Materials and Interfaces, ISSN 1944-8244, E-ISSN 1944-8252, Vol. 9, no 29, p. 24600-24607Article in journal (Refereed) Published
Abstract [en]

Bifunctional electrocatalysts are highly desired for overall water splitting. Herein, the design and fabrication of three-dimensional (3D) hierarchical earth-abundant transition bimetallic phosphide arrays constructed by one-dimensional tubular array that was derived from assembling two-dimensional nanosheet framework has been reported by tailoring the Co/Ni ratio and tunable morphologies, and zero-dimensional (0D) graphene dots were embedded on Co-Ni phosphide matrix to construct 0D/2D tubular array as a highly efficient electrode in the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER). On the basis of advanced merits, such as the high surface-active sites, well-dispersed graphene dots, and enhanced electron transfer capacity as well as the confinement effect of the graphene dots on the nanosheets, the integrated GDs/Co0.8Ni0.2P tubular arrays as anode and cathode exhibit excellent OER and HER performance. By use of GDs/Co0.8Ni0.2 arrays in the two-electrode setup of the device, a remarkable electrocatalytic performance for full water splitting has been achieved with a high current density of 10 mA cm-2 at 1.54 V and outstanding long-term operation stability in an alkaline environment, indicating a promising system based on nonprecious-metal electrocatalysts toward potential practical devices of overall water splitting.

Place, publisher, year, edition, pages
AMER CHEMICAL SOC , 2017. Vol. 9, no 29, p. 24600-24607
Keywords [en]
graphene dots, transition bimetallic phosphide, oxygen evolution reaction, hydrogen evolution reaction, overall water splitting
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Other Chemical Engineering
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URN: urn:nbn:se:kth:diva-212343DOI: 10.1021/acsami.7b06231ISI: 000406646300025Scopus ID: 2-s2.0-85026310371OAI: oai:DiVA.org:kth-212343DiVA, id: diva2:1135478
Note

QC 20170823

Available from: 2017-08-23 Created: 2017-08-23 Last updated: 2017-08-23Bibliographically approved

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Chen, HongSun, Licheng

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Organic ChemistryCentre of Molecular Devices, CMDTheoretical Chemistry and BiologyZhejiang-KTH Joint Research Center of Photonics, JORCEP
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