Triple-Shelled Co-VSe Hollow Nanocages as Superior Bifunctional Electrode Materials for Efficient Pt-Free Dye-Sensitized Solar Cells and Hydrogen Evolution Reactions.

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ID: 67429
2019
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Abstract
Complex nanostructures with distinct spatial architectures and more active sites hold broad prospects in new energy conversion fields. Herein, a facile strategy was carried out to construct triple-shelled Co-VSe nanocages, starting with an ion-exchange process between Co-based zeolitic imidazolate framework-67 (ZIF-67) nanopolyhedrons and VO followed by the formation of triple-shelled Co-VSe hollow nanocages during the process of increasing the solvothermal temperature under the assistance of SeO. Meanwhile, triple-shelled Co-VS and yolk-double shell Co-VO nanocages were fabricated as references by a similar process. Benefiting from the larger surface areas and more electrolyte adsorption sites, the triple-shelled Co-VSe nanocages exhibited excellent electrocatalytic performances when applied as the electrochemical catalysts for dye-sensitized solar cells (DSSC) and hydrogen evolution reactions (HER). More concretely, the DSSC based on the Co-VSe counter electrode showed outstanding power conversion efficiency of 9.68% when its Pt counterpart was 8.46%. Moreover, the Co-VSe electrocatalyst exhibited prominent HER performance with a low onset overpotential of 40 mV and a small Tafel slope of 39.1 mV dec in an acidic solution.
Reference Key
qian2019tripleshelledacs Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Qian, Xing;Wu, Weimin;Niu, Yudi;Yang, Jiahui;Xu, Chong;Wong, Kwok-Yin;
Journal ACS applied materials & interfaces
Year 2019
DOI
10.1021/acsami.9b16623
URL
Keywords
dye-sensitized solar cells co-vsex pt-free catalysts bifunctional electrocatalysts hydrogen evolution reactions triple-shelled nanocages

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