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Title: Heterojunction‐assisted Co3S4@Co3O4 core – shell octahedrons for supercapacitors and both oxygen and carbon dioxide reduction reactions
Authors: Yan, Yibo
Li, Kaixin
Chen, Xiaoping
Yang, Yanhui
Lee, Jong-Min
Keywords: Engineering::Chemical engineering
Issue Date: 2017
Source: Yan, Y., Li, K., Chen, X., Yang, Y., & Lee, J.-M. (2017). Heterojunction‐assisted Co3S4@Co3O4 core – shell octahedrons for supercapacitors and both oxygen and carbon dioxide reduction reactions. Small, 13(47), 1701724-. doi:10.1002/smll.201701724
Journal: Small
Abstract: Expedition of electron transfer efficiency and optimization of surface reactant adsorption products desorption processes are two main challenges for developing non-noble catalysts in the oxygen reduction reaction (ORR) and CO2 reduction reaction (CRR). A heterojunction prototype on Co3 S4 @Co3 O4 core-shell octahedron structure is established via hydrothermal lattice anion exchange protocol to implement the electroreduction of oxygen and carbon dioxide with high performance. The synergistic bifunctional catalyst consists of p-type Co3 O4 core and n-type Co3 S4 shell, which afford high surface electron density along with high capacitance without sacrificing mechanical robustness. A four electron ORR process, identical to the Pt catalyzed ORR, is validated using the core-shell octahedron catalyst. The synergistic interaction between cobalt sulfide and cobalt oxide bicatalyst reduces the activation energy to convert CO2 into adsorbed intermediates and hereby enables CRR to run at a low overpotential, with formate as the highly selective main product at a high faraday efficiency of 85.3%. The remarkable performance can be ascribed to the synergistic coupling effect of the structured co-catalysts; heterojunction structure expedites the electron transfer efficiency and optimizes surface reactant adsorption product desorption processes, which also provide theoretical and pragmatic guideline for catalyst development and mechanism explorations.
ISSN: 1613-6810
DOI: 10.1002/smll.201701724
Rights: © 2017 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
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