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|Title:||Three-dimensional graphene-supported Ni₃Fe/Co₉S₈ composites : rational design and active for oxygen reversible electrocatalysis||Authors:||Hu, Xuejiao
|Keywords:||Engineering::Chemical engineering||Issue Date:||2019||Source:||Hu, X., Huang, T., Tang, Y., Fu, G. & Lee, J. (2019). Three-dimensional graphene-supported Ni₃Fe/Co₉S₈ composites : rational design and active for oxygen reversible electrocatalysis. ACS Applied Materials and Interfaces, 11(4), 4028-4036. https://dx.doi.org/10.1021/acsami.8b19971||Project:||RG17/16||Journal:||ACS Applied Materials and Interfaces||Abstract:||The development of low-cost and efficient electrocatalysts with a bicomponent active surface for reversible oxygen electrode reactions is highly desirable and challenging. Herein, we develop an effective calcination-hydrothermal approach to fabricate graphene aerogel-anchored Ni₃Fe-Co₉S₈ bifunctional electrocatalyst (Ni₃Fe-Co₉S₈/rGO). The mutually beneficial Ni₃Fe-Co₉S₈ bifunctional active components efficiently balance the performance of oxygen reduction and oxygen evolution reactions (ORR/OER), in which Co9S8 promotes the ORR and Ni₃Fe facilitates the OER. This balance behavior has an obvious advantage over that of monocomponent Ni₃Fe/rGO and Co₉S₈/rGO catalysts. Meanwhile, the additional synergy between porous rGO aerogels and Ni₃Fe-Co₉S₈ endows the composite with more exposed active sites, faster electrons/ions transport rate, and better structural stability. Benefiting from the reasonable material selection and structural design, the Ni₃Fe-Co₉S₈/rGO exhibits not only outstanding ORR activity with the high onset- and half-wave potentials (E onset = 0.91 V and E 1/2 = 0.80 V) but also satisfactory OER activity with a low overpotential at 10 mA cm⁻² (0.39 V). Moreover, rechargeable Zn-air cells equipped with Ni₃Fe-Co₉S₈/rGO exhibit excellent rechargeability and a fast dynamic response.||URI:||https://hdl.handle.net/10356/151249||ISSN:||1944-8244||DOI:||10.1021/acsami.8b19971||Rights:||© 2019 American Chemical Society. All rights reserved.||Fulltext Permission:||none||Fulltext Availability:||No Fulltext|
|Appears in Collections:||SCBE Journal Articles|
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