Abstract
The development of low-cost, high-performance, non-precious-metal catalysts for the oxygen reduction reaction (ORR) is highly desirable. In this work, a composite comprising octahedral manganese oxide supported on reduced graphene oxide (Mn3O4/rGO) was synthesized by a one-step hydrothermal process in the presence of a KMnO4 and graphite oxide (GO) suspension. Importantly, the resulting octahedral Mn3O4/rGO composite exhibits excellent electrocatalytic properties in the ORR. The onset potential of the composite is positively shifted by about 160 and 110 mV compared to those of separate Mn3O4 and rGO, respectively. The corresponding electron transfer number for the ORR catalyzed by Mn3O4/rGO is 3.81, which means that the ORR occurs mainly through a four-electron process. Moreover, the composite shows better stability and tolerance of CH3OH and CO poisoning when compared with a commercial Pt/C catalyst. The superior electrocatalytic performance of the octahedral Mn3O4/rGO composite suggests that it could be an efficient and inexpensive noble-metal-free cathodic catalyst for fuel cells.
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This work was financially supported by the National Natural Science Foundation of China (21571034) and the Natural Science Foundation of Fujian Province (2014 J01033).
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Zhang, Y., Zhang, X., Liu, M. et al. One-step synthesis of an octahedral Mn3O4/rGO composite for use as an electrocatalyst in the oxygen reduction reaction. J Solid State Electrochem 22, 2159–2168 (2018). https://doi.org/10.1007/s10008-018-3902-6
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DOI: https://doi.org/10.1007/s10008-018-3902-6