Journal
NEW JOURNAL OF CHEMISTRY
Volume 44, Issue 25, Pages 10638-10647Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0nj01097a
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Funding
- National Research Foundation of Korea [2020R1A2B5B01002744, 2018R1A2B6006056, 2020R1A2C1012439]
- National Research Foundation of Korea [2018R1A2B6006056] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Optimal morphology tailoring and complete utilization of the nanomaterial components are the effective parameters for improving the electrocatalytic activity of nanomaterials in both the oxygen reduction reaction (ORR) and methanol oxidation reaction (MOR). In the present work, a core-shell reduced graphene oxide (rGO) on tungsten sulfide (WS2),i.e., rGO@WS(2)nanostructure was successfully preparedviamicrowave irradiation, which was found to catalyze the four-electron ORR in a 0.1 M KOH aqueous solution. The rGO@WS(2)nanostructure showed an onset potential of 0.94 V and a 1.68-fold increase in the kinetic current density (-5.9 mA cm(-2)) for the ORR as, compared to the bare WS(2)nanosheets. The superior performance of the rGO@WS(2)nanostructure posits it as one of the efficient noble-metal-free ORR and MOR electrocatalysts. Predominantly, this work demonstrates the importance of an appropriate core-shell rGO@WS(2)nanostructure in achieving high intrinsic activity for the four-electron ORR and MOR with significantly enhanced efficiency.
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