Ultrafine Pt Nanoparticles Stabilized by MoS2/N-Doped Reduced Graphene Oxide as a Durable Electrocatalyst for Alcohol Oxidation and Oxygen Reduction Reactions

• DOI: 10.1021/acsami.9b00192
• Publication Date: 2019-03-08T17:28:33Z
• Authors: S. Ramakrishnan; Mohanraju Karuppa...; Mohanraj Vinothka...; K. Ramachandran; Oh Joong Kwon; Dong Jin Yoo
• Keywords: Alcohol Oxidation

Direct alcohol fuel cells play a pivotal role in the synthesis of catalysts because their low cost, high catalytic activity, and long durability half-cell reactions, which include anode (alcohol oxidation) cathode (oxygen reduction) reactions. However, platinum suffer from CO tolerance, affects stability. The present study focuses on ultrafine Pt nanoparticles stabilized by flowerlike MoS2/N-doped reduced graphene oxide (Pt@MoS2/NrGO) architecture, developed via facile cost-competitive approach that was performed through hydrothermal method followed wet-reflux strategy. Fourier transform infrared spectra, X-ray diffraction patterns, Raman photoelectron field-emission scanning electron microscopy, transmission microscopy verified conversion to Pt@MoS2/NrGO. Pt@MoS2/NrGO applied as potential electrocatalyst toward reaction (liquid reduction). In reaction, showed superior activity electro-oxidation methanol, ethylene glycol, glycerol with mass activities 448.0, 158.0, 147.0 mA/mgPt, respectively, approximately 4.14, 2.82, 3.34 times commercial Pt–C (20%) catalyst. catalyst tested 500 cycles, demonstrating less than 20% loss for fuels. oxygen reduction results excellent higher half-wave at 0.895 V versus reversible hydrogen electrode 30 000 cycles only 15 mV potential, whereas Pt@NrGO experienced much greater shift (Pt@NrGO, ∼23 mV; Pt–C, ∼20 mV).