A Pt/MnV2O6 nanocomposite for the borohydride oxidation reaction

• 作者: Jadranka Miliki(c) Marta Martins Ana S.Dobrota Gamze Bozkurt Gulin S.P.Soylu Ay(s)e B.Yurtcan Natalia V.Skorodumova Igor A.Pa?ti Biliana ?liuki(c) Diogo M.F.Santos
• 来源期刊: 能源化学
• 年，卷（期）: 2021,（4）
• 页码范围: 428-436
• 页数: 9页
• 语种: 英文

摘要

Problems associated with carbon support corrosion under operating fuel cell conditions require the iden-tification of alternative supports for platinum-based nanosized electrocatalysts.Platinum supported on manganese vanadate(Pt/MnV2O6)was prepared by microwave irradiation method and characterized using X-ray diffraction,Fourier-transform infrared spectroscopy,X-ray photoelectron spectroscopy,scan-ning electron microscopy with energy dispersive spectroscopy,and transmission electron microscopy.The borohydride oxidation reaction(BOR)on Pt/MnV2O6 was studied in highly alkaline media using voltammetry,chronoamperometry,and electrochemical impedance spectroscopy.BOR electrocatalytic activity of Pt/MnV2O6 was also compared with that of commercial Pt/C(46 wt％Pt)electrocatalyst.The apparent activation energy of BOR at Pt/MnV2O6 was estimated to be 32 kJ mol-1 and the order of reac-tion to be 0.51,indicating that borohydride hydrolysis proceeds in parallel with its oxidation.Long-term stability of Pt/MnV2O6 under BOR typical conditions was observed.A laboratory-scale direct borohydride fuel cell assembled with a Pt/MnV2O6 anode reached a specific power of274 W g-1.Experimental results on Pt/MnV2O6 were complemented by DFT calculations,which indicated good adherence of Pt to MnV2O6,beneficial for electrocatalyst stability.