Surface and electrochemical characterisation of a Pt-Cu/C nano-structured electrocatalyst, prepared by galvanic displacement
作者： Bart Geboes , Ioanna Mintsouli , Benny Wouters , Jenia Georgieva , Alexandros Kakaroglou
DOI: 10.1016/J.APCATB.2013.12.020
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摘要: Abstract A two-step procedure at room temperature was applied to prepare a bimetallic Pt-Cu carbon-supported catalyst (Pt-Cu/C). First the chemical reduction of Cu ions by sodium borohydride in presence Vulcan XC72R carbon powder is performed. Second, partial galvanic replacement particle layers Pt achieved upon immersion chloroplatinate solution. The characterisation Pt-Cu/C XRD and XPS proves formation alloying. electrochemical active surface area (EASA) determined for transmetalation as well commercial Pt/C from Alfa Aesar HiSpec ® product line. resemblance voltammetry an indication rich shell. catalytic activity towards oxygen reaction both catalysts evaluated using linear sweep (LSV) combination with rotating disc electrode. Koutechý–Levich analysis shows that has higher (ORR) 0.8 V 0.85 V vs RHE compared tested catalyst. increase attributed “ligand effect”-modification core metal on
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