Electrocatalytic reactivity of Pt ad-layer modified Au(111) single crystal electrodes on reduction of oxygen

Authors : Zekerya DURSUN, Şükriye ULUBAY KARABİBEROĞLU, Buket GELMEZ

Pages : 513-521

Doi:10.3906/vet-1201-26

View : 27 | Download : 9

Publication Date : 0000-00-00

Article Type : Research Paper

Abstract :Electrocatalytic reduction of oxygen at electrochemically deposited Pt ad-layer modified Auinsert ignore into journalissuearticles values(111); electrodes was studied in an O2-saturated NaOH insert ignore into journalissuearticles values(0.1 M); solution. The results were compared with those obtained by using a polycrystalline Pt electrode and another Pt-deposited electrode prepared by replacement with Cu on bare Auinsert ignore into journalissuearticles values(111);. Linear sweep voltammetry displayed a positive shift of the oxygen reduction potential by about 0.14 V compared to the bare Auinsert ignore into journalissuearticles values(111); electrode. This shift was about 0.06 V compared to a Pt disk electrode. Tafel slopes gradually changed between 0.06 and 0.1 V/dec, from 0.075 to -0.10 V/dec, from lower to higher current density region. The Pt ad-layer clearly served as a catalyst for oxygen reduction via 4-electron transfer. In terms of the desired shift in reduction potential and increased current density, the best electrocatalytic activity was obtained with a 30-s electrodeposited Pt ad-layer modified Auinsert ignore into journalissuearticles values(111); electrode.
Keywords : Oxygen reduction, Pt ad layer, Au 111, single crystal electrode, fuel cell