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

Zekerya DURSUN; Şükriye ULUBAY KARABİBEROĞLU; Buket GELMEZ

Article Details

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

Authors:

Zekerya DURSUN | Şükriye ULUBAY KARABİBEROĞLU | Buket GELMEZ

Publisher:

TUBITAK

Journal:

Turkish Journal of Chemistry 2011 Vol.35 Issue 4, pp.513-521

Document Type:

Article

Publication Date:

3/2011

Document Language:

Turkish

Document ID (Org No.):

2000727779

Frequency:

Bimonthly

eISSN:

1303-6130

pISSN:

1300-0527

Abstract:

 

Electrocatalytic reduction of oxygen at electrochemically  deposited Pt ad-layer modified Au(111) electrodes was studied in an  O2-saturated NaOH (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  Au(111).  Linear sweep voltammetry displayed a positive shift of the  oxygen reduction potential by about 0.14 V compared to the bare  Au(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 Au(111) electrode.

 

Electrocatalytic reduction of oxygen at electrochemically  deposited Pt ad-layer modified Au(111) electrodes was studied in an  O2-saturated NaOH (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  Au(111).  Linear sweep voltammetry displayed a positive shift of the  oxygen reduction potential by about 0.14 V compared to the bare  Au(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 Au(111) electrode.

Article Details

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

Authors: Zekerya DURSUN | Şükriye ULUBAY KARABİBEROĞLU | Buket GELMEZ

Publisher: TUBITAK

Journal: Turkish Journal of Chemistry 2011 Vol.35 Issue 4, pp.513-521

Document Type: Article

Publication Date: 3/2011

Document Language: Turkish

Document ID (Org No.): 2000727779

Frequency: Bimonthly

eISSN: 1303-6130

pISSN: 1300-0527

Issues

Authors:

Zekerya DURSUN | Şükriye ULUBAY KARABİBEROĞLU | Buket GELMEZ

Publisher:

TUBITAK

Journal:

Turkish Journal of Chemistry 2011 Vol.35 Issue 4, pp.513-521

Document Type:

Article

Publication Date:

3/2011

Document Language:

Turkish

Document ID (Org No.):

2000727779

Frequency:

Bimonthly

eISSN:

1303-6130

pISSN:

1300-0527