TY - JOUR
T1 - Electrochemical characterization of unsupported high area platinum dispersed on the surface of a glassy carbon rotating disk electrode in the absence of Nafion® or other additives
AU - Mo, Yibo
AU - Sarangapani, S.
AU - Le, Anh
AU - Scherson, Daniel Alberto
PY - 2002/12/13
Y1 - 2002/12/13
N2 - A method is described herein to immobilize dispersed unsupported high area Pt particles (ca. 30 m2 g-1) on the surface of a glassy carbon (GC) disk of a rotating Pt(ring)/GC(disk) electrode (RRDE) assembly, without the use of Nafion® or other additives, allowing electrochemical measurements to be performed under forced convection with only minimal losses of Pt from the surface. Diffusion limiting currents, Ilim, and half-wave potentials for O2 reduction recorded with dispersed Pt/GC electrodes at the highest attainable loadings (ca. 8.3 equivalent Pt monolayers and rotation rates 400≤ ω ≤2500 rpm, were found to be differ only slightly from those observed with a bulk Pt RDE of the same cross sectional area, e.g. Ilim(Pt) ca. 1.06Ilim(Pt/GC), under otherwise identical conditions. In addition, this novel strategy enables in situ surface modification of dispersed Pt particles on the GC disk of the RRDE by ad-atoms and subsequent voltammetric and electrocatalytic characterization for a wide spectrum of redox reactions.
AB - A method is described herein to immobilize dispersed unsupported high area Pt particles (ca. 30 m2 g-1) on the surface of a glassy carbon (GC) disk of a rotating Pt(ring)/GC(disk) electrode (RRDE) assembly, without the use of Nafion® or other additives, allowing electrochemical measurements to be performed under forced convection with only minimal losses of Pt from the surface. Diffusion limiting currents, Ilim, and half-wave potentials for O2 reduction recorded with dispersed Pt/GC electrodes at the highest attainable loadings (ca. 8.3 equivalent Pt monolayers and rotation rates 400≤ ω ≤2500 rpm, were found to be differ only slightly from those observed with a bulk Pt RDE of the same cross sectional area, e.g. Ilim(Pt) ca. 1.06Ilim(Pt/GC), under otherwise identical conditions. In addition, this novel strategy enables in situ surface modification of dispersed Pt particles on the GC disk of the RRDE by ad-atoms and subsequent voltammetric and electrocatalytic characterization for a wide spectrum of redox reactions.
KW - Electrocatalysis
KW - Oxygen reduction
KW - Platinum
KW - Rotating disk electrode
KW - Selenium
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U2 - 10.1016/S0022-0728(02)00969-5
DO - 10.1016/S0022-0728(02)00969-5
M3 - Article
AN - SCOPUS:0037073447
VL - 538-539
SP - 35
EP - 38
JO - Journal of Electroanalytical Chemistry
JF - Journal of Electroanalytical Chemistry
SN - 0022-0728
ER -