TY - JOUR
T1 - Investigation of a silicotungstic acid functionalized carbon on pt activity and durability for the oxygen reduction reaction
AU - Mason, K. Sykes
AU - Neyerlin, Kenneth C.
AU - Kuo, Mei Chen
AU - Horning, Kiersten C.
AU - More, Karren L.
AU - Herring, Andrew M.
PY - 2012
Y1 - 2012
N2 - Colloidal Pt prepared by an ethylene glycol reduction method was deposited onto Ketjen black carbon supports functionalized with (0, 3.2, 7.1, and 15.9wt%) 11-silicotungstic acid (Pt/SiW11-C). Electrochemical characterization of the catalysts was performed using rotating disk electrodes (RDE) in 0.1 M HClO 4 electrolyte. XRD and TEM showed smaller crystallite size and more uniform deposition of Pt nanoparticles for Pt/SiW11-C catalysts, respectively. A maximum in the ORR mass activity of 373 mA/mgPt was observed for the 3.2wt% SiW11 catalyst, an 18% improvement over Pt/C. An increase in the electrochemical area (ECA) due to lower Pt particle size and more narrow size distribution is attributed to providing the mass activity enhancement. After 30,000 durability cycles in the potential range 0.6-1.0 V, Pt/SiW11-C showed less Pt particle growth (TEM), and a factor of 1.4 improvement in terms of mass activity retention. After 6,000 durability cycles in the potential range 1.0-1.6 V, Pt/SiW11-C showed a factor of 2 increase in mass activity retention compared to Pt/C. The improvement is attributed to a slower rate of carbon corrosion.
AB - Colloidal Pt prepared by an ethylene glycol reduction method was deposited onto Ketjen black carbon supports functionalized with (0, 3.2, 7.1, and 15.9wt%) 11-silicotungstic acid (Pt/SiW11-C). Electrochemical characterization of the catalysts was performed using rotating disk electrodes (RDE) in 0.1 M HClO 4 electrolyte. XRD and TEM showed smaller crystallite size and more uniform deposition of Pt nanoparticles for Pt/SiW11-C catalysts, respectively. A maximum in the ORR mass activity of 373 mA/mgPt was observed for the 3.2wt% SiW11 catalyst, an 18% improvement over Pt/C. An increase in the electrochemical area (ECA) due to lower Pt particle size and more narrow size distribution is attributed to providing the mass activity enhancement. After 30,000 durability cycles in the potential range 0.6-1.0 V, Pt/SiW11-C showed less Pt particle growth (TEM), and a factor of 1.4 improvement in terms of mass activity retention. After 6,000 durability cycles in the potential range 1.0-1.6 V, Pt/SiW11-C showed a factor of 2 increase in mass activity retention compared to Pt/C. The improvement is attributed to a slower rate of carbon corrosion.
UR - http://www.scopus.com/inward/record.url?scp=84875495887&partnerID=8YFLogxK
U2 - 10.1149/2.068212jes
DO - 10.1149/2.068212jes
M3 - Article
AN - SCOPUS:84875495887
SN - 0013-4651
VL - 159
SP - F871-F879
JO - Journal of the Electrochemical Society
JF - Journal of the Electrochemical Society
IS - 12
ER -