TY - JOUR
T1 - Hydrogen oxidation and evolution reaction kinetics on carbon supported Pt, Ir, Rh, and Pd electrocatalysts in acidic media
AU - Durst, Julien
AU - Simon, Christoph
AU - Hasche, Frédéric
AU - Gasteiger, Hubert A.
N1 - Publisher Copyright:
© The Author(s) 2014.
PY - 2015
Y1 - 2015
N2 - The hydrogen oxidation and evolution reaction (HOR/HER) behavior of carbon supported metal (Pt, Ir, Rh, Pd) nanoparticle electrocatalysts is studied using the H2 pump approach, in a proton exchange membrane fuel cell (PEMFC) setup. After describing the best method for normalizing the net faradaic currents to the active surface area of the electrodes, we measure the HOR/HER kinetic parameters (exchange current densities and transfer coefficients) in a temperature range from 313 K to 353 K and calculate the activation energy for the HOR/HER process. We compare the measured kinetic parameters with those extracted from different mass-transport limitation free setups in literature, to evaluate the hydrogen electrocatalysis on these most active surfaces. The HOR/HER activity scales with the following: Pt > Ir 蠑 Rh > Pd. The anodic and cathodic transfer coefficients are similar for all metals (ca. 0.5), leading to Tafel slopes of ca. 140 mV/decade at 353 K (except for the anodic branch of Pd and the cathodic branch of Rh). The lowest activation energies are found for Pt and Ir (≈20 kJ/mol). For Rh and Pd, higher activation energies are found (≈30 kJ/mol), and attributed to the formation of surface oxides and hydride phase, respectively.
AB - The hydrogen oxidation and evolution reaction (HOR/HER) behavior of carbon supported metal (Pt, Ir, Rh, Pd) nanoparticle electrocatalysts is studied using the H2 pump approach, in a proton exchange membrane fuel cell (PEMFC) setup. After describing the best method for normalizing the net faradaic currents to the active surface area of the electrodes, we measure the HOR/HER kinetic parameters (exchange current densities and transfer coefficients) in a temperature range from 313 K to 353 K and calculate the activation energy for the HOR/HER process. We compare the measured kinetic parameters with those extracted from different mass-transport limitation free setups in literature, to evaluate the hydrogen electrocatalysis on these most active surfaces. The HOR/HER activity scales with the following: Pt > Ir 蠑 Rh > Pd. The anodic and cathodic transfer coefficients are similar for all metals (ca. 0.5), leading to Tafel slopes of ca. 140 mV/decade at 353 K (except for the anodic branch of Pd and the cathodic branch of Rh). The lowest activation energies are found for Pt and Ir (≈20 kJ/mol). For Rh and Pd, higher activation energies are found (≈30 kJ/mol), and attributed to the formation of surface oxides and hydride phase, respectively.
UR - http://www.scopus.com/inward/record.url?scp=84922371572&partnerID=8YFLogxK
U2 - 10.1149/2.0981501jes
DO - 10.1149/2.0981501jes
M3 - Article
AN - SCOPUS:84922371572
SN - 0013-4651
VL - 162
SP - F190-F203
JO - Journal of the Electrochemical Society
JF - Journal of the Electrochemical Society
IS - 1
ER -