TY  - JOUR
AU  - Jacobse, Leon
AU  - Vonk, Vedran
AU  - Mccrum, Ian
AU  - Seitz, Christoph
AU  - Koper, Marc
AU  - Rost, Marcel
AU  - Stierle, Andreas
TI  - Electrochemical oxidation of Pt(111) beyond the place-exchange model
JO  - Electrochimica acta
VL  - 407
SN  - 0013-4686
CY  - New York, NY [u.a.]
PB  - Elsevier
M1  - PUBDB-2022-00712
SP  - 139881
PY  - 2022
AB  - Oxide formation plays an important role in the degradation of Pt electrocatalysts. However, the exact oxide structure and reaction mechanism are not fully understood. Here, we used in situ surface X-ray diffraction experiments to resolve the oxide formation at a Pt(111) model electrode at potentials near the onset of the oxygen evolution reaction. Fast experiments are possible by using X-ray photons with a high kinetic energy in combination with a large 2D detector. By employing very low potential sweep rates we obtain a more ordered oxidized surface compared to literature data from potential step experiments. This demonstrates that the oxidation process is strongly governed by the reaction kinetics. The increased surface order enables us to disentangle two subsequent oxidation process; initially the place-exchange process, followed by the formation of a partially disordered oxide in which still 50
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000794205200013
DO  - DOI:10.1016/j.electacta.2022.139881
UR  - https://bib-pubdb1.desy.de/record/474354
ER  -