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| 001 | 474354 | ||
| 005 | 20250715175447.0 | ||
| 024 | 7 | _ | |a 10.1016/j.electacta.2022.139881 |2 doi |
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| 100 | 1 | _ | |a Jacobse, Leon |0 P:(DE-H253)PIP1085323 |b 0 |e Corresponding author |u desy |
| 245 | _ | _ | |a Electrochemical oxidation of Pt(111) beyond the place-exchange model |
| 260 | _ | _ | |a New York, NY [u.a.] |c 2022 |b Elsevier |
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| 520 | _ | _ | |a 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% of the surface atoms reside on sites commensurate to the Pt(111) surface. The reduction experiments indicate that the place-exchange process is structurally reversible, whereas the disordered oxide causes the surface roughening observed during potential cycling. Despite the increased surface order, oxide superstructures are not observed. These results provide important insights in the oxidation and degradation process of Pt(111), which are valuable for the design of improved electrocatalysts and they rationalize operating procedures. |
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| 773 | _ | _ | |a 10.1016/j.electacta.2022.139881 |g Vol. 407, p. 139881 - |0 PERI:(DE-600)1483548-4 |p 139881 |t Electrochimica acta |v 407 |y 2022 |x 0013-4686 |
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