期刊
SURFACE SCIENCE
卷 681, 期 -, 页码 1-8出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.susc.2018.10.021
关键词
Photoelectron spectroscopy; OER; Ir nanoparticles; Graphene membrane; Aqueous electrolyte
资金
- BESSY II/HZB [16103418CR]
- Ministry of Education and Science of the Russian Federation [RFMEFI61614X0007]
- Bundesministerium fur Bildung und Forschung through the joint Russian-German research project Synchrotron and NEutron STudies for Energy Storage (SYNESTESia) [05K14EWA]
- DAAD [57218279, 57392335]
- EPSRC [EP/K016636/1, EP/M506485/1]
- [106-2112-M-032-003]
- EPSRC [EP/K016636/1] Funding Source: UKRI
An electrode for the oxygen evolution reaction based on a conductive bi-layered free standing graphene support functionalized with iridium nanoparticles was fabricated and characterized by means of potentiometric and advanced X-ray spectroscopic techniques. It was found that the electrocatalytic activity of iridium nanoparticles is associated to the formation of Ir 5d electron holes. Strong Ir 5d and O 2p hybridization, however, leads to a concomitant increase O 2p hole character, making oxygen electron deficient and susceptible to nucleophilic attack by water. Consequently, more efficient electrocatalysts can be synthesized by increasing the number of electron-holes shared between the metal d and oxygen 2p.
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