Electrochemically active Ir NPs on graphene for OER in acidic aqueous electrolyte investigated by in situ and ex situ spectroscopies

SURFACE SCIENCE

卷:681

Article

Velasco-Velez, J. J.^1,2  Jones, T. E.²  Streibel, V.²  Haevecker, M.¹  Chuang, C. -H³  Frevel, L.¹  Plodinec, M.^1,4  Centeno, A.⁵  Zurutuza, A.⁵  Wang, R.⁶  Arrigo, R.⁷  Mom, R.¹  Hofmann, S.⁶  Schloegl, R.^1,2  Knop-Gericke, A.² 

[1] Max Planck Inst Chem Energy Convers, Dept Heterogeneous React, D-45470 Mulheim, Germany

[2] Max Planck Gesell, Dept Inorgan Chem, Fritz Haber Inst, D-14195 Berlin, Germany

[3] Tamkang Univ, Dept Phys, New Taipei 25137, Taiwan

[4] Rudjer Boskovic Inst, Bijenicka 54, HR-10000 Zagreb, Croatia

[5] Graphenea, San Sebastian 20018, Spain

[6] Univ Cambridge, Dept Engn, Cambridge CB3 0FA, England

[7] Diamond Light Source Ltd, Harwell Sci & Innovat Campus, Didcot OX11 0DE, Oxon, England

关键词: Photoelectron spectroscopy;    OER;    Ir nanoparticles;    Graphene membrane;    Aqueous electrolyte;   

DOI  :  10.1016/j.susc.2018.10.021

来源: Elsevier

【 摘 要 】

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.

【 授权许可】

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