Journal
ACS APPLIED ENERGY MATERIALS
Volume 4, Issue 11, Pages 12671-12676Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsaem.1c02399
Keywords
electrocatalysis; TiO2; polyoxometalate; self-activation; oxygen evolution reaction; core-shell structure
Funding
- Ulm University
- Helmholtz Gemeinschaft (HGF)
- Vector Stiftung
- China Scholarship Council (CSC)
- Alexander-von-Humboldt-Foundation [1186323]
- Deutsche Forschungsgemeinschaft DFG [Cluster of Excellence POLiS] [390874152]
- Deutsche Forschungsgemeinschaft DFG [Collaborative Research Center TRR234 CataLight] [364549901, STR1164/12]
Ask authors/readers for more resources
The study introduces a molecular-in-material integration concept for electrocatalytic oxygen evolution reaction (OER), demonstrating promising performance with a remarkable self-activation mechanism. The composite of polyoxometalate anion on commercial TiO2 nanoparticles shows increased catalytic efficiency and potential for scalable fabrication of electrocatalysts.
The electrocatalytic oxygen evolution reaction (OER) is a key step to access green hydrogen by splitting water into O-2 and H-2. Here, we present a molecule-in-material integration concept based on immobilizing the polyoxometalate (POM) anion ([Co-4(H2O)(2)(PW9O34)(2)](10-)) as a molecular precursor on commercial TiO2 (P25) nanoparticles using the cationic polymer polyethylenimine (PEI) as a linking agent. The resulting composite shows promising electrocatalytic OER performance in 0.1 M aqueous KOH solution over prolonged periods (>10 h), during which a remarkable self-activation is observed, leading to a decreased OER overpotential, increased current density, and high Faradaic efficiency (91 +/- 1%). Mechanistic studies shed light on the underlying reasons for this self-activation and show that the formation of a highly active cobalt oxide and/or hydroxide catalyst and an increase in the electrocatalytically active surface area as well as electrical conductivity are the main contributing factors. The reported approach enables the scalable fabrication of POM-derived composite electrocatalysts, while self-activation could be a viable route to the more robust and more active electrocatalysts for challenging energy-conversion reactions.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available