Back to Search
Start Over
Scanning Electrochemical Cell Microscopy Investigation of Single ZIF-Derived Nanocomposite Particles as Electrocatalysts for Oxygen Evolution in Alkaline Media
Scanning Electrochemical Cell Microscopy Investigation of Single ZIF-Derived Nanocomposite Particles as Electrocatalysts for Oxygen Evolution in Alkaline Media
- Source :
- Angewandte Chemie (International Ed. in English)
- Publication Year :
- 2019
-
Abstract
- “Single entity” measurements are central for an improved understanding of the function of nanoparticle‐based electrocatalysts without interference arising from mass transfer limitations and local changes of educt concentration or the pH value. We report a scanning electrochemical cell microscopy (SECCM) investigation of zeolitic imidazolate framework (ZIF‐67)‐derived Co−N‐doped C composite particles with respect to the oxygen evolution reaction (OER). Surmounting the surface wetting issues as well as the potential drift through the use of a non‐interfering Os complex as free‐diffusing internal redox potential standard, SECCM could be successfully applied in alkaline media. SECCM mapping reveals activity differences relative to the number of particles in the wetted area of the droplet landing zone. The turnover frequency (TOF) is 0.25 to 1.5 s−1 at potentials between 1.7 and 1.8 V vs. RHE, respectively, based on the number of Co atoms in each particle. Consistent values at locations with varying number of particles demonstrates OER performance devoid of macroscopic film effects.<br />The oxygen evolution reaction (OER) activity of single and multiple ZIF‐derived Co/N−C nanocomposite particles was examined by high‐throughput scanning electrochemical cell microscopy. Through the use of an Os complex as an internal reference standard, the intrinsic activity of the catalyst with respect to the OER activity as well as the turnover frequency could be determined.
- Subjects :
- Nanocomposite
Materials science
010405 organic chemistry
Communication
scanning electrochemical cell microscopy
Oxygen evolution
Chemie
Nanoparticle
General Chemistry
010402 general chemistry
Electrocatalyst
01 natural sciences
Catalysis
Communications
0104 chemical sciences
Electrochemical cell
metal–organic frameworks
Chemical engineering
oxygen evolution reaction
ddc:540
Particle
nanoparticles
Wetting
Electrocatalysis
Zeolitic imidazolate framework
Subjects
Details
- Language :
- English
- Database :
- OpenAIRE
- Journal :
- Angewandte Chemie (International Ed. in English)
- Accession number :
- edsair.doi.dedup.....cc2de465798b5fdcb0925637c6704c97