Abstract
This paper describes the use of a new polymer entrapment flash pyrolysis (PEFP) method for making nanoscale yttrium ruthenate (Y2Ru2O7-δ) electrocatalysts. This approach effectively reduced the synthesis temperature of phase-pure pyrochlore catalysts from 1000 °C to 550 °C, and greatly suppressed the sintering of catalyst particles. The supported nanocrystalline Y2Ru2O7-δ catalysts showed enhanced activity towards oxygen evolution reaction (OER) in acidic electrolyte and were stable at 1.50 V for the comparative study (>20 h) under the current density of 10 mA/cm2 geo in chronopotentiometry testing. This is equivalent to an overpotential value of 270 mV, about half of that of the reference IrO2 catalyst. X-ray absorption spectroscopy (XAS) and transmission electron microscopy (TEM) analysis showed that the high-surface-area Y2Ru2O7-δ catalyst had an oxygen-deficient structure. This study provides a route to the synthesis of fine ceramic (or oxide)-based electrocatalysts for making high-performing electrocatalysts.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 930-936 |
| Number of pages | 7 |
| Journal | ChemNanoMat |
| Volume | 6 |
| Issue number | 6 |
| DOIs | |
| State | Published - Jun 1 2020 |
Keywords
- nanocrystalline
- oxygen evolution electrocatalyst
- polymer entrapment
- pyrochlore
- yttrium ruthenate
ASJC Scopus subject areas
- Biomaterials
- Renewable Energy, Sustainability and the Environment
- Energy Engineering and Power Technology
- Materials Chemistry