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Polymer Entrapment Flash Pyrolysis for the Preparation of Nanoscale Iridium‐Free Oxygen Evolution Electrocatalysts
Author(s) -
Shih PeiChieh,
Zhang Cheng,
Raheja Harshit,
Sun ChengJun,
Yang Hong
Publication year - 2020
Publication title -
chemnanomat
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.947
H-Index - 32
ISSN - 2199-692X
DOI - 10.1002/cnma.202000124
Subject(s) - overpotential , materials science , nanocrystalline material , catalysis , chemical engineering , electrocatalyst , x ray absorption spectroscopy , oxygen evolution , oxide , inorganic chemistry , nanotechnology , electrochemistry , absorption spectroscopy , chemistry , metallurgy , organic chemistry , electrode , physics , quantum mechanics , engineering
This paper describes the use of a new polymer entrapment flash pyrolysis (PEFP) method for making nanoscale yttrium ruthenate (Y 2 Ru 2 O 7‐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 Y 2 Ru 2 O 7‐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/cm 2 geo in chronopotentiometry testing. This is equivalent to an overpotential value of 270 mV, about half of that of the reference IrO 2 catalyst. X‐ray absorption spectroscopy (XAS) and transmission electron microscopy (TEM) analysis showed that the high‐surface‐area Y 2 Ru 2 O 7‐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.