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Polymer Entrapment Flash Pyrolysis for the Preparation of Nanoscale Iridium‐Free Oxygen Evolution Electrocatalysts
ChemNanoMat ( IF 2.6 ) Pub Date : 2020-04-14 , DOI: 10.1002/cnma.202000124
Pei‐Chieh Shih 1 , Cheng Zhang 1 , Harshit Raheja 1 , Cheng‐Jun Sun 2 , Hong Yang 1
Affiliation  

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/cm2geo 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.

中文翻译:

聚合物包裹快速热解法制备纳米级无铱析氧电催化剂

本文描述了制备纳米级钌钇(Y使用了新的聚合物包封闪热解(PEFP)方法2的Ru 2 ö 7-δ)电催化剂。这种方法有效地将纯相烧绿石催化剂的合成温度从1000°C降低到550°C,并大大抑制了催化剂颗粒的烧结。负载型纳米晶Y 2 Ru 2 O7 催化剂在酸性电解质中显示出对氧释放反应(OER)的增强活性,并且在电流密度为10 mA / cm 2的条件下(> 20 h)稳定在1.50 V进行比较研究地缘在计时电位测试中。这等效于270 mV的过电势值,约为参比IrO 2催化剂的过电势值的一半。X射线吸收光谱(XAS)和透射电子显微镜(TEM)分析表明,高表面积的Y 2 Ru 2 O7 催化剂具有缺氧结构。这项研究提供了合成精细陶瓷(或氧化物)基电催化剂以制备高性能电催化剂的途径。
更新日期:2020-04-14
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