Polymer Entrapment Flash Pyrolysis for the Preparation of Nanoscale Iridium‐Free Oxygen Evolution Electrocatalysts,ChemNanoMat

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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

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This paper describes the use of a new polymer entrapment flash pyrolysis (PEFP) method for making nanoscale yttrium ruthenate (Y₂Ru₂O_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 Y₂Ru₂O_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/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 Y₂Ru₂O_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.

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 _-δ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 _-δ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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