Inayat Ali Khan, Per Morgen, Raghunandan Sharma* and Shuang Ma Andersen*,
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引用次数: 0
Abstract
In the present study, we used a simple and efficient microwave-assisted NaBH4 reduction method to generate unsupported and antimony-doped tin oxide (ATO)-supported metallic iridium nanoparticles (Ir-NPs). The effects of pretreatment on the support and iridium precursor oxidation state in two different salts (IrCl3·nH2O and (NH4)2IrCl6) were investigated to produce efficient and stable electrocatalysts for oxygen evolution reaction (OER) in acidic electrolysis. Electrocatalysts with an Ir loading of 40 wt % supported on pristine ATO and acid-treated ATO were synthesized, and the performance was compared with the unsupported, synthesized, and commercial electrocatalysts. The Ir-NPs loaded on the support surface with 98% reaction yield and narrow size distribution, while without the support, somewhat agglomerated Ir-NPs were generated. A strong metal–support electron interaction at the junction of the Ir support, promoting the electrocatalyst stability and activity, was achieved for the supported electrocatalysts obtained from both precursors. The best electrocatalyst has demonstrated an excellent OER activity of 597 A gIr–1 compared to that of 305 A gIr–1 for a commercial IrO2 benchmark and a high potentiodynamic accelerated stress test stability (OER activity retention: 76% compared to 31% for commercial IrO2). The superior electrochemical performance can be attributed to the prereaction strong adsorption of the iridium precursor on the support surface, resulting in postreaction highly dispersed small NPs over the support surface generating strong metal–support interaction at the junction of Ir-ATO.AT.
在本研究中,我们使用一种简单高效的微波辅助NaBH4还原方法制备了无负载和掺锑氧化锡(ATO)负载的金属铱纳米颗粒(Ir-NPs)。研究了预处理对载体和铱前驱体在不同盐(IrCl3·nH2O和(NH4)2IrCl6)中氧化态的影响,制备了高效稳定的酸性电解析氧反应电催化剂。在原始ATO和酸处理ATO上合成了Ir负载为40%的电催化剂,并将其性能与未负载的、合成的和商用的电催化剂进行了比较。负载在载体表面的Ir-NPs反应产率为98%,粒径分布较窄,而没有载体的Ir-NPs会产生一定程度的团聚。由两种前驱体制备的负载型电催化剂在Ir载体的连接处具有较强的金属-载体电子相互作用,提高了电催化剂的稳定性和活性。在商业IrO2基准测试中,最佳电催化剂的OER活性为597 A gIr-1,而商业IrO2基准测试的OER活性为305 A gIr-1,并且具有较高的电势动力学加速应力测试稳定性(OER活性保持率为76%,而商业IrO2为31%)。优异的电化学性能可归因于反应前载体表面对铱前驱体的强吸附,导致反应后载体表面上高度分散的小NPs在Ir-ATO.AT交界处产生强烈的金属-载体相互作用。
期刊介绍:
ACS Applied Energy Materials is an interdisciplinary journal publishing original research covering all aspects of materials, engineering, chemistry, physics and biology relevant to energy conversion and storage. The journal is devoted to reports of new and original experimental and theoretical research of an applied nature that integrate knowledge in the areas of materials, engineering, physics, bioscience, and chemistry into important energy applications.