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Core–Shell [email protected] Nanoparticle Electrocatalysts for Enhanced Oxygen Evolution
Nano Letters ( IF 10.8 ) Pub Date : 2017-09-25 00:00:00 , DOI: 10.1021/acs.nanolett.7b02357
Alaina L. Strickler 1 , Marı́a Escudero-Escribano 1, 2 , Thomas F. Jaramillo 1, 3
Affiliation  

Enhanced catalysis for electrochemical oxygen evolution is essential for the efficacy of many renewable energy technologies, including water electrolyzers and metal–air batteries. Recently, Au supports have been shown to enhance the activity of many 3d transition metal-oxide thin films for the oxygen evolution reaction (OER) in alkaline media. Herein, we translate the beneficial impact of Au supports to high surface area, device-ready core–shell nanoparticles consisting of a Au-core and a metal-oxide shell ([email protected]xOy where M = Ni, Co, Fe, and CoFe). Through a systematic evaluation, we establish trends in performance and illustrate the universal activity enhancement when employing the Au-core in the 3d transition metal-oxide nanoparticles. The highest activity particles, [email protected]x, demonstrate an overpotential of 328 ± 3 mV over a 2 h stability test at 10 mA cm–2, illustrating that strategically coupling Au support and mixed metal-oxide effects in a core–shell nanoparticle morphology is a promising avenue to achieve device-ready, high-performance OER catalysts.

中文翻译:

核-壳[受电子邮件保护]纳米粒子电催化剂,可增强氧气的释放

电化学氧释放的增强催化对于许多可再生能源技术(包括水电解槽和金属空气电池)的功效至关重要。最近,已显示金支持物可增强许多3d过渡金属氧化物薄膜在碱性介质中的氧释放反应(OER)的活性。在本文中,我们将Au载体的有益影响转化为高表面积的设备就绪型核壳纳米颗粒,该颗粒由Au核和金属氧化物壳组成([受电子邮件保护] x O y其中M = Ni,Co,Fe和CoFe)。通过系统的评估,我们建立了性能趋势,并说明了在3d过渡金属氧化物纳米颗粒中使用Au核时通用活性的提高。最高活性的粒子,[受电子邮件保护] x,在10 mA cm –2的2 h稳定性测试中显示出328±3 mV的超电势,说明在核壳纳米粒子中战略性地耦合了Au载体和混合的金属氧化物效应形态学是实现设备就绪的高性能OER催化剂的有前途的途径。
更新日期:2017-09-25
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