Single Particle Nanoelectrochemistry Reveals the Catalytic Oxygen Evolution Reaction Activity of Co3O4 Nanocubes,Angewandte Chemie International Edition

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Single Particle Nanoelectrochemistry Reveals the Catalytic Oxygen Evolution Reaction Activity of Co3O4 Nanocubes
Angewandte Chemie International Edition ( IF 16.1 ) Pub Date : 2021-08-19 , DOI: 10.1002/anie.202109201
Thomas Quast ₁ , Swapnil Varhade ₁ , Sascha Saddeler ₂ , Yen-Ting Chen ₃ , Corina Andronescu ₄ , Stephan Schulz ₂ , Wolfgang Schuhmann ₁

Affiliation

Co₃O₄ nanocubes are evaluated concerning their intrinsic electrocatalytic activity towards the oxygen evolution reaction (OER) by means of single-entity electrochemistry. Scanning electrochemical cell microscopy (SECCM) provides data on the electrocatalytic OER activity from several individual measurement areas covering one Co₃O₄ nanocube of a comparatively high number of individual particles with sufficient statistical reproducibility. Single-particle-on-nanoelectrode measurements of Co₃O₄ nanocubes provide an accelerated stress test at highly alkaline conditions with current densities of up to 5.5 A cm⁻², and allows to derive TOF values of up to 2.8×10⁴ s⁻¹ at 1.92 V vs. RHE for surface Co atoms of a single cubic nanoparticle. Obtaining such high current densities combined with identical-location transmission electron microscopy allows monitoring the formation of an oxy(hydroxide) surface layer during electrocatalysis. Combining two independent single-entity electrochemistry techniques provides the basis for elucidating structure–activity relations of single electrocatalyst nanoparticles with well-defined surface structure.

中文翻译：

单粒子纳米电化学揭示了 Co3O4 纳米立方体的催化析氧反应活性

Co ₃ O ₄纳米立方体通过单实体电化学评估其对析氧反应（OER）的固有电催化活性。扫描电化学电池显微镜 (SECCM) 提供了来自几个单独测量区域的电催化 OER 活性的数据，这些测量区域覆盖了一个 Co ₃ O ₄纳米立方体，具有足够的统计可重复性，并且具有相对大量的单个粒子。Co ₃ O ₄纳米立方体的单粒子纳米电极测量在高碱性条件下提供加速应力测试，电流密度高达 5.5 A cm ^-2，并允许推导出高达 2.8×10 的 TOF 值⁴ s ^-1在 1.92 V vs. RHE 下单个立方纳米粒子的表面 Co 原子。获得如此高的电流密度与相同位置的透射电子显微镜相结合，可以监测电催化过程中氧（氢氧化物）表面层的形成。结合两种独立的单实体电化学技术为阐明具有明确定义的表面结构的单个电催化剂纳米粒子的结构-活性关系提供了基础。

更新日期：2021-10-12

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