Oxygen Evolution at IrO2 Shell–Ir−Ni Core Electrodes Prepared by Galvanic Replacement,The Journal of Physical Chemistry C

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Oxygen Evolution at IrO2 Shell–Ir−Ni Core Electrodes Prepared by Galvanic Replacement
The Journal of Physical Chemistry C ( IF 3.3 ) Pub Date : 2016-09-01 00:00:00 , DOI: 10.1021/acs.jpcc.6b06025
A. Papaderakis ₁ , N. Pliatsikas , Ch. Prochaska , G. Vourlias , P. Patsalas , D. Tsiplakides ₁ , S. Balomenou ₁ , S. Sotiropoulos

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IrO₂ shell–Ir−Ni core particulate films (denoted as IrO₂ (Ir−Ni)) have been prepared by galvanic replacement of Ni layers electrodeposited on glassy carbon (GC) electrodes. The method involves three steps: immersion of the Ni/GC electrode into a deaerated solution of Ir(IV) at 65 °C for 15 min (galvanic replacement); electrochemical treatment of the resulting Ir−Ni/GC electrode for anodic dissolution of nonreacted surface Ni and surface enrichment in Ir (formation of a precursor core–shell structure denoted as Ir (Ir−Ni)); anodization of the resulting Ir (Ir−Ni)/GC system (iridium dioxide formation). The resulting IrO₂ (Ir−Ni)/GC electrodes have been characterized by SEM/EDS, AFM, and XPS, revealing a particulate morphology (submicron particles), an Ir-rich bulk atomic composition (Ir/Ni atomic ratio of ca. 5), and a thin IrO₂ shell. Electrochemical characterization in acid solutions in both the H adsorption/desorption and the oxide formation/reduction potential ranges points to complete surface coverage by IrO₂. The prepared IrO₂ (Ir−Ni)/GC electrodes have been tested as anodes for oxygen evolution (OER) from acid solutions by means of EIS and steady-state current–potential plots; they have been proven to exhibit superior intrinsic catalytic activity for OER compared to that of plain IrO₂ anodically grown on bulk Ir.

中文翻译：

电置换制备的IrO ₂壳-Ir-Ni核电极上的氧逸出

IrO ₂壳层-Ir-Ni核心颗粒膜（称为IrO ₂（Ir-Ni））是通过电沉积沉积在玻璃碳（GC）电极上的Ni层的电置换制备的。该方法包括三个步骤：将Ni / GC电极在65°C下浸入Ir（IV）的脱气溶液中15分钟（电流置换）；电化学处理所得的Ir-Ni / GC电极，用于未反应表面Ni的阳极溶解和Ir中的表面富集（表示为Ir（Ir-Ni）的前体核-壳结构的形成）；生成的Ir（Ir-Ni）/ GC系统的阳极氧化（二氧化铱的形成）。生成的IrO ₂（Ir-Ni）/ GC电极已通过SEM / EDS，AFM和XPS进行了表征，显示出颗粒形态（亚微米颗粒），富含Ir的本体原子组成（Ir / Ni原子比约为5）和薄的IrO ₂外壳。在H吸附/解吸和氧化物形成/还原电势范围内的酸性溶液中，电化学特性都表明IrO ₂可以完全覆盖表面。制备的IrO ₂（Ir-Ni）/ GC电极已经通过EIS和稳态电流-势图测试了作为从酸溶液中析出氧（OER）的阳极。与阳极氧化在大量Ir上生长的普通IrO ₂相比，已证明它们对OER表现出优异的内在催化活性。

更新日期：2016-09-01

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