Atomic-Layer-Deposited TiO 2 -IrO X Nanoscale Thin-Film Electrocatalysts for Water and Chloride Oxidation: Influence of Local Phase Separation
Atomic-Layer-Deposited TiO 2 -IrO X Nanoscale Thin-Film Electrocatalysts for Water and Chloride Oxidation: Influence of Local Phase Separation
复制标题
原子层沉积 TiO 2 -IrO X 纳米薄膜电催化剂用于水和氯化物的氧化：局部相分离的影响
DOI：
10.1021/acsaem.3c00216
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发表时间：
2023
影响因子：
6.4
通讯作者：
Babadi A
中科院分区：
文献类型：
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作者：
Babadi A
采用原子层沉积法（ALD）合成了多种成分的tio2 - irox合金，并将其配置为水和氯离子氧化阳极。研究了合金的平均成分对析氧反应（OER）和析氯反应（CER）活性的影响，并将其与合金的纳米结构和电输运性质进行了关联。结果表明，含38%铱的TiO2-IrOXalloy薄膜的电导率和电化学性能均优于含38%铱的合金薄膜。该成分的OER和CER的活化过电位和Tafel斜率都是最低的，其CER值接近IrOX（不存在tio2成分）。在TiO2-IrOXalloy /n-silicon Schottky光阳极的水氧化实验中，38% Ir组分表现出最大的650 mV光电压。发现（光）电催化剂性能的组分依赖性与观察到的合金相分离到局部富TiO2和富iro2区域的趋势相关。导电原子力显微镜和扫描透射电子显微镜中使用能量色散x射线能谱的化学制图表明，38%的IrOXcomposition比其他合成的IrOXcomposition有更大的相分离。
TiO2–IrOXalloys with a range of compositions synthesized by atomic layer deposition (ALD) were configured as anodes for water and chloride oxidation. The effects of the alloys’ average composition on oxygen evolution reaction (OER) and chloride evolution reaction (CER) activity were investigated and correlated with their nanoscale structures and electrical transport properties. A higher electronic conductivity and superior electrochemical performance were obtained for the TiO2–IrOXalloy films with 38% iridium in comparison with alloy films of either lower or higher IrOXcontent. This composition exhibits the lowest activation overpotentials and Tafel slopes for both the OER and CER of the alloy compositions investigated with values for the CER approaching those of IrOX(no TiO2component present). The 38% Ir composition also exhibits the largest photovoltage, that is, 650 mV, during water oxidation experiments on TiO2–IrOXalloy/n-silicon Schottky photoanodes. The composition dependence of (photo)electrocatalyst properties is found to correlate with observed trends for phase separation of the alloys into locally TiO2- and IrO2-rich regions. Conductive atomic force microscopy and chemical mapping using energy dispersive X-ray spectroscopy in scanning transmission electron microscopy indicate greater phase separation for the 38% IrOXcomposition than for the others synthesized.