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Composition-Dependent Functionality of Copper Vanadate Photoanodes
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2018-02-28 00:00:00 , DOI: 10.1021/acsami.8b02977 Chang-Ming Jiang , Gideon Segev , Lucas H. Hess , Guiji Liu , Gregory Zaborski , Francesca M. Toma , Jason K. Cooper , Ian D. Sharp 1
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2018-02-28 00:00:00 , DOI: 10.1021/acsami.8b02977 Chang-Ming Jiang , Gideon Segev , Lucas H. Hess , Guiji Liu , Gregory Zaborski , Francesca M. Toma , Jason K. Cooper , Ian D. Sharp 1
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To understand functional roles of constituent elements in ternary metal oxide photoanodes, essential photoelectrochemical (PEC) properties are systematically analyzed on a series of copper vanadate compounds with different Cu:V elemental ratios. Homogeneous and highly continuous thin films of β-Cu2V2O7, γ-Cu3V2O8, Cu11V6O26, and Cu5V2O10 are grown via reactive co-sputtering and their performance characteristics for the light-driven oxygen evolution reaction are evaluated. All four compounds have similar bandgaps in the range of 1.83–2.03 eV, though Cu-rich phases exhibit stronger optical absorption and higher charge separation efficiencies. Transient photocurrent analysis reveals a reduction of surface catalytic activity with increasing Cu:V elemental ratio due to competitive charge recombination at Cu-related surface states. This comprehensive analysis of PEC functionalities—including photon absorption, carrier separation, and heterogeneous charge transfer—informs strategies for improving PEC activity in the copper vanadate materials system and provides insights that may aid discovery, design, and engineering of new photoelectrode materials.
中文翻译：
钒酸铜光阳极的成分依赖性功能
为了了解组成元素在三元金属氧化物光阳极中的功能作用，系统地分析了一系列具有不同Cu：V元素比的钒酸铜化合物的基本光电化学（PEC）特性。均匀和高度连续的薄的薄膜β-Cu系2 V 2 ö 7，γ -铜3 V 2 ø 8，铜11 V 6 ø 26和Cu 5 V 2 ö 10通过反应性共溅射法生长有机硅，并评估它们在光驱氧逸出反应中的性能特征。尽管富铜相表现出更强的光吸收能力和更高的电荷分离效率，但所有四种化合物在1.83–2.03 eV的范围内都具有相似的带隙。瞬态光电流分析表明，由于Cu相关表面态的竞争性电荷复合，随着Cu：V元素比的增加，表面催化活性降低。对PEC功能（包括光子吸收，载流子分离和异质电荷转移）的全面分析，为提高钒酸铜材料系统中PEC活性提供了策略，并提供了有助于发现，设计和设计新光电极材料的见解。
更新日期：2018-02-28
中文翻译：
钒酸铜光阳极的成分依赖性功能
为了了解组成元素在三元金属氧化物光阳极中的功能作用，系统地分析了一系列具有不同Cu：V元素比的钒酸铜化合物的基本光电化学（PEC）特性。均匀和高度连续的薄的薄膜β-Cu系2 V 2 ö 7，γ -铜3 V 2 ø 8，铜11 V 6 ø 26和Cu 5 V 2 ö 10通过反应性共溅射法生长有机硅，并评估它们在光驱氧逸出反应中的性能特征。尽管富铜相表现出更强的光吸收能力和更高的电荷分离效率，但所有四种化合物在1.83–2.03 eV的范围内都具有相似的带隙。瞬态光电流分析表明，由于Cu相关表面态的竞争性电荷复合，随着Cu：V元素比的增加，表面催化活性降低。对PEC功能（包括光子吸收，载流子分离和异质电荷转移）的全面分析，为提高钒酸铜材料系统中PEC活性提供了策略，并提供了有助于发现，设计和设计新光电极材料的见解。
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