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Increase in Photocurrent Density of WO3 Photoanode by Placing a Layer of an Ordered Array of Mesoporous WO3 Micropillars on Top of a WO3 Sheet Layer
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2022-07-06 , DOI: 10.1021/acsami.2c05107 Sarnai Puntsagdorj 1 , Agni Raj Koirala 1 , Jargalsaikhan Gombovanjil 1 , Nguyen Nguyen Khanh 1 , Sang Do Sung 2 , Wan In Lee 2 , Kyung Byung Yoon 1
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2022-07-06 , DOI: 10.1021/acsami.2c05107 Sarnai Puntsagdorj 1 , Agni Raj Koirala 1 , Jargalsaikhan Gombovanjil 1 , Nguyen Nguyen Khanh 1 , Sang Do Sung 2 , Wan In Lee 2 , Kyung Byung Yoon 1
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A facile stamping method was developed to assemble ordered arrays of mesoporous WO3 micropillars with uniform sizes, shapes, and lengths on F-doped tin oxide glass. Using this method, a series of WO3 heterostructural bilayer photoanodes consisting of an array of m-μm long ordered mesoporous WO3 micropillars at the top and the n-μm thick mesoporous WO3 plain sheet layer at the bottom (denoted as m/n) were prepared. Among them 2.5/7.5 displayed a steady state photocurrent density of 3.6 mA cm–2 at 1.23 V (vs RHE) under AM 1.5 (1 Sun), which is much higher than that of the plain 10-μm thick WO3 sheet (2.5 mA cm–2). This phenomenon occurs owing to the following six benefits: increases in charge carrier density, number of photogenerated electron, charge collection rate, thermodynamic feasibility for the vectorial charge transport from the outermost layer of the photoanode to the inner layer, the surface hydrophilicity, and the decrease in charge transfer resistance.
中文翻译：
通过在 WO3 片层顶部放置一层有序排列的介孔 WO3 微柱来增加 WO3 光电阳极的光电流密度
开发了一种简便的冲压方法，在掺氟氧化锡玻璃上组装有序排列的尺寸、形状和长度均一的介孔 WO 3微柱。使用这种方法，一系列 WO 3异质结构双层光电阳极由顶部的m -μm 长有序介孔 WO 3微柱阵列和底部的n -μm 厚介孔 WO 3平片层组成（表示为m/n ) 准备好了。其中2.5/7.5在AM 1.5（1 Sun）下在1.23 V（vs RHE）下表现出3.6 mA cm –2的稳态光电流密度，远高于普通的10-μm厚WO 3片 (2.5 mA cm –2 )。这种现象的发生归因于以下六个好处：电荷载流子密度的增加，光生电子的数量，电荷收集率，从光阳极最外层到内层的矢量电荷传输的热力学可行性，表面亲水性和电荷转移电阻降低。
更新日期：2022-07-06
中文翻译：
通过在 WO3 片层顶部放置一层有序排列的介孔 WO3 微柱来增加 WO3 光电阳极的光电流密度
开发了一种简便的冲压方法，在掺氟氧化锡玻璃上组装有序排列的尺寸、形状和长度均一的介孔 WO 3微柱。使用这种方法，一系列 WO 3异质结构双层光电阳极由顶部的m -μm 长有序介孔 WO 3微柱阵列和底部的n -μm 厚介孔 WO 3平片层组成（表示为m/n ) 准备好了。其中2.5/7.5在AM 1.5（1 Sun）下在1.23 V（vs RHE）下表现出3.6 mA cm –2的稳态光电流密度，远高于普通的10-μm厚WO 3片 (2.5 mA cm –2 )。这种现象的发生归因于以下六个好处：电荷载流子密度的增加，光生电子的数量，电荷收集率，从光阳极最外层到内层的矢量电荷传输的热力学可行性，表面亲水性和电荷转移电阻降低。
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