Tailoring surface states in WO3 photoanodes for efficient photoelectrochemical water splitting
Tailoring surface states in WO3 photoanodes for efficient photoelectrochemical water splitting
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DOI：
10.1016/j.apsusc.2015.04.126
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发表时间：
2015-08-30
影响因子：
6.7
通讯作者：
Mathur, Sanjay
中科院分区：
文献类型：
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作者：
Singh, Trilok;Mueller, Ralf;Mathur, Sanjay
WO3 薄膜的表面态对光生载流子的动力学有显着影响，WO3 薄膜是通过在氧等离子体中对钨基底进行反应溅射而合成的。通过 (i) 氢等离子体处理和 (ii) 锚定等离子体纳米粒子（Au 和 Ag）来定制表面特性，改变了 WO3 光电阳极的光捕获和电荷分离/传输过程。经过氢等离子体处理和贵金属簇涂层后，与原始WO3 (0.2 mA cm(-2)) 相比，WO3 薄膜表现出增强的可见光吸收，因此具有更高的光电流密度(1.4 mA cm(-2))。经氢处理的 WO3 样品的增强被发现是由于 W(VI) 还原成 W(V) 中心，从而产生亚化学计量的 WO3-x 相，而贵金属颗粒有助于入射光的共振和非共振散射，从而提高光子到电流的转换效率。 (C) 2015 Elsevier B.V. 保留所有权利。
The dynamics of photo-induced charge carriers are significantly influenced by the surface states of WO3 thin films, which were synthesized by reactive sputtering of tungsten substrates in oxygen plasma. Tailoring the surface properties by (i) hydrogen plasma treatment and (ii) anchoring plasmonic nanoparticles (Au and Ag) altered the light harvesting and charge separation/transport processes of WO3 photoanodes. Upon hydrogen plasma-treatment and coating of noble metal clusters, WO3 films showed enhanced visible light absorption and consequently higher photocurrent density (1.4 mA cm(-2)) compared to pristine WO3 (0.2 mA cm(-2)). Enhancement in hydrogen treated WO3 sample was found to be due to the reduction of W(VI) into W(V) centers, which produced substoichiometric WO3-x phases, whereas noble metal particles contributed towards both resonant and non-resonant scattering of incident light thereby increasing photon-to-current conversion efficiency. (C) 2015 Elsevier B.V. All rights reserved.