Metal-Reduced WO3–x Electrodes with Tunable Plasmonic Resonance for Enhanced Photoelectrochemical Water Splitting,ACS Applied Energy Materials

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Metal-Reduced WO3–x Electrodes with Tunable Plasmonic Resonance for Enhanced Photoelectrochemical Water Splitting
ACS Applied Energy Materials ( IF 5.4 ) Pub Date : 2020-03-12 00:00:00 , DOI: 10.1021/acsaem.0c00086
Xueliang Zhang _{1,

2,

3} , Xin Wang _{1,

2} , Xinli Yi _{1,

2} , Lequan Liu _{1,

2} , Jinhua Ye _{1,

2,

4} , Defa Wang _{1,

2}

Affiliation

Photoelectrochemical (PEC) water splitting is one of the most promising green technologies for producing renewable clean hydrogen energy. Developing plasmonic semiconductors with tunable plasmonic resonance to visible light has drawn increasing attention in view of utilizing abundant low-energy photons for solar-to-chemical conversion. Herein, we demonstrate for the first time that the WO₃ electrode can be partly reduced by various metal foils in acid solution, showing strong localized surface plasmon resonance (LSPR) in the visible-to-near-infrared (vis–NIR) region. The LSPR can be precisely tuned using metal foils with different standard electrode potentials for different reaction times, and the LSPR peak position strongly depends on the concentration of W⁵⁺ in the WO_3–x electrodes. A photocurrent density of 0.79 mA·cm^–2 at 1.23 V_RHE, which is twice that of pristine one, is obtained over an optimally reduced WO_3–x electrode. The enhanced PEC water splitting performance is ascribed to the increased light absorption, conductivity, and charge-carrier concentration.

中文翻译：

具有可调谐等离子体共振的金属还原WO ₃ - _x电极，可增强光电化学水分解

光电化学（PEC）水分解是产生可再生清洁氢能源的最有前途的绿色技术之一。鉴于利用丰富的低能量光子进行太阳到化学转化，开发具有对可见光的可调谐等离子体共振的等离子体半导体引起了越来越多的关注。在这里，我们首次证明了在酸性溶液中，各种金属箔可以部分还原WO ₃电极，在可见到近红外（vis-NIR）区域显示出强的局部表面等离子体共振（LSPR）。可以使用具有不同标准电极电势的金属箔在不同的反应时间精确调节LSPR，并且LSPR峰的位置强烈取决于WO _3–中W ⁵⁺的浓度。_x电极。在最佳还原的WO_3–_x电极上，在1.23 V_RHE处的光电流密度为0.79 mA·cm^–2，是原始光电流密度的两倍。增强的PEC水分解性能归因于增加的光吸收，电导率和电荷载流子浓度。

更新日期：2020-03-12

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