Metal-Reduced WO3-x Electrodes with Tunable Plasmonic Resonance for Enhanced Photoelectrochemical Water Splitting
Metal-Reduced WO3-x Electrodes with Tunable Plasmonic Resonance for Enhanced Photoelectrochemical Water Splitting
复制标题
具有可调谐等离子共振的金属还原 WO3-x 电极，用于增强光电化学水分解
DOI：
10.1021/acsaem.0c00086
复制
发表时间：
--
影响因子：
6.4
通讯作者：
Defa Wang
中科院分区：
文献类型：
--
作者：
Xueliang Zhang;Xin Wang;Xinli Yi;Lequan Liu;Jinhua Ye;Defa Wang
光电化学（PEC）水裂解是最有前途的绿色制氢技术之一。鉴于利用丰富的低能光子进行太阳能到化学转化，开发具有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。在此，我们首次证明了WO 3电极在酸性溶液中可以被各种金属箔部分还原，在可见-近红外（vis-NIR）区域表现出强烈的局域表面等离子体共振（LSPR）。在不同的反应时间下，使用不同标准电极电位的金属箔可以精确地调节LSPR，并且LSPR峰的位置强烈地依赖于WO 3-x电极中W5+的浓度。在最佳还原的WO 3-x电极上，在1.23 VRHE下获得的光电流密度为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。
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 WO3electrode 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 WO3–xelectrodes. A photocurrent density of 0.79 mA·cm–2at 1.23 VRHE, which is twice that of pristine one, is obtained over an optimally reduced WO3–xelectrode. The enhanced PEC water splitting performance is ascribed to the increased light absorption, conductivity, and charge-carrier concentration.