Hybrid 0D/2D edamame shaped ZnIn2S4 photoanode modified by Co-Pi and Pt for charge management towards efficient photoelectrochemical water splitting
Hybrid 0D/2D edamame shaped ZnIn2S4 photoanode modified by Co-Pi and Pt for charge management towards efficient photoelectrochemical water splitting
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DOI：
10.1016/j.apcatb.2018.11.031
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发表时间：
2019-05
期刊：
影响因子：
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通讯作者：
Miaoxin Zhou;Zhihua Liu;Qing Song;Xifei Li;BoWen Chen;Zhifeng Liu
中科院分区：
文献类型：
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作者：
Miaoxin Zhou;Zhihua Liu;Qing Song;Xifei Li;BoWen Chen;Zhifeng Liu
电荷的分离和传输以及光的吸收是决定太阳能水分离装置效率的关键。在此，我们首次通过一种简单的水热方法在ITO导电衬底上设计了一种由杂化纳米片(2D)和纳米颗粒(0D)组成的新型EDAMAME形状的ZnIn2S4纳米结构。提出并详细讨论了0D/2D ZnIn2S4的生长机制。一系列PEC测量表明，由于增强了光吸收、有效的电荷分离和转移以及活性中心的增加，0D/2D ZnIn2S4薄膜表现出相对较高的PEC活性(在1.23Vvs.RHE下为0.37 mA/cm2)。此外，在毛豆状锌In2S4光阳极的上下两侧选择性地沉积Co-PI助催化剂和铂纳米粒子后，可以有效地减少表面和界面的电荷复合。空间Co-PI助催化剂驱动空穴流向表面，而铂纳米粒子促进电子向相反方向流动。因此，在没有任何额外掺杂的情况下，集成的Co-PI/ZnIn2S4/Pt器件在1.23V时的光电流密度比RHE提高了0.91 mA/cm2。这项工作强调了毛豆形状的ZnIn2S4可能是一种很有前途的光电化学行为的候选者，而诸如Co-PI和铂在光阳极上的耦合等具有界面电场的方法可以为未来设计高效的PEC器件提供一种新的途径。
Charge separation and transport as well as light absorption are pivotal in determining the efficiency of solar water splitting devices. Herein, we have designed a novel edamame shaped ZnIn2S4nanostructures consisted of hybridized nanoflakes (2D) and nanoparticles (0D) on ITO conductive substrate through a simple hydrothermal method for PEC water splitting for the first time. The growth mechanism of 0D/2D ZnIn2S4is proposed and discussed in detail. The series of PEC measurements indicate that edamame shaped 0D/2D ZnIn2S4films exhibit relatively higher PEC activity (0.37 mA/cm2at 1.23 V vs. RHE) than that of ZnIn2S4NFs and ZnIn2S4NPs due to the enhanced light absorption and efficient charge separation and transfer and increased active sites. Additionally, after selectively depositing Co-Pi cocatalyst and Pt NPs on the top and bottom sides of edamame shaped ZnIn2S4photoanodes, charge recombination at the surface and interface can be efficiently reduced. The spatial Co-Pi cocatalyst drives holes to flow to the surface, while the Pt NPs facilitate the electrons in the opposite directions. Thus, the integrated Co-Pi/ZnIn2S4/Pt equipment without any additional doping presents an increased photocurrent density with 0.91 mA/cm2at 1.23 V vs. RHE. This work highlights that edamame shaped ZnIn2S4can be a promising candidate for photoelectrochemical behavior and rout such as coupling of Co-Pi and Pt co-catalysts on photoanodes have an interfacial electric field can provide a new avenues to design efficient PEC devices in future.