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Stable p‐type Cu:CdS1−xSex/Pt Thin‐Film Photocathodes with Fully Tunable Bandgap for Scavenger‐Free Photoelectrochemical Water Splitting
Solar RRL ( IF 6.0 ) Pub Date : 2020-01-30 , DOI: 10.1002/solr.201900567 Zi Ye 1 , Zhuofeng Hu 2 , Lixia Yang 1 , Xudong Xiao 1
Solar RRL ( IF 6.0 ) Pub Date : 2020-01-30 , DOI: 10.1002/solr.201900567 Zi Ye 1 , Zhuofeng Hu 2 , Lixia Yang 1 , Xudong Xiao 1
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Natural Cd‐based group II–VI semiconductors in photoelectrochemical (PEC) cells are normally used as photoanodes, whose applications are hence hindered by the heavy anodic photocorrosion. Herein, a series of p‐type Cu‐doped CdS1−xSex alloy thin films as photocathodes for water splitting is reported. These alloyed films, synthesized via a simple but well‐controlled physical vapor deposition (PVD) method, are fully tunable in chemical composition, which leads to a tunable bandgap from 1.69 to 2.40 eV. Benefiting from the broadened visible light response, the Cu:CdS0.7Se0.3 photocathode with Pt nanoparticles (NPs) as cocatalysts shows a 37% higher photocurrent density and a higher Faradaic efficiency compared with previously reported Cu:CdS/Pt. More importantly, good stability of the Cu:CdS0.7Se0.3/Pt photocathode in scavenger‐free electrolyte for PEC water splitting is first achieved, with 80% remaining photocurrent and no significant change in 5 h. The released Cd2+ in the electrolyte for the p‐type Cu:CdS1−xSex/Pt photocathode is suppressed by more than three orders of magnitude as compared with a traditional n‐type CdS1−xSex/Pt photoanode. The results reveal the feasibility of Cd‐based group II–VI materials as the thin‐film photocathode for PEC water splitting. The tunable bandgap and durability of p‐type Cu:CdS1−xSex can contribute to future heterojunction structure design in PEC cells.
中文翻译：
具有完全可调带隙的稳定p型Cu：CdS1-xSex / Pt薄膜光电阴极，适用于无清除剂的光电化学水分解
光电化学（PEC）电池中基于天然Cd的II-VI族半导体通常用作光阳极，因此其应用受到严重的阳极光腐蚀的阻碍。本文报道了一系列p型掺杂Cu的CdS 1 - x Se x合金薄膜作为光分解水的阴极。这些合金膜是通过简单但控制良好的物理气相沉积（PVD）方法合成的，其化学成分完全可调，从而导致带隙可调为1.69至2.40 eV。受益于扩大的可见光响应，Cu：CdS 0.7 Se 0.3与先前报道的Cu：CdS / Pt相比，以Pt纳米颗粒（NPs）作为助催化剂的光阴极显示出高37％的光电流密度和更高的法拉第效率。更重要的是，首先实现了Cu：CdS 0.7 Se 0.3 / Pt光电阴极在无清除剂的PEC水分解中的良好稳定性，光电流保留率为80％，5小时内无明显变化。与传统的n型CdS 1 - x Se x相比，p型Cu：CdS 1- x Se x / Pt光电阴极在电解液中释放的Cd 2+被抑制三个数量级以上。/ Pt光电阳极。结果表明，基于Cd的II-VI组材料作为PEC水分解的薄膜光电阴极的可行性。p型Cu：CdS 1- x Se x的可调节带隙和耐用性可有助于未来PEC电池的异质结结构设计。
更新日期：2020-01-30
中文翻译：
具有完全可调带隙的稳定p型Cu：CdS1-xSex / Pt薄膜光电阴极，适用于无清除剂的光电化学水分解
光电化学（PEC）电池中基于天然Cd的II-VI族半导体通常用作光阳极，因此其应用受到严重的阳极光腐蚀的阻碍。本文报道了一系列p型掺杂Cu的CdS 1 - x Se x合金薄膜作为光分解水的阴极。这些合金膜是通过简单但控制良好的物理气相沉积（PVD）方法合成的，其化学成分完全可调，从而导致带隙可调为1.69至2.40 eV。受益于扩大的可见光响应，Cu：CdS 0.7 Se 0.3与先前报道的Cu：CdS / Pt相比，以Pt纳米颗粒（NPs）作为助催化剂的光阴极显示出高37％的光电流密度和更高的法拉第效率。更重要的是，首先实现了Cu：CdS 0.7 Se 0.3 / Pt光电阴极在无清除剂的PEC水分解中的良好稳定性，光电流保留率为80％，5小时内无明显变化。与传统的n型CdS 1 - x Se x相比，p型Cu：CdS 1- x Se x / Pt光电阴极在电解液中释放的Cd 2+被抑制三个数量级以上。/ Pt光电阳极。结果表明，基于Cd的II-VI组材料作为PEC水分解的薄膜光电阴极的可行性。p型Cu：CdS 1- x Se x的可调节带隙和耐用性可有助于未来PEC电池的异质结结构设计。
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