Phase‐Modulated Band Alignment in CdS Nanorod/SnSx Nanosheet Hierarchical Heterojunctions toward Efficient Water Splitting,Advanced Functional Materials

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Phase‐Modulated Band Alignment in CdS Nanorod/SnSx Nanosheet Hierarchical Heterojunctions toward Efficient Water Splitting
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2018-02-19 , DOI: 10.1002/adfm.201706785
Yanming Fu _{1,

2} , Fengren Cao ₁ , Fangli Wu ₁ , Zhidan Diao ₂ , Jie Chen ₂ , Shaohua Shen ₂ , Liang Li ₁

Affiliation

CdS is a promising visible light response photoanode of photoelectrochemical (PEC) water splitting, but it remains a great challenge for practical application, due to the photohole‐induced self‐corrosion, and sulfide/sulfite ions as hole scavengers are always necessary for stable solar hydrogen generation. Herein, a CdS/SnS_x nanorods/nanosheets hierarchical heterostructure with novel phase‐engineered band alignment is rationally designed via a two‐step solution reaction route for PEC water splitting. In the Na₂SO₄ aqueous electrolyte without any hole scavengers, compared with the pristine CdS, the CdS/SnS_x photoanode achieves a remarkably enhanced photocurrent density of 1.59 mA cm⁻² and a considerable stability at bias potential 1.23 V versus reversible hydrogen electrode (RHE) under simulated sunlight. It is proposed that the deposited SnS_x nanosheets not only act as protective layers to restrain the photocorrosion of CdS, but also facilitate the charge separation in CdS by the virtue of the Type II heterojunction formed between CdS and SnS_x.

中文翻译：

CdS Nanorod / SnSx纳米片层状异质结中的相位调制能带对准，可实现高效水分解

CdS是光化学（PEC）水分解的有希望的可见光响应光阳极，但由于光孔引起的自腐蚀以及作为空穴清除剂的硫化物/亚硫酸根离子对于稳定的太阳能始终是必需的，因此它在实际应用中仍然是一个巨大的挑战氢生成。本文通过两步溶液反应路线对PEC的水分解进行了合理设计，设计了具有新颖的相工程能带排列的CdS / SnS _x纳米棒/纳米片分层异质结构。在没有任何空穴清除剂的Na ₂ SO ₄水溶液中，与原始CdS相比，CdS / SnS _x光电阳极的光电流密度显着提高，为1.59 mA cm ^-2相对于可逆氢电极（RHE）在模拟阳光下，在1.23 V偏压下具有相当高的稳定性。提出沉积的SnS _x纳米片不仅充当保护层以抑制CdS的光腐蚀，而且由于在CdS和SnS _x之间形成的II型异质结而促进了CdS中的电荷分离。

更新日期：2018-02-19

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