Development of a Robust p-Si/p-Cu2O/PhC2Cu Tandem Photocathode for Photoelectrochemical Water Splitting

IF 5.4 3区 材料科学 Q2 CHEMISTRY, PHYSICAL
Bo Pei, Yinmei Li, Shenhui Ma* and Yuyu Bu*, 
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Abstract

The photoelectrochemical (PEC) water splitting performance of Si-based PEC devices is usually restricted by low stability and weak photogenerated carrier transport ability. Herein, a micropyramid array structure (p-SiMPs)/p-Cu2O/PhC2Cu/Pt photocathode device with a p-p-n heterojunction structure is developed. In this tandem PEC device, a p-p heterojunction of p-SiMPs/p-Cu2O is achieved, endowing a higher interface electric field and stronger energy of photoinduced electrons for PEC water reduction. In addition, a stable n-type PhC2Cu protective layer is prepared on the surface of the PEC device by the photoassisted polymerization method, which can improve the stability of PEC water reduction largely. After Pt cocatalytic layer deposition, the p-SiMPs/p-Cu2O/PhC2Cu/Pt tandem photocathode can achieve a saturation photocurrent density of −30 mA/cm2 at −0.9 V (vs RHE) and a photocurrent threshold voltage of −0.1 V for water reduction. This work provides a silicon-based p-p-n heterojunction tandem structure for the PEC water splitting; meanwhile, it indicates that PhC2Cu is a potential material to improve the stability of silicon-based PEC devices.

Abstract Image

用于光电化学水分解的p-Si/p-Cu2O/PhC2Cu串联光电阴极的研制
硅基光电化学(PEC)器件的水分解性能通常受到稳定性低和光生载流子输运能力弱的限制。本文研制了一种具有p-p-n异质结结构的微金字塔阵列(p-SiMPs)/p-Cu2O/PhC2Cu/Pt光电阴极器件。在该串联PEC装置中,实现了p-SiMPs/p-Cu2O的p-p异质结,为PEC水还原提供了更高的界面电场和更强的光致电子能量。此外,采用光辅助聚合的方法在PEC装置表面制备了稳定的n型PhC2Cu保护层,大大提高了PEC减水的稳定性。Pt共催化层沉积后,p-SiMPs/p-Cu2O/PhC2Cu/Pt级联光电阴极在−0.9 V (vs RHE)下的饱和光电流密度为−30 mA/cm2,光电流阈值电压为−0.1 V。本工作提供了一种硅基p-p-n异质结串联结构用于PEC水裂解;同时,表明PhC2Cu是提高硅基PEC器件稳定性的潜在材料。
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来源期刊
ACS Applied Energy Materials
ACS Applied Energy Materials Materials Science-Materials Chemistry
CiteScore
10.30
自引率
6.20%
发文量
1368
期刊介绍: ACS Applied Energy Materials is an interdisciplinary journal publishing original research covering all aspects of materials, engineering, chemistry, physics and biology relevant to energy conversion and storage. The journal is devoted to reports of new and original experimental and theoretical research of an applied nature that integrate knowledge in the areas of materials, engineering, physics, bioscience, and chemistry into important energy applications.
文献相关原料
公司名称
产品信息
麦克林
Triethylamine (C6H15N)
麦克林
Methanol (CH4O)
麦克林
Cuprous chloride (CuCl)
麦克林
Hydrofluoric acid (HF)
阿拉丁
Copper sulfate pentahydrate (CuSO4·H2O)
阿拉丁
Sodium metasilicate (Na2SiO3)
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