General In Situ Photoactivation Route with IPCE over 80% toward CdS Photoanodes for Photoelectrochemical Applications
General In Situ Photoactivation Route with IPCE over 80% toward CdS Photoanodes for Photoelectrochemical Applications
复制标题
一般%20In%20Situ%20Photoactivation%20Route%20with%20IPCE%20over%2080%%20toward%20CdS%20Photoanodes%20for%20光电化学%20应用
DOI：
10.1002/smll.202104307
复制
发表时间：
2021
期刊：
影响因子：
13.3
通讯作者：
Yongbo Kuang
中科院分区：
文献类型：
--
作者：
Ying Wang;Xiuyu Chen;Hao Xiu;Huanglong Zhuang;Jianming Li;Yang Zhou;Deyu Liu;Yongbo Kuang
在实际的光电化学（PEC）水分解中，需要具有优异电子性能的高性价比光阳极。操纵表面载流子分离和重组的能力是实现高PEC水裂解性能的关键。本文报道了一种简单而经济的方法，通过原位光活化大大改善了CdS光阳极的表面电荷分离性能，该方法通过形成硫代硫酸盐离子显著减少了表面电荷的重组，硫代硫酸盐离子有利于光生成孔的转移，并通过将Cd2+与磷酸盐离子溶解在CdS表面形成均匀的纳米孔形态。通过可扩展粒子转移方法得到的CdS电极具有近三倍的光电流，在480 nm处入射光子到电流的转换效率（IPCE）在0.6 V时超过可逆氢电极（RHE）的80%。化学浴沉积制备的CdS薄膜经搅拌和PEC活化后光电流增加了4倍，在455nm和0.6 V处的IPCE为91.7%。通过抑制碱性硼酸盐缓冲液中的光腐蚀，活性光阳极在牺牲亚硫酸盐的情况下表现出很强的太阳能制氢稳定性。这项工作为太阳能水分解纳米多孔金属硫化物半导体的设计带来了见解。
Cost-effective photoanodes with remarkable electronic properties are highly demanded for practical photoelectrochemical (PEC) water splitting. The ability to manipulate the surface carrier separation and recombination is pivotal for achieving high PEC performance for water splitting. Here, a facile and economical approach is reported for substantially improving the surface charge separation property of CdS photoanodes through in situ photoactivation, which significantly reduces surface charge recombination through the formation of thiosulfate ion which is favorable to the transfer of photogenerated holes and a uniform nanoporous morphology via the dissolving Cd2+ with phosphate ions on the surface of CdS. The resulting CdS electrodes through scalable particle transfer method exhibit nearly tripled photocurrents, with an incident-photon-to-current conversion efficiency (IPCE) at 480 nm exceeding 80% at 0.6 V versus reversible hydrogen electrode (RHE). And the CdS thin films prepared from chemical bath deposition display quadrupled photocurrents after the stir and PEC activation, with an IPCE of 91.7% at 455 nm and 0.6 V versus RHE. With the suppression of photocorrosion in alkaline borate buffer, the activated photoanodes show great stability for solar hydrogen production at the sacrifice of sulfite. This work brings insights into the design of nanoporous metal sulfide semiconductors for solar water splitting.