CdS/Au/Ti/Pb(Mg1/3Nb2/3)0.7Ti0.3O3 photocatalysts and biphotoelectrodes with ferroelectric polarization in single domain for efficient water splitting
- 影响因子：19.503
- DOI码：10.1016/j.apcatb.2018.07.033
- 发表刊物：Appl. Catal. B
- 关键字：Photocatalysis, ferroelectric, polarization, CdS, water splitting, Pb(Mg1/3Nb2/3)0.7Ti0.3O3
- 摘要：The construction of efficient photocatalysts for water splitting is still challenging, mainly due to the unexpected recombination of photogenerated carriers. Ferroelectric polarization-induced charge separation of photocatalysts has been demonstrated as an effective method for improving photocatalytic performance. However, ferroelectric domains in existing works are random before polarization-switching, which results in lower polarization electric field intensity and limits the charge separation efficiency. Here, we report that the spontaneous ferroelectric polarization in a single domain for efficient charge separation over a representative semiconductor CdS, in the form of CdS/Au/Ti/Pb(Mg1/3Nb2/3)0.7Ti0.3O3 (CdS/Au/Ti/PMN-PT), for water splitting in absence of any cocatalyst or external voltage. The photocurrent value of the positive polarized CdS/Au/Ti/PMN-PT yields 1.70 mA·cm−2, which is about 20 times higher than the value of the non-polarized sample. In addition, a biphotoelectrode cell composed of a positively and a negatively polarized CdS/Au/Ti/PMN-PT was constructed. A considerable solar-to-hydrogen conversion efficiency of 0.19% was achieved. It was found that the interfacial resistance and the surface reaction kinetics may be the main factors governing the photocatalytic performance. This work not only provides a strategy to promote charge separation but also develops a new biphotoelectrode cell capable of obtaining efficient solar water splitting.
- 合写作者：Bin Hong,朱晓娣, Fan Zhang. Shikuo Li, Jianjun Ding, Xiaoming Jiang, Chen Gao
- 第一作者：Zhimin Song
- 通讯作者：Jun Bao, Song Sun
- 文献类型：SCI
- 卷号：238
- 页面范围：248-254
- ISSN号：0926-3373
- 是否译文：否
- 发表时间：2018/07/11
- 发布期刊链接：https://www.sciencedirect.com/science/article/pii/S0926337318306416
