Spinel structural disorder influences solar-water-splitting performance of ZnFe2O4 nanorod photoanodes
- 影响因子：30.849
- DOI码：10.1002/adma.201801612
- 发表刊物：Adv. Mater.
- 关键字：Cation inversion degree, charge transport, crystallinity, nanostructured photoelectrodes, ternary metal oxide semiconductors
- 摘要：Abstract Zinc spinel ferrite, ZnFe2O4 (ZFO), is an emerging photoanode material for photoelectrochemical (PEC) solar fuel production. However, a lack of fundamental insight into the factors limiting the photocurrent has prevented substantial advance in its performance. Herein, it is found that ZFO nanorod array photoelectrodes with varying crystallinity exhibit vastly different PEC properties. Using a sacrificial hole scavenger (H2O2), spatially defined carrier generation, and electrochemical impedance spectroscopy, it is shown that ZFO with a relatively poor crystallinity but a higher spinel inversion degree (due to cation disorder) exhibits superior photogenerated charge separation efficiency and improved majority charge carrier transport compared to ZFO with higher crystallinity and a lower inversion degree. Conversely, the latter condition leads to better charge injection efficiency. Optimization of these factors, and the addition of a nickel?iron oxide cocatalyst overlayer, leads to a new benchmark solar photocurrent for ZFO of 1.0 mA cm?2 at 1.23 V versus reversible hydrogen electrode (RHE) and 1.7 mA cm?2 at 1.6 V versus RHE. Importantly, the observed correlation between the cation disorder and the PEC performance represents a new insight into the factors important to the PEC performance of the spinel ferrites and suggests a path to further improvement.
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- 合写作者：Yongpeng Liu, Pascal Schouwink, Rebekah A. Wells, Florian Le Formal, Song Sun, Chen Gao
- 第一作者：朱晓娣
- 通讯作者：Néstor Guijarro, Kevin Sivula
- 论文编号：1802359
- 卷号：30
- 期号：34
- 页面范围：1801612
- ISSN号：0935-9648
- 是否译文：否
- 发表时间：2018/07/05
- 发布期刊链接：https://onlinelibrary.wiley.com/doi/full/10.1002/adma.201801612
