A Tantalum Nitride Photoanode Modified with a Hole-Storage Layer for Highly Stable Solar Water Splitting
A Tantalum Nitride Photoanode Modified with a Hole-Storage Layer for Highly Stable Solar Water Splitting
复制标题
一种用空穴存储层修饰的氮化钽光阳极，用于高度稳定的太阳能水分解
DOI：
10.1002/anie.201404697
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发表时间：
2014-07-01
影响因子：
16.6
通讯作者：
Li, Can
中科院分区：
文献类型：
--
作者：
Liu, Guiji;Shi, Jingying;Li, Can
光电化学（PEC）水分解是一种理想的可再生太阳能燃料生产方法。其中一个主要问题是，窄带隙半导体，如氮化钽，虽然具有理想的带对准水分裂，遭受水氧化的光稳定性差。该研究首次表明，在基准光电流超过5 mAcm（-2）的情况下，水合铁层的存在允许氮化钽光阳极的水氧化持续至少6小时，而裸光阳极在几分钟内迅速降解。显著增强的光稳定性源于水合铁，它起到了空穴储存层的作用。此外，这项工作表明，它可以作为一种保护窄带隙半导体免受太阳能水分解光腐蚀的一般策略。
Photoelectrochemical (PEC) water splitting is an ideal approach for renewable solar fuel production. One of the major problems is that narrow bandgap semiconductors, such as tantalum nitride, though possessing desirable band alignment for water splitting, suffer from poor photostability for water oxidation. For the first time it is shown that the presence of a ferrihydrite layer permits sustainable water oxidation at the tantalum nitride photoanode for at least 6 h with a benchmark photocurrent over 5 mAcm(-2), whereas the bare photoanode rapidly degrades within minutes. The remarkably enhanced photostability stems from the ferrihydrite, which acts as a hole-storage layer. Furthermore, this work demonstrates that it can be a general strategy for protecting narrow bandgap semi-conductors against photocorrosion in solar water splitting.