期刊
ENERGY & ENVIRONMENTAL SCIENCE
卷 6, 期 2, 页码 634-642出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c2ee23620f
关键词
-
资金
- National Science Foundation [CHE-1150378]
- Division Of Chemistry
- Direct For Mathematical & Physical Scien [1150378] Funding Source: National Science Foundation
Uniform thin films of hematite and Ti-doped hematite (alpha-Fe2O3) were deposited on transparent conductive substrates using atomic layer deposition (ALD). ALD's epitaxial growth mechanism allowed the control of the morphology and thickness of the hematite films as well as the concentration and distribution of Ti atoms. The photoelectrochemical performances of Ti-doped and undoped hematite electrodes were examined and compared under water oxidation conditions. The incorporation of Ti atoms into hematite electrodes was found to dramatically enhance the water oxidation performance, with much greater enhancement found for the thinnest films. An optimum concentration similar to 3 atomic% of Ti atoms was also determined. A series of electrochemical, photoelectrochemical and impedance spectroscopy measurements were employed to elucidate the cause of the improved photoactivity of the Ti-doped hematite thin films. This performance enhancement was a combination of improved bulk properties (hole collection length) and surface properties (water oxidation efficiency). The improvement in both bulk and surface properties is attributed to the resurrection of a dead layer by the Ti dopant atoms.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据