Iron-Treated NiO as a Highly Transparent p-Type Protection Layer for Efficient Si-Based Photoanodes
详细信息 查看全文
- 作者：Bastian Mei ; Anastasia A. Permyakova ; Rasmus Frydendal ; Dowon Bae ; Thomas Pedersen ; Paolo Malacrida ; Ole Hansen ; Ifan E. L. Stephens ; Peter C. K. Vesborg ; Brian Seger ; Ib Chorkendorff
- 刊名：The Journal of Physical Chemistry Letters
- 出版年：2014
- 出版时间：October 16, 2014
- 年：2014
- 卷：5
- 期：20
- 页码：3456-3461
- 全文大小：384K
- ISSN：1948-7185
文摘
Sputter deposition of 50 nm thick NiO films on p+鈥搉-Si and subsequent treatment in an Fe-containing electrolyte yielded highly transparent photoanodes capable of water oxidation (OER) in alkaline media (1 M KOH) with high efficiency and stability. The Fe treatment of NiO thin films enabled Si-based photoanode assemblies to obtain a current density of 10 mA/cm2 (requirement for >10% efficient devices) at 1.15 V versus RHE (reversible hydrogen electrode) under red-light (38.6 mW/cm2) irradiation. Thus, the photoanodes were harvesting 鈭?0 mV of free energy (voltage), which places them among the best-performing Si-based photoanodes in alkaline media. The stability was proven by chronoamperometry at 1.3 V versus RHE for 300 h. Furthermore, measurements with electrochemical quartz crystal microbalances coupled with ICP-MS showed minor corrosion under dark operation. Extrapolation of the corrosion rate showed stability for more than 2000 days of continuous operation. Therefore, protection by Fe-treated NiO films is a promising strategy to achieve highly efficient and stable photoanodes.