Multifunctional Coatings from Scalable Single Source Precursor Chemistry in Tandem Photoelectrochemical Water Splitting

Yi Hsuan Lai, David W. Palm, Erwin Reisner

研究成果: Article

38 引文 (Scopus)

摘要

The straightforward and inexpensive fabrication of stabilized and activated photoelectrodes for application to tandem photoelectrochemical (PEC) water splitting is reported. Semiconductors such as Si, WO3, and BiVO4 can be coated with a composite layer formed upon hydrolytic decomposition of heterobimetallic single source precursors (SSPs) based on Ti and Ni, or Ti and Co in a simple single-step process under ambient conditions. The resulting 3d-transition metal oxide composite films are multifunctional, as they protect the semiconductor electrode from corrosion with an amorphous TiO2 coating and act as bifunctional electrocatalysts for H2 and O2 evolution based on catalytic Ni or Co species. Thus, this approach enables the use of the same precursors for both photoelectrodes in tandem PEC water splitting, and SSP chemistry is thereby established as a highly versatile low-cost approach to protect and activate photoelectrodes. In an optimized system, SSP coating of a Si photocathode and a BiVO4 photoanode resulted in a benchmark noble metal-free dual-photoelectrode tandem PEC cell for overall solar water splitting with an applied bias solar-to-hydrogen conversion efficiency of 0.59% and a half-life photostability of 5 h. Scalable multifunctional composite films are prepared from simple single source precursor chemistry using solely inexpensive materials and techniques. The films provide protection and the integration of bifunctional water splitting catalysts onto photoelectrodes, thus enabling the assembly of a low-cost photoelectrochemical tandem device with a benchmark performance.

原文English
文章編號1501668
期刊Advanced Energy Materials
5
發行號24
DOIs
出版狀態Published - 2015 十二月 23

指紋

Coatings
Water
Composite films
Semiconductor materials
Photoelectrochemical cells
Photocathodes
Electrocatalysts
Precious metals
Conversion efficiency
Oxide films
Transition metals
Costs
Hydrogen
Corrosion
Decomposition
Fabrication
Electrodes
Catalysts
Composite materials
bismuth vanadium tetraoxide

All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)

引用此文

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