NDLI: Stabilizing inorganic photoelectrodes for efficient solar-to-chemical energy conversion

Content Provider	Royal Society of Chemistry (RSC)
Author	Singh, Nirala Lee, Joun Mubeen, Syed Moskovits, Martin McFarland, Eric W.
Copyright Year	2013
Abstract	An efficient, inexpensive and stable photosynthetic material system that absorbs sunlight and uses the absorbed energy to electrochemically produce chemical and fuel products including hydrogen requires photoelectrode assemblies that are stable in electrolytes. Here we report a photoelectrochemical/photosynthetic cell based on inorganic semiconductor photoelectrodes that shows the long-term operational stability necessary for the production of solar fuels and chemicals. The cell's stability is achieved by forming an active device using an inexpensive spin casted (20 nm) transparent conducting polymer coating (poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS)). PEDOT:PSS protects the photoelectrodes from photoelectrochemical corrosion and functionally serve as either a Schottky contact or as an efficient hole transport layer depending upon the choice and design of the underlying semiconductor heterostructure. Coated semiconductors were assessed both as photoelectrochemical and as freestanding, “autonomous” photosynthetic units and found to be stable for over 12 hours (for wired configuration) in corrosive electrolytes. The solar-to-chemical conversion efficiencies match or exceed devices with more expensive metal-based coatings. Furthermore, the PEDOT:PSS was found to have high electrocatalytic activity, thus no additional electrocatalyst was required. The results suggest a pathway to large scale, inexpensive, hybrid organic–inorganic solar-to-chemical energy conversion systems.
Starting Page	1633
Ending Page	1639
Page Count	7
File Format	HTM / HTML PDF
ISSN	17545692
Volume Number	6
Issue Number	5
Journal	Energy & Environmental Science
DOI	10.1039/c3ee40258d
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	PSS PEDOT Photosynthesis Hydrogen Photoelectrochemical cell Semiconductor The Cell Conductive polymer Poly(3 4-ethylenedioxythiophene) Corrosion Schottky barrier Heterojunction
Content Type	Text
Resource Type	Article
Subject	Environmental Chemistry Pollution Renewable Energy, Sustainability and the Environment Nuclear Energy and Engineering

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