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This content will become publicly available on October 17, 2018

Title: Microbial Photoelectrosynthesis for Self-Sustaining Hydrogen Generation

Current artificial photosynthesis (APS) systems are promising for the storage of solar energy via transportable and storable fuels, but the anodic half-reaction of water oxidation is an energy intensive process which in many cases poorly couples with the cathodic half-reaction. Here in this paper, we demonstrate a self-sustaining microbial photoelectrosynthesis (MPES) system that pairs microbial electrochemical oxidation with photoelectrochemical water reduction for energy efficient H 2 generation. MPES reduces the overall energy requirements thereby greatly expanding the range of semiconductors that can be utilized in APS. Due to the recovery of chemical energy from waste organics by the mild microbial process and utilization of cost-effective and stable catalyst/electrode materials, our MPES system produced a stable current of 0.4 mA/cm 2 for 24 h without any external bias and ~10 mA/cm 2 with a modest bias under one sun illumination. Finally, this system also showed other merits, such as creating benefits of wastewater treatment and facile preparation and scalability.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [2] ; ORCiD logo [1]
  1. Univ. of Colorado, Boulder, CO (United States). Dept. of Civil, Environmental, and Architectural Engineering
  2. San Diego State Univ., San Diego, CA (United States). Dept. of Chemistry and Biochemistry
  3. National Renewable Energy Lab. (NREL), Golden, CO (United States). Chemistry and Nanoscience Center
  4. National Renewable Energy Lab. (NREL), Golden, CO (United States). Chemistry and Nanoscience Center; National Renewable Energy Lab. (NREL), Golden, CO (United States). Biosciences Center
Publication Date:
Report Number(s):
NREL/JA-5900-70538
Journal ID: ISSN 0013-936X
Grant/Contract Number:
AC36-08GO28308
Type:
Accepted Manuscript
Journal Name:
Environmental Science and Technology
Additional Journal Information:
Journal Volume: 51; Journal Issue: 22; Journal ID: ISSN 0013-936X
Publisher:
American Chemical Society (ACS)
Research Org:
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Sponsoring Org:
USDOE Office of Energy Efficiency and Renewable Energy (EERE); National Science Foundation (NSF)
Country of Publication:
United States
Language:
English
Subject:
08 HYDROGEN; PHOTOSYNTHESIS; ENERGY STORAGE; SOLAR ENERGY; HYDROGEN GENERATION
OSTI Identifier:
1409491