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Title: Microbial Photoelectrosynthesis for Self-Sustaining Hydrogen Generation

Journal Article · · Environmental Science and Technology
 [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

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 H2 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/cm2 for 24 h without any external bias and ~10 mA/cm2 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.

Research Organization:
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE); National Science Foundation (NSF)
Grant/Contract Number:
AC36-08GO28308
OSTI ID:
1409491
Report Number(s):
NREL/JA-5900-70538
Journal Information:
Environmental Science and Technology, Vol. 51, Issue 22; ISSN 0013-936X
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 28 works
Citation information provided by
Web of Science

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Cited By (4)

Wastewater treatment for carbon capture and utilization journal December 2018
Comment on “Unbiased solar H 2 production with current density up to 23 mA cm −2 by Swiss-cheese black Si coupled with wastewater bioanode” by L. Lu, W. Vakki, J. A. Aguiar, C. Xiao, K. Hurst, M. Fairchild, X. Chen, F. Yang, J. Gu and Z. J. Ren, Energy Environ. Sci. , 2019, 12 , 1088 journal January 2019
Anaerobic membrane gas extraction facilitates thermophilic hydrogen production from Clostridium thermocellum journal January 2018
Electrical decoupling of microbial electrochemical reactions enables spontaneous H 2 evolution journal January 2020

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