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Title: Unbiased solar H 2 production with current density up to 23 mA cm -2 by Swiss-cheese black Si coupled with wastewater bioanode

Abstract

Unbiased photoelectrochemical hydrogen production with high efficiency and durability is highly desired for solar energy storage. Here, we report a microbial photoelectrochemical (MPEC) system that demonstrated superior performance when equipped with bioanodes and black silicon photocathode with a unique “Swiss-cheese” interface. The MPEC utilizes the chemical energy embedded in wastewater organics to boost solar H 2 production, which overcomes barriers on anode H 2O oxidation. Without any bias, the MPEC generates a record photocurrent (up to 23 mA cm -2) and retains prolonged stability for over 90 hours with high Faradaic efficiency (96–99%). The calculated turnover number for MoS x catalyst during a 90 h period is 495 471 with an average frequency of 1.53 s -1. The system replaced pure water on the anode with actual wastewater and achieved waste organic removal up to 16 kg COD m -2 photocathode per day. Cost credits from concurrent wastewater treatment and low-cost design make photoelectrochemical H 2 production practical for the first time.

Authors:
ORCiD logo [1];  [2]; ORCiD logo [3]; ORCiD logo [4]; ORCiD logo [4];  [2]; ORCiD logo [5];  [2]; ORCiD logo [2]; ORCiD logo [1]
  1. Princeton Univ., NJ (United States); Univ. of Colorado, Boulder, CO (United States)
  2. San Diego State Univ., CA (United States)
  3. Idaho National Lab. (INL), Idaho Falls, ID (United States)
  4. National Renewable Energy Lab. (NREL), Golden, CO (United States)
  5. Princeton Univ., NJ (United States)
Publication Date:
Research Org.:
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE)
OSTI Identifier:
1502793
Report Number(s):
NREL/JA-5K00-73372
Journal ID: ISSN 1754-5692; EESNBY
Grant/Contract Number:  
AC36-08GO28308
Resource Type:
Accepted Manuscript
Journal Name:
Energy & Environmental Science
Additional Journal Information:
Journal Volume: 12; Journal Issue: 3; Journal ID: ISSN 1754-5692
Publisher:
Royal Society of Chemistry
Country of Publication:
United States
Language:
English
Subject:
08 HYDROGEN; 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; hydrogen production; bioanodes; photoelectrochemistry; black silicon

Citation Formats

Lu, Lu, Vakki, Waltteri, Aguiar, Jeffery A., Xiao, Chuanxiao, Hurst, Katherine, Fairchild, Michael, Chen, Xi, Yang, Fan, Gu, Jing, and Ren, Zhiyong Jason. Unbiased solar H2 production with current density up to 23 mA cm-2 by Swiss-cheese black Si coupled with wastewater bioanode. United States: N. p., 2019. Web. doi:10.1039/C8EE03673J.
Lu, Lu, Vakki, Waltteri, Aguiar, Jeffery A., Xiao, Chuanxiao, Hurst, Katherine, Fairchild, Michael, Chen, Xi, Yang, Fan, Gu, Jing, & Ren, Zhiyong Jason. Unbiased solar H2 production with current density up to 23 mA cm-2 by Swiss-cheese black Si coupled with wastewater bioanode. United States. doi:10.1039/C8EE03673J.
Lu, Lu, Vakki, Waltteri, Aguiar, Jeffery A., Xiao, Chuanxiao, Hurst, Katherine, Fairchild, Michael, Chen, Xi, Yang, Fan, Gu, Jing, and Ren, Zhiyong Jason. Tue . "Unbiased solar H2 production with current density up to 23 mA cm-2 by Swiss-cheese black Si coupled with wastewater bioanode". United States. doi:10.1039/C8EE03673J.
@article{osti_1502793,
title = {Unbiased solar H2 production with current density up to 23 mA cm-2 by Swiss-cheese black Si coupled with wastewater bioanode},
author = {Lu, Lu and Vakki, Waltteri and Aguiar, Jeffery A. and Xiao, Chuanxiao and Hurst, Katherine and Fairchild, Michael and Chen, Xi and Yang, Fan and Gu, Jing and Ren, Zhiyong Jason},
abstractNote = {Unbiased photoelectrochemical hydrogen production with high efficiency and durability is highly desired for solar energy storage. Here, we report a microbial photoelectrochemical (MPEC) system that demonstrated superior performance when equipped with bioanodes and black silicon photocathode with a unique “Swiss-cheese” interface. The MPEC utilizes the chemical energy embedded in wastewater organics to boost solar H2 production, which overcomes barriers on anode H2O oxidation. Without any bias, the MPEC generates a record photocurrent (up to 23 mA cm-2) and retains prolonged stability for over 90 hours with high Faradaic efficiency (96–99%). The calculated turnover number for MoSx catalyst during a 90 h period is 495 471 with an average frequency of 1.53 s-1. The system replaced pure water on the anode with actual wastewater and achieved waste organic removal up to 16 kg COD m-2 photocathode per day. Cost credits from concurrent wastewater treatment and low-cost design make photoelectrochemical H2 production practical for the first time.},
doi = {10.1039/C8EE03673J},
journal = {Energy & Environmental Science},
number = 3,
volume = 12,
place = {United States},
year = {2019},
month = {2}
}

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Works referenced in this record:

Solar Water Splitting Cells
journal, November 2010

  • Walter, Michael G.; Warren, Emily L.; McKone, James R.
  • Chemical Reviews, Vol. 110, Issue 11, p. 6446-6473
  • DOI: 10.1021/cr1002326