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Title: Hidden figures of photo-charging: a thermo-electrochemical approach for a solar-rechargeable redox flow cell system

Abstract

Achieving high current densities without thermal performance degradation at high temperatures is one of the main challenges for enhancing the competitiveness of photo-electrochemical energy storage systems. We describe a system that overcomes this challenge by incorporating an integrated photoelectrode with a redox flow cell, which functions as a coolant for the excess heat from the photo-absorber. We perform quantitative analyses to theoretically validate and highlight the merit of the system. Practical operation parameters, including daily temperature and redox reaction kinetics, are modeled with respect to heat and charge transfer mechanisms. Our analyses show a profound impact on the resulting solar-to-chemical efficiencies and stored power, which are 21.8% higher than that of a conventional photovoltaic-assisted energy storage system. This paves the way for reassessing the merit of photovoltaic-integrated systems, which have hitherto been underrated as renewable energy storage systems.

Authors:
ORCiD logo [1];  [1]; ORCiD logo [2]
  1. Delft Univ. of Technology (Netherlands)
  2. Delft Univ. of Technology (Netherlands); National Renewable Energy Lab. (NREL), Golden, CO (United States); Univ. of Colorado, Boulder, CO (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); European Research Council (ERC)
OSTI Identifier:
1677486
Report Number(s):
NREL/JA-5900-78091
Journal ID: ISSN 2398-4902; MainId:32000;UUID:dfceb15e-184b-414d-b7fb-1a1888f3a510;MainAdminID:18691
Grant/Contract Number:  
AC36-08GO28308; 707404
Resource Type:
Accepted Manuscript
Journal Name:
Sustainable Energy & Fuels
Additional Journal Information:
Journal Volume: 4; Journal Issue: 6; Journal ID: ISSN 2398-4902
Publisher:
Royal Society of Chemistry
Country of Publication:
United States
Language:
English
Subject:
25 ENERGY STORAGE; absorption refrigeration; charge transfer; chemical analysis; energy storage; flow batteries; image enhancement; reaction kinetics; redox reactions; solar power generation

Citation Formats

Bae, Dowon, Faasse, Gerrit M., and Smith, Wilson A. Hidden figures of photo-charging: a thermo-electrochemical approach for a solar-rechargeable redox flow cell system. United States: N. p., 2020. Web. doi:10.1039/d0se00348d.
Bae, Dowon, Faasse, Gerrit M., & Smith, Wilson A. Hidden figures of photo-charging: a thermo-electrochemical approach for a solar-rechargeable redox flow cell system. United States. https://doi.org/10.1039/d0se00348d
Bae, Dowon, Faasse, Gerrit M., and Smith, Wilson A. Fri . "Hidden figures of photo-charging: a thermo-electrochemical approach for a solar-rechargeable redox flow cell system". United States. https://doi.org/10.1039/d0se00348d. https://www.osti.gov/servlets/purl/1677486.
@article{osti_1677486,
title = {Hidden figures of photo-charging: a thermo-electrochemical approach for a solar-rechargeable redox flow cell system},
author = {Bae, Dowon and Faasse, Gerrit M. and Smith, Wilson A.},
abstractNote = {Achieving high current densities without thermal performance degradation at high temperatures is one of the main challenges for enhancing the competitiveness of photo-electrochemical energy storage systems. We describe a system that overcomes this challenge by incorporating an integrated photoelectrode with a redox flow cell, which functions as a coolant for the excess heat from the photo-absorber. We perform quantitative analyses to theoretically validate and highlight the merit of the system. Practical operation parameters, including daily temperature and redox reaction kinetics, are modeled with respect to heat and charge transfer mechanisms. Our analyses show a profound impact on the resulting solar-to-chemical efficiencies and stored power, which are 21.8% higher than that of a conventional photovoltaic-assisted energy storage system. This paves the way for reassessing the merit of photovoltaic-integrated systems, which have hitherto been underrated as renewable energy storage systems.},
doi = {10.1039/d0se00348d},
journal = {Sustainable Energy & Fuels},
number = 6,
volume = 4,
place = {United States},
year = {2020},
month = {3}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record

Figures / Tables:

Fig. 1 Fig. 1: (a) Illustration of the PEC-device-integrated redox flow system. This flow system includes electrolyte flow, which is charged by photoelectrodes under illumination. (b) Time-dependent solar spectra in summer (July) and winter (December). (c) Absorber temperature over the course of a summer day (31/07/2018) for the three different heat-transfer scenarios.more » (d) Temperature-dependent J–V characteristics of a c-Si PV modeled for the case of fast kinetics (i.e. no overpotential) using its real temperature-dependent absorption spectrum and the recombination rate calculated based on the absorption spectrum. (e) Temperature-dependent J–V characteristics of a c-Si photoelectrode with highly dominant kinetic overpotential losses. The equation for the temperature-dependant kinetic overpotential used for (e) can be found in the ESI.« less

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Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.