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Title: In situ investigation on ultrafast oxygen evolution reactions of water splitting in proton exchange membrane electrolyzer cells

Abstract

We present that the oxygen evolution reaction (OER) is a half reaction in electrochemical devices, including low-temperature water electrolysis, which is considered as one of the most promising methods to generate hydrogen/oxygen for the storage of energy. It is affected by many factors, and its mechanism is still not completely understood. A proton exchange membrane electrolyzer cell (PEMEC) with optical access to the surface of anode catalyst layer (CL) coupled with a distinguished high-speed and micro-scale visualization system (HMVS) was developed to in situ investigate OERs. It was revealed in real time that OERs only occur on the anode CL adjacent to liquid/gas diffusion layer (LGDL). The CL electrical conductivity plays a crucial role in OERs on CLs. The large in-plane electrical resistance of CLs becomes a threshold of OERs over the entire CL, and causes a lot of catalyst waste in the middle of LGDL pores. Moreover, the oxygen bubble nucleation, growth, and detachment and the effect of current density on those processes were also characterized. Here, this study proposes a new approach for better understanding the mechanisms of OERs and optimizing the design and fabrication of membrane electrode assemblies.

Authors:
ORCiD logo [1]; ORCiD logo [1];  [1];  [1];  [2];  [3];  [4];  [5];  [5]; ORCiD logo [6]; ORCiD logo [1]
  1. Univ. of Tennessee, Knoxville, Tullahoma, TN (United States). Department of Mechanical, Aerospace & Biomedical Engineering, UT Space Institute
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Biosciences and Center for Nanophase Materials Science Divisions
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science and Technology Division
  4. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Energy and Transportation Sciences Division
  5. National Renewable Energy Lab. (NREL), Golden, CO (United States). Materials and Chemical Science and Technolog
  6. National Renewable Energy Lab. (NREL), Golden, CO (United States). Mechanical and Thermal Engineering Sciences
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:
1393373
Report Number(s):
NREL/JA-5900-70048
Journal ID: ISSN 2050-7488; JMCAET
Grant/Contract Number:
AC36-08GO28308; FE0011585
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Journal of Materials Chemistry. A
Additional Journal Information:
Journal Volume: 5; Journal Issue: 35; Journal ID: ISSN 2050-7488
Publisher:
Royal Society of Chemistry
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 25 ENERGY STORAGE; electrochemical devices; energy storage

Citation Formats

Mo, Jingke, Kang, Zhenye, Yang, Gaoqiang, Li, Yifan, Retterer, Scott T., Cullen, David A., Toops, Todd J., Bender, Guido, Pivovar, Bryan S., Green Jr, Johney B., and Zhang, Feng-Yuan. In situ investigation on ultrafast oxygen evolution reactions of water splitting in proton exchange membrane electrolyzer cells. United States: N. p., 2017. Web. doi:10.1039/C7TA05681H.
Mo, Jingke, Kang, Zhenye, Yang, Gaoqiang, Li, Yifan, Retterer, Scott T., Cullen, David A., Toops, Todd J., Bender, Guido, Pivovar, Bryan S., Green Jr, Johney B., & Zhang, Feng-Yuan. In situ investigation on ultrafast oxygen evolution reactions of water splitting in proton exchange membrane electrolyzer cells. United States. doi:10.1039/C7TA05681H.
Mo, Jingke, Kang, Zhenye, Yang, Gaoqiang, Li, Yifan, Retterer, Scott T., Cullen, David A., Toops, Todd J., Bender, Guido, Pivovar, Bryan S., Green Jr, Johney B., and Zhang, Feng-Yuan. 2017. "In situ investigation on ultrafast oxygen evolution reactions of water splitting in proton exchange membrane electrolyzer cells". United States. doi:10.1039/C7TA05681H.
@article{osti_1393373,
title = {In situ investigation on ultrafast oxygen evolution reactions of water splitting in proton exchange membrane electrolyzer cells},
author = {Mo, Jingke and Kang, Zhenye and Yang, Gaoqiang and Li, Yifan and Retterer, Scott T. and Cullen, David A. and Toops, Todd J. and Bender, Guido and Pivovar, Bryan S. and Green Jr, Johney B. and Zhang, Feng-Yuan},
abstractNote = {We present that the oxygen evolution reaction (OER) is a half reaction in electrochemical devices, including low-temperature water electrolysis, which is considered as one of the most promising methods to generate hydrogen/oxygen for the storage of energy. It is affected by many factors, and its mechanism is still not completely understood. A proton exchange membrane electrolyzer cell (PEMEC) with optical access to the surface of anode catalyst layer (CL) coupled with a distinguished high-speed and micro-scale visualization system (HMVS) was developed to in situ investigate OERs. It was revealed in real time that OERs only occur on the anode CL adjacent to liquid/gas diffusion layer (LGDL). The CL electrical conductivity plays a crucial role in OERs on CLs. The large in-plane electrical resistance of CLs becomes a threshold of OERs over the entire CL, and causes a lot of catalyst waste in the middle of LGDL pores. Moreover, the oxygen bubble nucleation, growth, and detachment and the effect of current density on those processes were also characterized. Here, this study proposes a new approach for better understanding the mechanisms of OERs and optimizing the design and fabrication of membrane electrode assemblies.},
doi = {10.1039/C7TA05681H},
journal = {Journal of Materials Chemistry. A},
number = 35,
volume = 5,
place = {United States},
year = 2017,
month = 8
}

Journal Article:
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