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Title: Meniscus behavior of metals and oxides in molten carbonate under oxidant and reducing atmospheres. 1: Contact angle and electrolyte displacement

Abstract

The wetting of metals and oxides by molten carbonate is an important factor affecting the performance of a molten carbonate fuel cell (MCFC). The distribution of the electrolyte among electrodes and matrix in the MCFC is dominated by the pore characteristics and wetting properties of these components. However, data on wetting, especially under load (current passage), are limited. In this study, the behavior of the meniscus at a metal is used to obtain information on wetting and electrochemical reactions. Meniscus height and current were measured under various atmospheres. The contact angle was calculated from the meniscus height. The electrolyte distribution in the MCFC was estimated using contact angles thus obtained in oxidant and reducing atmospheres. The results suggest that upon application of load the electrolyte moves from the anode to the cathode and that capillary effects can worsen the performance of a cell, especially if it is in an unbalanced state of electrolyte filling.

Authors:
 [1];  [2]
  1. Central Research Inst. of Electric Power Industry, Yokosuka, Kanagawa (Japan)
  2. Illinois Inst. of Technology, Chicago, IL (United States). Dept. of Chemical and Environmental Engineering
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
413400
Resource Type:
Journal Article
Journal Name:
Journal of the Electrochemical Society
Additional Journal Information:
Journal Volume: 143; Journal Issue: 8; Other Information: PBD: Aug 1996
Country of Publication:
United States
Language:
English
Subject:
30 DIRECT ENERGY CONVERSION; 36 MATERIALS SCIENCE; MOLTEN CARBONATE FUEL CELLS; PERFORMANCE; GOLD; WETTABILITY; NICKEL; NICKEL OXIDES; MOLTEN SALTS; REDOX REACTIONS; PORE STRUCTURE; LITHIUM CARBONATES; POTASSIUM CARBONATES

Citation Formats

Mugikura, Y, and Selman, J R. Meniscus behavior of metals and oxides in molten carbonate under oxidant and reducing atmospheres. 1: Contact angle and electrolyte displacement. United States: N. p., 1996. Web. doi:10.1149/1.1837028.
Mugikura, Y, & Selman, J R. Meniscus behavior of metals and oxides in molten carbonate under oxidant and reducing atmospheres. 1: Contact angle and electrolyte displacement. United States. doi:10.1149/1.1837028.
Mugikura, Y, and Selman, J R. Thu . "Meniscus behavior of metals and oxides in molten carbonate under oxidant and reducing atmospheres. 1: Contact angle and electrolyte displacement". United States. doi:10.1149/1.1837028.
@article{osti_413400,
title = {Meniscus behavior of metals and oxides in molten carbonate under oxidant and reducing atmospheres. 1: Contact angle and electrolyte displacement},
author = {Mugikura, Y and Selman, J R},
abstractNote = {The wetting of metals and oxides by molten carbonate is an important factor affecting the performance of a molten carbonate fuel cell (MCFC). The distribution of the electrolyte among electrodes and matrix in the MCFC is dominated by the pore characteristics and wetting properties of these components. However, data on wetting, especially under load (current passage), are limited. In this study, the behavior of the meniscus at a metal is used to obtain information on wetting and electrochemical reactions. Meniscus height and current were measured under various atmospheres. The contact angle was calculated from the meniscus height. The electrolyte distribution in the MCFC was estimated using contact angles thus obtained in oxidant and reducing atmospheres. The results suggest that upon application of load the electrolyte moves from the anode to the cathode and that capillary effects can worsen the performance of a cell, especially if it is in an unbalanced state of electrolyte filling.},
doi = {10.1149/1.1837028},
journal = {Journal of the Electrochemical Society},
number = 8,
volume = 143,
place = {United States},
year = {1996},
month = {8}
}