Kinetics and transport processes in aqueous polysulfide-electrode reactions
The objectives of this research are to obtain information on the electrochemical and chemical reactions of the aqueous sulfide/polysulfide redox couple and to use that information to design a stable and efficient redox electrode. The kinetics of the aqueous polysulfide redox couple were investigated using a transient potential step technique in a solution 1M in S/sup 0/ and 1.3M in total S/sup 2 -/, at pH 12. The steady-state current density-overpotential relationships for cobalt and platinum rotating-disk electrodes were determined for a range of temperatures. A model was developed to take into account the chemical and electrochemical reaction rates. The addition of 13 mole-% DMF to the aqueous polysulfide solution was found to significantly increase the current density, at a given temperature and overpotential, by increasing the equilibrium concentration of S/sub 2//sup -/. A flow cell for testing flow-through porous electrodes was constructed and operated. The effect of electrode material, temperature, flow rate, and the addition of DMF on electrode performance was studied. MoS/sub 2/, Co, and Ni were used as electrocatalyst materials. Raising the temperature and/or the addition of DMF had much larger effects than an order of magnitude increase in the flow rate.
- Research Organization:
- California Univ., Berkeley (USA)
- OSTI ID:
- 7162532
- Resource Relation:
- Other Information: Thesis (Ph. D.)
- Country of Publication:
- United States
- Language:
- English
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