Experimental work on a CdO-based solar cycle for water splitting
Previous investigations and experimental work performed on a cadmium-based hybrid thermoelectrochemical cycle as a means of water splitting for hydrogen production are described. It also discusses the work plan for a new effort to investigate operation of the key high-temperature endothermic step in a solar furnace-reactor. The chemistry of the cycle is: (1) Cd(s) + 2H/sub 2/O(l) ..-->.. Cd(OH)/sub 2/ + H/sub 2/(g) (electrochemical step that proceeds at V > 0.05 volts); (2) Cd(OH)/sub 2/(s) ..-->.. CdO(s) + H/sub 2/O(g) (thermochemical decomposition that proceeds at T > 300/sup 0/C); and (3) CdO(s) ..-->.. Cd(g) + 1/2 O/sub 2/(g) (thermochemical decomposition that proceeds at T > 1150/sup 0/C). The reaction to be further investigated through experiments in a solar furnace is step (3). Published thermodynamics data for this step are not in good agreement for the range T > 1000/sup 0/C, and prediction of energy consumption and cycle efficiency depend on better knowledge of the operating conditions for this high-temperature step.
- OSTI ID:
- 5817231
- Report Number(s):
- CONF-791143-2
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
080102 -- Hydrogen-- Production-- Thermochemical Processes
14 SOLAR ENERGY
140505* -- Solar Energy Conversion-- Photochemical
Photobiological
& Thermochemical Conversion-- (1980-)
CADMIUM COMPOUNDS
CADMIUM OXIDES
CHALCOGENIDES
CHEMICAL REACTIONS
CHEMICAL REACTORS
CHEMISTRY
CONVERSION
ELECTROCHEMISTRY
ELECTRODES
ELECTROLYTIC CELLS
ENERGY CONVERSION
EXPERIMENT PLANNING
FURNACES
HYDROGEN COMPOUNDS
HYDROGEN PRODUCTION
OXIDES
OXYGEN COMPOUNDS
PLANNING
RESEARCH PROGRAMS
SOLAR ENERGY CONVERSION
SOLAR FURNACES
THERMOCHEMICAL PROCESSES
WATER