Method for combined production of hydrogen and hydroxide by water electrolysis with low power consumption
A hydroxide and electrolyte technology, applied in the electrolysis process, electrolysis components, electrodes, etc., can solve the problems of large volume, lowering the voltage of the hydrogen production tank, and complex process.
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[0023] 2. Preparation of electrolytic system
[0024] The electrolytic system here is an alkaline system.
[0025] The alkaline system consists of LiOH, KOH, NaOH, Ba(OH) 2 and other electrolytes as the basic components, adding auxiliary electrolytes, such as LiCl, Mg(NO 3 ) 2 、Na 2 SO 4 etc. as auxiliary components. After dissolving it in water, the concentration of hydroxide ion is 0.1-7.0mol L -1 , the total concentration of auxiliary electrolyte is 0.5-7.0mol L -1 .
[0026] 3. Electrolysis reaction
[0027] The conditions for electrolytic hydrogen production and co-production of hydroxide are:
[0028] Voltage: 0.1-2.0V;
[0029] Electrolytic system: the concentration of hydroxide ions is 0.1-7.0mol L -1 , the total concentration of auxiliary electrolyte is 0.5-7.0mol L -1 .
[0030] Anode: Group III and transition metals.
[0031] The anode adopts the main group III and transition metals, and performs electrolysis in the above electrolysis system, and the e...
Embodiment 1
[0034] In a closed self-made electrolytic cell, add auxiliary electrolyte LiCl and strong alkali NaOH to make an aqueous solution of 1.0-3.2L, and the concentration of LiCl in the solution is 1.0mol L -1 , the concentration of NaOH is 1.0mol L -1 , the anode nickel plate and the cathode copper plate are activated and then placed in the electrolytic cell, the direct current is applied, the cathode current density is constant, the reaction temperature is room temperature, and the electrolytic cell adopts strong stirring for electrolysis. The changes of cell voltage and current efficiency with the production of hydrogen and hydroxide during the electrolysis process are shown in Table 1 below.
[0035] Table 1 Variation of cell voltage and current efficiency with hydrogen production and nickel hydroxide production
[0036]
[0037] Note: The anode is metal nickel, the electrolyte is composed of LiCl and NaOH, and the concentration is 1mol L -1
Embodiment 2
[0039] In a closed self-made electrolytic cell, add auxiliary electrolyte LiCl and strong alkali NaOH to make an aqueous solution of 1.0-3.2L, and the concentration of LiCl in the solution is 1.0mol L -1 , the concentration of NaOH is 1.0mol L -1 , put the anode aluminum plate and the cathode copper plate in the electrolytic cell after activation, pass direct current, the cathode current density is constant, the reaction temperature is room temperature, and the electrolytic cell adopts strong stirring to carry out electrolysis. The changes of cell voltage and current efficiency with the production of hydrogen and hydroxide during the electrolysis process are shown in Table 2 below.
[0040] Table 2 Changes of cell voltage and current efficiency with hydrogen production and aluminum hydroxide production
[0041] Hydrogen production (L) 10 20 30 40 50 60 Aluminum hydroxide output (mol) 0.29 0.58 0.87 1.16 1.45 1.74 Cell pressure (V) 0.70 0.80 ...
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