Method for improving corrosion resistance of nickel electrode in molten salt system
A nickel electrode and molten salt technology, applied in the direction of electrodes, electrolysis process, electrolysis components, etc., can solve the problem that the electrode problem has not been solved well, the current efficiency of the gas product is reduced, and the electrochemical reaction cannot be guaranteed, so as to improve the selection Sex and current efficiency, extended time, and improved continuity
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Embodiment 1
[0049] Embodiment 1: the corrosion resistance (durability) experiment of preoxidation film-forming nickel electrode
[0050] ① Na 2 CO 3 -K 2 CO 3 A total of 50g of +0.2LiOH mixed molten salt is put into an alumina crucible, the operating temperature is 700°C, and the surface area is 20cm 2 The nickel anode and nickel cathode were inserted into the molten salt medium; in an argon atmosphere, a 3h pre-oxidation film-forming treatment was performed at a constant voltage of 1.0V to obtain a molten salt in-situ pre-oxidation film-forming nickel anode.
[0051] ②Set the surface area to 20cm 2 The nickel electrode was heated in air at 800°C for 2 hours to prepare an air-heated pre-oxidized film-forming nickel anode.
[0052] The pre-oxidized nickel electrode prepared by the above two methods was used as the anode, and the iron with the same surface area was used as the cathode. 0.85 Na 0.61 K 0.54 CO 3 +0.2LiOH mixed molten salt is used as the electrolyte, and the CO 2 / H ...
Embodiment 2
[0058] Embodiment 2: Experiment of the influence of metal oxide on the solubility of nickel oxide in molten salt system
[0059] to Li 0.85 Na 0.61 K 0.54 CO 3 +0.2LiOH molten salt system with different masses of Li added 2 O, CaO and BaO, respectively, to explore the influence of three metal oxides on the solubility of NiO at 575 °C.
[0060] Lithium oxide (Li 2 The relationship between O) and the solubility of NiO in the molten salt system is as follows Figure 5 Shown: In molten salt system, the solubility of NiO increases with Li 2 The increase of O addition presents a gradual upward trend. The reason may be that the addition of lithium oxide provides more positively charged Li in the molten salt system. + ions, which can combine with nickel ions to form eutectic LiNiO which can be dissolved in a large amount in molten salt system 2 , making the solubility of NiO increase. This proves that Li 2 The addition of O is not conducive to slow down the corrosion of nic...
Embodiment 3
[0068] Example 3: Experiment on the influence of metal oxides on gas product selectivity and current efficiency
[0069] Set the surface area to 20cm 2 The nickel electrode was heated in air at 800°C for 2 hours to prepare an air-heated pre-oxidized film-forming nickel anode.
[0070] Use the above-mentioned air heating pre-oxidized film-forming nickel electrode as the anode, and the iron with the same surface area as the cathode, with Li 0.85 Na 0.61 K 0.54 CO 3 +0.2LiOH mixed molten salt is used as the electrolyte, and the CO 2 / H 2 The experiment of synergistic conversion of O to prepare hydrocarbon-rich carbon-based fuel gas, and to Li 0.85 Na 0.61 K 0.54 CO 3 +0.2LiOH mixed molten salts were added with different contents of calcium oxide and barium oxide to explore the effect of adding metal oxides on the methane selectivity and current efficiency in the gas product after the reaction for 240 minutes. The results are as follows Figure 7 and Figure 8 shown. I...
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