Method for preparing membrane electrode based on carbon supported transition metal chelate
A transition metal and membrane electrode technology, applied in battery electrodes, circuits, fuel cells, etc., can solve the problems of poor adhesion, high resistance, and poor contact of transition metal chelates
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Embodiment 1
[0025] (1) The proton exchange membrane (U.S. DuPont 212 membrane) was boiled for 1 hour at 60 DEG C with 4% by weight of hydrogen peroxide, 0.1 mol / L of nitric acid at 80 DEG C for 1 hour, and 0.5 mol / L of sulfuric acid at 80 DEG C. Cook at 80°C for 1 hour, and store the pretreated proton exchange membrane in a solution of ultrapure water and ethylene glycol at a ratio of 1:1.
[0026] (2) Weigh 6.0 mg carbon-supported platinum catalyst (E-tek company) into a 25 ml beaker, add 0.05 ml water and 0.80 ml isopropanol for ultrasonic dispersion for 20 min, then add 0.06 ml Nafion solution, and continue ultrasonic dispersion for 10 min.
[0027] (3) Take by weighing 0.404g cobalt chloride and be dissolved in 50ml ethanol, add 1ml triethylenetetramine and 1 gram of BP2000 carbon powder respectively, roast under the condition of 800 ℃, make carbon-loaded cobalt triethylenetetramine chelate catalyst, Weigh 7.0 mg of the carbon-supported cobalt triethylenetetramine chelate catalyst pre...
Embodiment 2
[0040] (1) The proton exchange membrane (U.S. DuPont 212 membrane) was boiled for 1 hour at 80 DEG C with 3% by weight of hydrogen peroxide, 0.1 mol / L of nitric acid for 1 hour at 80 DEG C, and 0.5 mol / L of sulfuric acid at 80 DEG C. Boil at 80°C for 1 hour, and store the pretreated proton exchange membrane in a solution of ultrapure water isopropanol and ethylene glycol in a ratio of 1:1:2.
[0041] (2) Weigh 6 mg of carbon-supported platinum catalyst (E-tek company) into a 25 ml beaker, add 0.05 ml of water and 0.80 ml of isopropanol for ultrasonic dispersion for 20 min, then add 0.06 ml of Nafion solution, and continue for ultrasonic dispersion for 10 min.
[0042] (3) Take by weighing 0.404g cobalt chloride and be dissolved in 50ml ethanol, add 1ml triethylenetetramine and 1 gram of BP2000 carbon powder respectively, roast under the condition of 800 ℃, make carbon-loaded cobalt triethylenetetramine chelate catalyst, Weigh 7.0 mg of the carbon-supported cobalt triethylenete...
Embodiment 3
[0055] The electrode described in Example 2 is placed in the single cell, and the effective area of the membrane electrode is 5 cm 2 . Activated for 8h according to the method described in this example. During the operation of the single cell, the AC impedance spectrum of the single cell was measured with a CHI-6 electrochemical tester. The frequency of AC signal is 10kHz~0.1Hz, and the amplitude of sine wave potential is 5mV. The reference electrode and auxiliary electrode of the instrument are connected to the anode (hydrogen electrode) of the single cell, and the working electrode is connected to the cathode (oxygen electrode). When the single cell is running in a steady state, its discharge potential is controlled to 0.5V through the electronic load, and the AC impedance spectrum is recorded. Spectrum see Figure 4 . Through comparison with Comparative Example 3, it can be found that the membrane electrode prepared according to this example has smaller ohmic impedan...
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