Carbon-supported bimetallic single-atom electrocatalysts and their preparation and applications
An electrocatalyst and bimetallic technology, applied in the field of electrochemistry, can solve problems such as hindering the activity of single-atom catalysts, cumbersome preparation methods, and large surface energy, and achieve the effects of easy industrial production, simple process, and mild conditions
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[0029] A method for preparing a carbon-supported bimetallic single-atom electrocatalyst, comprising the steps of:
[0030] (1) Mix the porous carbon rich in vacancy defects with the metal precursor solution to obtain a suspension;
[0031] (2) At room temperature, the suspension in step (1) is subjected to ultrasonic and light treatment at the same time;
[0032] (3) Filtrating, washing and high-temperature nitriding treatment on the reactant in step (2) to obtain a carbon-supported bimetallic single-atom catalyst;
[0033] Wherein, the metals are cobalt and nickel.
[0034] Preferably, the porous carbon rich in vacancy defects described in step (1) is prepared by the following method: soaking the porous carbon in nitric acid solution, and then ablation in air.
[0035] Preferably, the mass fraction of the nitric acid solution is 10-40%, such as 10, 20, 30, 40%, and the soaking time is 1-5h, such as 1, 2, 3, 4, 5h; the ablation temperature is 150-200°C, such as 150, 160, 17...
Embodiment 1
[0050] Soak 10g of porous carbon in 10wt% nitric acid aqueous solution for 5h, and then ablate it in an air atmosphere at 150°C for 60min to obtain porous carbon rich in vacancies; configure 20mL of 0.01mol / L metal precursor solution, in which The precursor is a mixture of cobalt iodide and nickel bromide (Co / Ni=2, molar ratio), and the solvent is water; the porous carbon rich in vacancy and the metal precursor solution are mixed to obtain a suspension; at room temperature, The suspension was subjected to UV irradiation and ultrasonic treatment for 10 min at the same time, filtered, washed 2-3 times with deionized water, and annealed in a nitrogen atmosphere at 500 ° C for 4 h to obtain a carbon-supported bimetallic single atom with a metal loading of 0.1 wt%. electrocatalyst.
Embodiment 2
[0052] Soak 55g of porous carbon in 40wt% nitric acid aqueous solution for 1h, and then ablate it in an air atmosphere at 200°C for 20min to obtain porous carbon rich in vacancies; prepare 10mL of 1mol / L metal precursor solution, in which the metal precursor The body is a mixture of cobalt bromide and nickel iodide (Co / Ni=1, molar ratio), and the solvent is a mixture of water and ethanol (water:ethanol=2:8, volume ratio); the porous carbon rich in vacancy Mix with the metal precursor solution to obtain a suspension; at room temperature, the suspension is subjected to ultraviolet light and ultrasonic treatment for 60 minutes at the same time, filtered, washed with deionized water 2-3 times, and annealed in a nitrogen atmosphere at 900 ° C for 2 hours. A carbon-supported bimetallic single-atom electrocatalyst with a metal loading of 2wt% was obtained.
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