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Preparation method of ZIF-8 derived Fe-N-C oxygen reduction electrocatalyst

A ZIF-8, electrocatalyst technology, used in chemical instruments and methods, physical/chemical process catalysts, circuits, etc., can solve the problems of catalysts that do not well maintain secondary microstructure and low catalytic activity.

Inactive Publication Date: 2020-11-20
UNIV OF JINAN
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Problems solved by technology

Although there have been many reports of M-N-C nanocatalysts applied to oxygen reduction electrocatalysis, there are still many catalysts that do not maintain the secondary microstructure well (Chem. Sci. 2013, 4, 2941-2946.), or the catalytic activity Not high (Electrochim. Acta 2014,119, 192-205.) and other shortcomings

Method used

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  • Preparation method of ZIF-8 derived Fe-N-C oxygen reduction electrocatalyst
  • Preparation method of ZIF-8 derived Fe-N-C oxygen reduction electrocatalyst
  • Preparation method of ZIF-8 derived Fe-N-C oxygen reduction electrocatalyst

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Embodiment 1

[0019] (1) Preparation and characterization of Fe-N-C electrocatalyst:

[0020] 1.07 g Zn(NO 3 ) 2 .6H 2 O was added to 40 mL of methanol, and the resulting mixed solution was denoted as A; then 2.35 g of dimethylimidazole and x mg hemin ( x =0, 20, 35, 55, 85) into 40 mL of methanol to obtain a mixed solution, which is denoted as B; then solution A was quickly added to solution B under vigorous stirring, and reacted at room temperature for 24 h; finally, the obtained product Centrifuge and wash several times, and vacuum dry at 70 ℃ for one night; according to the amount of hemin added, we respectively record the products as Hemin@ZIF-8, Hemin 20 @ZIF-8, Hemin 35 @ZIF-8, Hemin 55 @ZIF-8 and Hemin 85 @ZIF-8. The above products were transferred to a ceramic boat and placed in a tube furnace, heated to 900 °C for 3 h at a rate of 5 °C per second in a nitrogen atmosphere, and the obtained products were respectively denoted as N-C, Fe 20 -N-C, Fe 35 -N-C, Fe 55 -N-C and...

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Abstract

The invention provides a preparation method of a ZIF-8 derived Fe-N-C oxygen reduction electrocatalyst, which comprises the following steps: adding Zn(NO3)2.6H2O into methanol to obtain a mixed solution A, then adding dimethylimidazole and hemagglutinin into methanol to obtain a mixed solution, marking the mixed solution as B, then rapidly adding the solution A into the solution B under violent stirring, reacting at room temperature, drying the obtained product, and carrying out high-temperature heating and heat preservation to obtain Fex-N-C. The method has the advantages of low raw materialand preparation cost, no pollution, high product catalytic activity, excellent methanol resistance and high stability. The influence of the Fe doping amount on the oxygen reduction activity is systematically studied, the optimal Fe55-N-C catalyst is obtained, the half-slope potential is 0.892 V vs RHE under the alkaline condition, the dynamic current density is 17.5 mA cm<-2> under the 0.80 V potential, and the catalytic performance is higher than that of commercial platinum carbon.

Description

technical field [0001] The invention relates to a preparation method of a ZIF-8 derived Fe-N-C oxygen reduction electrocatalyst, belonging to the technical field of non-precious metal catalysts in electrocatalysis. Background technique [0002] As a new type of energy conversion device, the fuel cell converts the chemical energy of the fuel into electrical energy through an electrochemical catalytic process in its anode reaction, so energy conversion can be realized. In order to ensure the normal conversion of fuel cell energy while reducing costs, the cathode process is often the oxygen reduction reaction (oxygen reduction reaction, ORR). The content of oxygen in air is relatively high (21%), so air can be directly used as the source of oxygen required for the cathode reaction. However, the ORR efficiency is low, which limits the efficient energy conversion of fuel cells. Commercial platinum carbon has high ORR activity under ideal conditions, but it is expensive, poorly ...

Claims

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Application Information

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IPC IPC(8): B01J27/24B01J35/10H01M4/90
CPCB01J27/24H01M4/9041H01M4/9083B01J35/33B01J35/60Y02E60/50
Inventor 逯一中刘文栋姜媛媛陈传霞倪朋娟王波张成会
Owner UNIV OF JINAN
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