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Preparation method of Fe/N/C codoped electrocatalyst for efficient oxygen reduction reaction and application of Fe/N/C codoped electrocatalyst for efficient oxygen reduction reaction

An electrocatalyst and co-doping technology, applied in the field of electrocatalysis, can solve problems such as complex preparation methods, and achieve the effects of simple preparation process, improved electrical conductivity, and favorable adsorption and desorption.

Inactive Publication Date: 2019-06-21
QUFU NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, most of the reported preparation methods are relatively complicated, and it is especially necessary to develop a non-precious metal ORR catalyst with simple preparation process and excellent performance.

Method used

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  • Preparation method of Fe/N/C codoped electrocatalyst for efficient oxygen reduction reaction and application of Fe/N/C codoped electrocatalyst for efficient oxygen reduction reaction
  • Preparation method of Fe/N/C codoped electrocatalyst for efficient oxygen reduction reaction and application of Fe/N/C codoped electrocatalyst for efficient oxygen reduction reaction
  • Preparation method of Fe/N/C codoped electrocatalyst for efficient oxygen reduction reaction and application of Fe/N/C codoped electrocatalyst for efficient oxygen reduction reaction

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) Dissolve 40 mg of pretreated carbon black, 1.60 g of glucose, and 20 mg of sodium dodecylsulfonate into 20 ml of secondary water, sonicate for 4 h to form a uniform black suspension, and then add 0.5 mmol Ferric nitrate, transfer the solution to a hydrothermal reaction kettle, set the oven temperature to 180 °C, and the reaction time is 15 h, naturally cool to room temperature, filter with suction, wash with secondary water three times, dry in a vacuum oven at 60 °C, fully A black powder was obtained after grinding.

[0032](2) Take 80 mg of black powder sample (intermediate product) and 800 mg of melamine and mix them thoroughly and place them in a tube furnace with a mass ratio of 1:10. Pyrolyze at high temperature under nitrogen atmosphere, and the pyrolysis temperature is 900 ℃, time 1 h, heating rate 10 ℃ / min, to obtain a black solid powder, denoted as Fe 0.5 NC-900-2.

Embodiment 2

[0034] (1) Dissolve 40 mg of pretreated carbon black, 1.60 g of glucose, and 20 mg of sodium dodecylsulfonate into 20 ml of secondary water, sonicate for 4 h to form a uniform black suspension, and then add 1.5 mmol Ferric nitrate, transfer the solution to a hydrothermal reaction kettle, set the oven temperature to 180 °C, and the reaction time is 15 h, naturally cool to room temperature, filter with suction, wash with secondary water three times, dry in a vacuum oven at 60 °C, fully A black powder was obtained after grinding.

[0035] (2) Take 80 mg of black powder sample (intermediate product) and 800 mg of melamine and mix them thoroughly and place them in a tube furnace with a mass ratio of 1:10. Pyrolyze at high temperature under nitrogen atmosphere, and the pyrolysis temperature is 900 ℃, time 1 h, heating rate 10 ℃ / min, to obtain a black solid powder, denoted as Fe 1.5 NC-900-2.

Embodiment 3

[0037] (1) Dissolve 40 mg of pretreated carbon black, 1.60 g of glucose, and 20 mg of sodium dodecylsulfonate into 20 ml of secondary water, sonicate for 4 h to form a uniform black suspension, and then add 2.5 mmol Ferric nitrate, transfer the solution to a hydrothermal reaction kettle, set the oven temperature to 180 °C, and the reaction time is 15 h, naturally cool to room temperature, filter with suction, wash with secondary water three times, dry in a vacuum oven at 60 °C, fully A black powder was obtained after grinding.

[0038] (2) Take 80 mg of black powder sample (intermediate product) and 800 mg of melamine and mix them thoroughly and place them in a tube furnace with a mass ratio of 1:10. Pyrolyze at high temperature under nitrogen atmosphere, and the pyrolysis temperature is 900 ℃, time 1 h, heating rate 10 ℃ / min, to obtain a black solid powder, denoted as Fe 2.5 NC-900-2.

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Abstract

The present invention belongs to the technical field of electro-catalysis, and especially relates to a preparation method of a Fe / N / C codoped electrocatalyst for efficient oxygen reduction reaction and application of a Fe / N / C codoped electrocatalyst for efficient oxygen reduction reaction. The composition of the Fe / N / C codoped electrocatalyst for efficient oxygen reduction reaction mainly comprises two steps consisting of a hydrothermal reaction step and a high-temperature pyrolysis step. The step 1 is that: carbon black, glucose, sodium dodecyl sulfate and a ferric salt dissolved into secondary water for ultrasonic treatment to form a uniform suspension liquid, and the mixed solution is put into a reaction kettle to perform the hydrothermal reaction to obtain black solid powder, namely aprecursor; and the step 2 is that: the precursor is fully mixed with a nitrogen source in a certain proportion for high-temperature calcinations in a nitrogen atmosphere to obtain a Fe / N / C codoped catalyst. According to the prepared catalyst, it can be seen that the obvious active particles are uniformly doped into a carbon skeleton, a related electrochemical testing result shows that the catalystcan effectively catalyze the oxygen reduction reaction (ORR) in an alkaline medium, the half-wave potential of the Fe / N / C codoped electrocatalyst reaches 821 mV (compared to a reversible hydrogen electrode) which is slightly lower than a commercial Pt / C with 857mV, and the Fe / N / C codoped electrocatalyst has the better stability and methanol tolerance performance than the commercial Pt / C.

Description

technical field [0001] The invention belongs to the technical field of electrocatalysis, and in particular relates to a method for preparing an Fe / N / C co-doped catalyst for high-efficiency oxygen reduction reaction and its application. Background technique [0002] As a new green energy source, fuel cell has attracted more and more attention because of its high efficiency and environmental protection. The oxygen reduction process (ORR) at the fuel cell cathode is a very important half-reaction, but its slow reaction kinetics greatly limits the efficiency of fuel cells. At present, platinum and its alloy catalysts are considered to be the best ORR catalysts, but their high price and low reserves have caused huge limitations to the large-scale commercial application of fuel cells. Therefore, it is necessary to design and develop new inexpensive non-precious metal catalysts with excellent performance to replace platinum-based catalysts. [0003] Non-noble metals such as Fe, C...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/88H01M4/90
CPCY02E60/50
Inventor 冯媛媛扈华帅司思刘瑞杰
Owner QUFU NORMAL UNIV
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