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Preparation method and application of electro-catalytic oxygen reduction catalytic material N-PC @CBC

A catalytic material and electrocatalytic technology, applied in the direction of electrochemical generators, circuits, electrical components, etc., to achieve large surface area, excellent ORR performance, and ensure the effect of surface area

Pending Publication Date: 2020-10-02
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, during the carbonization process, due to the lack of support, ZIF-8 accumulates and loses a large number of effective active sites, resulting in the onset potential of the material being only 0.734V (vs.RHE)

Method used

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  • Preparation method and application of electro-catalytic oxygen reduction catalytic material N-PC @CBC
  • Preparation method and application of electro-catalytic oxygen reduction catalytic material N-PC @CBC
  • Preparation method and application of electro-catalytic oxygen reduction catalytic material N-PC @CBC

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Example 1: Preparation of material N-PC@CBC:

[0037] (1) Disperse 0.1 g of BC and 4.75 mmol of zinc nitrate hexahydrate in 100 mL of methanol. After stirring for 24 hours, the well-dispersed mixture was added to a solution of 2-methylimidazole dissolved in 100 mL of 20 mmol in methanol.

[0038] (2) The mixture was stirred for 2 h and allowed to stand at room temperature for 24 h to form the ZIF-8@BC nanofiber composite, and the resulting material was freeze-dried.

[0039] (3) Carbonize the dried material in a tube furnace under an Ar atmosphere. The temperature programming steps are as follows: the temperature is 2 °C min -1 The rate was increased from room temperature to 800 °C, and then held at 800 °C for 2 hours. Thereafter, first at 2°C min -1 Decrease the temperature to 600°C at a rate of 5°C min -1 rate down to room temperature. The product N-PC@CBC was obtained. The obtained product has the best ORR catalytic activity, at 0.1mol -1 / L of KOH solution, ...

Embodiment 2

[0040] Embodiment 2: in the step (3) in the embodiment 1, the temperature programming step is: the temperature is 2 ℃ min -1 The rate was increased from room temperature to 900 °C, and then held at 900 °C for 2 hours. Thereafter, first at 2°C min -1 Decrease the temperature to 900°C at a rate of 5°C min -1 rate down to room temperature. Other steps are with embodiment 1. The ORR catalytic performance of the obtained product: at 0.1mol -1 / L of KOH solution, the onset potential is 0.814V, and the half-wave potential is 0.755V.

Embodiment 3

[0041]Embodiment 3: The material obtained in Embodiment 1 is made into an electrode by a film coating method, which is used for the negative electrode of a sodium ion battery. The material ratio is obtained material: conductive substance: binder = 8:1:1. The performance of coin-type batteries assembled with electrodes made of the obtained materials was evaluated by CV and galvanostatic charge / discharge tests. After the first few cycles, the CV curves gradually overlap in subsequent cycles, indicating good reversibility during Na ion storage. The initial charge and discharge capacities of the fabricated batteries were 348 and 620 mAh g, respectively. -1 , corresponding to an initial Coulombic efficiency of 56.1%. The Coulombic efficiency gradually increases in the first few cycles and maintains a high value close to 100% in subsequent cycles. The battery made at 0.1A g -1 exhibited good cycling stability at low current densities and achieved 200mAh g after 400 cycles -1 Ab...

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Abstract

The invention relates to an electrocatalytic oxygen reduction catalytic material N-PC@CBC as well as a preparation method and application thereof. The preparation method comprises the following stepsof S1, dispersing bacterial cellulose (BC) and zinc nitrate hexahydrate into methanol, and dissolving 2-methylimidazole into a methanol solution with the same volume; S2, stirring the two solutions obtained in the step S1, and standing to form a ZIF-8-coated BC nanofiber composite material; and S3, freezing and drying the ZIF-8-coated BC material and carrying out high-temperature carbonization toobtain the N-PC@CBC material. The preparation method provided by the invention has the characteristics of excellent performance, simple process flow, low cost, safety, environmental protection and thelike, and compared with a commercial 20wt% Pt / C catalyst, the obtained catalyst shows better methanol tolerance and stability in an alkaline medium, and a sodium ion battery prepared by taking the obtained product as an electrode shows good cycling stability and has high specific capacity after multiple cycles.

Description

technical field [0001] The invention relates to the technical field of battery catalysts, in particular to a catalyst material for electrocatalytic oxygen reduction reaction in an alkaline medium, a negative electrode material N-PC@CBC for a sodium ion battery, and a preparation method and application thereof. Background technique [0002] Recently, the increasing energy consumption and environmental degradation worldwide have drawn extensive attention from researchers, and high-performance fuel cells and metal-air batteries have attracted much attention due to their high energy density, excellent energy conversion efficiency, and low dependence on fossil fuels. It has become a high-profile electrochemical energy conversion device. Typically, the performance of fuel cells and metal-air batteries depends on the oxygen reduction reaction (ORR) at the cathode, which is kinetically slow and thus needs to be accelerated using ORR electrochemical catalysts. Although Pt-based cata...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/88H01M4/90H01M4/36H01M10/054
CPCH01M4/8825H01M4/9075H01M4/362H01M10/054Y02E60/10Y02E60/50
Inventor 孙东平唐开元黄洋张威威袁凡舒
Owner NANJING UNIV OF SCI & TECH
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