Carboxylated carbon nanotube catalyst carrier as well as preparation method and application thereof

A catalyst carrier, carboxylated carbon technology, used in catalyst carriers, physical/chemical process catalysts, chemical instruments and methods, etc., can solve problems such as application difficulties, achieve a high degree of carboxylation, improve inertness and hydrophobicity, and surface containing Oxygen rich effect

Active Publication Date: 2013-07-10
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, carbon nanotube (CNT), as a new type of one-dimensional nanomaterial, has become an ideal cathode catalyst support material because of its large specific surface area, fast electron transfer ability, excellent chemical stability and mechanical strength, and because of CNT itself does not contain a seamless combination of hexagonal rings of unstable bonds, and CNT has a huge molecular weight, and the strong van der Waals interaction between them leads to the strong inertness of CNT, making it insoluble in water and commonly used Organic solvent, which brings certain difficulties to further application

Method used

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  • Carboxylated carbon nanotube catalyst carrier as well as preparation method and application thereof
  • Carboxylated carbon nanotube catalyst carrier as well as preparation method and application thereof
  • Carboxylated carbon nanotube catalyst carrier as well as preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0035] Embodiment 1 (preparation of carboxylated CNT)

[0036] The preparation process of CNT-95 is: take 3g CNT and add to 150mL concentrated HNO with a volume ratio of 3:2 3 and concentrated H 2 SO 4 The mixture was then transferred to a Erlenmeyer flask, refluxed in a water bath at 95°C for 100 minutes, then washed with deionized water in a vacuum filtration device until nearly neutral, and finally dried in air at 110°C for 16 hours.

[0037] The preparation process of CNT-80 is as follows: take 4.5g CNT and add to 240mL concentrated HNO with a volume ratio of 1:3 3 and concentrated H 2 SO 4 The mixed solution was then transferred to a conical flask, refluxed in a water bath at 80°C for 12 hours, then washed with deionized water in a vacuum filtration device until nearly neutral, and finally dried in air at 110°C for 16 hours.

[0038] Through the experiments of carboxylated CNTs under different conditions in this example, two kinds of carboxylated CNTs, namely CNT-80 an...

Embodiment 2

[0039] Example 2 (XPS characterization of carboxylated CNT)

[0040] The XPS tests of untreated CNTs and two carboxylated CNTs were carried out on a multifunctional X-ray photoelectron spectrometer (model Axis Ultra DLD), and the vacuum degree of the analysis chamber was about 5×10 -9 torr, the X light source used is a monochromatic Al Kα source (Mono AlKα), the energy is 1486.6eV, 10mA×15KV, and the beam spot size is 700×300μm; The energy is 40eV, and the number of scans is 1 time. Before the result analysis, the C1s of each sample was divided into peaks, and then the binding energy of C1s at the lowest energy end was calibrated to 284.6eV, and each element was corrected according to the shift of C1s peak position.

[0041] Through the XPS analysis of untreated CNT and two carboxylated CNTs in this example, after acid modification at 95°C, the tube wall of CNT is oxidized, the port is opened, and the surface is formed in addition to groups such as -COOH and -OH. Will genera...

Embodiment 3

[0042] Embodiment 3 (the application of carrier: the preparation of Pt / CNT catalyst)

[0043] Pt / CNT-80 and Pt / CNT-95 catalysts were prepared by impregnation-precipitation method, 0.675gH 2 PtCl 6 ·6H 2 O was dissolved in 25mL of ethanol to prepare a 0.0193mol / L ethanol solution of chloroplatinic acid. According to the theoretical platinum load of 10%, 2.5g of CNT-80 and 3.5g of CNT-95 were placed in the chloroplatinic acid solution respectively. Mix well in ethanol solution, adjust the pH value to 7.5 with 0.2mol / L NaOH solution, add excess 0.1mol / L HCHO solution, reduce at 80°C for 2h, then wash with deionized water until the filtrate is free of Cl - (AgNO 3 solution test), and finally dried in a vacuum desiccator at 80°C for 12 hours. The Pt / CNT catalysts prepared with CNT-80 and CNT-95 are denoted as Pt / CNT-80 and Pt / CNT-95, respectively.

[0044] Through this example, Pt / CNT-80 and Pt / CNT-95 catalysts were obtained by impregnation-precipitation method.

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Abstract

The invention discloses a carboxylated carbon nanotube catalyst carrier as well as a preparation method and application thereof. The preparation method of the carboxylated carbon nanotube catalyst carrier comprises the following steps of: putting carbon nanotubes in the mixed liquid of concentrated HNO3 and concentrated H2SO4 in a volume ratio of (1: 3)-(3: 2) and performing constant-temperature reflux treatment in the range of 80-95 DEG C for 100-120 minutes, and then washing and drying, thereby obtaining the carboxylic carbon nanotube catalyst carrier. The catalyst carrier is used for preparing Pt/CNT catalyst; the obtained Pt/CNT catalyst is used as an air cathode material for preparing a single-cavity membrane-free air cathode microbial fuel cell. The rich oxygen-containing groups are introduced on the surface of the catalyst carrier prepared by the method, so that the oxygen reduction effect of the catalyst is improved; and the Pt/CNT catalyst prepared from the catalyst carrier succeeds in starting MFC (Micro Function Circuit) so that the start period of MFC is shortened, the internal resistance of MFC can be reduced and the output voltage of MFC also can be greatly increased.

Description

technical field [0001] The invention belongs to the field of biological energy materials, and in particular relates to a carboxylated carbon nanotube catalyst carrier and a preparation method and application thereof. Background technique [0002] Microbial fuel cells (MFCs) are electrochemical devices that use microorganisms as biocatalysts to degrade organic matter to generate electricity. The unique power generation method of MFCs makes it a new idea to solve the energy crisis and treat wastewater at the same time. However, the research on MFCs is still in the research stage of the laboratory, and there are still many challenges to be applied to practical engineering. Among them, the low power generation capacity is one of the main obstacles restricting the commercialization of this technology. [0003] There are many factors that lead to the low power generation capacity of MFCs, among which the inefficient and slow oxygen reduction thermodynamics and kinetics of the cat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J32/00B01J21/18B01J23/42H01M4/86H01M4/88H01M4/90H01M4/92
CPCY02E60/50
Inventor 朱能武涂丽杏吴平霄
Owner SOUTH CHINA UNIV OF TECH
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