Composite thin film anode catalyst of direct methanol fuel cell and preparation method thereof

A methanol fuel cell and composite thin film technology, which is applied in the direction of solid electrolyte fuel cells, battery electrodes, chemical instruments and methods, etc., can solve the problems of limited development and application, catalyst poisoning, high price, etc., and achieve the enhancement of anti-poisoning ability, catalytic Improved ability and good uniformity

Inactive Publication Date: 2010-05-26
FUJIAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the catalysts used in DMFC are mainly Pt-based noble metal catalysts in both the anode and cathode, but this kind of catalyst not only faces the problems of resource s

Method used

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  • Composite thin film anode catalyst of direct methanol fuel cell and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] 1. Cleaning:

[0022] The glassy carbon electrode substrates were sequentially coated with 1.0, 0.3 and 0.05 μm α-Al 2 o 3 powder polishing, and then ultrasonically cleaned in ethanol solution and distilled water for 10 min successively. -1 h 2 SO 4 Control the potential range of -0.25V to 1.25V in the solution for cyclic potential scanning until a stable standard cyclic voltammogram is obtained.

[0023] 2. Cationization:

[0024] Place the cleaned glassy carbon electrode substrate in 5mmol·L -1 Soak in the ethanol solution of p-aminothiophenol for 15 hours, take it out, wash it with distilled water, and dry it with nitrogen to obtain a cationized glassy carbon electrode substrate.

[0025] 3. Film self-assembly:

[0026] Put the cationized glassy carbon electrode substrate in 5mmol·L -1 PMo 12 +H 2 PtCl 6 In the solution, in the potential range of -0.15V ~ 0.7V at 100mV s -1 The scanning speed was scanned for 40 weeks, washed with ethanol solution and dei...

Embodiment 2

[0031] 1. Cleaning:

[0032] The glassy carbon electrode substrates were sequentially coated with 1.0, 0.3 and 0.05 μm α-Al 2 o 3 powder polishing, and then ultrasonically cleaned in ethanol solution and distilled water for 15 min successively. -1 h 2 SO 4 Control the potential range of -0.25V to 1.25V in the solution for cyclic potential scanning until a stable standard cyclic voltammogram is obtained.

[0033] 2. Cationization:

[0034] Place the cleaned glassy carbon electrode substrate in 9mmol·L -1 Soak in the ethanol solution of p-aminothiophenol for 12 hours, take it out, wash it with distilled water, and dry it with nitrogen to obtain a cationized glassy carbon electrode substrate.

[0035] 3. Film self-assembly:

[0036] Put the cationized glassy carbon electrode substrate in 8mmol·L -1 Si 2 Mo 18 +H 2 PtCl 6 In the solution, in the range of potential -0.25 ~ 0.65V at 50mV s -1 Speed ​​scanning for 30 weeks, washed with ethanol solution and deionized wate...

Embodiment 3

[0040] 1. Cleaning:

[0041] The glassy carbon electrode substrates were sequentially coated with 1.0, 0.3 and 0.05 μm α-Al 2 o 3 powder polishing, and then ultrasonically cleaned in ethanol solution and distilled water for 5 min successively. -1 h 2 SO 4 Control the potential range of -0.25 to 1.25V in the solution for cyclic potential scanning until a stable standard cyclic voltammogram is obtained.

[0042] 2. Cationization:

[0043] Place the cleaned glassy carbon electrode substrate in 3mmol·L -1 Soak in the p-aminothiophenol ethanol solution for 20 hours, take it out, wash it with distilled water, and dry it with nitrogen to obtain a cationized glassy carbon electrode substrate.

[0044] 3. Film self-assembly:

[0045] Put the cationized glassy carbon electrode substrate in 10mmol·L -1 SiW 12 +H 2 PtCl 6 In the solution, in the potential range of -0.3 ~ -0.9V at 80mV s -1 The scanning speed was scanned for 40 weeks, and then washed with ethanol solution and d...

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Abstract

The invention relates to a composite thin film anode catalyst applied to a direct methanol fuel cell (DMFC), in particular to a self-assembled composite film of polyoxometallate-Ptnano and PAMAM dendrimer which is applied to the anode catalyst for the DMFC, and a preparation method thereof. At first, a glassy carbon electrode substrate is cleaned, and then, a layer-by-layer self-assembling method is utilized to prepare the anode catalyst capable of being applied to the DMFC, the procedure is characterized in that: putting the cleaned glassy carbon electrode substrate in p-amino thiophenol alcohol solution to carry out cationization, carrying out first-time circular scanning in the solution containing polyoxometallate and chloroplatinic acid; and finally putting in PAMAM dendrimer solution which takes HCl solution as solvent to carry out the second-time circular scanning; and repeating the above scanning process for 2-7 times. The prepared composite thin film has good catalytic activity on the oxidization of methanol, the activity is reinforced with the increasing of the layer number of the thin film, and polyoxometallate and PAMAM in the composite film have good promotion function on the oxidization of Pt-catalyzed methanol.

Description

technical field [0001] The present invention relates to a composite film catalyst for direct methanol fuel cell anode, in particular to a polyoxometalate-Pt catalyst for direct methanol fuel cell anode nano Self-assembled composite film with polyamide-amine dendrimers and preparation method thereof. Background technique [0002] Direct Methanol Fuel Cell (DM FC) has attracted extensive attention due to its rich and easily available fuel sources, convenient storage and transportation, and has broad application prospects. At present, the catalysts used in DMFC are mainly Pt-based noble metal catalysts in both the anode and cathode, but this kind of catalyst not only faces the problems of resource shortage and high price, but also the catalyst is easily poisoned by intermediate products of methanol oxidation (such as CO, etc.) , thus limiting its development and application. [0003] In view of the above problems, the current research is to replace pure platinum catalysts wit...

Claims

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Application Information

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IPC IPC(8): H01M4/88H01M4/90H01M8/10B01J31/28
CPCY02E60/523Y02E60/50Y02P70/50
Inventor 林深罗明洪张晓凤
Owner FUJIAN NORMAL UNIV
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