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Preparation and application of platinum/nickel hydroxide-cobalt hydroxide/graphene three-dimensional composite catalyst

A technology of nickel hydroxide and cobalt hydroxide, applied in the field of nanomaterials, achieves the effects of low cost, avoiding the use of toxic reducing agents or dispersants, and low experimental operation requirements

Active Publication Date: 2016-07-27
QINGDAO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The purpose is to use the three-dimensional structure of graphene combined with the network structure of nickel hydroxide-cobalt hydroxide to construct a three-dimensional structure carrier with hierarchical pores, to overcome the problem of graphene agglomeration to a certain extent, and at the same time, the ultra-high specific surface area of ​​graphene and Excellent conductivity can make up for the poor conductivity of nickel hydroxide-cobalt hydroxide, thereby promoting electron transfer and mass transfer in the redox process, and improving the dispersion and stability of catalyst particles

Method used

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  • Preparation and application of platinum/nickel hydroxide-cobalt hydroxide/graphene three-dimensional composite catalyst
  • Preparation and application of platinum/nickel hydroxide-cobalt hydroxide/graphene three-dimensional composite catalyst

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Experimental program
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Effect test

Embodiment 1

[0051] 1. Preparation of Composite Catalyst

[0052] According to the Hummers method, 325-mesh graphite was oxidized to graphite oxide, and a certain amount of graphite oxide was added to deionized water, and ultrasonically treated in an ultrasonic cleaning machine until the graphite oxide was uniformly dispersed, and the obtained concentration was 2 mg·mL. -1 ~4.5mg·mL -1 graphene oxide solution, and then add a certain amount of lithium perchlorate to obtain different concentrations of graphene oxide and a concentration of 0.1mol L -1 mixed solution of lithium perchlorate.

[0053] Connect the three-electrode system of reference electrode (calomel electrode), counter electrode (platinum wire electrode) and working electrode (conductive glass) on the electrochemical workstation, immerse in the mixed solution of graphene oxide and lithium perchlorate, in- Cyclic voltammetry scan in the range of 1.5V ~ 0.6V (sweep speed is 25mV s -1 ), scan 3 to 10 circles to prepare three-di...

Embodiment 2

[0065] 1. Preparation of Composite Catalyst

[0066] According to the Hummers method, 325-mesh graphite was oxidized to graphite oxide, and a certain amount of graphite oxide was added to deionized water, and ultrasonically treated in an ultrasonic cleaning machine until the graphite oxide was uniformly dispersed, and the obtained concentration was 2 mg·mL. -1 ~4.5mg·mL -1 graphene oxide solution, and then add a certain amount of lithium perchlorate to obtain different concentrations of graphene oxide and a concentration of 0.1mol L -1 mixed solution of lithium perchlorate.

[0067] Connect the three-electrode system of reference electrode (calomel electrode), counter electrode (platinum wire electrode) and working electrode (conductive glass) on the electrochemical workstation, immerse in the mixed solution of graphene oxide and lithium perchlorate, in- Cyclic voltammetry scan in the range of 1.5V ~ 0.6V (sweep speed is 25mV s -1 ), scan 3 to 10 circles to prepare three-di...

Embodiment 3

[0071] 1. Preparation of Composite Catalyst

[0072] According to the Hummers method, 325-mesh graphite was oxidized to graphite oxide, and a certain amount of graphite oxide was added to deionized water, and ultrasonically treated in an ultrasonic cleaning machine until the graphite oxide was uniformly dispersed, and the obtained concentration was 2 mg·mL. -1 ~4.5mg·mL -1 graphene oxide solution, and then add a certain amount of lithium perchlorate to obtain different concentrations of graphene oxide and a concentration of 0.1mol L -1 mixed solution of lithium perchlorate.

[0073] Connect the three-electrode system of reference electrode (calomel electrode), counter electrode (platinum wire electrode) and working electrode (conductive glass) on the electrochemical workstation, immerse in the mixed solution of graphene oxide and lithium perchlorate, in- Cyclic voltammetry scan in the range of 1.5V ~ 0.6V (sweep speed is 25mV s -1 ), scan 3 to 10 circles to prepare three-di...

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Abstract

The invention discloses a preparation method of a platinum / nickel hydroxide-cobalt hydroxide / graphene three-dimensional composite catalyst, and application of the platinum / nickel hydroxide-cobalt hydroxide / graphene three-dimensional composite catalyst in a direct methanol fuel cell. A three-dimensional structured carrier including a multi-stage hole channel is constructed by utilizing the three-dimensional structure of graphene in combination with the net structure of nickel hydroxide-cobalt hydroxide; the aggregation problem of graphene is overcome to a certain degree; simultaneously, the ultra-high specific surface area and the good conductivity of graphene can make up the disadvantage that the conductivity of nickel hydroxide-cobalt hydroxide is poor; therefore, electron transfer and mass transfer in an oxidization-reduction process can be promoted; the dispersibility and the stability of catalyst particles are improved; the catalytic activity of a Pt catalyst to methanol is further increased by utilizing the catalytic performance of nickel hydroxide-cobalt hydroxide to methanol oxidation; and the use amount of the noble metal Pt is reduced. The method disclosed by the invention is simple in step, convenient to operate and high in practicability.

Description

technical field [0001] The invention belongs to the field of nanometer materials, in particular to the preparation and application of a platinum / nickel hydroxide-cobalt hydroxide / graphene three-dimensional composite catalyst. Background technique [0002] Proton exchange membrane fuel cell has become the focus of research in the field of new energy due to its economical and environmental protection and high power generation efficiency. The direct methanol fuel cell (DMFC) constructed by using methanol as the proton energy source of the proton exchange membrane fuel cell is easy to operate, has a simple cell structure, and can start quickly at low temperature. The noble metal platinum (Pt) is the most commonly used anode catalyst for DMFC, and it is the most effective catalyst for methanol electrooxidation under acidic conditions. However, the high price of Pt, low mass (area) specific activity, and easy poisoning by intermediate products such as CO in the methanol oxidation...

Claims

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Application Information

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IPC IPC(8): H01M4/90
CPCH01M4/9016Y02E60/50
Inventor 张菲菲王宗花修瑞萍龚世达鹿林夏建飞
Owner QINGDAO UNIV
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