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Pd-coated Ni0. 7Cu0. 3/NiOOH/CuO mixed crystal methanol oxidation composite electrode and preparation method thereof

A methanol oxidation and composite electrode technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of high cost, susceptibility to poisoning, poor activity and durability, and achieve low cost, short time, and improved activity and stability. Effect

Active Publication Date: 2021-07-20
CHENGDU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the above-mentioned problems in the prior art, the present invention provides a Pd@Ni0.7Cu0.3 / NiOOH / CuO mixed crystal methanol oxidation composite electrode and its preparation method, adopting an external synergistic detoxification strategy to realize a self-detoxification, self-detoxification Supplementary, highly durable and active methanol oxidation catalytic system, which effectively solves the problems of poor activity and durability, high cost and easy poisoning in the prior art

Method used

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  • Pd-coated Ni0. 7Cu0. 3/NiOOH/CuO mixed crystal methanol oxidation composite electrode and preparation method thereof

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Effect test

Embodiment 1

[0034] A Pd@Ni0.7Cu0.3 / NiOOH / CuO mixed crystal methanol oxidation composite electrode, the preparation method of which comprises the following steps:

[0035] (1) Wash the glassy carbon sheet ultrasonically at 60 Hz for 10 minutes, then place it in 0.1 g of alumina powder for mechanical polishing, then place it in the washing solution for ultrasonic washing again, and dry it in vacuum for 10 minutes to obtain a pretreated glassy carbon sheet; washing solution It is made by mixing absolute ethanol and deionized water at a volume ratio of 4:50;

[0036] (2) Configure a mixed solution of nickel chloride hexahydrate and copper nitrate trihydrate with a concentration of 0.1 mol / L, the molar ratio of nickel chloride hexahydrate and copper nitrate trihydrate is 6:3, and ultrasonically obtain solution A; configuration 0.04 The palladium chloride solution of mol / L, ultrasonication, obtains solution B; Potassium hydroxide and methanol are mixed in molar ratio 1:8, ultrasonication, obtai...

Embodiment 2

[0040] A Pd@Ni0.7Cu0.3 / NiOOH / CuO mixed crystal methanol oxidation composite electrode, the preparation method of which comprises the following steps:

[0041] (1) The glassy carbon sheet was ultrasonically washed at 60 Hz for 10 minutes, then placed in 0.1 g of alumina powder for mechanical polishing, then placed in the washing solution for ultrasonic washing again, and dried in vacuum for 15 minutes to obtain a pretreated glassy carbon sheet; washing solution It is made by mixing absolute ethanol and deionized water at a volume ratio of 5:50;

[0042] (2) Configure a mixed solution of nickel chloride hexahydrate and copper nitrate trihydrate with a concentration of 0.1 mol / L, the molar ratio of nickel chloride hexahydrate and copper nitrate trihydrate is 7:3, and ultrasonically obtain solution A; configure 0.05 The palladium chloride solution of mol / L, ultrasonic, obtains solution B; Potassium hydroxide and methanol are mixed in molar ratio 1:10, ultrasonic, obtain solution C...

Embodiment 3

[0046] A Pd@Ni0.7Cu0.3 / NiOOH / CuO mixed crystal methanol oxidation composite electrode, the preparation method of which comprises the following steps:

[0047] (1) Wash the glassy carbon sheet ultrasonically at 60 Hz for 10 minutes, then place it in 0.1 g of alumina powder for mechanical polishing, then place it in the washing solution for ultrasonic washing again, and dry it in vacuum for 20 minutes to obtain a pretreated glassy carbon sheet; washing solution It is made by mixing absolute ethanol and deionized water at a volume ratio of 6:50;

[0048] (2) Prepare a mixed solution of nickel chloride hexahydrate and copper nitrate trihydrate with a concentration of 0.1-0.2 mol / L, the molar ratio of nickel chloride hexahydrate and copper nitrate trihydrate is 8:3, and ultrasonically obtain solution A; Prepare 0.06 mol / L palladium chloride solution and ultrasonically obtain solution B; mix potassium hydroxide and methanol at a molar ratio of 1:12 and ultrasonically obtain solution...

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Abstract

The invention provides a Pd-coated Ni0. 7Cu0. 3 / NiOOH / CuO mixed crystal methanol oxidation composite electrode and a preparation method thereof, and the preparation method comprises the following steps: carrying out ultrasonic washing on a glassy carbon plate, then carrying out mechanical polishing, ultrasonic washing and vacuum drying to obtain a pretreated glassy carbon plate; preparing a solution A, a solution B and a solution C; establishing a three-electrode deposition system with the solution C as an electrolyte , adding the solution A to deposit on the surface of the pretreated glassy carbon sheet, cleaning, introducing oxygen, and loading voltage to obtain a Ni0.7Cu0.3 / NiOOH / CuO compound; and adding a solution B to deposit on the surface of the Ni0. 7Cu0. 3 / NiOOH / CuO compound, and cleaning to obtain the mixed crystal methanol oxidation composite electrode. The invention also comprises the composite electrode prepared by the method. The problems that in the prior art, activity and durability are poor, cost is high, and poisoning is prone to occurring are effectively solved.

Description

technical field [0001] The invention belongs to the technical field of composite electrodes, and in particular relates to a Pd@Ni0.7Cu0.3 / NiOOH / CuO mixed crystal methanol oxidation composite electrode and a preparation method thereof. Background technique [0002] Direct methanol fuel cells are potential energy sources for portable electronic devices and electric vehicles due to their high energy density and low pollution. Methanol can be used as a renewable high-efficiency fuel with storage and transportation safety, high power, high energy density, fast charging and low-temperature start-up of fuel cells. However, its performance faces some challenges in the process of commercialization, such as high cost, slow reaction kinetics, and catalyst poisoning by intermediate products (CO, etc.). [0003] Currently, platinum-based catalysts are considered to be the optimal catalysts for methanol oxidation. However, these catalysts have low reserves on the earth's surface, so how...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/88H01M4/86H01M4/92
CPCH01M4/8647H01M4/8657H01M4/88H01M4/8853H01M4/921Y02E60/50
Inventor 吴小强雍朝友孔清泉冯威安旭光王小炼黄林
Owner CHENGDU UNIV