Boron-doping diamond film modification-based PEMFC (Proton Exchange Membrane Fuel Cell) bipolar plate and preparation method thereof

A technology of boron-doped diamond and diamond thin film, which is applied in the field of batteries, can solve the problems of battery life and performance reduction, pollution of proton exchange membranes, increase of battery internal resistance, etc., to reduce weight and cost, high oxygen evolution overpotential, eliminate loss live effect

Inactive Publication Date: 2011-05-25
TIANJIN UNIVERSITY OF TECHNOLOGY
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  • Abstract
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Problems solved by technology

[0006] The disadvantage of stainless steel as a bipolar plate material for proton exchange membrane fuel cells is: the passive film formed naturally on the surface of stainless steel has a high resistance, which will increase the internal resistance of the battery when used as a bipolar plate; stainless steel will corrode in the PEMFC working environment. Iron ions, nickel ions, etc. pollute the proton exchange membrane, resulting in reduced battery life and performance

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  • Boron-doping diamond film modification-based PEMFC (Proton Exchange Membrane Fuel Cell) bipolar plate and preparation method thereof
  • Boron-doping diamond film modification-based PEMFC (Proton Exchange Membrane Fuel Cell) bipolar plate and preparation method thereof
  • Boron-doping diamond film modification-based PEMFC (Proton Exchange Membrane Fuel Cell) bipolar plate and preparation method thereof

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Embodiment Construction

[0042] The main steps for preparing the fuel cell bipolar plate of the present invention include the pretreatment of the substrate and the deposition of the boron-doped diamond film. The deposition device of boron-doped diamond film consists of image 3 Shown.

[0043] 1. Substrate pretreatment

[0044] (1) Mechanically polish a 40×30×0.2mm stainless steel sheet to remove the oxide layer and pollutants on the surface.

[0045] (2) Surface ultrasonic treatment: ultrasonic treatment of the substrate surface in deionized water for 30 minutes.

[0046] (3) Use magnetron sputtering to deposit TI on stainless steel, and perform annealing treatment in an inert atmosphere such as argon to release the internal stress of the titanium film and avoid the passivation of the titanium film.

[0047] (4) For the mechanical grinding treatment of emery, the diamond powder with a size of 0.25 μm is used for mechanical grinding to cause scratches and defects on the surface of the titanium film.

[0048] 2....

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Abstract

The invention discloses a boron-doping diamond film modification-based PEMFC (Proton Exchange Membrane Fuel Cell) bipolar plate and a preparation method thereof, belonging to the field of batteries. In the boron-doping diamond film modification-based PEMFC bipolar plate, after a stainless steel plate is subjected to surface pretreatment, a layer of TI film is sputtered on the stainless steel plate by using magnetron sputtering; a boron-doping diamond film is deposited on the TI film by using heat wire CVD (Chemical Vapor Deposition) equipment; and a diamond film and TI film compounded modification layer is formed on the surface of stainless steel. The stainless steel plate treated by the method has high corrosion resistance and a favorable conductive and heat-conducting property; and according to the stainless steel plate, the battery ratio power can be greatly improved and the PEMFC can achieve the aims of prolonging the service life and reducing the weight, the volume and the cost.

Description

Technical field [0001] The invention belongs to the field of batteries, and specifically relates to surface modification of stainless steel as a PEMFC bipolar plate and a preparation method thereof. Background technique [0002] A fuel cell is an electrochemical device that converts chemical energy stored in fuel and oxidizer into electrical energy efficiently and directly. It has the advantages of power generation efficiency and environmental protection. [0003] The Proton Exchange Membrane Fuel Cell (PEMFC) is converted into electrical energy through an electrochemical reaction after the combination of hydrogen and oxygen. In addition to the production of electrical energy, only water and heat generated by the reaction are produced during the process. The working principle is that hydrogen and oxygen reach the anode and cathode of the battery through the gas channel on the bipolar plate, and reach the proton exchange membrane through the diffusion layer on the electrode. Under t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/86H01M4/88
CPCY02E60/50
Inventor 朱宁申风婷曲长庆张辉戴玮多思
Owner TIANJIN UNIVERSITY OF TECHNOLOGY
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