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High-sp2 hybridization compact carbon coating layer for proton exchange membrane fuel cell bipolar plate and preparation method of high-sp2 hybridization compact carbon coating layer

A technology of proton exchange membrane and fuel cell, which is applied to battery electrodes, circuits, electrical components, etc., and can solve problems such as easy delamination and poor bonding performance of carbon membranes

Inactive Publication Date: 2014-11-05
SHANGHAI JIAOTONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the large difference in physical properties between carbon and metal materials, the deposited carbon film often has poor bonding performance and is easy to delaminate.

Method used

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  • High-sp2 hybridization compact carbon coating layer for proton exchange membrane fuel cell bipolar plate and preparation method of high-sp2 hybridization compact carbon coating layer
  • High-sp2 hybridization compact carbon coating layer for proton exchange membrane fuel cell bipolar plate and preparation method of high-sp2 hybridization compact carbon coating layer
  • High-sp2 hybridization compact carbon coating layer for proton exchange membrane fuel cell bipolar plate and preparation method of high-sp2 hybridization compact carbon coating layer

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Experimental program
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Embodiment

[0025] This embodiment is realized through the following steps:

[0026] The first step is to put the cleaned stainless steel bipolar plate into the coating equipment, and start vacuuming to make the background vacuum degree lower than 1×10 -3 Pa, start feeding argon to keep the vacuum at 1.2×10 -1 Pa.

[0027] The second step is to clean the workpiece. Use a plasma cleaning gun to clean the surface of the workpiece.

[0028] The third step is to control the bias voltage at 50V, and the carbon target current at 6A, and perform coating for 3 hours.

Embodiment 2

[0030] The first step and the second step in Example 2 are exactly the same as in Example 1, except that the current of the carbon target in Example 2 is 2A. The sample prepared in Example 2 is named S2.

Embodiment 3

[0032] The first step and the second step in Example 3 are exactly the same as in Example 1, except that the current of the carbon target in Example 3 is 5A. The sample prepared in Example 3 was named S5.

[0033] In an embodiment a bipolar plate for use in fuel cell applications is provided. It includes a metal bipolar plate on which a high sp2 hybridized dense carbon coating is deposited by ion plating.

[0034] figure 1 Scanning electron micrographs of highly sp2 hybridized dense carbon coatings deposited on stainless steel surfaces are provided. The carbon film can be prepared by various deposition methods in PVD technology. Examples of such techniques include, but are not limited to, ion plating, magnetron sputtering, and the like. The carbon film prepared by the method of material ion plating in the embodiment has dense characteristics, and the surface includes less than or equal to 5 holes / micron 2 porosity. Pores / micron 2 The porosity value is calculated by coun...

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Abstract

The invention discloses a high-sp2 hybridization compact carbon coating layer for a proton exchange membrane fuel cell bipolar plate and a preparation method of the high-sp2 hybridization compact carbon coating layer in the technical field of fuel cells. A carbon membrane coating layer which has a hydrophobic surface with the contact angle of more than 90 DEG is prepared, so that water draining and reduction in corrosion probability are facilitated; metal-doping atoms are not needed; surface activating treatment is not needed; and a microstructure is mainly in a crystalline state and has a high-sp2 bonding carbon structure. Due to the adoption of a carbon membrane which can be directly deposited on a metal surface and has high bonding force, high conductivity, high hydrophobicity and corrosion resistance, the cost of the bipolar plate can be obviously reduced.

Description

technical field [0001] The invention relates to a coating and a method in the technical field of fuel cells, in particular to a high sp2 (80%-90% content) hybrid dense carbon coating for bipolar plates of proton exchange membrane fuel cells and its preparation method. Background technique [0002] With the increasing pollution of the global environment and the depletion of petrochemical energy, finding a new energy that can replace traditional energy has become the most urgent problem facing all countries in the world. Due to its advantages of high efficiency, energy saving, safety, and environmental protection, fuel cells have attracted the attention of governments and research institutions of various countries. Among them, the proton exchange membrane fuel cell (PEMFC) uses perfluorosulfonic acid solid polymer as electrolyte, platinum / carbon or platinum-ruthenium / carbon as electrocatalyst, hydrogen or purified reformed gas as fuel, air or pure oxygen as Oxidant, a power ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/86H01M4/88
CPCY02E60/50
Inventor 蔡珣孙海林李铸国冯凯周丹华
Owner SHANGHAI JIAOTONG UNIV