Preparation method of amorphous C-N thin film electrocatalyst

Abstract

The invention relates to a preparation method of an amorphous C-N thin film electrocatalyst. The method comprises the following steps of: applying bias voltage on a substrate, depositing an amorphous C-N thin film on a titanium base, wherein the corresponding flow ratio of carbon source air, argon and nitrogen in the reaction process is 25 to 20 to15, and the unit refers to milliliter / per minute at a standard state; performing heat treatment at 700 DEG C on the deposited thin film by using a high-vacuum heat treatment furnace, thus realizing the preparation of the C-N thin film catalyst. The method is simple in preparation, has low cost and can not introduce metal impurities. For the prepared C-N catalyst, the starting potential is -0.02V, the limit current density is 5.46mA / cm<-2>, the specific current can keep 98% in a chronoamperometry test lasting for 18000 seconds, and the methanol poisoning can not be caused. The catalytic activity of the catalyst prepared by the method disclosed by the invention is comparable with that of a Pt / C catalyst, while the stability and the selectivity are better than those of the Pt / C catalyst, the catalyst is a non-noble metal catalyst with an excellent property.

Description

technical field [0001] The invention relates to a preparation method of an amorphous C-N thin film electrocatalyst material. It specifically involves the preparation of amorphous C-N thin films on titanium substrates by RF magnetron sputtering with substrate bias, and heat treatment of the films at 700°C to obtain C-N thin film electrocatalysts, which can be used to replace expensive Pt-based catalysts for Accelerates the oxygen reduction reaction at the fuel cell cathode. Background technique [0002] Energy is the foundation of economic development, without the development of the energy industry there would be no modern civilization. After several revolutionary industrial changes, people are looking for more efficient and environmentally friendly ways to use energy while developing the energy industry, so fuel cell technology has emerged. A fuel cell is a power-generating battery that converts chemical energy in fuel into electrical energy. Since the British Grove inven...

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Problems solved by technology

The preparation methods of these nitrogen-doped carbon-based materials are mainly concentrated on high-temperature pyrolysis and chemical vapor deposition. to generate graphene and carbon nanotubes, and then dissolve and remove the metals with an acid solution

The problem with this material is that ① it is difficult to judge whether the final catalytic activity comes from the nitrogen-doped carbon-based material or the residual metal impurities; ② it is likely to protonate the active site pyridinic nitrogen into the inactive pyridinic nitrogen during the process of dissolving the metal. -hydrogen

At present, there is no report on the preparation of amorphous C-N thin film electrocatalysts by RF magnetron sputtering with substrate bias. This method is simple to operate, low in cost, and does not introduce any metal impurities during the entire preparation process. The test results show that its catalytic activity, stability and selectivity are comparable to those of Pt / C electrocatalysts

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