18650 rechargeable battery lithium 3.7v 3500mah

　　Exploring three-dimensional graphene platinum catalysts for 18650 rechargeable battery lithium 3.7v 3500mah research

　　Recently, Wang Qi's research group at the Applied Plasma Laboratory of the Institute of Plasma Physics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, has made progress in methanol oxidation reaction, and the relevant content has been published in Applied Surface Science.

　　The working principle of direct methanol 18650 rechargeable battery lithium 3.7v 3500mah (DMFC) is that during the redox reaction, the methanol at the anode loses electrons under the action of the catalyst and passes through the external circuit to the cathode. At the same time, hydrogen ions (acidic electrolyte) are transferred from the anode to the cathode through the electrolyte membrane, and then the oxygen at the cathode is catalytically reduced to obtain electrons to form a current loop and provide electrical energy. Among them, the catalyst is crucial to the methanol oxidation reaction at the anode. In recent years, related research has become more and more in-depth, mainly starting from improving the utilization rate of precious metal catalysts, modifying carriers and preparing alloy catalysts to improve anti-poisoning ability. Platinum (Pt) has always attracted the attention of researchers as a precious metal catalyst with excellent performance. Among them, the carrier loaded with platinum nanoparticles often has a greater impact on the final catalytic performance. Graphene oxide is often used as a carrier for precious metals. However, the electrochemical performance test does not achieve the desired effect when graphene oxide is used directly as a carrier.

　　The researchers self-assembled graphene oxide (GO) and carbon nanotubes (CNTs) to form a three-dimensional structure, then loaded platinum, and obtained a platinum-based three-dimensional graphene-carbon nanotube catalyst (Pt/GNTs) with a large specific surface area through hydrogen plasma discharge, which has excellent methanol oxidation catalytic performance. This technical route combines the advantages of GO and CNTs to form a three-dimensional composite structure through self-assembly, which increases the specific surface area and is more conducive to the distribution of platinum nanoparticles. Subsequently, researchers prepared a series of catalysts with different GO and CNTs mass ratios (GO:CNTs=0:1, 1:6, 1:4, 1:2, 1:1, 2:1, 4:1, 6:1 and 1:0) in the experiment. The results showed that GO:CNTs=1:2 had the best catalytic performance for methanol, with a current density of up to 691.1mA/mg, which was 87.7% higher than the performance of commercial platinum-carbon catalysts and better than most other reported catalysts. After 3600s of CA testing, it still maintained a high current density. This study is of great significance for the preparation of efficient methanol oxidation catalysts, and also provides a new idea for the preparation of three-dimensional graphene carriers.

　　This research work was supported by the National Natural Science Foundation of China, the Outstanding Youth Science Fund of Anhui Province, the Talent Project of the Youth Promotion Association of the Chinese Academy of Sciences, and the President Fund of the Hefei Institute of Technology.

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