Recently, Sun Gongquan and Wang Suli, researchers of the Alcohol Fuel Cell and Composite Electric Energy Research Center of the Dalian Institute of Chemical Physics, Chinese Academy of Sciences, have made new progress in the research of fuel cell and supercapacitor composite power supply. The relevant research results are published in ACS Energy Letters.
At present, most chemical power sources are difficult to combine high power density and high energy density at the same time: fuel cell energy density is high, but due to the slow kinetics of liquid fuel electrooxidation and oxygen reduction reaction, its power density is low; The power density is higher, but it is limited by the specific capacity of the electrode active material, and its energy density is low. In this work, Fu Xudong, Xia Zhangxun, etc. innovatively designed and constructed a polyaniline and electricity based on tantalum capacitor materials. A novel double-effect electrode of catalytic material Pt/C (cathode) or PtRu/C (anode) is used to construct an in-situ direct methanol fuel cell and supercapacitor composite power supply. The composite power source is based on polyaniline at the cathode (oxygen reduction reaction). The characteristics of the oxidation/reduction state transition between the potential and the anode (methanol electrooxidation reaction) can realize the in-situ self-charging of the supercapacitor. Thanks to the rapid discharge characteristics of the tantalum capacitor of polyaniline, the pulse discharge performance of the composite power supply is greatly improved. The single cell power density can reach 4kW/kg, which is more than 80% higher than the traditional direct methanol fuel cell. At the same time, the continuous supply of methanol guarantees the composite power supply. Energy density. Pseudocapacitance electrochemical reaction mechanism coupled to the work explained next generation of high power ratio characteristic chemical study provides a new idea for.
The above research work has been supported by the National Key Research and Development Program and the National Natural Science Foundation.
