Catalyst for negative electrode material of hydrogen-air fuel battery and preparation method thereof

Abstract

The invention discloses a catalyst for a negative electrode material of a hydrogen-air fuel battery and a preparation method thereof. In the invention, according to the catalyst, group VIII atoms anda Zn atom are coordinated together with an organic ligand to form a metal organic framework, then at least one additional group VIII atom is adsorbed by a double-solvent method, next a high-temperature pyrolysis reaction is performed in an inert gas atmosphere, the organic ligand is coordinated to form a non-metal heteroatom-doped carbon carrier, and the group VIII atoms and a non-metal heteroatomare interacted, are coated in a carbon layer and exist in a multi-atom form. Based on the metal organic framework as a precursor, the required catalyst can be prepared only by the high-temperature pyrolysis method. The preparation method is simple and feasible, and is a universal method for synthesis of multiple atoms. The group VIII multi-atom dispersed catalyst provided by the invention has good thermal stability and has excellent catalytic activity on oxygen reduction catalysis of a negative electrode of the hydrogen-air fuel battery.

Description

technical field [0001] The invention belongs to the field of hydrogen-air fuel cell technology inventions, and in particular relates to a method for preparing a VIII group polyatomic dispersed catalyst used for hydrogen-air fuel cell cathode materials. Background technique [0002] With the development of human society, issues such as global energy consumption and climate change have aroused widespread concern, so it is imminent to find alternative clean energy. Currently, new energy sources being developed include solar energy, wind energy, and fuel cells. Among them, the hydrogen-air fuel cell is a device that directly converts chemical energy into electrical energy through the electrode reaction of hydrogen and air to generate water. It does not need to be charged and does not generate exhaust gas. It is considered as the preferred clean energy power generation technology in the 21st century. However, the cathode oxygen reduction kinetics of hydrogen-air fuel cells is s...

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Problems solved by technology

[0003] Platinum carbon, as the most widely used hydrogen-air fuel cell catalyst, is not only expensive but also has poor catalyst stability. So far, the solution is to use platinum-based alloys or non-platinum catalysts instead of platinum-carbon catalysts to reduce costs and improve stability. Now the most studied non-platinum catalysts are new carbon-based nanomaterials

Many non-noble metal carbon materials such as carbon doped with nitrogen, sulfur, phosphorus, etc. have been studied as oxygen reduction catalysts for hydrogen-air fuel cells, but carbon-based polyatomic non-noble metal nanomaterials are used as cathode oxygen reduction catalysts for acidic fuel cells. has not been reported yet

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