Preparation method for N-C-doped TiO<2> nanofiber loaded Pd@Ni positive electrode catalyst for direct methanol fuel cell

Abstract

The invention discloses a preparation method for an N-C-doped TiO<2> nanofiber loaded Pd@Ni positive electrode catalyst for a direct methanol fuel cell. The catalyst comprises the high-conductivity N-C-doped TiO<2> nanofiber and nanometer Pd@Ni with a core-shell structure, wherein the mass content of the N-C-doped TiO<2> nanofiber is 95-97%; the mass content of the nanometer Pd@Ni is 3-5%; and the ratio of n(Pd) to n(Ni) is 1:1. The catalyst provided by the invention has relatively high catalytic oxidation performance; the intermediate products of CO and the like generated by methanol oxidization are absorbed and moved to the surface of the composite catalyst, and are directly and deeply oxidized into a final product-CO<2>; the costs of Ni and Pd are far below than that of noble metals, such as Pt, Ru and the like, and the dosages of Ni and Pd are relatively low in the catalyst; and therefore, the cost of the catalyst is greatly lowered, the catalytic performance and the CO poisoning resistance of the catalyst are greatly improved.

Description

technical field [0001] The invention relates to a direct methanol fuel cell anode catalyst and a preparation method thereof. Background technique [0002] Direct methanol fuel cell (DMFC) has the advantages of low energy consumption, high energy density, abundant sources of methanol, low price, simple system, convenient operation and low noise, and is considered to be the most promising chemical power source for future automobile power and other vehicles , arousing widespread concern. One of the most critical materials of DMFC is the anode catalyst, which directly affects the performance, stability, service life and manufacturing cost of the battery. The noble metal Pt has excellent catalytic performance at low temperature (less than 80°C). At present, the anode catalysts of DMFC all use Pt as the main component, and the PtRu catalyst has stronger CO poisoning resistance and higher catalytic activity than pure Pt. It is considered to be the best catalyst for DMFC at presen...

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Problems solved by technology

The noble metal Pt has excellent catalytic performance at low temperature (less than 80°C). At present, the anode catalysts of DMFC all use Pt as the main component, and the PtRu catalyst has stronger CO poisoning resistance and higher catalytic activity than pure Pt. It is considered to be the best catalyst for DMFC at present, but due to its high price, the utilization rate in DMFC is not yet commercialized