Catalyst using metal oxide as carrier for fuel cells and application thereof

Abstract

The invention discloses a catalyst using a metal oxide as a carrier for fuel cells and application thereof. The catalyst is characterized in that: the metal oxide as the carrier has catalytic oxygen evolution function simultaneously, and a noble metal with catalytic oxygen reduction function is supported on the metal oxide; the nanoparticles of the noble metal are highly dispersed on the surface of the metal oxide as the carrier, wherein the mass fraction of the noble metal is 2 to 70 percent in the catalyst. The catalyst alone or the catalyst mixed with platinum black in a certain proportion is applied to bifunctional oxygen electrodes for utilized regenerative fuel cells. Compared with the traditional mechanical mixture of platinum black and an oxide from catalytic oxygen evolution reaction, the fuel cell and water electrolysis performances of the cells are greatly improved, and the performance is close to that of a commercial Pt / C catalyst in fuel cells. The catalyst is applied to fuel cell oxygen electrodes to effectively solve the problems that the activity of the catalyst is deceased by the corrosion of the carrier.

Description

technical field [0001] The invention relates to an energy storage battery, in particular to a catalyst for an integrated renewable fuel cell double-effect oxygen electrode. Background technique [0002] Space technology has a profound impact on the country's comprehensive strength and international status, so the research and development of space technology has been highly valued by countries all over the world. A highly safe and reliable energy system is an important factor to ensure the normal operation of space vehicles such as space stations and satellites. At present, solar cells are used as the main power source of the spacecraft, and space renewable energy is used as the energy storage system to provide the energy needs of the spacecraft in the dark state. [0003] Scientists have conducted a comparative study of various existing technical solutions that can be used in space renewable energy systems, and believe that compared with Li ion, Ni / MHx, Ni / Cd and other rech...

AI Technical Summary

Problems solved by technology

Since the catalysts used are all non-supported catalysts, both the oxygen reduction catalyst and the oxygen evolution catalyst exist in the form of aggregates at the microscopic level, and the ordinary ultrasonic vibration method cannot fully disperse the aggregates. Mixing can only be achieved at the aggregate level

In this way, the single-function oxygen reduction catalyst and oxygen evolution catalyst are discontinuously distributed in the catalytic layer space. For any catalyst, it cannot fully occupy the entire catalytic layer space, thereby reducing the utilization rate of the catalyst.

At the same time, when oxides are used as oxygen evolution catalysts, the inhomogeneous mixing of catalysts also increases the internal resistance of the entire catalytic layer due to its poor electrical conductivity compared to Pt.

The existence of the above problems reduces the performance of URFC fuel cells and water electrolysis

Images