Composite electrode for medium and low temperature proton conductor solid oxide cell and preparation

Abstract

The invention belongs to the technical field of fuel cells and electrolytic cells, and discloses a composite electrode for medium and low temperature proton conductor solid oxide cell and a preparation method of the composite electrode. According to the composite electrode for the medium and low temperature proton conductor solid oxide cell, a proton conductor oxide of an A-site defect is heated and reduced in a hydrogen atmosphere; nanometal particles are obtained through in-situ growth on the proton conductor oxide; and the nanometal particles and the proton conductor oxide form the composite electrode. The composite electrode for the medium and low temperature proton conductor solid oxide cell has excellent thermal stability and catalytic activity, can be applied to a solid oxide fuel cell or a solid oxide electrolysis cell, has a relatively low operation temperature, and has actual application value. The nanometal particles in the electrode can be prepared in situ under the condition of a reducing atmosphere, and can go back to crystal lattices of the proton conductor oxide under the condition of an oxidizing atmosphere, so that a nanometal particle catalyst in the electrode is renewable to a certain extent.

Description

technical field [0001] The invention belongs to the technical field of fuel cells and electrolytic cells, in particular to a composite electrode for a medium-low temperature proton conductor solid oxide cell and a preparation method thereof. Background technique [0002] Solid oxide cells (SOCs) can be divided into solid oxide fuel cells (SOFCs), which convert chemical energy into electrical energy, and solid oxide electrolytic cells (SOECs), which use electrical energy to generate fuel, according to the application direction. Reversible solid oxide cells (R-SOCs) adopt the same basic structure, and can use SOFCs or SOECs modes according to different operating conditions and requirements. [0003] BaCeO 3 , SrCeO 3 , BaZrO 3 , SrZrO 3 The host perovskite proton conductor has been widely used in the electrolyte of SOFCs. Since the mobility of protons is greater than that of oxygen ions, SOCs with proton conductors as electrolytes are more suitable for operation at medium...

AI Technical Summary

Problems solved by technology

[0004] The metal (nickel) and electrolyte composite electrode prepared by the first method requires high-temperature calcination, resulting in particle size in the micron scale, so the activity is poor; the metal catalyst of the composite electrode prepared by the second method is generally nanoscale, and the activity Higher, but because there is no force between the metal nanoparticles and the electrolyte and the surface energy of the nanostructured catalyst is large, the nanoparticles will gradually coarsen and the activity will decrease during the operation of the battery

Images