Fabrication of High-performance Ni-GDC-nanocube Core-shell Anodes Prepared by a Chemical Reduction Method for Low-temperature Solid-oxide Fuel Cells

摘要

High-performance attractive SOFC anode material Ni-GDC-nanocube core-shell composites were successfully fabricated in a solution by chemical reduction method. The novel anode material was composed of a spherical metal Ni core and a covering GDC nanocube shell. 200 nm size of large Ni spheres provided great porous and Ni-Ni necking framework for current collection as macros tructure. On the surface of Ni spheres, 10 nm size of GDC nanocube particles covered with highly reactive {001} crystal facets acquired enlarged triple-phase boundary (TPB) as microstructure. In situ fabrication of Ni-Ni necking framework was achieved by crystal growth of Ni spheres during generation tests even at 500 ℃ operating. The non-sintered Ni-GDC-nanocube core-shell anode showed a higher power density compared with conventional Ni-GDC anodes sintered at 1300 ℃. The designated macro- and microstructure of Ni-GDC-nanocube core-shell anodes were maintained after generation tests even at 700 ℃ operating.