2results about How to "Reduce defect concentration" patented technology

This invention belongs to the field of fuel cell technology and relates to an all-ceramic SOFC with a La-doped SrTiO3-based oxide anode and its preparation method. The fuel cell has a five-layer structure, from top to bottom: an LSTN-GDC composite anode, a first GDC barrier layer, a ScSZ electrolyte sheet, a second GDC barrier layer, and an LSCF-GDC air cathode. The LSTN-GDC composite anode is used to construct an electron-ion hybrid conductive network, modulate the coefficient of thermal expansion, and optimize the interfacial compatibility with the first GDC barrier layer. The first and second GDC barrier layers serve as chemical isolation barriers. The ScSZ electrolyte sheet provides mechanical support for the battery. The LSCF-GDC air cathode can modulate the coefficient of thermal expansion to match the second GDC barrier layer. Its beneficial effects are that the dual-sided GDC barrier layers form a good fit with the LSTN anode, ScSZ electrolyte, and LSCF cathode, further enhancing the interfacial compatibility between LSTN and the electrolyte, significantly reducing the performance degradation rate during long-term battery operation, and significantly improving durability.

A calcium titanate-based dielectric material with high energy storage performance was designed. The chemical formula of this material is Ca. 1‑x Dy x (Ti 1‑y Hf y ) 1‑x / 4 O3-z mol%M, where x=0.005~0.05, y=0.1~0.2, z=0~2, and M is MnO2 or BaCu(B2O5). It is prepared using solid-state reaction and tape casting methods. This invention, based on calcium titanate-based ceramics with high breakdown field strength, employs a series of strategies to improve energy storage performance, including element substitution, doping with sintering aids, and process improvement: partial substitution of Hf elements at the B site increases the band gap; doping with sintering aids improves grain density, both of which enhance the breakdown field strength; the addition of rare earth element Dy enhances the polarization response by introducing defect dipoles; the non-stoichiometric design reduces oxygen vacancy compensation, thereby increasing resistivity; and the tape casting method improves ceramic density and grain uniformity. The final prepared calcium titanate-based energy storage medium ceramic material exhibits good energy storage performance, with Ca... 0.995 Dy 0.005 (Ti 0.9 Hf 0.1 ) 0.99875 The best energy storage performance was achieved in O3-0.5 mol% BaCu(B2O5) ceramics, with a breakdown field strength of 101.90 kV / mm and an effective energy storage density of 10.22 J / cm³. 3 .