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A partial charge is a non-integer charge value when measured in elementary charge units. Partial charge is more commonly called net atomic charge. It is represented by the Greek lowercase letter δ, namely δ− or δ+.
A Ga-Mn dual-doped pyrochlore-type La2Zr2O7 low-temperature ceramic electrolyte and fuel cell
This invention discloses a Ga-Mn dual-doped pyrochlore-type La₂Zr₂O₇ low-temperature ceramic electrolyte and a fuel cell. The low-temperature ceramic electrolyte has a single-phase pyrochlore structure and the chemical formula La. 2‑ x Ga x Zr 2‑x Mn x O 7‑δ Where 0.2≤x≤0.6; Ga is Ga 3+ The form replaces part of the La bit, Mn with Mn 2+ / Mn 3+ / Mn 4+ By substituting some Zr sites, co-doping induces oxygen vacancy enrichment and modulates local charge distribution, thereby promoting oxide ion transport. The optimized composition of this invention, La... 1.6 Ga 0.4 Zr 1.6 Mn 0.4 O 7‑δ The ionic conductivity reaches 0.28 S·cm at 550 °C. ‑1 The activation energy was reduced to 0.678 eV; a single cell constructed using this electrolyte achieved 1171 mW·cm⁻¹ at 550 °C. ‑2 The peak power density is reduced to 0.37 Ω; the present invention realizes rapid oxide ion transport of La2Zr2O7-based electrolyte under medium and low temperature conditions, which can be used in high-performance solid oxide fuel cells.
Owner:NANJING XIAOZHUANG UNIV