Solid-state potentiometric CO2 sensor based on Li22co3-MgO electrolyte

Abstract

Abstract.A type II solid state electrochemical CO, sensor was investigated using a two-phase mixture of Li2CO 3 and MgO as solid electrolyte and LiMn204 as reference electrode. The electromotive force of the galvanic cell, the reproducibility and the long-term stability of the sensor signal were examined under dry and humid conditions in the temperature range between 300 and 400 ~ The emf dependence on the partial pressure of COz follows a Nernstian type equation. The sensitivity to CO2 is affected by water vapor, but a logarithmic relationship of the emf on the CO2 partial pressure is also observed for humid gases. The cell shows long-term stability and good reproducibility of the sensor signal.

NMR Investigations in Li1.3Al0.3Ti1.7(PO4)3 Ceramics. Part I: Structural Aspect

“…Solid electrolytes with fast Li + ion transport are attractive materials for applications in CO 2 gas sensors and solid electrolyte batteries . In particular, lithium compounds with NASICON (Natrium Super ionic conductor) structure, formula LiM 2 (PO 4 ) 3 , have been extensively studied. − It has been shown that the bulk ionic conductivity of LiTi 2 (PO 4 ) 3 , σ b = 1.5 × 10 –4 S·m –1 at room temperature, increases by several orders of magnitude if Ti 4+ is partially substituted by Al 3+ , Sc 3+ , Fe 3+ , or Y 3+ ions. − The bulk ionic conductivity at 298 K for Li 1.3 Al 0.3 Ti 1.7 (PO 4 ) 3 (LATP) was found to be 10 –1 S·m –1 with the activation energy E b = 0.25 eV for the bulk and E gb = 0.29 eV for the brain boundary. − The Li + ion transport number in these compounds was found to be t L i = 1. , In such samples, the large enhancement of the conductivity cannot be only explained by the increase of the lithium content of the compound.…”

“…Solid electrolytes with fast Li + ion transport are attractive materials for applications in CO 2 gas sensors 1 and solid electrolyte batteries. 2 In particular, lithium compounds with NASICON (Natrium Super ionic conductor) structure, formula LiM 2 (PO 4 ) 3 , have been extensively studied.…”

NMR Investigations in Li1.3Al0.3Ti1.7(PO4)3 Ceramics Part II: Lithium Dynamics, Experiments, and Model

“…Li 1.3 Al 0.3 Ti 1.7 (PO 4 ) 3 belongs to the rhombohedral symmetry (space group R 3̅ c , Z = 6) which is typical for NASICON (natrium superionic conductor) structure. The lattice parameters of Li 1.3 Al 0.3 Ti 1.7 (PO 4 ) 3 are a = 8.5098 Å and c = 20.8305 Å. − …”

NMR Investigations in Li1.3Al0.3Ti1.7(PO4)3 Ceramics Part III: Local Dynamical Aspect Seen from Aluminum and Phosphorus Sites

“…Li 1.3 Al 0.3 Ti 1.7 (PO 4 ) 3 has rhombohedral symmetry (space group R 3̅ c , Z = 6), which is typical for NASICON structure. The lattice parameters of Li 1.3 Al 0.3 Ti 1.7 (PO 4 ) 3 are a = 8.504 Å and c = 20.881 Å. − Let us recall the main results obtained in part I (apart from the synthesis). (i) In the case of 27 Al, both magic-angle spinning (MAS) and static modes give evidence of a single site with disorder.…”