Zr‐ and Tb‐doped barium cerate‐based cermet membrane for hydrogen separation application

Abstract

Ba 0.8 Ce 0.35 Zr 0.5 Tb 0.15 O 3-d (BCZT) perovskite has been synthesized by glycineassisted solution combustion method. The Ni-Ba 0.8 Ce 0.35 Zr 0.5 Tb 0.15 O 3-d -based cermet membrane is obtained by cosintering NiO and BCZT powder mixture at 1550°C in reducing atmosphere. The X-ray diffraction pattern of sintered pellet shows the characteristic peaks of both Ni and BCZT phases. FESEM image and elemental mapping confirm the presence of randomly distributed metallic nickel in the BCZT matrix. An electrical conductivity of~14 S/cm at 700°C is achieved in Ni-BCZT membrane, which reduced further with increase in temperature (>700°C). The cermet membrane (1.5 mm thick) shows a highest hydrogen permeation flux of~0.07 mL/min/cm 2 at 900°C. Chemical stability of Ni-BCZT membrane has also been examined under humid and carbon dioxide containing atmosphere. The membrane shows good structural stability without any significant change in hydrogen permeation flux. K E Y W O R D S ceramic-metal systems, fuel cells, membranes, permeability, perovskites

Tuning the two phases ratio by nonmetal ion doping in dual‐phase mixed‐conductive ceramic membranes

“…[19][20][21] Up to now, perovskite-type oxides have been the most widely investigated MPEC materials with the chemical formula of ABO 3 , which possess high protonic conductivity. [22][23][24] However, the H 2 permeation fluxes of these MPEC membranes are extremely low due to their poor electronic conductivity, even at high temperatures. [25][26][27] For example, Cai et permeation flux of 0.017 mL min −1 cm −2 .…”

The Exsolution of Cu Particles from Doped Barium Cerate Zirconate via Barium Cuprate Intermediate Phases

“…The enhanced performance may come from the change of the acid-base properties of the catalysts, the dispersion of nanoparticles, and the interaction between the active particles and support. [18] Since proton conduction in perovskite oxides was firstly discovered by Iwahara in 1981, [19] it has opened new opportunities for electrochemical devices, such as chemical sensors, hydrogen separation, [20][21][22] hydrogenation and dehydrogenation of organic compounds, [23] electroliers, and solid oxide fuel cells. [24][25][26][27][28][29] Particularly renowned in the fields of electrolysis and fuel cells, the great potential of proton conductors is due to the possibility of lowering their operating temperatures (<600 °C).…”