Development of Highly Nano-Dispersed NiO/GDC Catalysts from Ion Exchange Resin Templates

Abstract

Novel NiO/GDC (Gadolinium-doped Ceria) cermet catalysts were developed by the Weak Acid Resin (WAR) method using an ion exchange resin template. In addition, the specific surface area of these tunable materials was enhanced by NiO partial dissolution in aqueous acid solution. The whole procedure highly improved the micro-structural properties of these materials compared to previous studies. Catalysts with high metal loadings (≥10%), small Ni nanoparticles (<10 nm), and high specific surface areas (>70 m 2 /g) were achieved. These properties are promising for catalytic applications such as methane steam reforming for H 2 production.

Understanding the Coarsening and Degradation in a Nanoscale Nickel Gadolinia-Doped-Ceria Electrode for High-Temperature Applications

“…The actual NiO and CGO primary particles after calcination (see Supporting Information Note S1 for detailed thermal analysis) and milling remained a few 10 nm in diameter as shown in Figure a, but the particles formed loose nanocomposite agglomerates as seen in Figure b, which were captured by laser scattering, as shown in Figure S1a, as the micrometer-scale “secondary particles”. The total specific surface area of the calcined and milled powder was calculated from the isotherms (see Supporting Information Figure S1b) by the Brunauer–Emmett–Teller theory to be 111 m 2 g –1 , which is higher than that of commercial powders (typically 10 m 2 g –1 ) and other high-surface area Ni-CGO powders. ,, …”

“…The total specific surface area of the calcined and milled powder was calculated from the isotherms (see Supporting Information Figure S1b) by the Brunauer−Emmett−Teller theory to be 111 m 2 g −1 , which is higher than that of commercial powders (typically 10 m 2 g −1 ) and other high-surface area Ni-CGO powders. 17,22,23 The Ni content in the electrode material was measured as 28.8 wt % by the mass change of a sintered pellet after reducing NiO to Ni (ignoring any mass changes in the CGO).…”

Development of a processing map for safe flash sintering of gadolinium‐doped ceria

“…It has remarkable redox and oxygen storage capability (OSC) 2 . Thus, it is used as a catalyst, or as a catalyst support for chemical processing [3][4][5] . It also possesses high ionic conductivity between 500 to 600 °C 6,7 , which makes it a strong candidate for electrochemical devices like oxygen sensors 8,9 , oxygen transport membranes 10,11 , cermet electrodes [12][13][14] and electrolytes for solid oxide fuel and electrolysis cells (SOFC/SOECs) 6,7,15,16 .…”