Reduction kinetics of NiO–YSZ composite for application in solid oxide fuel cell

Synthesis of Flake‐Shaped NiO–YSZ Particles for High‐Porosity Anode of Solid Oxide Fuel Cell

“…In terms of primary crystallite sizes, as-synthesized NiO-YSZ is comparable to those synthesized by other solution-based methods. [16][17][18] Our results showed that the effective doping of Y 2 O 3 into ZrO 2 lattice was achieved, accompanied by the formation of crystalline NiO phase. The nitrogen adsorption experiments indicate that the BET surface area of as-synthesized NiO-YSZ is 11.5 m 2 /g, which is slightly larger than…”

“…The average crystallite sizes of NiO and YSZ in as‐synthesized NiO–YSZ were 28.7 and 15.4 nm, respectively. In terms of primary crystallite sizes, as‐synthesized NiO–YSZ is comparable to those synthesized by other solution‐based methods . Our results showed that the effective doping of Y 2 O 3 into ZrO 2 lattice was achieved, accompanied by the formation of crystalline NiO phase.…”

“…Three disks made from NiO–YSZ powders synthesized in this study are more porous, and more uniform in chemical composition than that prepared from commercial NiO–YSZ (porous grains are Ni). In our study, polymer hydrogel networks and chelating sucrose were used in the synthesis of flake‐shaped particles with uniform dispersion of NiO and YSZ, which were similar to those matrix‐type particles reported . An increase of the TPB area would be expected from high porosity and fine dispersion of Ni and YSZ in the anode, thus leading to improved cell performance …”

“…The resultant composite NiO–YSZ powders exhibited very good interconnectivity of NiO and YSZ grains . Despite many synthesis methods, including co‐precipitation process, sol–gel process and hydrothermal process, and combustion synthesis, have been developed to prepare ceramic powders with different particle sizes, our approach of using the sugar dehydration reaction has not been reported so far . Furthermore, the anode fabricated from flake‐shaped particles would have a high porosity and good pore–channel interconnectivity because of random packing of these particles.…”

Electrochemical characteristics and performance of anode-supported SOFCs fabricated using carbon microspheres as a pore-former

“…To increase the anode performance in SOFCs, an optimal porosity is required to provide sufficient gas permeability, suitable electrical conductivity, good mechanical strength, high electrochemical catalytic activity, low ohmic resistance and activation polarization, as well as good compatibility with other fuel-cell components [9,15e17]. Although most of NiO/YSZ anodes contain some degree of porosity that is often increased after the in-situ reduction of NiO to Ni, its final porosity is not usually high enough to achieve sufficient gas diffusion rate and active surface area required in the anode structure [11,16,18]. Adding a certain amount of pore-forming agent (pore-former) such as carbon micro-spheres (CMS) to ceramic powder is an effective method to improve the microstructure with desired porosity and pore-size distribution [11,16,19].…”