High-performance electrodes for reversible solid oxide fuel cell/solid oxide electrolysis cell: Ni–Co dispersed ceria hydrogen electrodes

Abstract

Within the framework of developing reversible solid oxide fuel cells/solid oxide electrolysis cells (SOFCs/ SOECs), we have engaged in the design of high-performance electrodes. Facile production of hollow spherical particles of samaria-doped ceria (SDC) decorated with Ni-Co alloy catalysts (Ni 100ÀX Co X /SDC, X ¼ 0-50 atom%), nanometers in size, was adopted. A distinctive microstructure was observed in the hydrogen electrode fabricated with this composite powder. The cobalt addition played a significant role in evolution of the microstructure and effectively enlarged the electrochemical reaction zone. Under SOFC/SOEC reversible operation, the optimal performance characterized by a comparatively low ohmic resistance and high electrocatalytic activity was achieved with the Ni 80 Co 20 /SDC composition. At 900 C and an overpotential of 0.1 V, the current density reached remarkably high values of 0.18 and 0.37 A cm À2 in SOFC and SOEC operation, respectively.

Determination with a Genetic Algorithm of Reactant Coverages on H2/H2O Electrodes Based on Electrochemical Kinetics Under Reversible SOFC/EC Operation▴

“…In this region, i was approximately linear to P H2O 0.60∼0.75 and slightly depended on P H2 . The maximum i in the EC mode region was not high compared to that reported in the literature obtained at P H2O > 0.9 A cm −2 42–44, because range of P H2O was 0.01–0.05 in this present study.…”

Tensile mechanical performance of Ni–Co alloy nanowires by molecular dynamics simulation

“…In recent years, with the improvement of material preparation technology and the change of material application requirements, the performance of single pure metal Ni and Co cannot meet the service requirements of materials in harsh environments. At present, because of its high hardness, good wear resistance, corrosion resistance, high temperature resistance and magnetism, [1][2][3][4][5] Ni-Co alloy has received extensive attention in a variety of elds with regards to coating materials, magnetic materials and absorbing materials. The main methods for the preparation of Ni-Co alloy include co-deposition, 6 electrodeposition, 7 template method, 8,9 liquid phase reduction method, 10 sol-gel method, 11 et al The products with excellent performance are mainly obtained by adjusting the composition ratio and changing the experimental conditions.…”

Research and Development of Highly Active and Durable Electrocatalysts Based on Multilateral Analyses of Fuel Cell Reactions

“…It was found that the Ni or Ni-Co NPs played a highly active role in the hydrogen oxidation/evolution reactions. [91][92][93][94][95]98 The activity of the hydrogen electrode in the SOEC was found to increase with an increase in the ionic conductivity Q ion of the zirconia electrolyte, 95 similar to the case of SOFC electrodes: 78,81,84,86 the use of high-performance electrodes in combination with the a solid electrolyte having high Q ion is essential to achieve high performance R-SOCs.…”