Nanocomposite Catalyst for High-Performance and Durable Intermediate-Temperature Methane-Fueled Metal-Supported Solid Oxide Fuel Cells

Abstract

CH 4 -fueled metal-supported solid oxide fuel cells (CH 4 -MS-SOFCs) are propitious as CH 4 is low-priced and readily available, and its renewable production is possible, such as biomethane. However, the current CH 4 -MS-SOFCs suffer from either poor power density or short durable operation, which is ascribed to the low catalytic activity and poor coking tolerance of the metallic anode support. Herein, we have deliberately designed and synthesized a highly active nanocomposite catalyst, Sm-doped CeO 2supported Ni, as the internal steam methane reforming catalyst, to optimize CH 4 -MS-SOFCs. Both power densities and durability of optimized CH 4 -MS-SOFCs have been dramatically enhanced compared to the pristine CH 4 -MS-SOFCs. The optimized CH 4 -MS-SOFCs deliver the highest performances among all zirconia-based CH 4 -MS-SOFCs. Furthermore, the operating temperature has been reduced to 600 °C. At 600 °C, a viable peak power density of >350 mW/cm 2 is achieved, which is more than three times as high as the pristine CH 4 -MS-SOFCs. Furthermore, the optimized CH 4 -MS-SOFC achieves >1000 h of stable operation.

Synergistic Effects of In-Situ Exsolved Ni–Ru Bimetallic Catalyst on High-Performance and Durable Direct-Methane Solid Oxide Fuel Cells

“…It has been recognized that the oxide-based catalyst support with a high oxygen vacancy concentration could promote the dissociative adsorption of H 2 O . The characteristic redox couple Ce 4+ /Ce 3+ in CeO 2 enables a high oxygen storage capacity; thus, it has been widely employed as the support of various catalysts for CO 2 hydrogenation, SMR, and DRM. , Therefore, engineering CeO 2 to further increase the oxygen vacancy concentration could potentially promote SMR. Sm-doped CeO 2 (SDC) displays the smallest enthalpy of association between the dopant cations and oxygen vacancies in the fluorite lattice .…”

Boosting the performance of reversible solid oxide electrochemical cells with a novel hybrid oxygen electrode, Pr1.39Ba0.14Sr0.53Co1.48Fe0.76O6−δ-Ba0.66Sr0.34CoO3−δ

“…In fuel cell mode, SOECs convert fuels such as hydrogen and hydrocarbons into electricity with a higher efficiency than combustors. 2 When there is excess electricity available, SOECs function as electrolyzers to produce hydrogen, carbon monoxide or syngas with different reactants fed to the fuel electrode. [3][4][5][6][7] SOEC technology has undergone drastic improvements over the past decade, but for its commercialization, further research and development are needed to increase the performance (i.e., energy efficiency and durability) at reduced operating temperatures.…”

Stability of the Structural and Transport Characteristics of (ZrO2)0.99−x(Sc2O3)x(R2O3)0.01 (R–Yb, Y, Tb, Gd) Electrolytic Membranes to High-Temperature Exposure

“…However, this material is subject to degradation of the electrical conductivity during long-term operation at high operating temperatures. To increase the stability of the structure and transport characteristics, additional codoping oxides are introduced into the composition of ZrO 2 -Sc 2 O 3 solid solutions [ 10 , 11 , 12 , 13 , 14 , 15 ].…”