Stability and activity controls of Cu nanoparticles for high-performance solid oxide fuel cells

Electrochemical Activation Applied to Perovskite Titanate Fibers to Yield Supported Alloy Nanoparticles for Electrocatalytic Application

“…This middle frequency range between 10-100 Hz indicates that gas adsorption, desorption, and dissociation or surface diffusion and ionic charge transfer are the dominated process in the cells. [38,39] The R s of the La 0.52 Ca 0.28 Ni 0.03 Co 0.03 Ti 0.94 O 3 fiber based cell increased slightly after switching at 1.8 V but reduced when increasing the voltages to 2.0 and 2.1 V. Similar trends can be seen for the R p value which indicates the electrode is well activated at this high voltage. The R s value after switching remains identical to the one before switching for cells with La 0.52 Ca 0.28 Ni 0.04 Fe 0.04 Ti 0.92 O 3 electrodes.…”

Interfacial electron transfer in heterojunction nanofibers for highly efficient oxygen evolution reaction

“…Compared to the conventional infiltration method, in situ exsolution could offer a simpler process, smaller particle size, higher catalytic activity, and more excellent stability because the exsolved nanoparticles are better socketed into the perovskite oxide surface. 22,23 For example, John T. S. Irvine and co-workers developed a well-designed heterogeneous electrocatalyst by in situ growth of Ni nanoparticles to enhance the OER activity. 24 Not only can these exsolved nanoparticles increase the electrochemically active sites, but also the synergistic interactions with the substrate can improve the stability of the catalysts.…”

Co-improving the electrocatalytic performance and H2S tolerance of a Sr2Fe1.5Mo0.5O6−δ based anode for solid oxide fuel cells

“…18,19 Oxygen vacancies play an important role in fuel oxidation, including oxygen ion migration, adsorptive activation of fuel molecules and enhanced oxidation of H 2 S. Transition metal elements, such as Ni, Co,Cu and Mn, are normally doped into the B-site of host Fe-based perovskite to construct oxygen vacancies. [20][21][22][23] For example, the replacement of Fe with Co forms Sr 1.95 Fe 1.4 Co 0.1 -Mo 0.5 O 6Àd , increasing the concentration of oxygen vacancies and rendering a peak power density of 1.01 W cm À2 at 750 C. 24 Furthermore, Co can replace Fe and Mo to form a perovskite material (Sr 2 Co 0.4 Fe 1.2 Mo 0.4 O 6Àd ) in the air atmosphere. However, Sr 2 Co 0.4 Fe 1.2 Mo 0.4 O 6Àd is unstable under anodic atmosphere and transforms into a Ruddlesden-Popper structured Sr 3 Co 0.1 Fe 1.3 Mo 0.6 O 7Àd oxide with the release of CoFe nanoparticles.…”