The rational design and exploration of the metal oxide-carbon composite are greatly desired for enhanced supercapacitor application. Herein, we develop a novel Bi 2 MoO 6 and carbon sphere hybrid material as a supercapacitor electrode via a simple solvothermal process. The microstructural analysis of the carbon sphere@Bi 2 MoO 6 reveals that the 10 nm thick Bi 2 MoO 6 nanopetals are consistently anchored on the carbon spheres surface, forming a 3-dimensional nanoarchitecture. The carbon sphere@Bi 2 MoO 6 electrode displays an excellent specific capacitance of 521.42 F g −1 at 1 A g −1 , which is one of the best values of any reported Bi 2 MoO 6 -based electrodes to date. Moreover, this hybrid electrode can accumulate total charge as high as 2083 C g −1 , which is consistent with high capacitance. The all-solid-state symmetric supercapacitor device exhibited the specific capacitance of 26.69 F g −1 , along with ∼80% of capacitance retention after 10000 cycles. The superior supercapacitor performance of the carbon sphere@Bi 2 MoO 6 electrode is primarily due to the hierarchical nanoarchitecture of Bi 2 MoO 6 , its promotion of redox reactions, and the presence of highly conductive carbon spheres at cores, which provides pathways for rapid electron transfer. These results highlight feasibility of the carbon sphere@Bi 2 MoO 6 hybrid material as a highly propitious electrode for supercapacitor applications.

A functionally graded BiErO (ESB)/YZrO (YSZ) bilayer electrolyte is successfully developed via a cost-effective screen printing process using nanoscale ESB powders on the tape-cast NiO-YSZ anode support. Because of the highly enhanced oxygen incorporation process at the cathode/electrolyte interface, a novel bilayer solid oxide fuel cell (SOFC) yields extremely high power density of ∼2.1 W cm at 700 °C, which is a 2.4 times increase compared to that of the YSZ single electrolyte SOFC.

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Highly conductive Dy and Y co-doped bismuth oxides combined with La0.8Sr0.2MnO3−δ significantly enhanced the ORR and OER as oxygen electrodes for reversible SOCs.

Herein, we developed a Mn1.3Co1.3Cu0.4O4 (MCCO) spinel for use as a new ORR catalyst for intermediate temperature solid oxide fuel cell (SOFC) applications.

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Composite cathodes comprising nanoscale powders are expected to impart with high specific surface area and triple phase boundary (TPB) density, which will lead to better performance. However, uniformly mixing nanosized heterophase powders remains a challenge due to their high surface energy and thus ease with which they agglomerate into their individual phases during the mixing and sintering processes. In this study, we successfully synthesized La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3−δ (LSCF)−Gd 0.1 Ce 0.9 O 1.95 (GDC) composite cathode nanoscale powders via an in situ sol−gel process. High-angle annular dark field scanning transmission electron microscopy analysis of in situ prepared LSCF−GDC composite powders revealed that both the LSCF and GDC phases were uniformly distributed with a particle size of ∼90 nm without cation intermixing. The in situ LSCF−GDC cathode sintered on a GDC electrolyte showed a low polarization resistance of 0.044 Ω cm 2 at 750 °C. The active TPB density and the specific two phase (LSCF/pore) boundary area of the in situ LSCF− GDC cathode were quantified via a 3D reconstruction technique, resulting in 12.7 μm −2 and 2.9 μm −1 , respectively. These values are significantly higher as compared to reported values of other LSCF−GDC cathodes, demonstrating highly well-distributed LSCF and GDC at the nanoscale. A solid oxide fuel cell employing the in situ LSCF−GDC cathode yielded excellent power output of ∼1.2 W cm −2 at 750 °C and high stability up to 500 h.

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