Search

Magnetic vortex pumps are characterized by their high performance and zero leakage, and in recent years, they have been applied for the transportation of antifreeze coolant in varying-temperature environments. This paper combines Computational Fluid Dynamics (CFD) with experimental verification to study the external and internal flow characteristics of magnetic vortex pumps when transporting working fluid at different temperatures, considering radial clearance flow. The results indicate that as the temperature of the medium increases, both the pump head and efficiency improve. Specifically, under the design flow rate condition, the pump head increases by 16.7% when transporting a medium at 90 °C compared to ambient-temperature conditions. Conversely, the pump head is only 16.8% of that observed under ambient-temperature conditions when transporting a medium at −30 °C. Analysis of the internal flow field reveals that the changes in pump hydraulic performance at different working fluid temperatures are primarily due to variations in the vorticity of the internal flow field. [ABSTRACT FROM AUTHOR]

Herein, we report a multiple regulation strategy towards an all-in-one NiCuMo/MoOx heterostructure for the HOR, which exhibits ultrahigh HOR activity (j@0.05V = 4.63 mA cm−2) and excellent durability for almost 24 h for the synergistic regulation of Mo and Cu on the Ni electrode. This study provides a new strategy for designing efficient non-noble metal-based HOR catalysts. [ABSTRACT FROM AUTHOR]

Summary: In this study, a CoNi/CoFe2O4 electrocatalyst with durian‐like structure was in‐suit fabricated on the conductive substrate of nickel foam using a hydrothermal method followed by a unipolar pulse electrodeposition (UPED), which was further applied for the production of hydrogen in a microbial electrolysis cell. The CoNi/CoFe2O4/NF electrode prepared with a pulse voltage of −1.2 V by the UPED exhibited the outstanding electrocatalytic activity and durability with the rate of hydrogen production achieved as high as 1.25 ± 0.0625 m3/(m3 day). The excellent performance of the electrocatalyst is attributed to the unique multilayer layered structure, which consisted of macroscopic porous NF, CoFe2O4 nanosheets, and CoNi double hydroxide nanosheets. The hierarchical architecture is binder‐free and beneficial for exposing catalytic active sites, enhancing mass transport, and large specific surface area for MEC hydrogen production. It is expected to the CoNi/CoFe2O4/NF composite electrode application in the practical microbial electrolysis cells to produce hydrogen during the treatment of wastewater. Highlights: A CoNi/CoFe2O4 electrocatalyst was prepared for microbial electrolysis cell.The electrocatalysts had unique multilevel hierarchical architecture.The electrocatalysts exhibited a high H2 production rate of 1.25 ± 0.0625 m3/(m3 day). [ABSTRACT FROM AUTHOR]

Herein, we report a multiple regulation strategy towards an all-in-one NiCuMo/MoO x heterostructure for the HOR, which exhibits ultrahigh HOR activity ( j @0.05V = 4.63 mA cm -2 ) and excellent durability for almost 24 h for the synergistic regulation of Mo and Cu on the Ni electrode. This study provides a new strategy for designing efficient non-noble metal-based HOR catalysts.