Engineering topics
Hu, Renzong
Publications and source records attributed to Hu, Renzong.
A high-energy, long cycle-life hybrid supercapacitor based on graphene composite electrodes
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A Highly Efficient and Robust Nanofiber Cathode for Solid Oxide Fuel Cells
(La 0.6 Sr 0.4 ) 0.95 Co 0.2 Fe 0.8 O 3+δ nanofiber cathode prepared by electrospinning demonstrates excellent oxygen reduction reaction (ORR) activity, as reflected by reduced polarization resistance and diminished activation energy. ORR enhancement can be attributed to the efficient mass/charge transfer. Furthermore, the nanofiber electrode shows good durability under operation conditions of solid oxide fuel cells.
Dramatically enhanced reversibility of Li 2 O in SnO 2 -based electrodes: the effect of nanostructure on high initial reversible capacity
The formation of irreversible Li 2 O during discharge is believed to be the main cause of large capacity loss and low Coulombic efficiency of oxide negative electrodes for Li batteries. This assumption may have misguided the development of high-capacity SnO 2 -based anodes in recent years. In this work we demonstrated that contrary to this perception, Li 2 O can indeed be highly reversible in a SnO 2 electrode with controlled nanostructure and achieved an initial Coulombic efficiency of ~95.5%, much higher than that previously believed to be possible (52.4%). In situ spectroscopic and diffraction analyses corroborate highly reversible electrochemical cycling, suggesting that the interfaces and grain boundaries of nano-sized SnO 2 may suppress the coarsening of Sn and enable the conversion between Li 2 O and Sn to amorphous SnO 2 when de-lithiated. These results provide important insight into the rational design of high-performance oxide electrodes for Li-ion batteries.