Bottom-up engineering of nanoflake and nanowire heterostructures for energy storage and conversion applications

In this contribution, honeycomb-like hematite nanoflakes/branched polypyrrole nanowire heterostructures with a 3D complex structure have been synthesized and employed as high-performance negative electrodes for asymmetric... [ view full abstract ]

In this contribution, honeycomb-like hematite nanoflakes/branched polypyrrole nanowire heterostructures with a 3D complex structure have been synthesized and employed as high-performance negative electrodes for asymmetric supercapacitor applications. The detailed TEM-STEM characterization and deep EELS chemical analysis at the nanoscale has been combined to elucidate the mechanisms underlying the formation and morphology evolution of the core-branch Fe₂O₃@PPy heterostructures for supercapacitor apllication. [1]

On the other hand, we have fabricated ITO/Fe₂O₃/Fe₂TiO₅/FeNiOOH multi-Layers based on nanowire heterostructures via combination of sputtering, hydrothermal, ALD, photo-electrodepositon, methods for water splitting application. Structural, spectroscopic and electrochemical investigations disclose that the origin of the superior water oxidation performance is the interfacial coupling effect of ITO underlayer (Sn doping and conductivity promoter), ultrathin Fe₂TiO₅ coating (Ti doping, energetics and surface state density modulation) and FeNiOOH eletrocatalyst (varying surface state energy level). [2]

References
1 P.Y. Tang et al., Nano Energy, 22 (2016), 189-201.
2 P.Y. Tang et al., Energy & Environmental Science, 10 (2017), 2124-2136.