Honeycomb-like hematite nanoflakes/branched polypyrrole nanoleaves heterostructures with a 3D complex structure have been synthesized and employed as high-performance negative electrodes for asymmetric supercapacitors application. 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 core-branch Fe2O3@PPy heterostructures. In addition, we have studied the mechanism of converting MoO2 nanoflakes into 2D free-standing MoS2 electrode by sulfurization process for water splitting. In this way, the atomic resolution aberration corrected HAADF STEM reveals the sulfurization mechanism in an unprecedented detail, together with EELS chemical maps. Furthermore, in-situ electrical measurements have been performed by means of c-AFM on the MoO2/MoS2 nanoflakes surfaces in order to detect their electronic active sites.
We acknowledge the funding from Generalitat de Catalunya 2014 SGR 1638, 2014 SGR 797 and MINECO coordinated projects between IREC and ICN2 TNT-FUELS and e-TNT (MAT2014-59961-C2-2-R). Xuan Zhang is grateful for financial support from China Scholarship Council. Part of the present work has been performed in the framework of Universitat Autònoma de Barcelona Materials Science PhD program.
 Peng-Yi Tang, Li-Juan Han, Aziz Genç, Yong-Min He, Xuan Zhang, Lin Zhang, José Ramón Galán-Mascarós, Joan Ramon Morante, Jordi Arbiol, Nano Energy, 22, 189-201 (2016).
To cite this abstract:Peng-Yi Tang, María de la Mata, Li-Juan Han, Albert Verdaguer, Aziz Genç, Yong-Min He, Xuan Zhang, Lin Zhang, José Ramón Galán-Mascarós, Joan Ramon Morante, Jordi Arbiol; Combined TEM/STEM and In-situ c-AFM Characterization of 2D Nanoflake-like Heterostructures for Energy Storage and Conversion Applications. The 16th European Microscopy Congress, Lyon, France. https://emc-proceedings.com/abstract/combined-temstem-and-in-situ-c-afm-characterization-of-2d-nanoflake-like-heterostructures-for-energy-storage-and-conversion-applications/. Accessed: May 27, 2019
EMC Abstracts - https://emc-proceedings.com/abstract/combined-temstem-and-in-situ-c-afm-characterization-of-2d-nanoflake-like-heterostructures-for-energy-storage-and-conversion-applications/