Dresden 2020 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 46: Materials for Energy Storage and Conversion - Electronic Properties

MM 46.3: Vortrag

Mittwoch, 18. März 2020, 17:45–18:00, IFW D

Investigating the Role of Nanoarchitectured Current Collector in Supercapacitor Electrode with Thick Pseudocapacitive Materials — •Long Liu, Huaping Zhao, Mo Sha, Chenglin Zhang, Jiajia Qiu, and Yong Lei — Institut für Physik & IMN MacroNano (ZIK), Technische Universität Ilmenau, 98693, Ilmenau, Germany

Pseudocapacitive materials with low electrical conductivity are mainly in the form of ultrathin conformal coating in supercapacitor electrodes based on nanoarchitectured current collectors, thus the resultant low mass loading of electroactive materials largely limits the applications of nanoarchitectured current collectors. Here, supercapacitor electrodes with nickel nanorod arrays as nanoarchitectured current collectors and MnO2 as electroactive materials are fabricated to investigate the role of nanoarchitectured current collectors in determining the energy storage capability when pseudocapacitive materials are in thick layer rather than ultrathin conformal coating. Electrochemical analysis revealed that Ni nanorods could create numerous electrical conductive tunnels in the thick-layer electrodes to dramatically alleviate the contact resistance at the electroactive-materials/current-collectors interface. Larger area capacitance, better rate capability and higher structural stability was maintained in Ni nanorods based electrodes even with thick MnO2 layer than those with Ni foils as current collectors based electrode with the same configuration. These results open up new opportunities for nanoarchitectured current collectors to construct supercapacitors with superior energy storage capability.