|About this Abstract
||MS&T22: Materials Science & Technology
||Controlled Synthesis, Processing, and Applications of Structural and Functional Nanomaterials
||H-7: Electrodeposition of MnO2 Nanosheet Networks for Charge Storage
||Yuxuan Sun, Nathaniel Skeele, Abraham Ebunu, Madeleine Flint, Kun Wang, Scott T. Misture
|On-Site Speaker (Planned)
Oxide nanosheets derived from bulk layered oxides are promising for use in applications of catalysis and energy storage. The paper demonstrates electrodeposition of high surface area MnO2 nanosheets onto conductive substrates. Neutral pH solutions were employed during electrodeposition in order to yield nominally defect-free MnO2. FIB/SEM, S/TEM, Raman and XRD studies together show that the nanosheets are of high surface area with stacked packets of ~3-10 individual layers and crumpled morphology. With short deposition times, the nanosheets form from the substrate in vertical alignment while at longer deposition times spherical clusters of MnO2 nanosheets form. The latter are poorly connected to the substrate and lower the gravimetric capacitance. Tuning the Mn3+/Mn4+ content via pH treatments shows that the pseudocapacitance increases as Mn3+ defects are created, with capacitance values reaching ~300 F/g.