|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Frontiers in Advanced Functional Thin Films and Nanostructured Materials
||Functionalized Graphene-polyoxometalate Nanodots Assembly as “Organic-inorganic” Hybrid Supercapacitors and Advanced Electrochemical Microscopy
||Sanju Gupta, Bryce Aberg, Sara B. Carrizosa
|On-Site Speaker (Planned)
Development of next-generation stable and high-performance electrodes from pseudocapacitive polyoxometalates (phosphomolybdate acid-H3PMo12O40; POM and phosphotungstic acid-H3PW12O40; POW) and supercapacitive reduced graphene oxide (rGO) synthesized hydrothermally is presented. The rGO and POM (or POW) nanodots interactions create emergent materials and "organic-inorganic" hybrid supercapacitors enabled by bridged(covalent/electrostatic) tailored interfaces and tunable physicochemical properties. The concomitant combination of double-layer capacitance from rGO and redox (faradaic) POM (and POW) led to an intrinsic increase in specific capacitance from 70 F.g−1 (rGO) to 320 F.g−1 (hybrids) and excellent stability (~94% retention). Scanning electrochemical microscopy is used to to gain insights into physico-chemical processes and to determine heterogeneous electron transfer rate highlighting roles of graphene edge plane sites in combination with mapping electrochemical (re)activity and electroactive site distribution. The findings are attributed to mesoporous network and topologically multiplexed ionic and conductive pathways provided by graphene with localized pockets of re-hybridized orbitals contributing toward rapid charge transfer.
||Planned: Supplemental Proceedings volume