Carbon Congress 2018 Electrochemical performance enhancement by using graphene for energy storage and catalysis - Jae-Jin Shim - Yeungnam University.

摘要

Metal oxide or sulphide nanomaterialshave been developed for energy storage(supercapacitor), photo catalysis andsensor applications. Their performanceshave not been satisfactory and are beingimproved by several different ways. Twoor three transition metals have beenemployed or reaction conditions have beentuned to get the best results. Transitionmetal oxides or sulphides have lowthermal conductivities that result in lowsuper capacitive and catalyticperformance. To overcome this limitation,various materials that can improve theconductivity such as graphene and carbonnanotubes have studied extensively.Owing to their large surface area and highelectrical conductivity, synergistic effectsof excellent conductivities of graphene andhigh electrical properties of metal oxidesor polymers have improved the overallelectrochemical performancestremendously. In this study, graphene(natural or synthesized), graphene oxide,reduced graphene oxide, highly reducedgraphene oxide has been tested forimproving performances as a supercapacitor, sensor and photocatalyst. Othermethods have also been used such asdoping of graphene with nitrogen orsulphur, using metal sulphides instead ofmetal oxides and using highly porousmaterials as substrates. In the synthesis ofthose materials, a cleaner technology hasbeen employed. Since its first isolation in2004, graphene has become one among themost well-liked topics within the field ofmaterials science, and its highly appealingproperties have led to a plethora of scientific papers. Among the variousaffected areas of materials science, this'graphene fever' has influenced particularlythe planet of electrochemical energy-storage devices. Despite widespreadenthusiasm, it's not yet clear whethergraphene could really cause progresswithin the field. Here we deliberate theforemost current applications of grapheneboth as a active material and as an inactivecomponent from lithium-ion batteries andelectrochemical capacitors to developingtechnologies such as metal–air andmagnesium-ion batteries. By criticallyanalysing state-of-the-art technologies, weaim to address the benefits and issues ofgraphene-based materials, as well asoutline the most promising results andapplications so far.