Poly(vinylferrocene)–Reduced Graphene Oxide as a High Power/High Capacity Cathodic Battery Material. Issue 12 (13th April 2016)

• Record Type: Journal Article
• Authors: Beladi‐Mousavi, Seyyed Mohsen; Sadaf, Shamaila; Walder, Lorenz; Gallei, Markus; Rüttiger, Christian; Eigler, Siegfried; Halbig, Christian E.
• Is Part Of: Advanced energy materials. Volume 6:Issue 12(2016)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2016-04-13
• Subjects: graphene oxide -- metallopolymer batteries -- nanocomposites -- poly(vinylferrocene) -- rGO; Energy harvesting -- Materials -- Periodicals; Energy conversion -- Materials -- Periodicals; Energy storage -- Materials -- Periodicals; Photovoltaics -- Periodicals; Fuel cells -- Periodicals; Thermoelectric materials -- Periodicals; 621.31
• DOI: 10.1002/aenm.201600108
• Languages: English
• ISSNs: 1614-6832

Abstract

Abstract : The preparation and performance of a new cathodic battery material consisting of a composite of poly(vinylferrocene) (PVFc) and reduced graphene oxide (rGO) is described. It shows the highest charge/discharge efficiency (at a rate of 100 A g −1 ) ever reported for ferrocene–polymer materials. The composite allows for specific capacities up to 0.21 mAh cm −2 (770 mC cm −2, 29 μm film thickness) at a specific capacity density of 114 mAh g −1 and less than 5% performance decay over 300 cycles. The composite material is binder free and the charge storing PVFc accounts for 88% of the total weight of the cathodic material. The superb performance is based on (i) perfect self‐assembling of oxidized PVFc on graphene oxide (GO) leading to PVFc@GO, (ii) its stepwise ( n steps) transfer onto a current collector (CC) (PVFc@GO)n @CC ( n = drop casting steps), and (iii) the efficient electrochemical transformation of GO into rGO in the composite using viologen as homogeneous electrocatalyst. The self‐assembling step is analyzed by zeta potential and atomic force microscopy (AFM) studies, demonstrating heavy ferrocene loading on GO and a mesoporous composite structure, respectively. Complete GO/rGO transition and quantitative ClO4 − ion breathing of the composite are found by electrochemical quartz crystal microbalance and by electrochemical AFM. Abstract : Partially oxidized poly(vinylferrocene) (PVFc) and graphene oxide (GO) build up a supramolecular complex (PVFc@GO) by self‐assembling. The composite is electrocatalytically reduced to PVFc@rGO. The cathodic battery material shows excellent charge efficiency at high discharge rates (up to 100 A g −1 ) and it is scalable up to 770 mC cm −2 at >99% coulombic efficiency with a specific capacity of 114 mAh g −1 .