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Choi, Wonsung,Harada, Daisuke,Oyaizu, Kenichi,Nishide, Hiroyuki American Chemical Society 2011 JOURNAL OF THE AMERICAN CHEMICAL SOCIETY - Vol.133 No.49
<P>A layer of poly(2-vinylanthraquinone) on current collectors underwent reversible electrode reaction at −0.82 V vs Ag/AgCl in an aqueous electrolyte. A repeatable charging/discharging cycles with a redox capacity comparable to the formula weight-based theoretical density at the negative potential suggested that all of the anthraquinone pendants in the layer was redox-active, that electroneutralization by an electrolyte cation was accomplished throughout the polymer layer, and that the layer stayed on the current collector without exfoliation or dissolution into the electrolyte during the electrolysis. The charging/discharging behavior of the polymer layer in the aqueous electrolyte revealed the capability of undergoing electrochemistry even in the nonsolvent of the pendant group, which offered insight into the nature of the anthraquinone pendants populated on the aliphatic chain. Charging/discharging capability of air batteries was accomplished by using the polymer layer as an organic anode-active material. A test cell fabricated using the conventional MnO<SUB>2</SUB>/C cathode catalyst exhibited a discharging voltage at 0.63 V corresponding to their potential gap and a charging/discharging cycle of more than 500 cycles without loss of the capacity.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jacsat/2011/jacsat.2011.133.issue-49/ja206961t/production/images/medium/ja-2011-06961t_0004.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/ja206961t'>ACS Electronic Supporting Info</A></P>
Choi, Wonsung,Ohtani, Shota,Oyaizu, Kenichi,Nishide, Hiroyuki,Geckeler, Kurt E. WILEY‐VCH Verlag 2011 Advanced Materials Vol.23 No.38
<P><B>A transparent nanocomposite of a radical polymer,</B> the poly(2,2,6,6‐tetramethylpiperidine‐1‐oxy‐4‐yl methacrylate) (PTMA), and single‐walled carbon nanotubes (SWNTs) display a reversible charging and discharging, allowing for full discharging in seconds. This is ascribed to the reversible electrochemical reaction of the pendant radical group in PTMA aided by both PTMA wrapping at a molecular level and the SWNT network for electrical conduction.</P>
Sano, Naoki,Tomita, Wataru,Hara, Shu,Min, Cheong-Min,Lee, Jae-Suk,Oyaizu, Kenichi,Nishide, Hiroyuki American Chemical Society 2013 ACS APPLIED MATERIALS & INTERFACES Vol.5 No.4
<P>A highly cross-linked polyviologen hydrogel, poly(tripyridiniomesitylene) (PTPM), has been designed as an anode-active material. It displays a reversible two-electron redox capability at −0.4 and −0.8 V vs Ag/AgCl in an aqueous electrolyte. The PTPM layer coated on a current collector by electropolymerization via a 4-cyanopyridinium electro-coupling reaction demonstrates a rapid charging-discharging reaction with a redox capacity comparable to that obtainable using the formula weight-based theoretical density, because of the combination of the redox-active viologen moieties built into the hydrogel. A test cell that has been fabricated using the developed PTPM anode, a poly(2,2,6,6-tetramethylpiperidinyloxy-4-yl acrylamide) (PTAm)-based cathode, and an aqueous electrolyte exhibits a discharging voltage of 1.1 and 1.5 V, and has proven its ability to be recharged more than 2000 times.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/aamick/2013/aamick.2013.5.issue-4/am302647w/production/images/medium/am-2012-02647w_0012.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/am302647w'>ACS Electronic Supporting Info</A></P>