Comparisons between A.C impedance behaviour of graphite hydrogenosulfate and p-doped (CH)x |
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| Affiliation: | 1. Department of Materials, Dalian Maritime University, Dalian, 116026, China;2. Shandong Provincial University Laboratory for Protected Horticulture, Weifang University of Science and Technology, Weifang, 262700, China;1. School of Chemical Engineering, Yeungnam University, Gyeongsan 38541, Republic of Korea;2. School of Mechanical and IT Engineering, Yeungnam University, Gyeongsan 38541, Republic of Korea;1. Advanced Energy Materials Design Lab., School of Chemical Engineering, Yeungnam University, 38541 Gyeongsan, Republic of Korea;2. School of Mechanical and IT Engineering, Yeungnam University, Gyeongsan 38541, Republic of Korea |
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| Abstract: | An electrocapillarity approach has been proposed in previous papers for electrochemical intercalation of H2SO4 into graphite, which explains the high capacitive values (170 F/g) deduced from equilibrium potential charge curves or from low frequency a.c. impedance measurements (extending the double layer capacitance to the intercalated electrolyte — graphite interface).We propose here a similar view for GaCl4− intercalated (CH)x; “switching” between doped and undoped (CH)x may correspond to the faradïc like stage transformation of Graphite Intercalation Compounds (GIC), while a charging process of (CH)x chains with counter-ions recalls the capacitive “overcharging” of pure-stage GIC. |
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