title: Anomalous cyclic voltammetric response from pores smaller than ion size by voltage-induced force.
abstract: Nanoporous carbons, with different micropore size distributions, were prepared based on waste coffee grounds by a chemical activation process in order to elucidate the correlation between desolvated ions and pores smaller than the sizes of ions using an organic electrolyte. The pore structure of the coffee-based nanoporous carbon was strongly dependent on the heat-treatment temperature prior to the activation process. Cyclic voltammograms of the nanoporous carbons mainly dominated by the smaller pore relative to that of the bare ion size clearly showed deviation from an ideal feature of the current response. It was clearly envisaged that even a bare ion of a size larger than the pore size can penetrate into the pore by voltage-induced force.
authors: Institute of Advanced Composite Materials, Korea Institute of Science and Technology (KIST), 92, Chudong-Ro, Bongdong-Eup, Wanju-Gun, Jeollabuk-Do 565-905, Republic of Korea. Electronic address: cmyang1119@kist.re.kr.
authors: Cheol-Min
authors: CM
authors: Yang
authors: Institute of Advanced Composite Materials, Korea Institute of Science and Technology (KIST), 92, Chudong-Ro, Bongdong-Eup, Wanju-Gun, Jeollabuk-Do 565-905, Republic of Korea.
authors: Hwan Jung
authors: HJ
authors: Jung
authors: Research Institute of Industrial Science and Technology (RIST), 67, Cheongam-Ro, Nam-Gu, Pohang-Si, Gyeongsangbuk-Do 790-600, Republic of Korea. Electronic address: ykimj@rist.re.kr.
authors: Yong Jung
authors: YJ
authors: Kim
keywords: Bio-mass materials; Cyclic voltammograms; EDLC; Ion sieving effect; Nanoporous carbon; Supercapacitor