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Nitrogen-Doped High Surface Area Carbon as Efficient Electrode Material for Supercapacitors
Kanjun Sun,Qian Yang,Guohu Zhao,Hui Peng,Guofu Ma,Ziqiang Lei 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2016 NANO Vol.11 No.7
Polyaspartic acid-based nitrogen-doped porous carbon (N-PC) has been prepared by one-step activation and carbonization of polyaspartic acid at 800℃ in N2 atmosphere. The morphologies and structures of products are characterized by X-ray diffraction, element analysis, scanning electron microscopy and N2 adsorption–desorption. The characterizations show that the morphologies and structures of the N-PC deeply depend on the additive amount of activating agent. The as-prepared activated carbon possesses irregular surface morphology with high surface area in the range of 1600–1800 m2 g-1. Furthermore, the activated carbon possesses proper amount of micropore and mesopore structures. As an electrode material for supercapacitors, the specific capacitance of N-PC is as high as 265 F g-1 at a current density of 0.5 A g-1, and it also exhibits good cyclability (retains about 93% initial capacitance after 5000 cycles).
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A New Colorimetric Sensor for Cysteine Determination Based on Dual Reacting-mediated Strategy
Honghong Rao,Ying Li,Guoliang Zhang,Zhonghua Xue,Guohu Zhao,Shengyin Li,Xinzhen Du 대한화학회 2017 Bulletin of the Korean Chemical Society Vol.38 No.9
Rapid and simple determination of cysteine is a key requirement for both diagnosis and treatment of diseases. A novel concept is proposed for combining dual reacting-mediated process into the construction of a simple yet effective colorimetric strategy for cysteine detecting, which is based on the analyte-induced formation of ferrous ion and graphene oxide-supported ionic recognition through selective coordination process between phenanthroline molecule and ferrous ion. In colorimetric analysis, the simple principle of ferrous ion that cysteine-induced can be recognized by phenanthroline indicator due to their good binding affinity and therefore provided a sensitive optical readout for conveniently detecting cysteine. Proof-concept experiments demonstrate that the proposed colorimetric system shows rapid response toward cysteine determination as well as with a satisfying detection limit of 4.8 μM only by using simple UV–Vis spectroscopy and 15 μM with the naked eye.
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