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Kim, Dongwon,Kim, Jong Min,Jeon, Youngmoo,Lee, Jeongyeon,Oh, Jiseop,Hooch Antink, Wytse,Kim, Daekyu,Piao, Yuanzhe Elsevier 2018 Sensors and actuators. B, Chemical Vol.259 No.-
<P><B>Abstract</B></P> <P>The determination of the concentration of acetaminophen (AC) in the human body is of significant importance to carefully monitor and regular drug safety and public health. However, most conventional methods are insufficient due to their time-consuming, expensive and complicated nature. In this study, we report a novel two-step activation of biomass-derived carbon for the electrochemical determination of AC. The electrode material is prepared by a two-step activation process, which involves the initial activation of kelp powder with ZnCl<SUB>2</SUB>, followed by an activation step with KOH. The activation procedure greatly increased the overall pore volume and specific surface area. The characterizations of ZnCl<SUB>2</SUB>-KOH activated kelp carbon (ZKAKC) were conducted with scanning electron microscopy (SEM), transmission electron microscopy (TEM), Raman spectroscopy, Brunauer-Emmett-Teller (BET) surface area analysis, and electrochemical impedance spectroscopy (EIS). The electrochemical characterization of ZKAKC was performed with cyclic voltammetry (CV) analysis of potassium ferricyanide. The sensing ability of ZKAKC/GCE toward acetaminophen was conducted using CV analysis and differential pulse voltammetry (DPV). The modified electrode showed high sensitivity, selectivity and a good detection limit for the determination acetaminophen with the detection limit of 0.004 μM. Also, the modified electrode showed good result toward acetaminophen even in the presence of ascorbic acid and dopamine with the detection limit of 0.007 μM. For the evaluation of sensing ability as an actual electrochemical sensor, a real sample test was conducted. The electrochemical performance was enhanced due to the increased physical and electrochemical surface area, which occurred during the two-step activation process. This approach for producing activated carbon is crucial for future development and can be applied to different carbon source materials.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Activated carbon was prepared with a novel two-step activation process. </LI> <LI> Kelp is used as source material for the biomass-derived activated carbon. </LI> <LI> The modified electrode was used for the electrochemical determination of acetaminophen. </LI> <LI> High sensitivity toward acetaminophen and a low detection limit were achieved. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Chenfeng Ding,Xiaodong Yan,Jin‑le Lan,Seungkon Ryu,Yunhua Yu,Xiaoping Yang 한국탄소학회 2019 Carbon Letters Vol.29 No.3
Sustainable biomass-derived porous carbons demonstrate excellent capacitive properties owing to their heteroatom-rich nature and distinct textural feature. Herein, a series of nitrogen-/phosphorus-/oxygen-containing microporous carbons (CWWN/ P/O-MPCs) have been successfully fabricated by etching in H2O2 solution, pre-treatment of camphor wood wastes with KOH solution and subsequent carbonization. As an electrode material for supercapacitors, the typical microporous carbon (CWW-N/P/O-MPCs-0.5) exhibits a remarkably high specific capacitance of 245 F g− 1 at 0.5 A g− 1, corresponding to an impressively large volumetric capacitance of 208 F m− 3, and excellent long-term stability over 10,000 cycles. The excellent electrochemical performance can be ascribed to the optimal combination of heteroatom groups and ultrafine micropores.
Ding Chenfeng,Yan Xiaodong,Lan Jin-le,유승곤,Yu Yunhua,Yang Xiaoping 한국탄소학회 2019 Carbon Letters Vol.29 No.3
Sustainable biomass-derived porous carbons demonstrate excellent capacitive properties owing to their heteroatom-rich nature and distinct textural feature. Herein, a series of nitrogen-/phosphorus-/oxygen-containing microporous carbons (CWW-N/P/O-MPCs) have been successfully fabricated by etching in H2O2 solution, pre-treatment of camphor wood wastes with KOH solution and subsequent carbonization. As an electrode material for supercapacitors, the typical microporous carbon (CWW-N/P/O-MPCs-0.5) exhibits a remarkably high specific capacitance of 245 F g−1 at 0.5 A g−1, corresponding to an impressively large volumetric capacitance of 208 F m−3, and excellent long-term stability over 10,000 cycles. The excellent electrochemical performance can be ascribed to the optimal combination of heteroatom groups and ultrafine micropores.
Liu Yuxuan,Cheng Xinhua,Zhang Shenghui 한국탄소학회 2022 Carbon Letters Vol.32 No.1
High-performance carbon materials were prepared via a one-step molten salt carbonization of tobacco waste used as electrode materials for supercapacitors. Carbon material prepared by carbonization for 3 h in molten CaCl2 at 850 °C exhibits hierarchically porous structure and ideal capacitive behavior. In a three-electrode configuration with 1 mol L−1 H2SO4 aqueous solution, it delivers specific capacitance of 196.5 F g−1 at 0.2 A g−1, energy density of 27.2 Wh kg−1 at 0.2 A g−1, power density of 983.5 W kg−1 at 2 A g−1, and excellent cyclic stability with 94% capacitance retention after 5000 charge–discharge cycles at 1 A g−1. Moreover, in a symmetrical two-electrode configuration with 6 mol L−1 KOH aqueous solution, it delivers specific capacitance of 111.1 F g−1 at 0.2 A g−1, energy density of 3.8 Wh kg−1 at 0.2 A g−1, and power density of 482.0 W kg−1 at 2 A g−1. The relationship between hierarchically porous structure and capacitive performance is also discussed.
Arthi Gopalakrishnan,Sushmee Badhulika 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.68 No.-
Here, a controlled green synthesis route involving hydrothermal pre-carbonization cum pyrolysis is reported that converts cucumber into graphene-like carbon nanosheets for supercapacitor application. Transmission electron microscopy analysis reveals the formation of ultra-thin carbon nanosheets with distributed pores. This cucumber derived carbon exhibits high specific capacitance of 143 F g−1 in aqueous electrolyte. The two-electrode symmetric cell exhibits a specific capacitance of 58 F g−1 at high current density, and high capacitance retention of 97% after 1000 cycles. This simple low-cost process involving widely available cucumber as biomass precursor is a promising, commercially viable approach for developing high-performance supercapacitors.
Meng, Yanshuang,Cheng, Yulong,Ke, Xinyou,Ren, Guofeng,Zhu, Fuliang The Korean Electrochemical Society 2021 Journal of electrochemical science and technology Vol.12 No.2
The inverse spinel Cobalt ferrite (CoFe<sub>2</sub>O<sub>4</sub>, CFO) is considered to be a promising alternative to commercial graphite anodes for lithium ion batteries (LIBs). However, the further development of CFO is limited by its unstable structure during battery cycling and low electrical conductivity. In an effort to address the challenge, we construct three-dimensional hierarchical flower-like CFO nanoclusters (CFO NCs)-decorated carbonized cotton carbon fiber (CFO NCs/CCF) composite. This structure is consisted of microfibers and nanoflower cluster composited of CFO nanoparticle, in which CCF can be used as a long-range conductive matrix, while flower-like CFO NCs can provide abundant active sites, large electrode/electrolyte interface, short lithium ion diffusion path, and alleviated structural stress. As anode materials in LIBs, the flower-like CFO NCs/CCF exhibits excellent electrochemical performance. After 100 cycles at a current density of 0.3 A g<sup>-1</sup>, the CFO NCs/CCF delivers a discharge/charge capacity of 1008/990 mAh g<sup>-1</sup>. Even at a high current density of 15 A g<sup>-1</sup>, it still maintains a charge/discharge capacity of 362/361 mAh g<sup>-1</sup>.