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Journal Article

Associate Professor Dr. Montree Sawangphruk

Chemical Engineering
School of Energy Science and Engineering (ESE)
Tel. +66(0) 33 014251
Email montree.s@vistec.ac.th
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1. N-doped reduced graphene oxide aerogel coated on carboxyl-modified carbon fiber paper for high-performance ionic-liquid supercapacitors

Iamprasertkun, Pawin; Krittayavathananon, Atiweena; Sawangphruk, Montree
CARBON    Volume 102, Pages 455-461, Year 2016     DOI: 10.1016/j.carbon.2015.12.092
Published: JUN 2016    Times Cited:1
Nitrogen-doped reduced graphene oxide aerogel (N-rGO aerogel) with high porosity and ionic conductivity were synthesized by a hydrothermal reduction of graphene oxide with hydrazine and following freezing-dry method. N-rGO aerogel was spray-coated on carboxyl-modified carbon fiber paper with a hydrophilic surface and used as the supercapacitor electrode. Not only can the N-rGO aerogel electrode accelerate the diffusion of the electrolyte but also it can store electronic charge via a surface redox reaction due to the N-containing groups. Among the electrolytes studied, the ionic liquid-based supercapacitor of the N-rGO aerogel provides a wide working potential of ca. 4.0 V and rather high specific capacitance of 764.53 F/g at 1 A/g with a capacity retention of 86% over 3000 charge-discharge cycles as well as maximum specific power and energy of 6525.56 W/kg and 245.00 Wh/kg, respectively. The device prototype fabricated in a single coin cell shape (CR2016) can supply electricity to red LED over 17 min. (C) 2016 Elsevier Ltd. All rights reserved.!

2. Turning conductive carbon nanospheres into nanosheets for high-performance supercapacitors of MnO2 nanorods

Phattharasupakun, Nutthaphon; Wutthiprom, Juthaporn; Chiochan, Poramane; Suktha, Phansiri; Suksomboon, Montakan; Kalasina, Saran; Sawangphruk, Montree
CHEMICAL COMMUNICATIONS    Volume 52, Issue 12, Pages 2585-2588, Year 2016     DOI: 10.1039/c5cc09648k
Published: 2016    Times Cited:0
Oxidized carbon nanosheets (OCNs), produced from black carbon nanospheres and used as a conductive additive in the supercapacitor electrodes of MnO2 nanorods, can significantly improve the charge-storage performance of the symmetric MnO2-nanorod supercapacitors with a maximum specific energy of 64 W h kg(-1) and power of 3870 W kg(-1). An optimum material composition of the supercapacitor electrode finely tuned is 60: 30: 10 wt% of MnO2: OCN: PVDF, respectively. Interestingly, after 5000 charge/discharge cycles, the oxidation numbers of Mn at the positive and negative electrodes of the as-fabricated supercapacitor are +3.22 and +3.04, respectively.!

3. High-Performance Supercapacitor of Functionalized Carbon Fiber Paper with High Surface Ionic and Bulk Electronic Conductivity: Effect of Organic Functional Groups

Suktha, Phansiri; Chiochan, Poramane; Iamprasertkun, Pawin; Wutthiprom, Juthaporn; Phattharasupakun, Nutthaphon; Suksomboon, Montakan; Kaewsongpol, Tanon; Sirisinudomkit, Pichamon; Pettong, Tanut; Sawangphruk, Montree
ELECTROCHIMICA ACTA    Volume 176, Pages 504-513, Year 2015     DOI: 10.1016/j.electacta.2015.07.044
Published: SEP 10 2015    Times Cited:4
Although carbon fiber paper (CFP) or nonwovens are widely used as a non-corrosive and conductive substrate or current collector in batteries and supercapacitors as well as a gas diffusion layer in proton exchange membrane fuel cells, the CFP cannot store charges due to its poor ionic conductivity and its hydrophobic surface. In this work, the chemically functionalized CFP (f-CFP) consisting of hydroxyl and carboxylic groups on its surface was produced by an oxidation reaction of CFP in a mixed concentrated acid solution of H2SO4:HNO3 (3: 1 v/v) at 60 degrees C for 1 h. Other amide and amine groups modified CFP were also synthesized for comparison using a dehydration reaction of carboxylic modified CFP with ethylenediamine and n-butylamine. Interestingly, it was found that hydroxyl and carboxylic groups modified CFP behave as a pseudocapacitor electrode, which can store charges via the surface redox reaction in addition to electrochemical double layer capacitance. The aqueous-based supercapacitor of f-CFP has high areal, volumetric, and specific energy (49.0 mu W.h/cm(2), 1960 mW.h/L, and 5.2 W.h/Kg) and power (3.0 mW/cm(2),120 W/L, and 326.2 W/Kg) based on the total geometrical surface area and volume as well as the total weight of positive and negative electrodes. High charge capacity of the f-CFP stems from high ionic charge and pseudocapacitive behavior due to hydroxyl and carboxylic groups on its surface and high bulk electronic conductivity (2.03 mS/cm) due to 1D carbon fiber paper. The acid treatment process here could be used to improve the charge storage capacity of other carbonaceous materials such as carbon nanotubes. (C) 2015 Elsevier Ltd. All rights reserved.!

4. High-performance supercapacitor of electrodeposited porous 3D polyaniline nanorods on functionalized carbon fiber paper: Effects of hydrophobic and hydrophilic surfaces of conductive carbon paper substrates

Kaewsongpol, Tanon; Sawangphruk, Montree; Chiochan, Poramane; Suksomboon, Montakan; Suktha, Phansiri; Srimuk, Patarachai; Krittayavathananon, Atiweena; Luanwuthi, Santamon; Iamprasertkun, Pawin; Wutthiprom, Juthaporn; Phattharasupakun, Nutthaphon; Sirisinudomkit, Pichamon; Pettong, Tanut; Limtrakul, Jumras
MATERIALS TODAY COMMUNICATIONS    Volume 4, Pages 176-185, Year 2015     DOI: 10.1016/j.mtcomm.2015.08.005
Published: SEP 2015    Times Cited:1
Although polyaniline (PANI) was electrodeposited on various conductive substrates for use as the pseudocapacitor electrodes, the effect of carbon paper surfaces has not yet been investigated. In this work, PANI was electrodeposited on two carbon surfaces including hydrophobic carbon fiber paper (CFP) and hydrophilic functionalized CFP (f-CFP). f-CFP with a bulk conductivity of 2.03 mS/cm having hydroxyl and carboxyl groups on its surface can significantly enhance the charge storage performance of the PANI/f-CFP pseudocapacitors due to its high surface ionic conductivity. The symmetric pseudocapacitors of PANI/f-CFP in aqueous and organic electrolytes exhibit much higher areal capacitance, power and energy than those of PANI coated on the hydrophobic surface of CFP. The areal capacitance of a half-cell PANI/f-CFP electrode in 1 M H2SO4 (aq.) is 704 mF/cm(2) (1323 F/g(-PANI)) at 10 mV/s. A symmetric organic-based PANI/f-CFP pseudocapacitor at an areal power of 240 mu W/cm(2) (a specific power of 351 W/kg(-PANI)) has an areal energy of 102 mu Wh/cm(2) (a specific energy of 149 Wh/kg(-PANI)). At a lower areal energy of 2.0 mu Wh/cm(2) (3 Wh/kg(-PANI)), the device has higher areal power of 2660 mu W/cm(2) (3881 W/kg(-PANI)). The stability of the device tested by galvanic charge-discharge over 2500 cycles is over 97% capacitance retention. (C) 2015 Published by Elsevier Ltd.!

5. Solid-type supercapacitor of reduced graphene oxide-metal organic framework composite coated on carbon fiber paper

Srimuk, Pattarachai; Luanwuthi, Santamon; Krittayavathananon, Atiweena; Sawangphruk, Montree
ELECTROCHIMICA ACTA    Volume 157, Pages 69-77, Year 2015     DOI: 10.1016/j.electacta.2015.01.082
Published: MAR 1 2015    Times Cited:12
A composite material of reduced graphene oxide (rGO) and Hong Kong University of Science and Technology-1 (HKUST-1) metal organic framework (MOF) was produced and used as the supercapacitor electrode material. Pure HKUST-1 has a microporous structure with poor conductivity limiting its electrochemical applications while loading rGO to HKUST-1 leads to a novel composite with a mesoporous structure and good electrochemical properties. 10 wt.% rGO/HKUST-1 has a high BET surface area of 1241m(2) g(-1), a specific pore volume of 0.78 cm(3) g(-1), and an average pore diameter of 8.2 nm, which is a proper pore size to allow uptaking and releasing of electrolytes. A half-cell electrode of 10 wt.% rGO/HKUST-1 coated on flexible carbon fiber paper (CFP) exhibits a high specific capacitance of 385 F g(-1) at 1 Ag-1 while pure HKUST-1 stores only 0.5 F g(-1). A 1.8(n) x 4.0(n) symmetric solid-type supercapacitor of the 10 wt.% rGO/HKUST-1 exhibits a specific power of 3100 W kg (-1) and a specific energy of 42 Wh kg(-1). The supercapacitor can practically supply electricity to a spinning 3-V motor over 9-min discharging time. (C) 2015 Elsevier Ltd. All rights reserved.!

6. In situ synthesis of permselective zeolitic imidazolate framework-8/graphene oxide composites: rotating disk electrode and Langmuir adsorption isotherm

Luanwuthi, Santamon; Krittayavathananon, Atiweena; Srimuk, Pattarachai; Sawangphruk, Montree
RSC ADVANCES    Volume 5, Issue 58, Pages 46617-46623, Year 2015     DOI: 10.1039/c5ra05950j
Published: 2015    Times Cited:0
Although zeolitic imidazolate framework-8 (ZIF-8) has been well known and widely used in gas storage and catalysis applications, its electrochemical application has not yet been well investigated due to its poor conductivity limiting the electronic charge transfer. In this work, graphene oxide (GO) has been loaded to ZIF-8 using an in situ synthesis in order to improve its conductivity. The morphological, structural and electrochemical properties of GO/ZIF-8 composites were studied by scanning electron and transmission electron microscopies, X-ray photoelectron and absorption spectroscopies, voltammetry, rotating disk electrode, and Langmuir adsorption isotherm. It was found that a 2 wt% loading content of GO to ZIF-8 shows high permselective property to redox probe mediators enhancing the Faradaic current of ferrocene methanol (FcOH) but reducing the Faradaic current of Fe(CN)(6)(4-). Gibbs's free energy (Delta G(0)) of the adsorption of FcOH within the 2 wt% GO/ZIF-8 film is -16.81 kJ mol(-1) indicating the spontaneous adsorption process. This composite may lead to many useful electrochemical applications of ZIF-8 especially in a research area of the permselective membrane.!

7. Palladium Nanoparticles Decorated on Reduced Graphene Oxide Rotating Disk Electrodes toward Ultrasensitive Hydrazine Detection: Effects of Particle Size and Hydrodynamic Diffusion

Krittayavathananon, Atiweena; Srimuk, Pattarachai; Luanwuthi, Santamon; Sawangphruk, Montree
ANALYTICAL CHEMISTRY    Volume 86, Issue 24, Pages 12272-12278, Year 2014     DOI: 10.1021/ac503446q
Published: DEC 16 2014    Times Cited:18
Although metal nanoparticle/graphene composites have been widely used as the electrode in electrochemical sensors, two effects, consisting of the particle size of the nanoparticles and the hydrodynamic diffusion of analytes to the electrodes, are not yet fully understood. In this work, palladium nanoparticles/reduced graphene oxide (PdNPs/rGO) composites were synthesized using an in situ polyol method. Palladium(II) ions and graphene oxide were reduced together with a reducing agent, ethylene glycol. By varying the concentration of palladium(II) nitrate, PdNPs with different sizes were decorated on the surface of rGO sheets. The as-fabricated PdNPs/rGO rotating disk electrodes (RDEs) were investigated toward hydrazine detection. Overall, a 3.7 +/- 1.4 nm diameter PdNPs/rGO RDE exhibits high performance with a rather low limit of detection of about 7 nM at a rotation speed of 6000 rpm and provides a wide linear range of 0.1-1000 mu M with R-2 = 0.995 at 2000 rpm. This electrode is highly selective to hydrazine without interference from uric acid, glucose, ammonia, caffeine, methylamine, ethylenediamine, hydroxylamine, n-butylamine, adenosine, cytosine, guanine, thymine, and l-arginine. The PdNPs/rGO RDEs with larger sizes show lower detection performance. Interestingly, the detection performance of the electrodes is sensitive to the hydrodynamic diffusion of hydrazine. The as-fabricated electrode can detect trace hydrazine in wastewater with high stability, demonstrating its practical use as an electrochemical sensor. These findings may lead to an awareness of the effect of the hydrodynamic diffusion of analyte that has been previously ignored, and the 3.7 +/- 1.4 nm PdNPs/rGO RDE may be useful toward trace hydrazine detection, especially in wastewater from related chemical industries.!

8. Silver nanodendrite modified graphene rotating disk electrode for nonenzymatic hydrogen peroxide detection

Sawangphruk, Montree; Sanguansak, Yanisa; Krittayavathananon, Atiweena; Luanwuthi, Santamon; Srimuk, Pattarachai; Nilmoung, Sukanya; Maensiri, Santi; Meevasana, Worawat; Limtrakul, Jumras
CARBON    Volume 70, Pages 287-294, Year 2014     DOI: 10.1016/j.carbon.2014.01.010
Published: APR 2014    Times Cited:13
Although silver nanostructures have been widely used for H2O2 detection, the development of silver based nanomaterials with higher performance toward H2O2 detection is still needed. In this work, metallic silver nanodendrite (AgND) modified reduced graphene oxide (rGO) electrode with open pore structure was prepared by an electrodeposition method and used for H2O2 detection. The rotating disk electrode (RDE) was used to study the convective diffusion effect of H2O2 to the electrode. The performance of the AgND/rGO electrode toward H2O2 detection significantly depends on the rotation rate of the electrode. At the rotation rates of 0 and 100 rpm, the as-fabricated electrode could not detect H2O2. At higher rotation rates, wide linear ranges of detected H2O2 concentrations with a determination coefficient R-2 of over 0.99 are found to be 1-100, 0.5-100, 0.1-100, and 0.05-30 mM at the electrode rotation rates of 500, 1000, 2000, and 6000 rpm, respectively. The LOD values determined at a signal-to-noise ratio of ca. 3 are about 100, 50, 30, and 10 mu M at 500, 1000, 2000, and 6000 rpm, respectively. The as-fabricated electrode can detect diluted H2O2 in milk demonstrating its potential sensing application. (C) 2014 Elsevier Ltd. All rights reserved.!

9. Permselective properties of graphene oxide and reduced graphene oxide electrodes

Sanguansak, Yanisa; Srimuk, Pattarachai; Krittayavathananon, Atiweena; Luanwuthi, Santamon; Chinvipas, Natee; Chiochan, Poramane; Khuntilo, Jakkrit; Klunbud, Panupong; Mungcharoen, Thumrongrut; Sawangphruk, Montree
CARBON    Volume 68, Pages 662-669, Year 2014     DOI: 10.1016/j.carbon.2013.11.047
Published: MAR 2014    Times Cited:7
Although graphene-based materials have a number of excellent properties, their permselective properties have not yet been reported. In this work, graphene oxide (GO) and its reduced form (rGO) with the C:O ratios of 2.3:1 and 10.5:1, respectively were coated on glassy carbon electrodes (GCES) and subsequently evaluated by cyclic voltammetry and an adsorption method assuming a Langmuir isotherm behavior. The GO and rGO films allow the permeation of neutral ferrocenemethanol (FcOH) and cationic Ru(NH3)(6)(3+) but restrict the permeation of anionic Fe(CN)(6)(4-) across their layers. The adsorption of FcOH and Ru(NH3)(6)(3+) within the GO and rGO films leads to the preconcentration at the electrode surface and subsequently enhances redox currents of FcOH (Fe(II)/Fe(III)) and Ru(NH3)(6)(3+) (Ru(III)/Ru(II)). Gibbs free energy changes of Fc0H and Ru(NH3)(6)(3+) adsorbed within GO and rGO films are -21 to -26 kJ mol(-1). The electrooxidation of hydrazine at the modified electrodes was also studied to demonstrate the potential application of the modified electrodes. The linear ranges of hydrazine detection with R-2 of 0.999 are 0.004-1.8 mM and 0.02-1.8 mM for rGO/GCE and GO/GCE, respectively. Limits of detection at a signal-to-noise ratio of 3 are 0.4 and 0.9 mu M for rGO/GCE and GO/GCE, respectively. (C) 2013 Elsevier Ltd. All rights reserved.!

10. Effect of alkaline electrolytes on the charge storage capacity and morphology of porous layered double cobalt hydroxide-coated graphene supercapacitor electrodes

Suksomboon, Montakan; Srimuk, Patarachai; Krittayavathananon, Atiweena; Luanwuthi, Santamon; Sawangphruk, Montree
RSC ADVANCES    Volume 4, Issue 100, Pages 56876-56882, Year 2014     DOI: 10.1039/c4ra11727a
Published: 2014    Times Cited:4
Although alpha-cobalt hydroxide (alpha-Co(OH)(2)) with a layered double hydroxide (LDH) structure has been widely used as a supercapacitor electrode, the effect of an alkaline electrolyte on the charge storage performance of the alpha-Co(OH)(2) has not yet been investigated. In this work, alpha-Co(OH)(2) was electrodeposited on reduced graphene oxide-coated carbon fiber paper (rGO/CFP) using chronoamperometry at -0.5 V vs. Ag/AgCl. The effect of alkaline aqueous electrolytes on the performance of the alpha-Co(OH)(2)/rGO/CFP electrodes was then investigated by means of scanning and transmission electron microscopies, X-ray photoelectron and absorption spectroscopies, and electrochemical techniques. It was found that the concentrated alkaline electrolytes (i.e., 3-6 M [OH-]) can strip off and/or deform the porous structure of the alpha-Co(OH) 2 deposited on rGO/CFP leading to poor charge storage capacity. 1 M [OH-] was found to be a suitable electrolyte concentration providing high specific capacitance (1096 F g(-1) at 1.8 A g(-1)) without the deformation of the porous alpha-Co(OH)(2) structure after testing. Morphological and electrochemical analyses of the alpha-Co(OH)(2)/rGO/CFP electrodes suggest that the effect of the alkaline electrolyte concentration plays a major role on the charge storage performance of alpha-Co(OH)(2)-based supercapacitors.!