scholarly journals Effect of KOH Activator on the Performance of Activated Carbon from Oil Palm Kernel Shell as Supercapacitor Electrode Material

2020 ◽  
Vol 9 (1) ◽  
pp. 13-19 ◽  
Author(s):  
Yola Azli Perdana ◽  
Rahma Joni ◽  
Emriadi Emriadi ◽  
Hemansyah Aziz
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Cyclic Voltammetry ◽  
Activated Carbon ◽  
Surface Area ◽  
Palm Kernel ◽  
X Ray Diffraction ◽  
X Ray ◽  
Palm Kernel Shell ◽  
Scanning Electron

Karbon aktif dari cangkang kelapa sawit sebagai bahan elektroda superkapasitor telah diteliti. Superkapasitor dirangkai dengan metoda plat/sandwich yang dipisahkan oleh separator. Untuk mendapatkan nilai kapasitansi yang besar dilakukan variasi jumlah aktivator terhadap karbon menggunakan aktivator KOH. Sifat fisikokimia dari karbon aktif diteliti dengan melakukan karakterisasi menggunakan XRD (X-Ray Diffraction), SEM-EDX (Scanning Electron Microscopy-Energy Dispersive X-Ray) dan SAA (Surface Area Analyzer) dan sifat elektrokimianya diteliti dengan pengukuran CV (Cyclic Voltammetry). Karbon aktif dengan perbandingan 1:5 memiliki luas permukaan yang paling besar yaitu 793,326 m2/g dan nilai kapasitansi spesifik tertinggi yaitu 99,151 F/g. The activated carbon from oil palm kernel shell as an electrode material for supercapacitors has been investigated. The supercapasitor was assembled by plate/sandwich methods. Both electrodes were separated by using a separator. To increase the capacitancy value, variations in the number of activators on carbon were carried out using KOH activator. The physicochemical properties of activated carbon were investigated by characterizing using XRD (X-Ray Diffraction), SEM-EDX (Scanning Electron Microscopy-Energy Dispersive X-Ray) and SAA (Surface Area Analyzer) and the electrochemical properties were investigated by measuring CV (Cyclic Voltammetry). Activated carbon with a ratio of 1:5 has the largest surface area of 793,326 m2/g and the highest specific capacitance value is 99,151 F/g.Keywords: activated carbon, supercapasitor, activator, surface area, specific capacitance

Regeneration of the Brewing Spent Diatomite

2014 ◽  
Vol 998-999 ◽  
pp. 1425-1428 ◽  
Author(s):  
Wen Ya Mei ◽  
Teng Hong Hui
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Fourier Transform ◽  
Surface Area ◽  
Fourier Transform Infrared ◽  
X Ray Diffraction ◽  
X Ray ◽  
Remarkable Increase ◽  
Efficient Adsorbent ◽  
Scanning Electron

Brewing spent diatomite (BSDT), a beer industrial by-product, was regenerated with calcination. The characteristics of regenerated BSDT were detected by X-ray diffraction, X-ray fluorescence, Fourier-transform infrared, and scanning electron microscopy. The results showed that the mineralization of the surface adsorbate and the remarkable increase in the Si-OH decreased the pHpzc value from 7.6 to 5.2 and increased the surface area from 36 m2/g to 52 m2/g after calcination at 800 °C. The results show that the regenerated BSTD could be employed as an efficient adsorbent for the recycling of BSDT.

Structural and morphological features of MgO powders. The key role of the preparative starting compound

1998 ◽  
Vol 13 (8) ◽  
pp. 2218-2223 ◽  
Author(s):  
S. Ardizzone ◽  
C. L. Bianchi ◽  
B. Vercelli
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Specific Surface ◽  
Surface Area ◽  
Degree Of Crystallinity ◽  
X Ray Diffraction ◽  
X Ray ◽  
Starting Compound ◽  
Scanning Electron

The present paper reports data concerning magnesia samples obtained by calcination of different precursor salts at different increasing temperatures (873–1253 K). The oxides are characterized by x- ray diffraction, scanning electron microscopy, and N2 adsorption at subcritical temperatures. The samples appear to be composed, at any temperature, of pure periclase with a degree of crystallinity which increases with the temperature of calcination. Morphologically, the products have the shape either of lamellas or of cubes of variable dimensions, depending on the nature and route of preparation of the precursor salts. The variation of the specific surface area and the degree of porosity with the nature of the precursors and the temperature is discussed.

scholarly journals Fabrication of activated carbon using two-step co-pyrolysis of used rubber and larch sawdust

BioResources ◽  
2017 ◽  
Vol 12 (4) ◽  
pp. 8641-8652
Author(s):  
Jing Geng ◽  
Lu-Fei Li ◽  
Wen-Liang Wang ◽  
Jian-Min Chang ◽  
Chang-Lei Xia ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Activated Carbon ◽  
Value Added ◽  
Physicochemical Characteristics ◽  
Activation Process ◽  
X Ray Diffraction ◽  
X Ray ◽  
Surface Areas ◽  
Scanning Electron

Characteristics of the char produced in the co-pyrolysis of used rubber and larch sawdust were studied in the conversion of low-valued pyrolysis char into value-added activated carbon using two-step co-pyrolysis, namely pyrolysis and activation processes. The physicochemical characteristics of the chars were examined by X-ray diffraction (XRD), Brunauer–Emmett–Teller (BET), and scanning electron microscopy (SEM). The results revealed that after the two-step co-pyrolysis, the upgraded carbon had BET surface areas ranging from 600 m2 g−1 to 900 m2 g−1, which were higher than the requirements for activated carbon (American Water Works Association B600 standard). Additionally, as the sawdust/rubber ratio increased, the BET value increased accordingly. A possible reaction mechanism is proposed based on the experimental results during the activation process.

Degradation of Orange IV Catalyzed by Fe/S/GAC in the Presence of H2O2

2012 ◽  
Vol 466-467 ◽  
pp. 458-462
Author(s):  
Ying Jie Zhang ◽  
Shu Fen Xu ◽  
Xia Liao ◽  
Rong Yang ◽  
Da Peng Li
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Catalytic Activity ◽  
Activated Carbon ◽  
Removal Rate ◽  
X Ray Diffraction ◽  
Heterogeneous Fenton ◽  
X Ray ◽  
Catalytic Reactivity ◽  
Scanning Electron

A new heterogeneous Fenton-like catalyst of Fe/S/GAC was prepared by granular activated carbon (GAC) soaked in solution of (NH4)2S2O8 and Fe(NO3)3. The effect of the concentration of (NH4)2S2O8 , Fe(NO3)3, drying temperature and different catalysts on the catalytic reactivity of catalyst was discussed. The removal rate of Orange IV was used to express the catalytic reactivity of the catalyst. The prepared catalysts were characterized by X-ray diffraction (XRD), specific surface area (BET) and scanning electron microscopy (SEM). The removal rate of Orange IV followed second-order kinetics. The catalyst of Fe/S/GAC has higher catalytic activity than that of Fe/GAC.

Dispersive solid phase extraction of copper and lead from water and lichen samples with an activated carbon@Fe/Mn/O composite derived from sucrose-based activated carbon

2019 ◽  
Vol 11 (41) ◽  
pp. 5311-5319 ◽  
Author(s):  
Veysel Berkdemir ◽  
Şerife Tokalıoğlu ◽  
Süleyman Yıldız ◽  
Şaban Patat
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Activated Carbon ◽  
Zeta Potential ◽  
Solid Phase ◽  
Phase Extraction ◽  
Dispersive Solid Phase Extraction ◽  
X Ray Diffraction ◽  
X Ray ◽  
Scanning Electron

In this study, an activated carbon@Fe/Mn/O composite was synthesized and characterized by X-ray diffraction, scanning electron microscopy coupled with energy dispersive X-ray spectroscopy, Brunauer, Emmett, and Teller surface area and zeta potential measurements.

scholarly journals Electrochemistry, Electrodeposition, and Photoluminescence of Eu (III)/Lanthanides (III) on Terpyridine-Functionalized Ti Nanospikes

Metals ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 977
Author(s):  
Min Hee Joo ◽  
So Jeong Park ◽  
Hye Ji Jang ◽  
Sung-Min Hong ◽  
Choong Kyun Rhee ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Cyclic Voltammetry ◽  
Photoelectron Spectroscopy ◽  
Oxidation States ◽  
Complex Structures ◽  
X Ray Diffraction ◽  
Decay Kinetics ◽  
X Ray ◽  
Scanning Electron

Terpyridine-functionalized Ti nanospike electrodes (TiNS-SiTpy) were developed and applied to cyclic voltammetry and amperometry of Ln (La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, and Yb) ions and mixed Eu (III) + Ln (III) ions in a 0.1 M NaClO4 electrolyte. Electrodeposition was successfully performed over TiNS-SiTpy electrodes, which were fully examined by scanning electron microscopy, X-ray diffraction crystallography, Fourier-transform infrared spectroscopy, energy dispersive X-ray spectroscopy, X-ray photoelectron spectroscopy, photoluminescence (PL), and PL decay kinetics. The Gd and Tb ions were found to increase PL intensities with 10× longer lifetimes of 1.32 μs and 1.03 μs, respectively, compared with that of the electrodeposited Eu sample. The crystal phase and the oxidation states were fully examined for the mixed Ln (Eu + Gd and Eu + Tb) complex structures.

scholarly journals PENGARUH KONSENTRASI KOH TERHADAP SIFAT FISIS DAN ELEKTROKIMIA ELEKTRODA KARBON DARI LIMBAH KULIT DURIAN SEBAGAI SEL SUPERKAPASITOR

2018 ◽  
Vol 15 (1) ◽  
pp. 62
Author(s):  
Pandi Kurniawan ◽  
Erman Taer ◽  
Usman Malik ◽  
Rika Taslim
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Cyclic Voltammetry ◽  
Chemical Activation ◽  
Activation Process ◽  
X Ray Diffraction ◽  
X Ray ◽  
Carbonization Process ◽  
Cell Capacitance ◽  
Scanning Electron

Activated carbon electrode have been prepare from durian shell focused in KOH concentration variations at chemical activation process. The preparation of carbon electrodes begins with pre-carbonization process, grinding using Hard Grinder and ball milling, after that followed by sieving process with particle size at range of 39 - 52 μm. Chemical activation was performed by using KOH activator agent with concentration variation of 0.5 M, 0.6 M, 0.7 M. Carbon powder are formed to pellet form using Hydraulic Press at a 8 ton compression pressure. The carbonization process is carried out a temperature of 600°C in the N2 gas atmosphere at a temperature of 900°C for 2 hours. The electrodes characterization are performed to determine the physical and electrochemical properties.The physical properties such as density, degree of cristanility, surface morfology was analyzed by calculate the electrode dimension such as, mass, thickness and diameter, X-ray diffraction analysis and Scanning Electron Microscopy Analysis. the electrochemical properties was studied the cell capacitance and the electrode capacitance specific using Cyclic Voltammetry method. the electrode density were decrease with the increasing the KOH concentration. The smallest density has been found at electrode using a KOH concentration of 0.7 M. The XRD test showed a carbon was amorfphuse structure identified by existing two broadening peaks at an angle of 2θ, ie 24.967°, 44.315° and 81.332° which describes the  (002), (100) and (112) planes. Furthermore, samples were analyzed by Scanning Electron Microscopy and X-ray diffraction. The  cyclic voltammetry result, obtained the highest specific capacitance of 89.05 F/g and cell capacitance 24,04 F was found at electrode with a KOH  concentration of 0.7 M. From this research it can be concluded that the KOH optimum concentration was 0.7 M.

High Sensitivity Electrochemical Multisensors based on Graphene-PANI Nanocomposite for Simultaneous Detection of Glucose and Urea

2016 ◽  
Vol 19 (3) ◽  
pp. 145-150 ◽  
Author(s):  
Meysam Karimi ◽  
Mohammad Rabiee ◽  
Mojgan Abdolrahim ◽  
Mohammadreza Tahriri ◽  
Daryoosh Vashayee ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Cyclic Voltammetry ◽  
Simultaneous Detection ◽  
High Sensitivity ◽  
Xrd Analysis ◽  
Experimental Results ◽  
X Ray Diffraction ◽  
X Ray ◽  
Scanning Electron

We present a study of the effect of graphene–PANI nanocomposites on the sensitivity of the urea and glucose multisensory. We used an electroctrochemical multisensor based on two electrodes located in a reservoir with two separate channels. The urease and glu-cose oxidase (GOD) were employed for detecting the urea and glucose, respectively. We characterized the graphene and graphene-PANI samples with X-ray Diffraction (XRD) analysis and scanning electron microscopy (SEM) observations. We further performed the Cyclic voltammetry and Amperometry tests. The collected experimental results revealed that the intensity of the peak significantly increases with the concentration of the urea and glucose.

scholarly journals Nanomaterial identification of powders: comparing volume specific surface area, X-ray diffraction and scanning electron microscopy methods

2019 ◽  
Vol 6 (1) ◽  
pp. 152-162 ◽  
Author(s):  
Claire Dazon ◽  
Olivier Witschger ◽  
Sébastien Bau ◽  
Vanessa Fierro ◽  
Philip L. Llewellyn
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
X Ray Diffraction ◽  
Reliable Criterion ◽  
X Ray ◽  
Area X ◽  
Scanning Electron

This work shows that the volume specific surface area could be a reliable criterion for nanomaterial identification.

Adsorption of Benzothiophene on Activated Carbon Supported Copper and Palladium

2013 ◽  
Vol 781-784 ◽  
pp. 243-246
Author(s):  
Guang Jian Wang ◽  
Jian Kang Zhang ◽  
Hui Liu
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Activated Carbon ◽  
X Ray Diffraction ◽  
X Ray ◽  
Deep Desulfurization ◽  
Ultrasonic Assisted ◽  
Model Diesel ◽  
Π Complexation ◽  
Scanning Electron

Deep desulfurization via π-complexation adsorption is a promising method for the purification of diesel. Activated carbon (AC) with copper and palladium deposited on their surfaces were investigated as adsorbents to remove benzothiophene (BT) from model diesel fuel. The adsorbents were prepared by ultrasonic-assisted impregnation and characterized using X-ray diffraction (XRD) and Scanning Electron Microscopy with Energy-dispersive X-ray Spectroscopy (SEM/EDS). The adsorption isotherms of BT were also investigated.

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