Synthesis and characterization of Co/SrCO3 nanorods-decorated carbon nanofibers as novel electrocatalyst for methanol oxidation in alkaline medium

Ghouri, Zafar Khan; Barakat, Nasser A.M.; Park, Soo‐Jin; Kim, Byoung‐Suhk; Kim, Hee Young

doi:10.1016/j.ceramint.2015.01.103

Cited by 40 publications

(19 citation statements)

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“…Among encouraging alternative sources of energy, supercapacitors are one of the promising electrochemical energy storage devices, with high power characteristics compared to batteries, high energy density compared to conventional capacitors, and long cycling times [2][3][4][5][6].Hence, supercapacitors have been practically used in various applications, and offer potential benefits in communications, consumer electronics, aviation, transportation and associated technologies [7][8][9]. It is well known that the performance of electrochemical double layer capacitors (EDLCs) typically depends on the high specific surface area and highly reversible redox reactions of the electrode materials [10].…”

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Experimental study on synthesis of Co/CeO₂-doped carbon nanofibers and its performance in supercapacitors

Kim¹,

Ghouri²,

Khan³

et al. 2015

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Because of avaricious global energy consumption, and serious environmental issues, the demand for clean energy technology has grown to a significant level, and the development of emerging effective energy devices and resources has become one of the most important topics in recent decades, and has attracted passionate research [1]. Among encouraging alternative sources of energy, supercapacitors are one of the promising electrochemical energy storage devices, with high power characteristics compared to batteries, high energy density compared to conventional capacitors, and long cycling times [2][3][4][5][6].Hence, supercapacitors have been practically used in various applications, and offer potential benefits in communications, consumer electronics, aviation, transportation and associated technologies [7][8][9]. It is well known that the performance of electrochemical double layer capacitors (EDLCs) typically depends on the high specific surface area and highly reversible redox reactions of the electrode materials [10]. Therefore, various carbonaceous materials, such as carbon nanotubes, activated carbons, carbon blacks, carbon aerogels and carbon fibers have been investigated as electrode materials for supercapacitors. Comparatively, carbon nanofibers (CNFs) have gained great importance in recent years due to their large axial ratio [11,12]. Presently, CNFs are extensively applied in many fields such as fuel cells, EDLCs, hydrogen energy and lithium-ion cells [13][14][15][16][17].On CeO 2 has received considerable attention due to its remarkable properties and wide applications in various fields such as oxygen permeation membrane systems [25,26], low-temperature water-gas shift reaction [27,28], oxygen sensors [29,30], glass-polishing materials [31,32], and fuel cells [33][34][35][36].In this paper, we demonstrate a methodology for the synthesis of Co/CeO 2 -doped CNFs, which are introduced as an electrode of electrochemical capacitors (EC). The proposed nanostructures were synthesized by the carbonization of an electrospun mat composed of cerium acetate, cobalt acetate, and poly(vinyl alcohol) (PVA) in an argon atmosphere at 700°C.Cobalt (II) acetate tetrahydrate (CoAc, 98%; Aldrich, St. Louis, MO, USA) and cerium (III) acetate hydrate (CeAc, 99.9%; Aldrich) were used as the precursors for Co and CeO 2 while PVA with a molecular weight 65,000 g/mol (Aldrich) was used as the precursor for the carbon fiber.A mixture containing 75 wt% CoAc and 25 wt% CeAc was mixed with 15 g PVA aqueous solution (10 wt%). Finally the mixture was stirred at room temperature for 5 h to obtain a transparent mixture. The obtained sol-gel was electrospun at a high voltage of 21 kV using a direct current (DC) power supply at room temperature. The produced mats were dried at room temperature for 10 h and then under vacuum overnight at 70°C and finally carbonized DOI: http://dx.doi.org/

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Experimental study on synthesis of Co/CeO₂-doped carbon nanofibers and its performance in supercapacitors

Kim¹,

Ghouri²,

Khan³

et al. 2015

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“…Therefore, due to the well documented adsorption capability of carbon, it has been combined in many lately documented electrocatalytic materials 4, 5, 27 .…”

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ZnO@C (core@shell) microspheres derived from spent coffee grounds as applicable non-precious electrode material for DMFCs

Ghouri

Al‐Meer

Barakat

et al. 2017

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Although numerous reports have introduced non precious electrocatalysts for methanol oxidation, most of those studies did not consider the corresponding high onset potential which restricts utilization in real fuel cells. In this study, an −90 mV [vs. Ag/AgCl] onset potential non-precious electrocatalyst is introduced as an applicable anode material for the direct methanol fuel cells. Moreover, the proposed material was prepared from a cheap and abundantly existing resource; the spent coffee grounds. Typically, the spent coffee grounds were facilely converted to core@shell (ZnO@C) microspheres through a two-step approach, involving chemical activation and a subsequent calcination at temperature of 700 °C. Activation of the carbon derived from the spent coffee grounds was performed with ZnCl2 which acts as pore-forming agent as well as a precursor for the ZnO. The structure and morphology were characterized by (XRD), (SEM), and (TEM) analyses while the electrochemical characterizations was evaluated by cyclic voltammetry (CV) technique. Besides the comparatively very low onset potential, the introduced microspheres exhibited relatively high current density; 17 mA/cm2. Overall, based on the advantages of the green source of carbon and the good electrocatalytic activity, the spent coffee grounds-derived carbon can be considered a promise anode material for the DMFCs.

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“…More importantly, the O−H groups in the PVA chain produce hydrogen bond with oxygen atoms, which improve the solubility of acetate‐based metal salts. Consequently, due to the synergetic effect, the bimetallic nanofibers have attracted much attention in different applications including lithium‐ion rechargeable batteries (LIBs), hydrogen energy, electrical double‐layer capacitors (EDLCs), and fuel cells . In recent years, the synthesis and application of lanthanide family members in the energy and environmental field has been considerably studied because of their unique optoelectronic properties ,.…”

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CePd‐Nanoparticles‐Incorporated Carbon Nanofibers as Efficient Counter Electrode for DSSCs

et al. 2018

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In this study, the cerium‐palladium (CePd) incorporated carbon nanofibers (CNFs) were manufactured by low‐cost and versatile electrospinning technique and successfully applied as a counter electrode to fabricate the dye‐sensitized solar cells (DSSCs). The utilized physiochemical techniques, X‐ray diffractometer (XRD), X‐ray photoelectron spectroscopy (XPS), field‐emission scanning electron microscope (FESEM), and transmission electron microscope (TEM) confirmed the formation of carbon nanofibers (CNFs) incorporated by Ce and Pd nanoparticles. CePd incorporated CNFs were preliminary presented good electrocatalytic activity towards the iodide redox couple, as investigated by cyclic voltammetry. The DSSC fabricated using CePd incorporated CNFs based counter electrode (CE) attained an applicable power conversion efficiency (PCE) of 4.52% along with open circuit voltage (VOC) of 0.739 V, a short‐circuit current density (JSC) of 11.42 mA/cm2 and fill factor (FF) of 0.54. According to primary results, the CePd incorporated CNFs based CE is a promising, and cost‐effective alternative CE for photoelectrochemical devices.

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Synthesis and characterization of Co/SrCO3 nanorods-decorated carbon nanofibers as novel electrocatalyst for methanol oxidation in alkaline medium

Cited by 40 publications

References 41 publications

Experimental study on synthesis of Co/CeO₂-doped carbon nanofibers and its performance in supercapacitors

Experimental study on synthesis of Co/CeO₂-doped carbon nanofibers and its performance in supercapacitors

ZnO@C (core@shell) microspheres derived from spent coffee grounds as applicable non-precious electrode material for DMFCs

CePd‐Nanoparticles‐Incorporated Carbon Nanofibers as Efficient Counter Electrode for DSSCs

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Synthesis and characterization of Co/SrCO3 nanorods-decorated carbon nanofibers as novel electrocatalyst for methanol oxidation in alkaline medium

Cited by 40 publications

References 41 publications

Experimental study on synthesis of Co/CeO2-doped carbon nanofibers and its performance in supercapacitors

Experimental study on synthesis of Co/CeO2-doped carbon nanofibers and its performance in supercapacitors

ZnO@C (core@shell) microspheres derived from spent coffee grounds as applicable non-precious electrode material for DMFCs

CePd‐Nanoparticles‐Incorporated Carbon Nanofibers as Efficient Counter Electrode for DSSCs

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Experimental study on synthesis of Co/CeO₂-doped carbon nanofibers and its performance in supercapacitors

Experimental study on synthesis of Co/CeO₂-doped carbon nanofibers and its performance in supercapacitors