Composites containing cobalt oxide (Co
3
O
4
) nanocubes integrated with multiwall carbon nanotubes (MWCNT) were synthesized by a hydrothermal route. The fractions of MWCNTs in the composite were ...varied from 4, 8, 12, 16 and 20 wt.%, and the resulting materials are denoted as C1, C2, C3, C4 and C5, respectively. The formation of products with high structural crystallinity was confirmed by X-ray photoelectron spectroscopy, Raman spectroscopy and X-ray diffraction. A morphological study by field emission scanning electron microscopy and high resolution transmission electron microscopy showed the successful integration of Co
3
O
4
nanocubes to the MWCNTs with an average particle size of ∼32 nm. The surface of a glassy carbon electrode (GCE) was modified with the nanocomposites in order to evaluate the electrochemical performance of the nanocomposites. Cyclic voltammetry showed that the C4-modified GCE displays best performance in terms of oxidation potential and peak current in comparison to that of a bare GCE, Co
3
O
4
nanocubes, or GCEs modified with C1, C2, C3 or C5. The detection limit (at an S/N ratio of 3) is 0.176 nM by using chronoamperometry, and the linear range is between 1 and 20 μM.
Graphical abstract
MWCNT-Co
3
O
4
nanocubes were synthesized by one pot hydrothermal route. The nanocomposite is used for electrochemical detection of dopamine. The limit of detection is found to be 176 nM by chronoamperometry at a constant potential of + 0.13 V.
Supercapattery has emerged as a promising energy storage solution, combining the attributes of batteries and supercapacitors to deliver a system with outstanding power and energy density. This study ...involved the synthesis of four cobalt phosphate (Co3(PO4)2) samples using sonochemical and microwave-assisted hydrothermal methods, with two samples undergoing post-calcination at 200 °C. Among these samples, the one synthesized through microwave-assisted hydrothermal synthesis followed by calcination at 200 °C (CM-200) exhibited the highest specific capacity of 272.74C/g, surpassing the others. The exceptional performance of CM-200 can be attributed to its amorphous nature, offering abundant redox-active sites for efficient redox reactions. In constructing a supercapattery, CM-200 served as the positive electrode alongside activated carbon as the negative electrode, resulting in an energy density of 18.85 Wh/kg and a power density of 750 W/kg. Moreover, this supercapattery displayed impressive durability, enduring up to 3000 cycles while retaining 98.55 % of its initial capacity.
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•Microwave-assisted hydrothermal produces an amorphous structure of CM-200.•The CM-200 shows a high specific capacity of 272.74C/g at 1 A/g.•The CM-200 shows a maximum energy density of 18.85 Wh/kg at 750 W/kg.•The CM-200 exhibits excellent cyclic stability after 3000 cycles.
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GEOZS, IJS, IMTLJ, KILJ, KISLJ, NLZOH, NUK, OILJ, PNG, SAZU, SBCE, SBJE, UILJ, UL, UM, UPCLJ, UPUK, ZAGLJ, ZRSKP
Liquid electrolytes (LEs) have been widely exploited in commercial electric double-layer capacitors (EDLCs). However, LEs pose problems of leakage, flammability, and volatility. In this work, gel ...polymer electrolytes (GPEs) have been prepared using poly (vinyl alcohol-co-ethylene) (PVA-co-PE), dimethyl sulfoxide (DMSO), sodium iodide (NaI), and triethylene glycol dimethyl ether (triglyme). After addition of triglyme, the ionic conductivity of GPEs increased about 19.84% larger than the GPEs without the presence of triglyme. This is contributed to the existence of abundant oxygen-containing functional groups provided by triglyme that formed crown ether around Na
+
ions. Thus, the number of unpaired ions increased in the GPEs. The prepared GPEs have been used to fabricate EDLCs. AC/G10/AC containing triglyme achieved the maximum specific capacitance of 25.95 F/g at 3 mV/s and 13.85 F/g at 0.03 A/g. In addition, AC/G10/AC retained capacitance of ~ 98% after 5000 cycles.
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EMUNI, FIS, FZAB, GEOZS, GIS, IJS, IMTLJ, KILJ, KISLJ, MFDPS, NLZOH, NUK, OILJ, PNG, SAZU, SBCE, SBJE, SBMB, SBNM, UKNU, UL, UM, UPUK, VKSCE, ZAGLJ
Metal carbonate hydroxide hydrates are intensively explored in industries as a precursor however, their exploration in energy storage application is still in its infant stage. Thus, in this work, a ...highly performing 3D nickel carbonate hydroxide hydrate (NCHH) was attempted via hydrothermal method by adjusting the nickel chloride hexahydrate to urea ratio. On top of that, a novel approach on electrochemical enhancement was done by varying the specification of the substrate (Ni foam). Field emission scanning electron microscopy (FESEM) and N2 Brunauer-Emmett-Teller (BET) were performed, and it was perceived that morphological properties of the Ni-foam (NF) play a vital role in the enhancement of electrochemical performance. From the three different NFs analysed, NF with a flat branch and rough surface shows a significant electrochemical performance elevation of optimized NCHH in terms of specific capacitance (from 1062.67 Fg−1 to 1746.17 Fg−1) and energy density (from 33.60 Wh kg−1 to 56.48 Wh kg−1). Supercapattery was then assembled using the optimized NCHH as the positive terminal and activated carbon as the negative terminal. The device delivered a satisfactory energy density of 12.19 Wh kg−1 at 3 Ag−1 with a magnificent power density of 16,035 W kg−1 at 10 Ag−1. Together, it revealed a fascinating cyclic stability of 97.21 % over 10,000 cycles.
3D flower shaped NHM were synthesized and deposited on NF3 exhibited the optimized results. Upon combination of the NHM1–3 with AC the supercapattery revealed a superior cyclic stability and power density. Display omitted
•3D Nickel hydroxide mixture was fabricated using facile hydrothermal method.•Different Ni-foam specification greatly affects the electrochemical performance.•NHM1–3 energy density surged up to 56.48 Wh kg−1 at 3 Ag−1 via NF optimization.•Supercapattery exhibited magnifying power density up to 16 kW kg−1 at 10 Ag−1.
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GEOZS, IJS, IMTLJ, KILJ, KISLJ, NLZOH, NUK, OILJ, PNG, SAZU, SBCE, SBJE, UILJ, UL, UM, UPCLJ, UPUK, ZAGLJ, ZRSKP
•Nanocomposite of PANI/Ni3(PO4)2/Ag3PO4 as positive electrode of supercapattery.•Effect of physical interaction between PANI and metal phosphate.•The rate capability of Ni3(PO4)2 is significantly ...enhanced after the addition of Ag3PO4 and PANI.•The supercapattery shows high specific energy and specific power and prolong life cycle.
The growth of portable technologies and electrical automotive industry has led to the development of supercapattery, as one of the options in the electrochemical energy storage system. In this work, nanocomposite of polyaniline-metal phosphate (comprising nickel phosphate-silver phosphate (Ni3(PO4)2-Ag3PO4) nanocomposite) was synthesized by two-step route; a combination of sonochemical-calcination method, followed by the physical blending method. Structural and morphology studies reveal that crystalline Ag3PO4 which were decorated on amorphous Ni3(PO4)2 were supported by semi-crystalline PANI nanofibers. The electrochemical performance studies show the resultant PANI-Ni3(PO4)2-Ag3PO4 exhibited significantly improved rate capability from 32% (Ni3(PO4)2) to 73% with a maximum specific capacity of 677 C/g. The origin of the outstanding performance shown by PANI-Ni3(PO4)2-Ag3PO4 was due to the synergistic effect produced by the conductive platform provided by PANI, redox behavior of Ni3(PO4)2 and extended channels provided by Ag3PO4. In order to evaluate the real-time performance of PANI-Ni3(PO4)2-Ag3PO4, supercapattery devices were fabricated in a configuration of PANI-Ni3(PO4)2-Ag3PO4//activated carbon (AC), Ni3(PO4)2-Ag3PO4//AC and Ni3(PO4)2//AC. PANI-Ni3(PO4)2-Ag3PO4//AC produced a superior performance by providing specific energy of 38.9 Wh/kg at 400 W/kg compared to its counterpart devices. Moreover, the life cycle test of PANI-Ni3(PO4)2-Ag3PO4//AC demonstrated high stability which lost only 12% of its initial capacity after 5000 cycles.
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GEOZS, IJS, IMTLJ, KILJ, KISLJ, NLZOH, NUK, OILJ, PNG, SAZU, SBCE, SBJE, UILJ, UL, UM, UPCLJ, UPUK, ZAGLJ, ZRSKP
NASICON-structured Na3Zr2(SiO4)2PO4 (NZSP) is regarded as one of the most promising solid-state electrolytes (SSEs) for all-solid-state Na-ion batteries mainly due to its high thermal stability and ...wide electrochemical window. However, the existing NZSP tends to exhibit lower ionic conductivity at room temperature. Thus, in order to solve this issue, NaH2PO4 was chosen as a novel phosphate source for the synthesis of NZSP via solid-state reaction method. On top of that, excess sodium (Na) and phosphorus (P) were also added into parent NZSP SSE with different weight percentage ratios to investigate their effects on Na+ ion activation energy. Structural study reveals NZSP with either excess Na or P have the same crystal structure morphology but are dissimilar in terms of the presence of impurities and grain size. NZSP with the excess of Na shows the highest ionic conductivity (1.05 × 10−3 S cm−1) and electrode polarization contributed by the increasing of Na+ carriers and the excess Na+ ion vacancies. These results authenticate that the excess of Na can be an effective way to improve the performance of NZSP SSE for energy storage application.
•NASICON-structured Na3Zr2(SiO4)2PO4 (NZSP) solid-state electrolytes (SSE) were synthesized based on different Na/P excess.•Ionic conductivity of the NZSP SSE was improved to 1.05 × 10-3 S cm-1 by the addition of 5 wt. % Na excess.•Increase of Na+ ion concentration and formation of beneficial secondary phase enhance the ion transport in NZSP SSE.•Addition of Na excess serves for boosting performance of NASICON-structured SSE in energy storage system application.
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GEOZS, IJS, IMTLJ, KILJ, KISLJ, NLZOH, NUK, OILJ, PNG, SAZU, SBCE, SBJE, UILJ, UL, UM, UPCLJ, UPUK, ZAGLJ, ZRSKP
Green solid polymer electrolytes have drawn attention as multifunctional electrolyte as compared to liquid electrolyte due to their flexibility membranes. In the present work, biodegradable ...iota-carrageenan polymer has been chosen as the host polymer with magnesium tri-fluromethanesulfonate (MgTf
2
) as the salt. The polymer film was incorporated with methyl-trioctylammonium bis(trifluoromethyl sulfonyl)imide (AmNTFSI) ionic liquid to amplify the ionic conductivity via adding mobile cations and tuning the crystallinity as well as the glass temperature of the polymer. Upon the incorporation of AmNTFSI, the ionic conductivity was remarkably augmented from (1.24
+
0.01) × 10
−6
S cm
−1
to the maximum value of (3.20
+
0.01) × 10
−3
S cm
−1
at room temperature. The thermal, structural, and temperature dependence conductivity measurements of polymer films (with and without AmNTFSI) have been analyzed, and the performance as the supercapacitor electrolytes has been evaluated.
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EMUNI, FIS, FZAB, GEOZS, GIS, IJS, IMTLJ, KILJ, KISLJ, MFDPS, NLZOH, NUK, OILJ, PNG, SAZU, SBCE, SBJE, SBMB, SBNM, UKNU, UL, UM, UPUK, VKSCE, ZAGLJ
This article describes the impact of several weight percentages of copper oxide (CuO) as a nanofiller on the structure, morphology, and electrochemical performance of dye-sensitized solar cells ...(DSSC). CuO-350 was synthesized using a sonochemical method following by calcination at 350 ℃ and was incorporated into the polymer-salt system to develop a polymer composite gel electrolyte (PCGE). The improvement in the amorphous phase and complexation between the constituents were proven via X-ray diffraction, and Fourier transform infrared. However, the thermal stability declines with the addition of CuO-350 nanofillers. It was found that TCuO350–5 exhibited the highest ionic conductivity and apparent diffusion coefficient of triiodide of (3.49±0.01)×10−3 S cm−1 and 1.48 × 10−5 cm2 s−1, respectively. The best-performing sample among PCGE is found to be TCuO350–5, containing 5 wt% of CuO-350 with an efficiency of 7.69% with JSC of 23.47 mA cm−2, VOC of 0.62 V, and fill factor of 52.9%. In addition, it also has the highest charge collection efficiency (87.31%) and longest electron lifetime (1.446 s). TCuO350–5 has achieved the stability of the device with efficiency retained 92% at room temperature and retains 80% efficiency even at 80 ℃.
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GEOZS, IJS, IMTLJ, KILJ, KISLJ, NLZOH, NUK, OILJ, PNG, SAZU, SBCE, SBJE, UILJ, UL, UM, UPCLJ, UPUK, ZAGLJ, ZRSKP
