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Wasted coffee grounds (WCGs) were activated by a pyrolysis process using KOH, where the porosity increased with temperature, exhibiting a micropore-dominant structure. WCGs upon an activation temperature of 800 °C (AWCG800) showed a surface area up to 1856 m2 g−1 and a specific capacitance of 180.3 F g−1 in 1 M NaCl solution at a scan rate of 10 mV s−1. The AWCG800 electrodes showed an electrosorption...
A new electrochemical sensor based on the multiwalled carbon nanotube (MWCNT)/Li 4 Ti 5 O 12 -modified glassy carbon electrode for determination of bisphenol A (BPA) was developed by modifying the surface of a glassy carbon electrode with the prepared composite Li 4 Ti 5 O 12 /MWCNTs. The morphology and structure of the...
BaFeO4 was prepared by using the raw material K2FeO4. The structure of the product was characterized by X-ray diffraction and infrared radiation. Particle size and morphology were analyzed by SEM. BaFeO4, the mixture of BaFeO4, and additives were used as cathode, zinc used as anode, with which discharge performance test was carried out in the KOH electrolyte with a concentration of 14 mol/L. The results...
A new Li4Ti5O12–SnO2 composite anode material for lithium-ion batteries has been prepared by loading SnO2 on Li4Ti5O12 to obtain composite material with improved electrochemical performance relative to Li4Ti5O12 and SnO2. The composite material was characterized by X-ray diffraction and scanning electron microscopy. The results indicated that SnO2 particles have encapsulated on the surface of the...
LiCoO2 particles were synthesized by a sol-gel process. X-ray diffraction analysis reveals that the prepared sample is a single phase with layered structure. A hybrid electrochemical capacitor was fabricated with LiCoO2 as a positive electrode and activated carbon (AC) as a negative electrode in various aqueous electrolytes. Pseudo-capacitive properties of the LiCoO2/AC electrochemical capacitor were...
The effects of dopant on the electrochemical properties of spinel-type Li3.97M0.1Ti4.94O12 (M = Mn, Ni, Co) and Li(4-x/3)CrxTi(5-2x/3)O12(x = 0.1, 0.3, 0.6, 0.9, 1.5) were systematically investigated. Charge-discharge cycling were performed at a constant current density of 0.5 mA/cm2 between the cut-off voltages of 3.0 and 1.0 V, the experimental results showed that Cr3+ dopant improved the reversible...
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