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Sub-micron sized polyhedral shaped NiMn 2 O 4 particles were successfully prepared by a glycine assisted solution combustion method. The phase purity and the presence of functional groups in NiMn 2 O 4 were revealed through X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FT-IR), respectively. The formation of polyhedral shaped particles was inferred by field emission scanning electron microscopy (FE-SEM). The negative temperature coefficient of resistance (NTCR) behaviour of NiMn 2 O 4 was observed using a solid state impedance analyser in the measured temperature range between 30 and 180 C. Further, electrochemical studies revealed that NiMn 2 O 4 stores the charge through intercalation rather than by a capacitive mechanism. The electrode stores 91% of the specific capacitance by intercalation and 9% by a capacitive mechanism. Also, NiMn 2 O 4 possesses a specific capacitance of 202 F g À1 at 0.5 mA cm À2 in 1 M Na 2 SO 4 electrolyte and exhibits excellent cyclic stability over 15 000 cycles. Similarly, the fabricated asymmetric device (FeVO 4 kNiMn 2 O 4 ) also delivers good specific capacitance (50 F g À1 at 1 mV s À1 ) and cyclic stability.

The detailed facile synthesis and material characterizations of NdNiO3 nanoparticles for a non-enzymatic glucose sensor application were discussed briefly in this paper.

Developing a novel electrode material with better electrochemical behavior and extended cyclability is a major issue in the field of hybrid capacitors. In this work, we propose a novel strategy for the facile synthesis of nickel–cobalt pyrophosphate nanoparticles anchored on graphitic carbon nitride (NiCoP 2 O 7 /g-C 3 N 4 ) via the simple solvothermal method. Field emission scanning electron microscopy and transmission electron microscopy analysis revealed the uniform anchoring of NiCoP 2 O 7 nanocomposite on g-C 3 N 4 nanosheets. Benefitting from the effect of amorphous nature and a conductive matrix of the NiCoP 2 O 7 /g-C 3 N 4 (NP3) composite, the material achieves a specific capacitance of 342 F g –1 at a scan rate of 5 mV s –1 . Impressively, the electrode shows long-term cycling stability with 100% capacitance retention over 5000 cycles. Employing activated carbon as an anode and as-prepared NP3 as a cathode, the assembled asymmetric hybrid cell exhibits high-energy density and exceptional cyclability (specific capacitance retention over 10 000 cycles). The outstanding electrochemical and cyclic stability is attributed to the shortest electron-ion pathway with effective interfacial interaction. The low electronic resistance of the NiCoP 2 O 7 /g-C 3 N 4 nanocomposite is revealed by varying the bias voltage variation in the electrochemical impedance spectroscopy. Our results promise better utilization of the bimetallic pyrophosphate-anchored g-C 3 N 4 matrix as a potential electrode for high-performance energy storage devices.

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The well-defined Lutetium (III) hexacyanoferrate microparticles were electrodeposited on poly(taurine) modified glassy carbon electrode (GCE), namely (LuHCF/poly(taurine)-GCE). The as-fabricated LuHCF/poly(taurine)-GCE possesses excellent electrochemical activities and high sensitivity toward the sensing of sulfite. The electrochemical oxidation of sulfite on LuHCF/poly(taurine)-GCE is studied by using Cyclic Voltammetry (CV), and Differential Pulse Voltammetry techniques (DPV). Remarkably, the reported modified electrode exhibits high sensitivity (448 μA mM −1 cm −2 ) and limit of detection (1.33 μM) toward the electrochemical oxidation of sulfite with superior selectivity and practicability.

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An electrocatalytic and electrochemical energy storage study of biomass-derived metal-free carbon is carried out.