Abstract: A composite material comprising NiMoO4—CoMoO4 nanosheets can be an electrode in a hybrid supercapacitor. A hybrid supercapacitor having a cathode comprising the composite material exhibits a large operating window, high energy density and high cycling stability. The heterostructure material may be formed by a one-step chemical bath deposition process.

Abstract: The high-rate hybrid supercapacitor (HSC) has a positive electrode made from copper oxide (CuO)-cobalt oxide (CoO) core-shell nanocactus-like heterostructures produced on a nickel foam substrate, a negative electrode made by coating nickel foam with graphene ink, and a separator of cellulose paper. The heterostructures each have a core of CuO nanoflakes and a shell of CoO nanoneedles extending from the nanoflakes. The HSC achieves a specific capacity of 173.9 mA h g?1 at 1 A g?1 and long cycle life with 94% retention over 5000 cycles at 4 A g?1, and also exhibits a stable operating voltage window of 1.6 V, energy density of 56.5 W h kg?1, and cycling stability of 98.8% retention with coulombic efficiency of 98.7% over 4000 cycles.

Abstract: A quantum dot sensitized solar cell (QDSSC) includes a highly catalytic Ni-doped CuS thin film as a counter electrode (CE). The Ni-doped CuS CE can deliver outstanding electrocatalytic activity, conductivity, and low-charge transfer resistance at the CE/electrolyte interface. As a result, the QDSSC can achieve higher efficiency (?=4.36%) than a QDSSC with a bare CuS CE (3.24%).

Abstract: Hierarchical nanostructured cathode and anode are provided for an asymmetric supercapacitor, with the cathode including Co9S8—Ni3S2 nanoparticles anchored on CuMn2O4—NiMn2O4 nanosheet arrays and the anode including rhombus-like shaped MnFe2O4—ZnFe2O4 nanocrystals grown on a graphene-ink coated Ni foam. The asymmetric supercapacitor with the cathode and anode exhibits a large operating window, high energy density, and high cycling stability.

Abstract: A high-frequency electrotherapy apparatus capable of controlling a variety of output, frequency, and pulse shape is disclosed. The high-frequency electrotherapy apparatus comprises a main body having a switching controller controlling through a digital signal processor (DSP) and a display controller controlling through a microcontroller, and an infrared lamp for the optimum hair-growth effect. High-frequency current is transmitted through a human body using a treatment electrode contacted with a scalp and a counter electrode pad for coupling with the treatment electrode. In the high-frequency electrotherapy apparatus according to the present invention, all the conditions such as the output, frequency, and pulse shape are configured to accomplish the optimum effect for growth of hair. Also, dangerous factors for the human body are removed using a feedback circuit and a grounded frame of the main body, thereby prevent burning or electric shock.