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The complex metallic alloy (CMA), Al 76.8 Fe 24 , was in-situ synthesized in the Al-based hybrid composite by powder metallurgy technique. The structural analysis by X-ray diffraction, scanning electron microscopy, and transmission electron microscopy indicated that the Al 76.8 Fe 24 CMA phase was formed by diffusion of Fe atoms into the Al matrix during the sintering stage. The formation of the CMA phase was mainly determined by the sintering temperature which was just above the eutectic temperature of Al–Fe. Moreover, the fully dense Al-based hybrid composite was obtained and exhibited ultrahigh strength ∼1100 MPa, indicating that this method is expected to be effective in producing CMA particle reinforced Al-based hybrid composite. [ABSTRACT FROM AUTHOR]

Cobalt-based nanomaterials are a highly promising class of energy storage materials with high theoretical capacity and excellent long-term service life, such as metal doping and structural porousness of these cobalt-based nanocomposites, have been regarded as effective methods to further increase their active sites and improve their conductivity and performance. However, synthesizing cathode materials with high specific capacity and energy density through simplistic methods remains an immense obstacle. In this study, Mn doped cobalt-based hydroxide/sulfide nanocomposites with large pore volume as well as specific surface area were successfully synthesized. The Co(OH)2/CoS electrode doped with Mn has better charge storage capacity (capacity increase from 586.5C g−1to 1030.8C g−1at 0.5 A g−1), excellent rate performance (with a capacity retention of 75.8 % at 10 A g−1). Additionally, a hybrid supercapacitor (HSC) was constructed utilizing Mn-Co(OH)2/CoS and activated carbon (AC). HSC exhibited excellent charge storage capacity (166.3 F g−1at 0.5 A g−1) and remained at 164.1 % of its original value after 30,000 cycles of testing with high current density. In addition, at a power density of 410.0 W kg−1, the assembled HSC device demonstrates a significant energy density of 62.1 Wh kg−1, revealing that porous Mn-Co(OH)2/CoS electrode materials showed excellent energy storage properties.

A new SnO2(ZnO:Sn)mpolytypoid nanowire has been synthesized through a two-step chemical vapor deposition (CVD) method. Cs-corrected scanning transmission electron microscopy (STEM) studies indicate the crystal structure consists of an alternating stack of a Sn–O octahedral layer and a (Sn/Zn)–O wurtzite slab. First-principles density-functional theory (DFT) calculations suggest Sn atoms in the Sn-doped ZnO slabs have both 4- and 6-fold coordination, forming an inversion boundary of polarity. The SnO2(ZnO:Sn)mnanowires may exhibit unique anisotropic electronic properties: poor conductivity along the wire axis, but metallic conductivity along the diametrical directions according to the calculations.

Low-cost broad-band optical limiters based on nanographene have been studied, finding optical-limiting properties superior to those of current standards, carbon fullerenes (C60) solutions and carbon black suspensions. Further examination indicates that the presence of π conjugation improves the optical-limiting responses. Superior limiting performance is retained regardless of solvent viscosity and polarity, a unique feature of graphene not observed in C60and carbon black. Graphene suspensions in organic solvents can work under 10 Hz laser pulses without losing excellent limiting performance. More significantly, outstanding limiting properties are also preserved in a gel matrix. These nanographene-based optical limiters can thus work in solutions and solid matrixes for devices used for protecting human eyes and optical sensors from high-power lasers.

•Ultrafine Mn3O4nanowires with a diameter of 4.0 nm were synthesized using a facile colloidal method.•Mn3O4nanowires show a large surface area of 175.1 m2g−1and a large pore volume of 0.7960 cm3g−1•Mn3O4nanowire electrode exhibit a predominant surface capacitive behavior, and shows a wide potential window of -0.5∼1.1V and high specific capacitance of 433.1 F g-1at 0.5 A g-1•Mn3O4nanowires//active carbon device shows a high energy density of 26.68 Wh kg-1at a power density of 442 W kg-1.