Electrochemical behaviors of silicon wafers in silica slurry

The electrochemical behaviors of n-type silicon wafers pH value and solid content of the slurry on the corrosion of silicon in silica-based slurry were investigated, and the influences of the wafers were studied by using electrochemical DC polarization and AC impedance techniques. The results revealed that these factors affected the corrosion behaviors of silicon wafers to different degrees and had their suitable parameters that made the maximum corrosion rate of the wafers. The corrosion potential of （100） sttrface was lower than that of（111）, whereas the current density of （100） was much higher than that of（111）.

Preparation and characterization of high-reactivity explosive-based nano-boron microspheres

Boron nanoparticles,with their remarkably high gravimetric and volumetric calorific values,emerge as the most promising fuel in energetic fields.However,challenges such as susceptibility to oxidation,high ignition temperature,and low combustion efficiency have constrained their further applications.In this study,we fabricated high explosives based nano-boron microspheres with uniform size using the electrostatic spray method,in which the boron nanoparticles and high explosives(CL-20 or PETN)are closely bonded together by fluorinated polymer(F2602)and evenly distributed.The results indicated that the microspheres exhibited high sphericity and showed an enhanced antioxidant capability.The addition of high-energy explosives not only reduced the thermal oxidation temperature of nano-boron powder within the microspheres but also significantly enhanced the pressurization rate.Additionally,the microspheres with added high-energy explosives released more energy during the combustion process.Compared to physically mixed samples,electrostatically sprayed microspheres with a uniform microstructure still exhibited higher reactivity.Therefore,the design and synthesis of microspheres with controllable structures using the electrostatic spray method show promising application prospects.

Oligolayered Ti3C2Tx MXene towards high performance lithium/sodium storage

Nano Research volume 13,pages1659–1667(2020)Cite this article 232 Accesses 3 Citations Metrics details Abstract 2D MXenes are highly attractive for achieving ultrafast and stable lithium/sodium storage due to their good electric conductivity and abundant redox active sites.While,effective strategies for scalable preparation of oligolayered MXenes are still under exploration.Herein,oligolayered Ti3C2Tx MXene is successfully obtained after conventional synthesis of multilayered Ti3C2 and subsequent delamination process via an organic solvent of tetramethyl-ammonium hydroxide(TMAOH).Comprehensive electrochemical study reveals that surface-controlled redox reaction dominated the charge storage behavior of oligolayered Ti3C2Tx with fast reaction kinetics.Impressively,the obtained oligolayered Ti3C2Tx exhibits excellent lithium/sodium storage performance,featured for a high specific capacity of 330 mAhg^−1 at 1.0 Ag^−1 after 800 cycles for lithium storage and 280 mAhg^−1 at 0.5 Ag^−1 after 500 cycles for sodium storage.Such impressive performance will advance the development of oligolayered Ti3C2Tx based materials for lithium/sodium storage and even broaden their application into energy storage.

Synthesis of pomegranate-shaped micron ZnMn_(2)O_(4) with enhanced lithium storage capability

As high capacity anode materials,spinel-type transition metal oxides have a bottleneck of poor cyclic stability.Nano structure and carbon loading are common modification approaches,while the high cost is unaffordable for industrial implementation.In this study,micron scale zinc manganate was synthesized by solvothermal plus calcination process.The pomegranate-shaped ZnMn_(2)O_(4)(p-ZMO)was obtained using solvent of ethylene glycol,and the microsphere-shaped ZnMn2O_(4)(m-ZMO)was obtained using water.During electrochemical testing,the p-ZMO anode delivered larger charge capacity of 726 mAh g^(-1) at 0.2 Ag^(-1) than 589 mAh g^(-1) of m-ZMO.Even over 1000 cycles at 1 Ag^(-1),the p-ZMO still maintained a reversible capacity of 506 mAh g^(-1)(much higher than 372 mAh g^(-1) of graphite anode),with a superior retention of 84%.It indicates that this work develops an effective strategy to prepare high-performance transition metal oxides for anode materials of lithium-ion batteries.