In this study, Co/Cu-decorated carbon nanofibers are introduced as novel electrocatalyst for methanol oxidation. The introduced nanofibers have been prepared based on graphitization of poly(vinyl alcohol) which has high carbon content compared to many polymer precursors for carbon nanofiber synthesis. Typically, calcination in argon atmosphere of electrospun nanofibers composed of cobalt acetat...

The effect of vacuum annealing on local structure reconstruction, evolution of photoluminescence PL and paramagnetic defects in carbon-rich a-Si1−xCx :H films x=0.7 was studied. Strong enhancement of visible white-green PL was observed after annealing in the temperature range of 400–500 °C. Such enhancement was correlated with increasing of the concentration of carbon-hydrogen bonds in Si:CuHn ...

A dynamic computational model developed within the context of the classical theory of phase evolution is applied to the W–C system to simulate the kinetics of graphite nucleation during non-equilibrium peritectic melting of WC. The kinetic variables used in the model are obtained directly from the free energy formulations that characterize the stable and metastable equilibria between WC, liquid...

A line for preparation of graphite targets for accelerator mass spectrometry (AMS) radiocarbon dating has been built in the Gliwice 14C Laboratory. The AMS 14C measurements of our targets are performed in the Leibniz-Labor für Altersbestimmung, Kiel, Germany. The quality of our line has been tested in two series of AMS 14C measurements of background and Ox-II standard samples and by measurement...

MOF–derived porous carbon is a type of promising catalyst to replace expensive Pt–based catalysts for oxygen reduction reaction (ORR). The catalytic activity ORR depends closely on pyrolysis conditions. In this work, Co–doped ZIF–8 material was chosen as research object. effect conditions (temperature, heating rate, two–step heating) the performance ZIF–derived systematically studied. Co–ZIF–8 ...

Diamond tools are known to wear rapidly during the machining of ferrous materials because catalytic effect iron on diamond graphitization. This work aims perform a relative comparison mitigation efficacy candidate two-dimensional (2D) materials, viz., graphene oxide (GO), hexagonal boron nitride (hBN), molybdenum disulfide (MoS2) and tungsten (WS2), when used as cutting fluid additives turning ...

The mechanical and tribological properties of three types diamond like carbon (DLC) coatings, i.e., non-doped, Si-doped, W-doped DLC, are evaluated. Dry reciprocating sliding wear tests were performed to evaluate the effect frequency/velocity on friction, adhesion, wear. degree graphitization non-doped DLC increases with velocity, which results in a lower coefficient friction (COF), decrease ra...