A novel porous PbO2-ZrO2 nanocomposite electrode was successfully prepared by bubbles template composite electrodeposition methods for the first time. Scanning electronic microscopy (SEM) and X-ray diffraction (XRD) results show that the novel porous PbO2-ZrO2 nanocomposite electrodes have the three-dimensional porous structure and smaller crystal sizes than planar PbO2-ZrO2 nanocomposite electrodes. ZrO2 nanoparticles can be observed on the electrodes. The cyclic voltammetry measurement show that the electrochemical active surface area of porous PbO2-ZrO2 nanocomposite electrodes is 3 times than that of planar PbO2-ZrO2 electrodes. In the electrocatalytic oxidization process of crystal violet, the color and COD removal efficiency on the porous composite electrodes is 99.8% and 69.2% after 90 min. The degradation process follows pseudo-first-order kinetics. The rate constant for porous composite electrodes can reach 0.04916 min−1, which is 4.5 times than that for planar composite electrodes (0.01188 min−1). Moreover, the three-dimensional porous structure can enhance the generation capacity of hydroxyl radicals. The experiment results illustrate that the porous PbO2-ZrO2 nanocomposite electrodes have a great application potential in the pollutant degradation fields.
Intermittent or serrated plastic flows have been widely observed in irreversible deformation through shear banding in bulk metallic glasses (BMGs). The strain-rate-dependent plasticity under uniaxial compression at 2 9 10 À3 , 2 9 10 À4 , and 2 9 10 À5 s À1 in a Zr-based BMG is investigated. Serration events have a typical time scale at a relatively higher strain rate (2 9 10 À3 s À1 ), while at lower strain rates, there is a lack of typical time scale. During serrations, the stress is falling rapidly, and the amplitude of the stress drop between the neighboring serrations is approximately equal. The stress drop vs time satisfies the exponential decay rule during jerk flows. Due to the serrated flow corresponding to the internal shear process, the freevolume model and stick-slip model are introduced to explain how the shear bands form and propagate and the cooperation of multiple shear bands. The mechanism is explained by relating the atomic-scale deformation with the macroscopic shear-band behavior, offering key ingredients to fundamentally cognize serrations in jerk flows.
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