This study proposes a novel and sustainable method for fabricating 3D-printed carbon-based electrodes for electrochemical wastewater treatment.We prepared B,N-doped carbon electrodes with hierarchical porosity and a s...This study proposes a novel and sustainable method for fabricating 3D-printed carbon-based electrodes for electrochemical wastewater treatment.We prepared B,N-doped carbon electrodes with hierarchical porosity and a significantly enhanced surface area-to-volume ratio(up to 180%)compared to non-optimized analogues using a synergistic combination of 3D printing,phase inversion,and microwave plasma-enhanced chemical vapor deposition.This process allows the metal-free growth of vertically aligned carbon nanostructures directly onto polymer-derived substrates,resulting in a 20-fold increase in the electrochemically active surface area.Computational fluid dynamics simulations were used to improve mass transport and reduce pressure drop.Electrochemical characterization demonstrated that the optimized electrodes performed significantly better,achieving 4.7-,4-,and 6.5-fold increases in the degradation rates of atenolol,metoprolol,and propranolol,respectively,during electrochemical oxidation.These results highlight the efficacy of the integrated fabrication and simulation approach in producing high-performance electrodes for sustainable wastewater treatment applications.展开更多
High temperature superconductor research is presently concentrated upon the flux pinning properties of the Abrikosov lattice of the mixed-mode superconducting phase. The temperature thermal fluctuations, current and m...High temperature superconductor research is presently concentrated upon the flux pinning properties of the Abrikosov lattice of the mixed-mode superconducting phase. The temperature thermal fluctuations, current and magnetic field unpin the flux vortices and so cause electromagnetic resistivity in high temperature superconductors. Materials with higher vortex pinning exhibit less resistivity and are more attractive for industrial uses. In the present article, we measured and correlated the pinning flux energy barrier, determined by AC magnetic measurements, and transmission electron microscopy measurements to the critical current Jc in Yttrium- and Silver-doped MgB2 superconductors. The energy of the flux vortex was evaluated as a function of the magnetic field. The energy barrier curves suggest an optimal doping level to occur in doped materials. This result only depends on the optimal size and distribution of precipitates, and not on their chemical composition. The energy barriers have been compared with that of undoped MgB2 in literature.展开更多
基金the National Science Centre,Poland,under the Agreement 2022/45/B/ST8/02847 is acknowledged(M.P.).
文摘This study proposes a novel and sustainable method for fabricating 3D-printed carbon-based electrodes for electrochemical wastewater treatment.We prepared B,N-doped carbon electrodes with hierarchical porosity and a significantly enhanced surface area-to-volume ratio(up to 180%)compared to non-optimized analogues using a synergistic combination of 3D printing,phase inversion,and microwave plasma-enhanced chemical vapor deposition.This process allows the metal-free growth of vertically aligned carbon nanostructures directly onto polymer-derived substrates,resulting in a 20-fold increase in the electrochemically active surface area.Computational fluid dynamics simulations were used to improve mass transport and reduce pressure drop.Electrochemical characterization demonstrated that the optimized electrodes performed significantly better,achieving 4.7-,4-,and 6.5-fold increases in the degradation rates of atenolol,metoprolol,and propranolol,respectively,during electrochemical oxidation.These results highlight the efficacy of the integrated fabrication and simulation approach in producing high-performance electrodes for sustainable wastewater treatment applications.
文摘High temperature superconductor research is presently concentrated upon the flux pinning properties of the Abrikosov lattice of the mixed-mode superconducting phase. The temperature thermal fluctuations, current and magnetic field unpin the flux vortices and so cause electromagnetic resistivity in high temperature superconductors. Materials with higher vortex pinning exhibit less resistivity and are more attractive for industrial uses. In the present article, we measured and correlated the pinning flux energy barrier, determined by AC magnetic measurements, and transmission electron microscopy measurements to the critical current Jc in Yttrium- and Silver-doped MgB2 superconductors. The energy of the flux vortex was evaluated as a function of the magnetic field. The energy barrier curves suggest an optimal doping level to occur in doped materials. This result only depends on the optimal size and distribution of precipitates, and not on their chemical composition. The energy barriers have been compared with that of undoped MgB2 in literature.
