Recent advancements in thermal conductivity modulating strategies have shown promising enhancements to the thermal management capabilities of two-dimensional materials.In this article,both the iterative Boltzmann tran...Recent advancements in thermal conductivity modulating strategies have shown promising enhancements to the thermal management capabilities of two-dimensional materials.In this article,both the iterative Boltzmann transport equation solution and the two-temperature model were employed to investigate the efficacy of targeted phonon excitation applied to hexagonal boron nitride(hBN).The results indicate significant modifications to hBN's thermal conductivity,achieving increases of up to 30.1%as well as decreases of up to 59.8%.These findings validate the reliability of the strategy,expand its scope of applicability,and establish it as a powerful tool for tailoring thermal properties across a wider range of fields.展开更多
The catalytic activity of an electrocatalyst is determined by the density of active sites and the electric conductivity,namely,the density of electrically connected active sites.In this work,elemental incorporation,di...The catalytic activity of an electrocatalyst is determined by the density of active sites and the electric conductivity,namely,the density of electrically connected active sites.In this work,elemental incorporation,disorder engineering and material hybridization were applied to molybdenum disulfide(MoS2)simultaneously to realize a high-level synergistic optimization for both active sites and electric conductivity,achieving highly efficient hydrogen-evolving performance finally.Benefitting from the synergistic optimization,the vertically aligned oxygen-doped MoS_(2)/carbon cloth catalyst shows an ultralow onset overpotential of 90 mV to initiate the HER process,and an extremely high catalytic current of 225 mA cm^(-2) was measured at an overpotential of 300 mV.Not only that,superior stability was also achieved,making this novel catalyst promising for practical applications such as electrolytic water splitting and a co-catalyst for photocatalytic/photoelectrochemical hydrogen production.The synergistic optimization strategy reported in this work would shed light on the systematic design of highly efficient electrocatalysts in the future.展开更多
基金supported by the National Key Research and Development Project of China(Grant No.2018YFE0127800)。
文摘Recent advancements in thermal conductivity modulating strategies have shown promising enhancements to the thermal management capabilities of two-dimensional materials.In this article,both the iterative Boltzmann transport equation solution and the two-temperature model were employed to investigate the efficacy of targeted phonon excitation applied to hexagonal boron nitride(hBN).The results indicate significant modifications to hBN's thermal conductivity,achieving increases of up to 30.1%as well as decreases of up to 59.8%.These findings validate the reliability of the strategy,expand its scope of applicability,and establish it as a powerful tool for tailoring thermal properties across a wider range of fields.
基金financially supported by the 973 Program(2013CB933800)the National Natural Science Foundation of China(21501112,21535004,21227005,21390411)the Natural Science Foundation of Shandong Province(ZR2014BQ007).
文摘The catalytic activity of an electrocatalyst is determined by the density of active sites and the electric conductivity,namely,the density of electrically connected active sites.In this work,elemental incorporation,disorder engineering and material hybridization were applied to molybdenum disulfide(MoS2)simultaneously to realize a high-level synergistic optimization for both active sites and electric conductivity,achieving highly efficient hydrogen-evolving performance finally.Benefitting from the synergistic optimization,the vertically aligned oxygen-doped MoS_(2)/carbon cloth catalyst shows an ultralow onset overpotential of 90 mV to initiate the HER process,and an extremely high catalytic current of 225 mA cm^(-2) was measured at an overpotential of 300 mV.Not only that,superior stability was also achieved,making this novel catalyst promising for practical applications such as electrolytic water splitting and a co-catalyst for photocatalytic/photoelectrochemical hydrogen production.The synergistic optimization strategy reported in this work would shed light on the systematic design of highly efficient electrocatalysts in the future.
