Hydrogen storage and delivery technology is still a bottleneck in the hydrogen industry chain.Among all kinds of hydrogen storage methods,light-weight solid-state hydrogen storage(LSHS)materials could become promising...Hydrogen storage and delivery technology is still a bottleneck in the hydrogen industry chain.Among all kinds of hydrogen storage methods,light-weight solid-state hydrogen storage(LSHS)materials could become promising due to its intrinsic high hydrogen capacity.Hydrolysis reaction of LSHS materials occurs at moderate conditions,indicating the potential for portable applications.At present,most of review work focuses on the improvement of material performance,especially the catalysts design.This part is important,but the others,such as operation modes,are also vital to to make full use of material potential in the practical applications.Different operation modes of hydrolysis reaction have an impact on hydrogen capacity to various degrees.For example,hydrolysis in solution would decrease the hydrogen capacity of hydrogen generator to a low value due to the excessive water participating in the reaction.Therefore,application-oriented operation modes could become a key problem for hydrolysis reaction of LSHS materials.In this paper,the operation modes of hydrolysis reaction and their practical applications are mainly reviewed.The implements of each operation mode are discussed and compared in detail to determine the suitable one for practical applications with the requirement of high energy density.The current challenges and future directions are also discussed.展开更多
Narrow linewidth stabilized lasers are central to precision applications that operate across the visible to short-wave infrared wavelengths,including optical clocks,quantum sensing and computing,ultra-low noise microw...Narrow linewidth stabilized lasers are central to precision applications that operate across the visible to short-wave infrared wavelengths,including optical clocks,quantum sensing and computing,ultra-low noise microwave generation,and fiber sensing.Today,these spectrally pure sources are realized using multiple external cavity tabletop lasers locked to bulk-optic free-space reference cavities.Integration of this technology will enable portable precision applications with improved reliability and robustness.Here,we report wavelength-flexible design and operation,over more than an octave span,of an integrated coil-resonator-stabilized Brillouin laser architecture.Leveraging a versatile two-stage noise reduction approach,we achieve low linewidths and high stability with chip-scale laser designs based on the ultra-low-loss,CMOS-compatible silicon nitride platform.We report operation at 674 and 698 nm for applications to strontium neutral and trapped-ion clocks,quantum sensing and computing,and at 1550 nm for applications to fiber sensing and ultra-low phase noise microwave generation.Over this range we demonstrate frequency noise reduction from 1 to 10 MHz resulting in 1.0-17 Hz fundamental and 181-630 Hz integral linewidths and an Allan deviation of 6.5×10^(-13)at 1ms for 674 nm,6.0×10^(-13)at 15ms for 698 nm,and 2.6×10^(-13)at 15 ms for 1550 nm.This work demonstrates the lowest fundamental and integral linewidths and highest stability achieved to date for stabilized Brillouin lasers with integrated coil-resonator references,with over an order of magnitude improvement in the visible wavelength range.These results unlock the potential of integrated,ultra-low-phase-noise stabilized lasers for precision applications and further integration in systems-on-chip solutions.展开更多
基金financially supported by the National Key R&D Program of China(2022YFE0101300)the National Natural Science Foundation of China(52176203 and 52050027)the China Education Association for International Exchange(202006)。
文摘Hydrogen storage and delivery technology is still a bottleneck in the hydrogen industry chain.Among all kinds of hydrogen storage methods,light-weight solid-state hydrogen storage(LSHS)materials could become promising due to its intrinsic high hydrogen capacity.Hydrolysis reaction of LSHS materials occurs at moderate conditions,indicating the potential for portable applications.At present,most of review work focuses on the improvement of material performance,especially the catalysts design.This part is important,but the others,such as operation modes,are also vital to to make full use of material potential in the practical applications.Different operation modes of hydrolysis reaction have an impact on hydrogen capacity to various degrees.For example,hydrolysis in solution would decrease the hydrogen capacity of hydrogen generator to a low value due to the excessive water participating in the reaction.Therefore,application-oriented operation modes could become a key problem for hydrolysis reaction of LSHS materials.In this paper,the operation modes of hydrolysis reaction and their practical applications are mainly reviewed.The implements of each operation mode are discussed and compared in detail to determine the suitable one for practical applications with the requirement of high energy density.The current challenges and future directions are also discussed.
基金supported by DARPA GRYPHON,under Award Number HR0011-22-2-0008by the U.S.Army Research Office under contract/grant number W911NF2310179+1 种基金by the NSF under Award Number 2016244by a gift from Thorlabs.
文摘Narrow linewidth stabilized lasers are central to precision applications that operate across the visible to short-wave infrared wavelengths,including optical clocks,quantum sensing and computing,ultra-low noise microwave generation,and fiber sensing.Today,these spectrally pure sources are realized using multiple external cavity tabletop lasers locked to bulk-optic free-space reference cavities.Integration of this technology will enable portable precision applications with improved reliability and robustness.Here,we report wavelength-flexible design and operation,over more than an octave span,of an integrated coil-resonator-stabilized Brillouin laser architecture.Leveraging a versatile two-stage noise reduction approach,we achieve low linewidths and high stability with chip-scale laser designs based on the ultra-low-loss,CMOS-compatible silicon nitride platform.We report operation at 674 and 698 nm for applications to strontium neutral and trapped-ion clocks,quantum sensing and computing,and at 1550 nm for applications to fiber sensing and ultra-low phase noise microwave generation.Over this range we demonstrate frequency noise reduction from 1 to 10 MHz resulting in 1.0-17 Hz fundamental and 181-630 Hz integral linewidths and an Allan deviation of 6.5×10^(-13)at 1ms for 674 nm,6.0×10^(-13)at 15ms for 698 nm,and 2.6×10^(-13)at 15 ms for 1550 nm.This work demonstrates the lowest fundamental and integral linewidths and highest stability achieved to date for stabilized Brillouin lasers with integrated coil-resonator references,with over an order of magnitude improvement in the visible wavelength range.These results unlock the potential of integrated,ultra-low-phase-noise stabilized lasers for precision applications and further integration in systems-on-chip solutions.
