Advancing hydrogen-based technologies requires detailed characterization of hydrogen chemical states in amorphous materials.As experimental probing of hydrogen is challenging,interpretation in amorphous systems demand...Advancing hydrogen-based technologies requires detailed characterization of hydrogen chemical states in amorphous materials.As experimental probing of hydrogen is challenging,interpretation in amorphous systems demands accurate structural models.Guided by experiments on atomic layer deposited alumina,a fast atomistic simulation technique is introduced using an ab initio-based machine learning interatomic potential to generate amorphous structures with realistic hydrogen contents.As such,the annealing of highly defective crystalline hydroxide structures at atomic layer deposition temperatures reproduces experimental density and structure,enabling accurate prediction of Al Auger parameter chemical shifts.Our analysis shows that higher hydrogen content favors OH ligands,whereas lower hydrogen content leads to diverse chemical states and hydrogen bonding,consistent with charge density and partial Bader charge calculations.Our approach offers a robust route to link hydrogen content with experimentally accessible chemical shifts,aiding the design of next-generation hydrogen-related materials.展开更多
The crystal habit,crystalline structure,surface condition and composition of the ultrafine Al particles prepared by inert gas evaporation method were studied in detail by means of high resolution transmission electron...The crystal habit,crystalline structure,surface condition and composition of the ultrafine Al particles prepared by inert gas evaporation method were studied in detail by means of high resolution transmission electron microscope,X-ray diffraction and X-ray photo-electron spectrum.The results indicate that the ultrafine Al particles prepared in high pure inert gas are of clear crystal habits,single crystal in a large majority and fcc crystalline structure with a_0=0.405 nm.It is also found on the surface of the Al particles that there is a layer of amor- phous Al_2O_3 with 2 nm average thickness,which could protect the particles against oxidizing further.Therefore,the ultrafine Al particles prepared by the inert gas evaporation method are very stable in atmosphere.展开更多
基金supported by NCCR MARVEL, a National Centre of Competence in Research, funded by the Swiss National Science Foundation (grant number 205602)We acknowledge financial support from the Swiss National Science Foundation (R'Equip program, Proposal No. 206021\_182987)+1 种基金This work has been partially supported by MIAI@Grenoble Alpes (ANR-19-P3IA-0003)Discussions within the French collaborative network in artificial intelligence in materials science GDR CNRS 2123 (IAMAT) are also acknowledged.
文摘Advancing hydrogen-based technologies requires detailed characterization of hydrogen chemical states in amorphous materials.As experimental probing of hydrogen is challenging,interpretation in amorphous systems demands accurate structural models.Guided by experiments on atomic layer deposited alumina,a fast atomistic simulation technique is introduced using an ab initio-based machine learning interatomic potential to generate amorphous structures with realistic hydrogen contents.As such,the annealing of highly defective crystalline hydroxide structures at atomic layer deposition temperatures reproduces experimental density and structure,enabling accurate prediction of Al Auger parameter chemical shifts.Our analysis shows that higher hydrogen content favors OH ligands,whereas lower hydrogen content leads to diverse chemical states and hydrogen bonding,consistent with charge density and partial Bader charge calculations.Our approach offers a robust route to link hydrogen content with experimentally accessible chemical shifts,aiding the design of next-generation hydrogen-related materials.
文摘The crystal habit,crystalline structure,surface condition and composition of the ultrafine Al particles prepared by inert gas evaporation method were studied in detail by means of high resolution transmission electron microscope,X-ray diffraction and X-ray photo-electron spectrum.The results indicate that the ultrafine Al particles prepared in high pure inert gas are of clear crystal habits,single crystal in a large majority and fcc crystalline structure with a_0=0.405 nm.It is also found on the surface of the Al particles that there is a layer of amor- phous Al_2O_3 with 2 nm average thickness,which could protect the particles against oxidizing further.Therefore,the ultrafine Al particles prepared by the inert gas evaporation method are very stable in atmosphere.
