了解磁结构对于深入探究磁性材料中的磁行为及其相关现象具有至关重要的意义。四维扫描透射电子显微镜(four⁃dimensional scanning transmission electron microscopy,4D⁃STEM)技术的出现,为定量分析磁场提供了一种全新的技术手段,特别...了解磁结构对于深入探究磁性材料中的磁行为及其相关现象具有至关重要的意义。四维扫描透射电子显微镜(four⁃dimensional scanning transmission electron microscopy,4D⁃STEM)技术的出现,为定量分析磁场提供了一种全新的技术手段,特别是通过精确定位衍射盘的位置,来解析磁场在纳米尺度上的分布情况。本文介绍了一款集成了多种衍射盘定位算法的Python程序包,并通过对实验数据的分析,探讨了该程序包中核心算法的性能及其适用场景。展开更多
Developing nanoporous high-entropy metallic glass(HEMG)with a high specific surface area presents a promising approach to develop a cost-effective and efficient catalyst,which utilize the synergistic effect of its mul...Developing nanoporous high-entropy metallic glass(HEMG)with a high specific surface area presents a promising approach to develop a cost-effective and efficient catalyst,which utilize the synergistic effect of its multi-component composition and the adjustable atomic environment of its disordered structure.However,the glassy structure invariably gets erased due to the inevitable crystallization during the nanoporous construction procedure through dealloying.Here,an innovative HEMG with an endogenetic nano-scale phase-separated structure is specially designed to maintain a fully glassy state throughout the nanoporous construction procedure.Consequently,an amorphous/crystalline heterostructure(ACH)—nanocrystal flakes embedded in amorphous ligaments—is intentionally constructed,which exhibits significant lattice distortion at amorphous/crystalline interfaces,resulting in high density of active sites.The ACH facilitates intermediate adsorption by promoting directional charge transfer between amorphous and crystalline phases and improves product desorption through downshifting the d-band center.This results in remarkable electrolysis performance,requiring only a 1.53 V potential to achieve a current density of 10 mA cm^(−2)for overall water-splitting in an alkaline electrolyte,surpassing that of commercial Pt/C||IrO_(2)catalysts of 1.62 V.This research pioneers strategies to refine the composition,atomic structure,and electron characteristics of HEMG,unlocking new functional applications.展开更多
文摘了解磁结构对于深入探究磁性材料中的磁行为及其相关现象具有至关重要的意义。四维扫描透射电子显微镜(four⁃dimensional scanning transmission electron microscopy,4D⁃STEM)技术的出现,为定量分析磁场提供了一种全新的技术手段,特别是通过精确定位衍射盘的位置,来解析磁场在纳米尺度上的分布情况。本文介绍了一款集成了多种衍射盘定位算法的Python程序包,并通过对实验数据的分析,探讨了该程序包中核心算法的性能及其适用场景。
基金supported by the National Key R&D Program of China(Grant Number 2021YFB3802900)the National Natural Science Foundation of China(Grant Numbers 52192600,52192604,52371166 and 62104131)+3 种基金the Higher Educational Youth Innovation Science and Technology Program Shandong Province(2021KJ022)Taishan Scholars Program(tsqn201909107)Natural Science Foundation of Shandong Province(ZR2020QF077)supported by the Center for Materials Genome and the Synergetic Extreme Condition User Facility(SECUF).
文摘Developing nanoporous high-entropy metallic glass(HEMG)with a high specific surface area presents a promising approach to develop a cost-effective and efficient catalyst,which utilize the synergistic effect of its multi-component composition and the adjustable atomic environment of its disordered structure.However,the glassy structure invariably gets erased due to the inevitable crystallization during the nanoporous construction procedure through dealloying.Here,an innovative HEMG with an endogenetic nano-scale phase-separated structure is specially designed to maintain a fully glassy state throughout the nanoporous construction procedure.Consequently,an amorphous/crystalline heterostructure(ACH)—nanocrystal flakes embedded in amorphous ligaments—is intentionally constructed,which exhibits significant lattice distortion at amorphous/crystalline interfaces,resulting in high density of active sites.The ACH facilitates intermediate adsorption by promoting directional charge transfer between amorphous and crystalline phases and improves product desorption through downshifting the d-band center.This results in remarkable electrolysis performance,requiring only a 1.53 V potential to achieve a current density of 10 mA cm^(−2)for overall water-splitting in an alkaline electrolyte,surpassing that of commercial Pt/C||IrO_(2)catalysts of 1.62 V.This research pioneers strategies to refine the composition,atomic structure,and electron characteristics of HEMG,unlocking new functional applications.
