Results 31 to 40 of about 1,235 (143)

Theoretical Study on Bonding and Catalytic Properties of N-heterocyclic Carbenes and Aluminum Carbenoids [PDF]

open access: yes, 2016
氮杂环卡宾(N-heterocycliccarbene,NHC)中sp2杂化的卡宾碳具有独特的σ2π0电子结构,表现出较强的σ给电子能力和一定的π电子接受能力。作为σ型的配体,NHC可以与过渡金属(Transitionmetal,TM)原子相互作用形成σ-型配合物,并导致过渡金属中心呈现出富电子特征,使其在催化反应中具有较高的反应活性。强亲核性的NHC进攻醛,可以使其由亲电试剂反转为亲核试剂,所产生的Breslow中间体具有较高的反应活性,能与多种亲电试剂发生丰富的化学反应。当醛上具有不饱和共轭链时 ...
张向飞
core  

Bimetallic Mo/Fe‐Doped CoP2 Nanoleaf Array as a Bifunctional Electrocatalyst for Overall Water Splitting

open access: yesRare Metals, EarlyView.
ABSTRACT The development of efficient and stable bifunctional catalysts remains a key challenge for green hydrogen production via electrochemical water splitting. In this study, a bimetallic Mo/Fe‐doped CoP2 nanoleaf array anchored on carbon cloth (Mo, Fe‐CoP2@CC) was synthesized from zeolitic imidazolate framework‐L (ZIF‐L) via an ion‐exchange and low‐
Xiangqun Zeng   +6 more
wiley   +1 more source

First-principles studies of monolayer MoS2-based hybrid systems [PDF]

open access: yes, 2015
自从2004年石墨烯问世以来,它凭借其自身优异的物理化学性能已成为凝聚态物理,半导体材料,生物医学,化学以及能源等领域的研究热点。近几年随着石墨烯材料在锂离子电池,传感器,半导体光电器件上的成功应用,类石墨烯二维纳米材料的研究也逐渐受到了人们的广泛关注。其中二维层状过渡金属硫化物二硫化钼被认为是极具潜力的石墨烯替代物。单层二硫化钼除了与石墨烯一样具备极佳的导电性能和超强的硬度外,该材料还具备发光性。此外,单层二硫化钼本身具有直接带隙,能够克服石墨烯,硅烯,锗烯等二维材料零带隙的缺陷。而且,近期有研究显示,
李小丹
core  

In Situ Fabrication of Sulfate‐Grafted Mo‐Doped NiOOH for Electrocatalytic Methanol Oxidation Coupled With Hydrogen Production at Industrial‐Level Current Density

open access: yesRare Metals, Volume 45, Issue 1, January 2026.
ABSTRACT Developing efficient and sustainable energy conversion technologies is crucial for addressing the global energy and environmental challenges. As a promising clean energy conversion strategy, the electrocatalytic methanol oxidation coupled with cathodic hydrogen production provides a pivotal path to solve the above problems.
Tao Chen   +4 more
wiley   +1 more source

基于密度泛函理论的油中溶解气体拉曼特征频谱分析

open access: yesGaoya dianqi, 2017
为了准确获取电力变压器的运行状态,对其进行有效的维护,文中针对7种变压器故障气体的拉曼特征频谱选择,建立了基于密度泛函理论(DFT)中B3LYP方法的气体分子构型优化和拉曼频移特征仿真分析,并结合搭建的拉曼实验平台;对相等含量的7种故障气体完成拉曼检测,结合密度泛函理论与实际检测,确定7种故障气体H2、CH4、C2H6、C2H4、C2H2、CO、CO2的特征拉曼频移分别为:4 155、2 924、2 954、1 346、1 976、2 142、1 390 cm-1 ...
陈新岗   +6 more
doaj  

Immobilization of palladium on glutaraldehyde chemical modified chitosan fiber mat and its catalytic performance(戊二醛改性交联壳聚糖纳米纤维膜负载钯催化剂的制备及其催化性能研究)

open access: yesZhejiang Daxue xuebao. Lixue ban, 2017
以壳聚糖(CS)为基体聚合物、聚甲基丙烯酸(PMAA)为共纺聚合物,通过静电纺丝和热交联技术制备了具有良好形貌和稳定性的交联壳聚糖/聚甲基丙烯酸(CS/PMAA)纳米纤维膜,然后采用戊二醛对纤维进行化学改性后用于负载钯催化剂.采用扫描电镜(SEM)表征纤维膜的微观结构;通过扫描电子显微镜-能谱仪(SEM-EDS)和X-射线衍射仪(XRD)分析钯催化中心在纤维膜上的分布;采用红外光谱(FT-IR)表征戊二醛改性后纤维膜的化学结构变化;利用密度泛函理论(DFT ...
WANGZining(王子宁)   +4 more
doaj   +1 more source

A Dual Closed‐Loop Process to Recycle High Nickel Cathode of Spent Lithium‐Ion Batteries via Deep Eutectic Solvents: Computational Screening and Experimental Validation

open access: yesRare Metals, Volume 45, Issue 1, January 2026.
ABSTRACT Deep eutectic solvents (DESs) have displayed a significant potential in green recycling of spent lithium‐ion batteries (LIBs) cathode materials. In this study, we proposed a computational screening strategy based on the binding energy and hydrogen bonding performance via density functional theory and molecular dynamic calculation, achieving a ...
Yang Chen   +7 more
wiley   +1 more source

基于傅里叶红外光谱技术的C4F7N/CO2检测

open access: yesGaoya dianqi, 2021
目前广泛使用的绝缘介质SF6产生的温室效应与电力系统对环境友好的要求相矛盾。近期,环保型绝缘介质C4F7N-CO2混合气体被认为具有良好的工程应用前景。由于混合气体的绝缘性能与C4F7N的含量及气体压力密切相关,未来工程应用中的充换气及运维等均需要对混合气体中C4F7N的含量进行检测,以确定混合气体的实际体积分数,目前鲜有针对混合气体中C4F7N体积分数的定量检测技术的相关报道。文中基于密度泛函理论对C4F7N进行了分子构型与频谱优化,得到其红外仿真图;基于傅里叶红外光谱技术(FITR ...
马勇   +6 more
doaj  

Electronic structures of high voltage cathode material Li1-xCoO2 (x = 0.75) [PDF]

open access: yes, 2016
在经济的高速发展以及对能源的迫切需求的驱动下,新型清洁能源已经成为了21世纪人类社会发展的发展焦点。在这样的背景下,锂离子电池的开发和应用备受社会各界的广泛关注,锂离子电池的应用已经给生活和生产各方面带来的极大的便捷,从最初的移动通讯设备扩展到各种便携式电子产品,甚至在航空航天、军事上都能看到其应用。正是这些方面的需求促进锂离子进一步的发展,则锂离子电池为了能够更好的满足以上这些方面的发展要求,不仅要在能量密度和循环性能取得更大的突破,更是不能忽略安全性方面的要求。因此 ...
林妹
core  

High‐Performance Sodium‐Ion Capacitors With Kinetics‐Matched Characteristics Enabled by N/O/S‐Doped Homologous Carbon Electrodes Derived From a Single Precursor

open access: yesRare Metals, Volume 45, Issue 1, January 2026.
ABSTRACT Sodium‐ion capacitors (SICs) offer high energy and power density with long cycle life, but developing kinetically compatible electrodes remains challenging. This work developed a simple and sustainable strategy to synthesize homologous carbon electrodes from the inner shells of durian husks (ISDH) for high‐performance SICs.
De‐Bing Yan   +7 more
wiley   +1 more source

Home - About - Disclaimer - Privacy