Results 21 to 30 of about 1,280 (148)

Acid‐Etched Co‐Vacancy‐Tunable CoFeP/N,P‐Codoped Carbon Nanocages for Highly Efficient Alkaline Water Electrolysis

open access: yesRare Metals, Volume 45, Issue 3, March 2026.
ABSTRACT Efficient and durable bifunctional electrocatalysts are vital for scalable water electrolysis. Here, we realize cobalt‐vacancy (Covac) engineering in CoFeP supported on N,P‐codoped carbon nanocages (Co1‐vacFeP/NPC) through a simple route comprising a CoFe Prussian blue analog precursor, phosphidation–pyrolysis, tannic‐acid etching, and a ...
Yuan‐Liang Yuan   +6 more
wiley   +1 more source

Density functional theory study on 1-substituted-2-hydroxyaminobenzimidazole derivatives(1-取代-2-羟氨苯并咪唑衍生物的密度泛函理论计算)

open access: yesZhejiang Daxue xuebao. Lixue ban, 2011
1-取代-2-羟氨苯并咪唑类化合物是1-取代-2-氨基苯并咪唑衍生物氧化代谢产生的具有强毒性的不稳定中间体.本文运用密度泛函理论(DFT)量子化学方法,计算得到了8种1-取代-2-羟氨苯并咪唑衍生物的电子结构性质.结果表明,取代基团的引入使咪唑环上C—N键长发生明显改变,N原子上负电荷减少;取代基团的引入对偶极矩、垂直电离势、垂直电子亲合能、化学势、电负性和亲电性等都有较为显著的影响,这些电子结构性质与化合物的毒性息息相关.通过计算得到了吸收光谱数据,取代基团的引入使垂直激发能变大,谐振子强度明显减小 ...
XIEHu-jun(谢湖均)   +4 more
doaj   +1 more source

Theoretical calculation of cathode catalyst and electrolyte in lithium air battery [PDF]

open access: yes, 2016
随着电动汽车的快速发展,寻找和开发具有高能量密度的新型锂二次电池显得至关重要,锂空气电池是目前研究最为活跃的体系之一。采用量子化学为主的理论方法,有助于深入认识和理解锂空气电池电化学界面的一些关键科学问题。本文从理论计算的角度出发,开展对于锂空气电池的正极催化剂材料及电解液等关键组件的研究。主要研究内容如下: 1.MnO晶体的(100)、(111)-Mn和(111)-O晶面对锂空气电池充放电过电势影响的机理研究。 在N掺杂石墨烯(NG)表面上均匀生长MnO晶体,该复合材料表现出了优异的OER催化性能 ...
雷鸣
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Bimetallic Mo/Fe‐Doped CoP2 Nanoleaf Array as a Bifunctional Electrocatalyst for Overall Water Splitting

open access: yesRare Metals, Volume 45, Issue 3, March 2026.
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

Theoritical investigations of phase stability, elastic and thermodynamic properties of γ’ phase in Co-X (X:Al, V) based superalloys [PDF]

open access: yes, 2016
Ni基高温合金是航空航天领域应用最广的高温材料。随着国防科技的发展,新一代的航空航天飞机对发动机涡轮叶片材料的承温能力提出更高的要求。然而Ni基高温合金受熔点的限制,其服役温度很难进一步提高。寻找下一代高温合金成为国内外研究机构的关注焦点。最近,研究者们陆续在Co-Al基和Co-V基合金中发现与Ni3Al类似的γ’析出强化相,由此掀起了新型钴基高温合金的研究热潮。作为新型Co基高温合金中的关键强化相,γ’相的结构稳定性和弹性性质直接决定了Co基高温合金的综合力学性能 ...
邓斌
core  

Sodiumation of Biomass‐Derived Quinones Enables High‐Rate and Long‐Life Cathodes for Sodium‐Ion Batteries

open access: yesRare Metals, Volume 45, Issue 3, March 2026.
ABSTRACT Biomass‐derived quinones are promising green and sustainable cathode materials for sodium‐ion batteries (SIBs), yet their practical application is hindered by poor cycling stability due to dissolution in conventional electrolytes. Herein, we demonstrate that sodiumation is an effective strategy to enhance both rate capability and cycling ...
Xinyue Zhu   +4 more
wiley   +1 more source

Adsorption,Reactions and Raman Spectra of Water Molecules and Hydrated Species on Noble Metal Cathodes:A Theoretical Study [PDF]

open access: yes, 2016
水是自然界最常见的物质之一,也是生命赖以生存的物质基础。水与表面的相互作用一直是诸多学科广泛研究的领域。在电化学体系中,水分子是电极/溶液界面最重要的组分之一,水分子的构型和取向直接影响电极/溶液界面的电势分布以及微观化学环境,从而影响界面的电化学反应。同时,在电极/溶液界面还存在着许多寿命短,不稳定,同时又具有着较高的化学活性的表面物种。例如,不饱和氢键的水分子、质子化的水、水合氢原子、水合电子、以及水合氢氧根离子等。 贵金属纳米粒子催化剂有着得天独厚的光催化性能:大的表面积与体积比 ...
庞然
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Adaptive Crystallization of NiFe‐MIL‐55 Nanorods: Atomically Precise Shape Control and Dual‐Function Electrocatalytic Performance

open access: yesRare Metals, Volume 45, Issue 3, March 2026.
ABSTRACT NiFe‐based MIL‐55 metal‐organic frameworks (MOFs) face challenges in achieving atomically precise composition and reliable methods for uniform growth. This study addresses these challenges by applying a slow evaporation crystallization technique to crude colloidal MIL‐55 products from hydrothermal synthesis, resulting in highly uniform ...
H. R. Haris   +10 more
wiley   +1 more source

Water clip of hydrate of 2, 6-bis( benzimidazolyl) pyridine: Crystal structure, hydrogen bonding and DFT studies(水分子夹2,6-二(2-苯并咪唑基)吡啶水合物的晶体结构、氢键和DFT研究)

open access: yesZhejiang Daxue xuebao. Lixue ban, 2015
基于实验得到的单晶结构建立了理论计算的结构模型,旨在用计算结果揭示实验所获得结构的微观驱动力,即弱相互作用的重要模式.通过对实验结构的异构化处理,建立异构体模型并进行比对,可以给出实验结构在能量上的优势.采用密度泛函方法对BIPy的2种同晶异形体Ⅰ(实验获得的单晶结构)和Ⅱ(根据Ⅰ的结构设计的异构体)与水分子之间的氢键相互作用进行了计算.结果表明,BIPy-Ⅰ在能量上具有明显优势,进一步证明了水分子在水分子夹中更适合作为氢键的受体.虽然BIPy-Ⅱ构型也处于势能面上的稳定点,但是实验无法得到其单晶结构 ...
WANGXiaojing(王肖璟)   +3 more
doaj   +1 more source

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  

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