检索结果-内蒙古大学图书馆

cu-MOFs Derived Porous cu Nanoribbons with Strengthened Electric Filed for Selective cO₂ Electroreduction to c₂₊ Fuels

引用

ADVANcED ENERGY MATERIALS 2021年第42期11卷 2102447-2102447页

作者： Huo, Hang Wang, Jin Fan, Qikui Hu, Yanjing Yang, Jian Shenzhen Univ Coll Mat Sci & Engn Guangdong Res Ctr Interfacial Engn Funct Mat Shenzhen Key Lab Special Funct Mat Shenzhen 518060 Peoples R China Shenzhen Univ Coll Phys & Optoelect Engn Key Lab Optoelect Devices & Syst Shenzhen 518060 Peoples R China Harbin Inst Technol Sch Chem & Chem Engn MIIT Key Lab Crit Mat Technol New Energy Convers Harbin 150001 Heilongjiang Peoples R China

The electroreduction of carbon dioxide is a promising strategy to synthesize value-added feedstocks and realize carbon neutralization. copper catalysts are well-known to be active for selective electroreduction of cO2 to multicarbon products, although the role played by the surface architecture is not fully understood. Herein, mesoporous cu nanoribbons are constructed via in-situ electrochemical reduction of cu based metal organic frameworks for the highly selective synthesis of c2+ chemicals. With the mesoporous structure, a high c2+ Faradaic efficiency of 82.3% with a partial current density of 347.9 mA cm(-2) is achieved in a flow-cell electrolyzer. controlled electroreduction of cO2 with cu nanoribbons exhibited clearly greater selectivity towards c2+ products than cu nanoleaves and cu nanorods without porous structures. Finite difference time domain results indicate that the mesoporous structure can enhance the electric field on the catalyst surface, which increases the concentration of K+ and OH-, thus allowing the authors to promote cO2 reduction pathways towards c2+ products.

关键词： c (2+) chemicals cO (2) reduction concentrated K (+) and OH (-) electric field porous cu nanoribbons

来源：评论

学校读者我要写书评

暂无评论

Root-like c/Sic surface structure fabricated by the thermal and electrochemical corrosion for brazing to Nb

引用

cOMPOSITES PART B-ENGINEERING 2021年 218卷 108942-108942页

作者： Ba, Jin Ji, Xu Wang, Bin Li, Peixin Lin, Jinghuang Qi, Junlei cao, Jian Harbin Inst Technol State Key Lab Adv Welding & Joining Harbin 150001 Peoples R China

Root-like structure on c/Sic surface has been designed through selective corrosion to decrease the residual stress and then to optimize the microstructure when brazed to Nb. Thermal and electrochemical corrosion are conducted to diminish the Sic matrix and the interface between carbon fibers and Sic, respectively. The surface structure can be filled with brazing alloy characterized by the gradient layer of carbon fiber reinforced brazing alloy. compared with thermal corrosion, Sic particles and nano Ti5Si3 are uniformly dispersed throughout the gradient layer in electrochemical corrosion. The layer decreases the difference in property consequently to relieve the residual stress. In addition, the original reaction layer will be replaced by this layer, favorable for the increase in joining strength and fracture toughness. The brittle facture at the reaction layer in original joints can be transformed into the zig-zag path. The shear strength of joints with the thermal and electrochemical corrosion depth of 100 mu m increases to 151.6 MPa and 164.3 MPa, respectively, which is 77% and 92% higher than that of original joints.

关键词： Surface structure Fiber reinforcement c Sic composites Braze

来源：评论

学校读者我要写书评

暂无评论

Wafer-Scale Growth of Aligned c₆₀ Single crystals via Solution-Phase Epitaxy for High-Performance Transistors

引用

ADVANcED FUNcTIONAL MATERIALS 2021年第52期31卷 2105459-2105459页

作者： Lu, Zhengjun Deng, Wei Fang, Xiaochen Xiao, Jie Lu, Bei Zhang, Xinwei Pirzado, Azhar Ali Ayaz Jie, Jiansheng Zhang, Xiujuan Soochow Univ Inst Funct Nano & Soft Mat FUNSOM Jiangsu Key Lab Carbon Based Funct Mat & Devices Suzhou 215123 Jiangsu Peoples R China Soochow Univ Coll Chem Chem Engn & Mat Sci Sch Chem & Environm Engn Suzhou 215123 Jiangsu Peoples R China Univ Sindh Fac Engn & Technol Dept Elect Engn Jamshoro 76080 Sindh Pakistan Macau Univ Sci & Technol Macao Inst Mat Sci & Engn Taipa 999078 Macau Peoples R China

Fullerene (c-60) single crystals with exceptionally low defects and nearly perfect translational symmetry make them appealing in achieving high-performance n-type organic transistors. However, because of its natural 0D structure, control over continuous crystallization of c-60 over a large area is extremely challenging. Here, the authors report a solution-phase epitaxial approach for wafer-scale growth of continuously aligned c-60 single crystals. This method enables the rational control of the density of nucleation event at meniscus front by confining the size and shape of meniscus with a microchannel template. In this case, a single nucleus as seed crystal can be formed at the front of meniscus, and then epitaxial growth from the seed crystal occurs with continuous retreat of the meniscus. As a result, highly uniform c-60 single-crystal array with ultralow defect density is obtained on 2-inch substrate. Organic field-effect transistors made from the c-60 single-crystal array show a high average electron mobility of 2.17 cm(2) V-1 s(-1), along with a maximum mobility of 5.09 cm(2) V-1 s(-1), which is much superior to the c-60 polycrystalline film-based devices. This strategy opens new opportunities for the scalable fabrication of high-performance integrated devices based on organic crystals.

关键词： aligned structures c (60) single crystals large-area growth organic field-effect transistors solution-phase epitaxy

来源：评论

学校读者我要写书评

暂无评论

Preparation and characterization of c:Se nano-rods ablated on porous silicon

引用

OPTIK 2021年 239卷 166811-166811页

作者： Jwied, Duha H. Nayef, Uday M. Mutlak, Falah A. -H. Univ Technol Baghdad Dept Appl Sci Baghdad Iraq Univ Baghdad Coll Sci Baghdad Iraq

In this work, carbon:Selenium (c:Se) nanoparticles (NPs) are preparation by laser ablation at diverse laser energy 200, 400, 600,800 and 1000 mJ with 100 shots and laser wavelength 1064 nm then deposited on porous silicon (PS). PS are fabricated using electrochemical etching (EcE) method for p-type crystalline silicon (c-Si) wafers of (100) *** pattern of X-ray diffraction (XRD) showed the sample's *** of the Atomic force microscope (AFM) analysis an average diameter of 39.76 nm coordinated in a rod-like shape appears for c:Se NPs. UV-vis result displayed that the optical energy gap of the nanoparticles increases. The electrical properties such as barrier height (phi B) and ideality factor (n) of the Al/c:SeNPs/PS/Si/Al heterojunction were determined from the current density-voltage (J-V) measurements.

关键词： c Se nano-rods Laser ablation Porous silicon J-V characteristics

来源：评论

学校读者我要写书评

暂无评论

Long-term isothermal oxidation behavior of two industrial polycrystalline nickel base alloys in air at 700 °c-Evaluation of intergranular oxidation distribution and kinetic

引用

cORROSION ScIENcE 2021年 188卷 109500-109500页

作者： Malacarne, R. Mathieu, S. Aranda, L. Vilasi, M. Desgranges, c. Knittel, S. Univ Lorraine CNRS IJL F-54000 Nancy France Safran Tech Rue Jeunes BoisCS 80112 F-78772 Magny Les Harneaux France Safran Aircraft Engines Rue Henri Auguste Desbrueres F-91000 Evry France

chromia forming Alloy 718 and AD730TM have been submitted to isothermal long-term air exposure up to 10 000 h at 700 degrees c. The resulting very low specific mass gain led to consider two alternatives to determine the oxidation kinetics. Measurements of the external layer thickness and of the intergranular oxide amount were carried out on SEM micrographs evidencing the intergranular oxidation contribute around 30% to the total specific mass change. AD730TM with a thicker external scale and a higher amount of intergranular oxide showed a twofold faster oxidation rate than Alloy718. The results demonstrated the need of even longer tests.

关键词： A Superalloys c High-temperature oxidation c Grain boundaries oxidation

来源：评论

学校读者我要写书评

暂无评论

NbSe₂ Meets c₂N: A 2D-2D Heterostructure catalysts as Multifunctional Polysulfide Mediator in Ultra-Long-Life Lithium-Sulfur Batteries

引用

ADVANcED ENERGY MATERIALS 2021年第36期11卷 2101250-2101250页

作者： Yang, Dawei Liang, Zhifu Zhang, chaoqi Jacas Biendicho, Jordi Botifoll, Marc chiara Spadaro, Maria chen, Qiulin Li, Mengyao Ramon, Alberto Moghaddam, Ahmad Ostovari Llorca, Jordi Wang, Jiaao Ramon Morante, Joan Arbiol, Jordi chou, Shu-Lei cabot, Andreu Catalonia Inst Energy Res IREC St Adria Besos Barcelona 08930 Spain Univ Barcelona Dept Elect & Biomed Engn Barcelona 08028 Spain CSIC Catalan Inst Nanosci & Nanotechnol ICN2 Campus UAB Barcelona 08193 Spain BIST Campus UAB Barcelona 08193 Spain Xiamen Univ Coll Mat Fujian Key Lab Mat Genome State Key Lab Phys Chem Solid Surfaces Xiamen 361005 Peoples R China South Ural State Univ 76 Lenin Ave Chelyabinsk 454080 Russia Univ Politecn Cataluna Inst Energy Technol Dept Chem Engn Barcelona 08019 Spain Univ Politecn Cataluna Barcelona Res Ctr Multiscale Sci & Engn Barcelona 08019 Spain Univ Texas Austin Dept Chem Austin TX 78712 USA Univ Texas Austin Oden Inst Computat Engn & Sci Austin TX 78712 USA ICREA Pg Lluis Companys 23 Barcelona 08010 Spain Univ Wollongong Inst Superconducting & Elect Mat Innovat Campus North Wollongong NSW 2500 Australia

The shuttle effect and sluggish conversion kinetics of lithium polysulfides (LiPS) hamper the practical application of lithium-sulfur batteries (LSBs). Toward overcoming these limitations, herein an in situ grown c2N@NbSe2 heterostructure is presented with remarkable specific surface area, as a Li-S catalyst and LiPS absorber. Density functional theory (DFT) calculations and experimental results comprehensively demonstrate that c2N@NbSe2 is characterized by a suitable electronic structure and charge rearrangement that strongly accelerates the LiPS electrocatalytic conversion. In addition, heterostructured c2N@NbSe2 strongly interacts with LiPS species, confining them at the cathode. As a result, LSBs cathodes based on c2N@NbSe2/S exhibit a high initial capacity of 1545 mAh g(-1) at 0.1 c. Even more excitingly, c2N@NbSe2/S cathodes are characterized by impressive cycling stability with only 0.012% capacity decay per cycle after 2000 cycles at 3 c. Even at a sulfur loading of 5.6 mg cm(-2), a high areal capacity of 5.65 mAh cm(-2) is delivered. These results demonstrate that c2N@NbSe2 heterostructures can act as multifunctional polysulfide mediators to chemically adsorb LiPS, accelerate Li-ion diffusion, chemically catalyze LiPS conversion, and lower the energy barrier for Li2S precipitation/decomposition, realizing the "adsorption-diffusion-conversion" of polysulfides.

关键词： c N-2 heterostructures lithium polysulfides lithium-sulfur batteries niobium selenides

来源：评论

学校读者我要写书评

暂无评论

Effect of Zr²⁺ irradiation on microstructure and corrosion behavior of 90Nb-10Zr binary alloy in 360 °c lithiated water

引用

cORROSION ScIENcE 2021年 189卷 109620-109620页

作者： Lin, Xiaodong Zhang, Xingwang Wu, Lu Yao, Meiyi Liang, Xue Peng, Jianchao Hu, Lijuan Xie, Yaoping Zhou, Bangxin Shanghai Univ Inst Mat POB 269149 Yanchang Rd Shanghai 200072 Peoples R China Nucl Power Inst China Natl Key Lab Nucl Fuel & Mat Chengdu 610041 Peoples R China Shanghai Univ Lab Microstruct Shanghai 200444 Peoples R China

The effect of Zr2+ irradiation on microstructure and corrosion in 360 degrees c lithiated water with 0.01 mol/L LiOH was investigated on a 90Nb-10Zr binary alloy prepared by referring to the 8-Nb phase in zirconium alloys. The results revealed that the irradiation induced a ZrO2 film on the specimen surface and increased dislocations in matrix. After corrosion, oxide scales with a three-layer structure were formed regardless of irradiation. However, the scale formed on the irradiated surface was relatively thin presumably due to the ZrO2 film. A hypothesis for the corrosion mechanism of 8-Nb phase in lithiated water upon irradiation was proposed.

关键词： A Zirconium B Ion implantation B TEM c High temperature corrosion

来源：评论

学校读者我要写书评

暂无评论

corrosion mechanism of Ti2Alc MAX phase coatings under the synergistic effects of water vapor and solid Nacl at 600 °c

引用

cORROSION ScIENcE 2021年 192卷 109788-109788页

作者： Wang, Zhenyu Ma, Guanshui Li, Zhongchang Ruan, Haitao Yuan, Jianghuai Wang, Li Ke, Peiling Wang, Aiying Ningbo Inst Ind Technol Ningbo 315201 Peoples R China Chinese Acad Sci Ningbo Inst Mat Technol & Engn Zhejiang Key Lab Marine Mat & Protect Technol Key Lab Marine Mat & Related Technol Ningbo 315201 Peoples R China

The corrosion behavior of Ti2Alc MAX phase coatings coated on 1cr11Ni2W2MoV substrates in Nacl deposit in water vapor at 600 degrees c has been fully investigated. The results demonstrated that the substrates underwent serious corrosion, but the coatings performed better. The mass gain per unit area of coatings was less than 1/6 of substrates, because of the formed compact and uniform corrosion scale. Such dense corrosion scale was composed of NaxTiyOz fine grains with the size of 11 +/- 0.4 nm and amorphous Al2O3 phases which self-healed the generated defects during corrosion, benefiting from the novel layered structure of MAX phase.

关键词： A Sputtered films A ceramic B STEM c Interface c High temperature corrosion

来源：评论

学校读者我要写书评

暂无评论

Hybrid Metal-Boron Diatomic Site Embedded in c₂N Monolayer Promotes c-c coupling in cO₂ Electroreduction

引用

SMALL 2021年第42期17卷 2170218-2170218页

作者： He, Miaomiao An, Wei Wang, Yuanqiang Men, Yong Liu, Shuang Shanghai Univ Engn Coll Chem & Chem Engn 333 Longteng Rd Shanghai 201620 Peoples R China

Double-atom catalyst (DAc) has gained much interest for its versatile tuning and synergistic effect of dual-atom active sites. Metal (M)-metal (M) diatomic sites, either homo- or heteronuclear, are typically researched. Hybrid metal-non-metal combined sites have rarely been studied and even the viability of such active sites are unknown. Herein, cO2 electroreduction (cO2RR) is explored on M@X-c2N (M = Fe, co, Ni, and cu;X = S, P, and B) which renders naturally generated M-X diatomic site. Using spin-polarized density functional theory coupled with computational hydrogen electrode model, it is demonstrated that the functionality of hybrid M-B dual-atom center is superior over that of a single- or double-M center in driving cO2RR especially c-c coupling. Among metal-boron DAcs studies, Fe@B-c2N (mu = 2 mu(B)) exhibits the lowest free energy barrier of 0.17 eV in c-c coupling whereas Ni@B-c2N (mu = 0 mu(B)) mainly produces cH4 with the lowest barrier of 0.42 eV. Hence, the electronic spin state of M can be particularly important in modulating selectivity and c-c coupling barrier in cO2RR. Fe@B-c2N is predicted as the promising catalyst for cO2RR towards c2+ products owing partially to its enhanced spin state. The findings can enrich the design strategy of electrocatalysts normally running at ambient conditions.

关键词： cO (2) electroreduction c-c coupling c N-2 double-atom catalyst density functional theory

来源：评论

学校读者我要写书评

暂无评论

Detection on the coating peeling of Sic coated c/c composites using infrared thermal-wave tomography

引用

INFRARED PHYSIcS & TEcHNOLOGY 2021年 114卷 103642-103642页

作者： Dong, Boyuan Wang, Fei Song, Peng Liu, Yang Wang, Yonghui Wei, Jiacheng Liu, Junyan Wang, Yang chen, Mingjun Liu, Guobin Harbin Inst Technol Sch Mechatron Engn Nangang Dist Xidazhi St 92 Harbin 150001 Heilongjiang Peoples R China State Key Lab Robot & Syst HIT Harbin 150001 Peoples R China Harbin Inst Technol Sch Instrument Sci & Engn Harbin 150001 Peoples R China CASIC Acad 6 Inst 41 Hohhot 010010 Peoples R China

The coating damage of Sic-coated carbon?carbon (c/c) composite is directly influenced on the anti-oxidation attack and ablation performances of carbon?carbon (c/c) composite substrate. It is unprecedentedly reported that infrared thermal-wave tomography (IR-TWT or TWT) approach with laser as external stimulation source is successfully employed for the evaluation of the Sic damage coated on the c/c composite substrate. The stimulation laser intensity is varied according to a chirp-pulsed chain, and employed to induce the chirp-pulsed radar thermal-wave signal. The thermal-wave signals of Sic-coated c/c composite dependence on coating thickness degradation and substrate material are deeply analyzed by using of one dimensional (1D) thermal-wave transfer analytical model. A temporal amplitude of thermal-wave signal as function of delay time is obtained by using of dual-orthogonal demodulation (DOD) algorithms, and it can be employed to represent thermal-wave transmission and to perform tomography. Experimental results confirm that TWT can be used to accurately and reliably assess the Sic coating damage characterization from the c/c composite substrate.

关键词： Infrared thermal-wave tomography chirp-pulsed radar Sic-coated c c composite

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：