检索结果-南通市图书馆

Hierarchical growth of a novel Mn-Bi coupled BiVO4 arrays for enhanced photoelectrochemical water splitting

在线全文

学校读者我要写书评

暂无评论

Nano Research 2019年第3期12卷 575-580页

作者： Lu Wang jinzhan su Liejin Guo International Research Center for Renewable Energy State Key Laboratory of Multiphase Flow in Power Engineering School cf Energy & Power Engineering Xian Jiaotong University Xian 710049 China

Oxygen evolving catalyst (OEC) is a critical determinant for the efficiency of photoelectrochemical (PEC) water splitting. Here we report an approach to depositing a novel manganese borate (Mn-Bi) OER catalyst on BiVO4 nanocone photoanode by photodeposition in sodium borate buffer solution containing Mn(Ⅱ) ions. Due to the spontaneous photo-electric-field-enhancement effect at the vertically oriented BiVO4 nanocone structure, spherical Mn-Bi nanoparticle was selectively photodeposited at the apex of BiVO4 nanocone. Significant improvement of photocurrent was observed for the obtained hierarchical Mn-Bi/BiVO4 photoanode which could be ascribed to enhanced hole injection efficiency, especially in low bias region. It was observed that the injection efficiency of Mn-Bi/BiVO4 is 98% which gave a photocurrent of 0.94 mA/cm^2 at 1.5 V vs. RHE.

关键词： bismuth vanadate photoelectrochemistry solar water splitting oxygen evolution

Room-temperature photodeposition of conformal transition metal based cocatalysts on BiVO4 for enhanced photoelectrochemical water splitting

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nano Research 2020年第1期13卷 231-237页

作者： Lu Wang Tao Zhang jinzhan su Liejin Guo International Research Center for Renewable Energy State Key Laboratory of Multiphase Flow in Power EngineeringSchool of Energy&Power EngineeringXi’an Jiaotong UniversityXi’an710049China

Photoelectrochemical(PEC)water splitting using semiconductors offers a promising way to convert renewable solar energy to clean hydrogen ***,due to the sluggish reaction kinetics of water oxidation,significant charge recombination occurred at the photoanode/electrolyte interface and cause decrease of its PEC *** reduce the surface recombination,we deposit different transition metal complexes on BiVO4 nanocone arrays by a versatile light driven in-situ two electrode photodeposition approach without applied *** cobalt phosphate“Co-Pi”,nickel borate“Ni-Bi”and manganese phosphate“Mn-Pi”complexes were deposited on BiVO4 nanocone arrays to form core-shell structure photoanode,all of which lead to enhanced photoelectrochemical *** photocurrent of the Co-Pi/BiVO4 photoanode under front-side illumination for 5 min is increased by 4 folds comparing to that of bare BiVO4 photoanode at 0.6 V ***,reaching a hole transfer efficiency as high as 94.5%at 1.23 V *** proposed photodeposition strategy is simple and efficient,and can be extended to deposite cocatalyst on other semiconductors with a valence band edge located at a potential more positive than the oxidation potential of transition metal ion in the cocatalyst.

关键词： bismuth vanadate photoelectrochemcial water splitting conformal photodeposition cocatalyst

Synthesis and application of transition metal phosphides as electrocatalyst for water splitting

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science Bulletin 2017年第9期62卷 633-644页

作者： jinzhan su Jinglan Zhou Lu Wang Cong Liu Yubin Chen International Research Center for Renewable Energy (IRCRE) State Key Laboratory for Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an 710049 China

With continuous research on photocatalytic water splitting, searching for efficient catalyst for hydrogen evolution reaction(HER) becomes popular topic in addition to main catalyst research. Transition metal phosphides are receiving intense attention due to its abundance in the Earth's crust and comparable catalytic properties to noble metals. In this review, the synthesis approaches, HER reaction mechanism,photocatalytic activity, approaches to improve the activity of transition metal phosphides were reviewed and discussed. It was showed that the transition metal phosphides have great potential to reduce the cost of photocatalyst and promising application on water splitting. The stability problem and participation of poisonous reactant and product in its synthesis reaction limit its application and developing in a certain extent, but with the continuous efforts on the development and improvement of the synthesis methods,transition metal phosphides will find wide application in water splitting.

关键词： Transition metal phosphide Electrocatalyst HER Photocatalytic water splitting

Spontaneous photoelectric field-enhancement effect prompts the low cost hierarchical growth of highly ordered heteronanostructures for solar water splitting

在线全文

学校读者我要写书评

暂无评论

Nano Research 2016年第6期9卷 1561-1569页

作者： Yankuan Wei jinzhan su XiaokangWan Liejin Guo Lionel Vayssieres International Research Center for Renewable Energy State Key Laboratory for Multiphase Flow in Power Engineering School of Energy &Power Engineering Xi'an Jiaotong University Xi'an 710049 China

In this study, a potentially universal new strategy is reported for the large-scale, low-cost fabrication of visible-light-active highly ordered heteronanostructures based on the spontaneous photoelectric-field-enhancement effect inherent in pyramidal morphology. The hierarchical vertically oriented arrayed structures comprise an active molecular co-catalyst at the apex of a visible-light-active large band gap semiconductor for low-cost solar water splitting in a neutral aqueous medium without the use of a sacrificial agent.

关键词： bismuth vanadate co-catalysts photocatalysis solar water splitting oxygen evolution

Precise modeling of arc tooth face-gear with transition curve

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Aeronautics 2013年第5期26卷 1346-1351页

作者： Cui Yanmei Fang Zongde su jinzhan Feng Xianzhang Peng Xianlong School of Mechanical Engineering Northwestern Polytechnical University School of Construction Machinery Chang’an University School of Mechatronics Engineering Zhengzhou Institute of Aeronautical Industry Management

A fabrication method is adopted for which an imaginary gear simultaneously realizes conjugated meshing with an arc tooth cylindrical gear and an arc tooth face-gear. The cutter fillet and tooth crest edge form the tooth root fillet of the gear, and the linear tooth surface equation of the imaginary gear and the position vector of the curvature center of the cutter fillet arc constructed with certain cutter inclination to deduce a working arc tooth surface equation. The tooth root fillet equation of the arc tooth face-gear is derived from the meshing geometry and kinematics. A numer- ically controlled machining model of the arc tooth face-gear is established through the transforma- tion of adjustment parameters from the cutter-tilt milling machine to a common multi-axis NC machine. Motion parameters of each movement axis of the NC machine are acquired. A processing example is presented to verify the precision of the fabrication method in processing the arc tooth face-gear. The method provides a theoretical and tentative basis for the analysis of tooth surface contact stress, tooth root bending stress and dynamics. A hobbing test is conducted to demonstrate the good meshing condition of the arc tooth face-gear pair.

关键词： Face-gear Geometry Kinematics Mechanical drive NC machine Transmissions

Modulating redox transition kinetics by anion regulation in Ni-Fe-X(X=O,S,Se,N,and P)electrocatalyst for efficient water oxidation

在线全文

学校读者我要写书评

暂无评论

Nano Research 2024年第6期17卷 4720-4728页

作者： Liting Wei Kaini Zhang Rui Zhao Lei Zhang Yan Zhang suyi Yang jinzhan su International Research Center for Renewable Energy&State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong UniversityXi’an 710049China Department of Applied Chemistry Yuncheng UniversityYuncheng 044000China

NiFe-based electrocatalysts will experience dynamical surface reconstruction during oxygen evolution reaction(OER)process,and the derived metal(oxy)hydroxide hybrids on the surface have been considered as the actual active species for *** efforts have been dedicated to understanding the surface reconstruction,but there is rare research on recognizing the origin of improved performance derived from anion species of ***,the OER electrocatalytic characteristics were tuned with different anions in NiFe-based catalyst,using NiFe-based oxides/nitride/sulfide/selenides/phosphides(NiFeX,X=O,N,S,Se,and P)as the model *** combination of X-ray photoelectronic spectroscopy,electrochemical tests,operando spectroscopic characterizations,and density functional theory(DFT)calculations,reveals that anion with lower electronegativity in NiFe-based catalyst leads to higher conductivity and delayed valence transition of Ni sites,as well as optimized adsorption behavior towards oxygen intermediates,contributing to enhanced OER ***,NiFeP electrocatalyst demonstrates an ultralow overpotential of 265 mV at 20 mA·cm−2 for OER,as well as long-term *** work not only offers further insights into the effect of anionic electronegativity on the intrinsic OER electrocatalytic properties of NiFe-based electrocatalyst but also provides guide to design efficient non-noble metal-based electrocatalysts for water oxidation.

关键词： oxygen evolution reaction(OER) anion species electronegativity valence transition

Recent advances in all-in-one flexible supercapacitors

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China Materials 2021年第1期64卷 27-45页

作者： Tiezhu Guo Di Zhou Wenfeng Liu jinzhan su Electronic Materials Research Laboratory Key Laboratory of the Ministry of Education&International Center for Dielectric ResearchSchool of Electronic Science and EngineeringXi’an Jiaotong UniversityXi’an710049China State Key Laboratory of Electrical Insulation and Power Equipment Xi’an Jiaotong UniversityXi’an710049China International Research Centre for Renewable Energy State Key Laboratory of Multiphase Flow in Power EngineeringXi’an Jiaotong UniversityXi’an710049China

The rise of personalized flexible electronics has promoted the rapid development of flexible supercapacitors due to their long service life,fast charging-discharging rates and safe *** from the traditional flexible supercapacitors,the all-in-one integrated flexible supercapacitors are more resistant to deformation and lower interface resistance,which have a broader application prospect in the field of flexible *** review briefly summarizes the preparation methods and electrochemical properties of some typical all-in-one supercapacitors,represented by planar and fibrous structures in recent ***,the basic understanding of traditional flexible supercapacitors and all-in-one integrated flexible supercapacitors,and the key parameters of the performance of flexible supercapacitors are ***,the hydrogel matrix all-in-one supercapacitors with different functional characteristics(stretchable,self-healing and compressible)and the nonhydrogel matrix(separator,flexible membrane)all-in-one supercapacitors are ***,the challenges and future development of flexible supercapacitors are considered.

关键词： flexible supercapacitors all-in-one hydrogel

磷酸钴修饰Cu_(3)V_(2)O_(8)/ZnO光阳极的动力学特性及光电化学水分解研究

在线全文

学校读者我要写书评

暂无评论

化学学报 2024年第1期82卷 26-35页

作者：王志强苏进展西安交通大学动力工程多相流国家重点实验室陕西西安710049

钒酸铜是一种新兴的应用前景广阔的光阳极材料.本工作首先制备了不同厚度的Cu_(3)V_(2)O_(8)光电极,通过强度调制光电流谱、电化学阻抗谱等手段深入探究了影响Cu_(3)V_(2)O_(8)光电性能的关键因素在于光生载流子扩散距离短造成的载流子... 详细信息

钒酸铜是一种新兴的应用前景广阔的光阳极材料.本工作首先制备了不同厚度的Cu_(3)V_(2)O_(8)光电极,通过强度调制光电流谱、电化学阻抗谱等手段深入探究了影响Cu_(3)V_(2)O_(8)光电性能的关键因素在于光生载流子扩散距离短造成的载流子体相复合严重以及缓慢的氧化动力学造成的表面复合严重.为解决该问题,本工作提出了将一维ZnO纳米棒阵列作为支撑骨架以及负载CoPi助催化剂的策略.一维ZnO纳米棒阵列可作为电子快速传输通道促进光生载流子的体相分离,CoPi助催化剂可提高光生载流子表面分离效率提升氧化动力学.

关键词：钒酸铜氧化锌光电化学动力学强度调制光电流谱

在线全文

学校读者我要写书评

暂无评论

弧齿锥齿轮小轮粗切优化及验证

中南大学学报（自然科学版） 2017年第3期48卷 644-649页

作者：苏进展方宗德长安大学道路施工技术与装备教育部重点实验室陕西西安710064 西北工业大学机电学院陕西西安710072

为了获得较为均匀的小轮精切余量,提出弧齿锥齿轮小轮粗切参数优化的方法。根据轮坯的中点检查尺寸对小轮两侧精切齿面进行定位;预置精切余量并沿法向方向叠加,得到小轮粗切的目标齿面;建立小轮精切余量的最小二乘法优化模型,采用基于... 详细信息

为了获得较为均匀的小轮精切余量,提出弧齿锥齿轮小轮粗切参数优化的方法。根据轮坯的中点检查尺寸对小轮两侧精切齿面进行定位;预置精切余量并沿法向方向叠加,得到小轮粗切的目标齿面;建立小轮精切余量的最小二乘法优化模型,采用基于置信域策略的列文伯格-马夸尔特法迭代算法,反求出小轮粗切参数,并对方案进行切齿验证。研究结果表明:将垂直轮位、轴向轮位、床位和刀顶距作为粗切参数,能够获得比格里森粗切更加均匀的精切余量;采用大轮粗切刀盘对小轮进行粗切,则存在明显的齿形角误差。

关键词：弧齿锥齿轮精切余量粗切优化