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Boosting electrocatalytic hydrazine oxidation at single-crystalline ni nanosheets with embedded niZn

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Progress in natural Science:Materials International 2023年第5期33卷 710-717页

作者： xia Wei Hongbin Dai Chuangwei Liu Song Li School of Material Science and Engineering northeastern University

Hydrazine oxidation reaction(Hz OR) plays a crucial role in direct hydrazine fuel cells and holds promise for replacing the kinetics-sluggish oxygen evolution reaction in splitting water. While ni–Zn alloys exhibit exceptional activity for Hz OR, their synthesis under mild conditions remains a challenge. Herein, a ni–Zn nanosheet catalyst with ni Zn inclusion was prepared on ni foam by controllable chemical etching together with ethylene glycol reduction. X-ray diffraction and transmission electron microscopy confirmed the single-crystalline nature and the presence of intermetallic ni Zn. The strong interaction between ni and Zn O, along with defects, facilitated the formation of this intermetallic compound. The ni–Zn/ni foam exhibits remarkable catalytic activity(214.3m A cm-2at 0.1 V) and durability(87.8 % retention after 24 h) towards hydrazine electrooxidation, thanks to the combined benefits of intermetallic ni Zn, mesoporous nanosheets, microscopic defects, single-crystalline characteristics, and a coherent ni–ni Zn interface. This study provides a new method for designing highly active ni–Zn electrocatalysts for Hz OR.

关键词： Hydrazine electrooxidation Intermetallic niZn Single-crystalline Coherent interface Microscopic defects

Water in the upper mantle and deep crust of eastern China: concentration, distribution and implications

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national Science Review 2019年第1期6卷 125-144页

作者： Qun-Ke xia Jia Liu István Kovács Yan-Tao Hao Pei Li xiao-Zhi Yang Huan Chen Ying-Ming Sheng School of Earth Sciences Zhejiang University CAS Key Laboratory of Crust-Mantle Materials and Environments University of Science and Technology of China Hungarian Geological and Geophysical Institute 4. School of Earth Sciences and Engineering Nanjing University

Understanding the concentration and distribution of water in the Earth’s mantle plays a substantial role in studying its chemical, physical and dynamic processes. After a decade of research, a comprehensive dataset of water content in upper-mantle samples has been built for eastern China, which is now the only place with water-content data from such diverse types of natural samples, and provides an integrated picture of the water content and its distribution in the upper mantle at a continental scale. The main findings include the following:(i) the temporal heterogeneity of the water content in the lithospheric mantle from early Cretaceous(～120 Ma) to Cenozoic(nnected with the stability of the north China Craton(from its destruction to its consolidation);(ii) the heterogeneous water content in the Cenozoic lithospheric mantle beneath different blocks of eastern China was not only inherited from tectonic settings from which they came, but was also affected later by geological processes they experienced;(iii) the distinct water content between the lowermost crust and lithospheric mantle of eastern China and its induced rheological contrast at the base of the crust indicate that the continental crust–mantle boundary could behave either in a coupled or decoupled manner beneath different areas and/or at different stages;(iv) the alkali basalts of eastern China demonstrate a heterogeneous distribution of water content in the mantle;local and regional comparisons of the water content between the lithospheric mantle and basalts’ source indicate that the Cenozoic alkali basalts in eastern China were not sourced from the lithospheric ***, the inferred high water contents in the mantle sources suggest that the Cenozoic eastern China basalts were likely sourced from the mantle transition zone(MTZ); and(v) both oceanic and continental crusts may carry a certain amount of water back into the deep mantle of eastern China by plate *** re

关键词： water upper mantle and deep crust continental stability basalt genesis eastern China

Oxidization of fluid-like Li metal with inherent LieLi_(2)O interface from simulation insights

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Journal of Materiomics 2020年第4期6卷 692-701页

作者： xia Lu Xingqun Liao School of Materials Sun Yat-sen UniversityGuangzhou510275China Huizhou Highpower Technology Co.Ltd. Huizhou516000China

The oxidization of pure Li is rarely discussed,but substantially important in the design and optimization,especially the failure mechanism of Li metal anode for rechargeable *** this context,the Li metal and inherent LieLi_(2)O interface after oxidization are examined using first principles *** results demonstrated that in Li itself,the Li ion exhibits a fluid-like transport feature,especially in the vacancy-assisted *** fresh Li surface can be oxidized quickly in air with a thick cover(mainly Li oxides),and an inherent LieLi_(2)O interface is,therefore,*** the lowest surface energy,the Li(111)plane is revealed with a strong capability of adsorbing O and n atoms to form the distorted XLi6(X=O,n,etc.)octahedra in the outmost surface *** the Li ion migrates fast in Li itself,the LieLi_(2)O interface shows a sluggish Li diffusion kinetic in Li_(2)O *** ultimately leads to the Li diffusion prefers to go along the interface boundary in Li side,which loosens the LieLi2O interface structure to result in the exfoliation of surface metastable Li_(2)O spontaneously during electrochemical cycles in Limetal batteries.

关键词： Li metal Li-Li_(2)O interface Stability Kinetics Li-metal batteries

High-energy-density pentazolate salts:Can_(10)and Ban_(10)

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Science China(Physics,Mechanics & Astronomy) 2021年第1期64卷 102-107页

作者： Jianan Yuan Kang xia JueFei Wu Jian Sun national Laboratory of Solid State Microstructures School of Physics and Collaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing210093China

The search for high energy density materials(HEDMs)in polymeric nitrogen compounds has gained considerable *** theoretical predictions and experiments have revealed that metal ions can be used to stabilize the pentazolate(n-5)*** this work,by employing a machine learning-accelerated crystal structure searching method and first-principles calculations,we found that the new pentazolate salts,Can(10)and Ban(10),are energetically favorable at high *** dispersion calculations reveal that they are quenchable at ambient *** initio molecular dynamics simulations verify their dynamic stability at finite *** charge and electron localization function illustrates that alkaline earth atoms serve as electron donors,contributing to the stability of n5 *** calculations reveal covalent bonds between nitrogen atoms and weak interactions between n5 *** to other pentazolate salts,these polymeric nitrides have high energy densities of approximately 2.35 kJ/g for Can(10)and 1.32 kJ/g for Ban(10).The predictions of Can(10)and Ban(10)structures indicate that these salts are potential candidates for green nitrogen-rich HEDMs.

关键词： high energy density material polymeric nitrogen pentazolate salts

Bioprinting and in vitro characterization of alginate dialdehyde-gelatin hydrogel bio‑ink

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Bio-Design and Manufacturing 2020年第1期3卷 48-59页

作者： Fu You xia Wu Michael Kelly Xiongbiao Chen Division of Biomedical Engineering College of EngineeringUniversity of SaskatchewanSaskatoonSK S7N 5A9Canada Department of neurosurgery College of MedicineUniversity of SaskatchewanSaskatoonSK S7N 5A9Canada Department of Mechanical Engineering College of EngineeringUniversity of SaskatchewanSaskatoonSK S7N 5A9Canada

Cell-laden cardiac patches have recently been emerging to renew cellular sources for myocardial infarction(MI,commonly know as a heart attack)***,the fabrication of cell-laden patches with porous structure remains challenging due to the limitations of currently available hydrogels and existing processing *** present study utilized a bioprinting technique to fabricate hydrogel patches and characterize them in terms of printability,mechanical and biological ***-laden hydrogel(or bio-ink)was formulated from alginate dialdehyde(ADA)and gelatin(GEL)to improve the printability,degradability as well as *** groups of hydrogel compositions were designed to investigate the influence of the oxidation degree of ADA and hydrogels concentration on the properties of printed ***-GEL hydrogels have generally shown favorable for living cells(***926 cells and hybrid human umbilical vein endothelial cell line).The hydrogel with an oxidation degree of 10%and a concentration ratio of 70/30(or 10%ADA70-GEL30)demonstrated the best printability among the groups *** hydrogels were also bioprinted with the living cells(***926),and the scaffolds printed were then subject to the cell culture for 7 *** results illustrate that the scaffolds bioprinted from 10%ADA70–GEL30 hydrogels had the best homogenous cell distribution and also the highest cell *** together,in the present study we synthesized a newly formulated bio-ink from ADA and GEL and for the fist time,used them to bioprint cardiac patches,which have the potential to be used in MI repair.

关键词： Bioprinting Alginate dialdehyde Gelatin Bio-ink

Template-assisted formation of atomically dispersed iron anchoring on nitrogen-doped porous carbon matrix for efficient oxygen reduction

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nano Research 2023年第4期16卷 4671-4677页

作者： Ruoyu Pang Hongyin xia Jing Li Erkang Wang State Key Laboratory of Electroanalytical Chemistry Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022China School of Applied Chemistry and Engineering University of Science and Technology of ChinaHefei 230026China

Isolated active metal atoms anchored on nitrogen-doped carbon matrix have been developed as the efficient catalyst for accelerating sluggish reaction kinetics of oxygen reduction reaction(ORR).The facile rational structure engineering with abundant isolated active metal atoms is highly desirable but ***,we demonstrate that atomically dispersed Fe sites(Fe-n4 moieties)on the hierarchical porous nitrogen-doped carbon matrix(Fe-SA-PnC)for high ORR activity can be achieved by a dual-template assisted *** thermal decomposition of nH_(4)Cl template,the nitrogen-doped carbon matrix is generated based on the interaction with carbon precursor of citric ***,the introduction of naCl template facilitates the formation of hierarchical porous structures,which enable more active sites exposed and improve the mass ***,the dual-template strategy can inhibit the formation of iron carbide nanoparticles(nPs)by generating porous structures and avoiding of the rapid loss of nitrogen during *** as-made Fe-SA-PnC catalysts with well-defined Fe-n_(4)active sites exhibit highly efficient ORR activity with a half-wave potential of 0.838 V versus the reversible hydrogen electrode,as well as good stability and methanol tolerance,outperforming the commercial Pt/*** zinc-air battery(ZAB)constructed by Fe-SA-PnC also shows a higher peak power density and specific discharging capacity than that of Pt-based *** present work provides the facile strategy for tailoring nitrogen doping and porous structures simultaneously to prevent the formation nPs for achieving the well-dispersed and accessible single-atom active sites,paving a new way to design efficient electrocatalysts for ORR in fuel cells.

关键词： template-assistance strategy nitrogen-doped porous carbon matrix single-atom Fe catalyst oxygen reduction reaction zinc-air battery

A Method of Determining Selectivity Coefficients Based on the Practical Slope of Ion Selective Electrodes

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Chinese Chemical Letters 2002年第4期13卷 355-358页

作者： Hai xia WAnG Min PU School of Science Xi’an Jiaotong UniversityXi’an 710049

It is a problem to be solved that the experimental selectivity coefficients of ion selective electrodes (ISEs) depend on the activity. This paper studied the new method of determining selectivity coefficients. A mixed ion response equation, which was similar to nicolsky-Eisenman (n-E) equation recommended by IUPAC, was proposed. The equation includes the practical response slope of ISEs to the primary ion and the interfering ion. The selectivity coefficient was defined by the equation instead of the n-E equation. The experimental part of the method is similar to that based on the n-E equation. The values of selectivity coefficients obtained with this method do not depend on the activity whether the electrodes exhibit the nernst response or non-nernst response. The feasibility of the new method is illustrated experimentally.

关键词： Ion selective electrodes potentiometric selectivity coefficients nicolsky-Eisenman equation.

The rheological and tribological properties of calcium sulfonate complex greases

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Friction 2015年第1期3卷 28-35页

作者： Zeyun WAnG Yanqiu xia Zhilu LIU School of Chemistry and Chemical Engineering Ningxia UniversityYinchuan750021China State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou730000China School of Energy Power and Mechanical Engineering North China Electric Power UniversityBeijing210094China

In this study,we synthesized two types of calcium sulfonate complex greases(barium soap and calcium soap)and investigated their physical,rheological,and tribological properties in *** test results showed that the evolution of their linear viscoelasticity functions with frequency were quite similar to those of traditional lubricating ***,these two calcium sulfonate complex greases had good friction-reducing and antiwear properties at room temperature and at 150°*** addition,by adding an organic molybdenum compound(MoDTC)to the base greases,we obtained a very low friction coefficient(0.065)for one of the greases(calcium soap)at 400 n and 500 n(maximum Hertzian pressures of 3.47 GPa and 3.74 GPa,respectively)at 150°C.X-ray photoelectron spectroscopy(XPS)analysis showed that the tribofilm was composed of some complex oxide species and CaCO3 that had formed on the worn surface.

关键词： calcium sulfonate complex greases tribological properties rheology viscoelasticity

Geochemistry,Geochronology,Sr-nd Isotopic Compositions of Jiang Tso Ophiolite in the Middle Segment of the Bangong- nujiang Suture Zone and Their Geological Significance

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Acta Geologica Sinica(English Edition) 2015年第2期89卷 389-401页

作者： HUAnG Qiangtai LI Jianfeng CAI Zhourong xia Lianze YUAn Yajuan LIU Huichuan xia Bin School of Marine sciences Sun Yat-Sen University Key Laboratory of Offshore Oil Exploration and Development Guangdong University Guangdong Provincial Key Laboratory of Marine Resources and Coastal Engineering Guangzhou Institute of Geochemistry Chinese Academy of Sciences School of Earth Science and Geological Engineering Sun Yat-sen University

The Jiang Tso ophiolite, situated in the middle segment of the Bangong- nujiang Suture Zone, is a part of the easternmost Qieli Lake ophiolite subzone and is close to the south of Pung Lake ophiolite. The rock association of Jiang Tso ophiolite is relatively complete and is mainly composed of metamorphic peridotite, gabbro and diabase. Comparing with n-MORB, the ophiolite is high in Mg and low in Ti, K, na, P, and is depleted in nb, Ta, Hf, Th and enriched in Rb, Sr and Ba. Geochemical characteristics of the Jiang Tso ophiolite indicate it is of a supra-subduction zone type formed in the spreading ridge of back arc basin. The SHRIMP U-Pb dating of zircons from the gabbro yielded a weighted average age of 188.1±4.1 Ma （MSWD=1.4）, indicating the Jiang Tso ophiolite was formed in the late stage of early Jurassic. The Sr, nd isotopic compositions show that the Tethyan mantle domain is the depleted mantle （DM）, with enriched mantle domain II （EMII）. They have the same Sr, nd isotopic composition with the India Ocean MORB type.

关键词： geochemistry SHRIMP U-Pb dating Sr-nd isotopes tectonic environment Tibet