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One-dimensional iridium-based nanowires for efficient water electrooxidation and beyond

Nano Research 2022年第2期15卷 1087-1093页

作者： Leigang Li Pengtang Wang Zifang Cheng qi shao Xiaoqing Huang State Key Laboratory of Physical Chemistry of Solid Surfaces College of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005China College of Chemistry Chemical Engineering and Materials ScienceSoochow UniversitySuzhou 215123China

The sluggish reaction kinetics of oxygen evolution reaction(OER)has largely lowered the efficiency of electrochemical water *** represents one of the state-of-the-art electrocatalysts for promoting OER especially in acidic ***,it remains a formidable challenge to synthesize high-quality one-dimensional(1D)Ir-based nanostructures for improved electrocatalytic ***,a template-assisted synthesis method is reported wherein 1D porous Ir-Te nanowires(Ir-Te NWs)are synthesized with Te NWs serving as the *** Ir-Te NWs exhibit highly enhanced OER performance compared to commercial IrO_(2) and Ir/*** detail,the overpotentials to reach 10 mA cm^(-2) are 248 and 284 mV in 1 M KOH and 0.5 M H2S04,respectively,much lower than those of commercial *** Ir-Te NWs also show smaller Tafel slopes than commercial IrO_(2) and Ir/C,signifying faster reaction ***,much more durable OER activity can be maintained for Ir-Te NWs with negligible decay during 25 and 20 h stability tests in 1 M KOH and 0.5 M H_(2)SO_(4),*** analysis indicates that the significantly improved OER performance of Ir-Te NWs could be ascribed to the larger electrochemical surface area and smaller electrical *** significantly,the templated synthesis of Ir-Te NWs can be facilely extended to the fabrication of other metal-Te NWs including Ru-Te,Rh-Te and Pt-Te *** design and synthesis of 1D metal-based NWs in this work provide important inspiration for the synthesis of diversified 1D metallic nanostructures with distinctly enhanced catalytic performance and beyond.

关键词： Ir template nanowire water splitting oxygen evolution reaction

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Phase and structure modulating of bimetallic Cu/In nanoparticles realizes efficient electrosynthesis of syngas with wide CO/H_(2) ratios

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Nano Research 2022年第1期15卷 528-534页

作者： Chenqi Shen Pengtang Wang Leigang Li Xiaoqing Huang qi shao College of Chemistry Chemical Engineering and Materials ScienceSoochow UniversitySuzhou 215123China State Key Laboratory of Physical Chemistry of Solid Surfaces College of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005China

Syngas(CO+H_(2))is the incredibly important feedstock for producing synthetic fuels and various value-added ***_(2) electrochemical reduction to syngas is an environmental-friendly and sustainable approach,but still challenging to produce tunable syngas with a wide ratio of CO+H_(2).Herein,by modulating the structure and phase,we have successfully obtained a series of copper-indium(Cu-ln)catalysts,which are efficient for producing syngas with tunable CO+H_(2) ratios.A series of Culn bimetallic catalysts with different structures from hollow sphere to two-layer hollow sphere and different phases from CuO to CU_(2)O are *** find that the CO and H2 are the only gaseous products,in which the CCD/H_(2) ratios can be readily tuned from 1.2±0.1 to 9.0±1.5 by simply controlling the thermal annealing *** also exhibits high durability during a 10-h *** unique performance is attributed to the modulated In enrichment on the Cu surfaces during the CO_(2) reduction reaction,which causes the differences in binding energies for key reaction intermediates,thus resulting in the tunable composition of *** present work emphasizes a simple yet efficient phase and structure modulating strategy for designing potential electrocatalysts for producing syngas with widely tunable CO+H_(2) ratios.

关键词： copper indium phase-engineering CO_(2)reduction syngas

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Novel medium entropy perovskite oxide Sr(FeCoNiMo)_(1/4)O_(3−δ)for zinc-air battery cathode

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Journal of Energy Chemistry 2024年第9期96卷 669-678页

作者： Kaixin Li Juntao Gao Xu Han qi shao Zhe Lü School of Physics Harbin Institute of TechnologyHarbin 150001HeilongjiangChina Heilongjiang Provincial Key Laboratory of Advanced Quantum Functional Materials and Sensor Components Harbin 150001HeilongjiangChina

It is widely recognized that the development of ZABs is impeded by the kinetic bottleneck of oxygen evolution reaction(OER)and oxygen reduction reaction(ORR).The application of conformational entropy strategy to oxides often involves introducing multiple elements with different properties,thereby providing outstanding bifunctional catalytic activity for OER/***,the possible underlying catalytic pathways and potential interactions between various components are still poorly *** paper presents an excellent medium-entropy perovskite oxide,Sr(FeCoNiMo)_(1/4)O_(3−δ)(lower overpotential of 301 mV at 10 mA cm^(−2)).Zinc-air batteries employing it as a cathode catalyst demonstrate excellent round-trip efficiency(62%).By combining theoretical calculation with experiments,we aim to establish the link between the electronic structure of perovskite oxides with different elemental compositions and their OER *** reveals that the conformational entropy strategy can simultaneously shift the O 2p-band center and metal d-band center of perovskite oxide towards the vicinity of the Fermi energy level,thereby triggering a more favorable lattice oxygen-participated mechanism(LOM)during the OER *** outcomes of this work provide crucial insights into the role of conformational entropy strategies in oxygen catalysis and offer potential avenues for constructing efficient and stable electrocatalysts.

关键词： Sr(FeCoNiMo)_(1/4)O_(3−δ) Bifunctional catalyst Medium entropy LOM Rechargeable zinc-air batteries

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Circuit model based design and analysis for a four-structure-switchable wireless power transfer system

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Science China(Technological Sciences) 2015年第3期58卷 534-544页

作者： FANG XueLin LIU Hao LI GuiYang shao qi LI HongYi State Key Laboratory of Robotics Shenyang Institute of Automation Chinese Academy of Sciences University of Chinese Academy of Sciences

The four-coil wireless power transfer(WPT)technology can effectively improve the transfer *** high efficiency,however,cannot be obtained along the whole transfer distance due to the phenomenon of frequency splitting in the over coupled *** at this limitation,this paper presents a switchable WPT system to improve the overall efficiency by changing the number of working *** switching conditions for the designed system are determined based on the analysis of the transfer efficiencies of four structures,which is deduced through modeling the equivalent *** simulation results well comply with the experimental results and both of them indicate that the switchable system can greatly improve the overall transfer efficiency along the whole transfer *** overall efficiency of the experimental system can reach above 70%at9.97 MHz without additional complexity,which is higher than any single structure system.

关键词： magnetic resonance coupling efficiency analysis structures switched wireless power transfer

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Efficient catalytic hydrogen generation by intermetallic platinum-lead nanostructures with highly tunable porous feature

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Science Bulletin 2019年第1期64卷 36-43页

作者： Bin E Lingzheng Bu qi shao Yujing Li Xiaoqing Huang College of Chemistry Chemical Engineering and Materials Science Soochow University Department of Materials Science and Engineering China University of Petroleum College of Materials Beijing Institute of Technology

The water-gas shift(WGS) reaction is an essential industrial reaction for upgrading hydrogen(H2) by removing carbon monoxide(CO), while highly efficient platinum(Pt)-based catalysts for WGS with simultaneously high activity and stability are still yet to be developed due to the poisoning issue during the reaction. Herein, we report on the porous PtPb peanut nanocrystals(porous PtPb PNCs) and porous PtPb octahedron nanocrystals(porous PtPb ONCs) with controllable ratios of Pt/Pb as extremely active and stable catalysts towards WGS reaction. It exhibits the composition-dependent activity with porous PtPb PNCs-40/ZnO being the most active for WGS to H_2, 16.9 times higher than that of the commercial Pt/C. The porous PtPb PNCs-40/ZnO also display outstanding durability with barely activity decay and negligible structure and composition changes after ten successive reaction cycles. X-ray photoelectron spectroscopy(XPS) results reveal that the suitable binding energy of Pt 4f_(7/2) and the high ratio of Pt(0)to Pt(II) in porous PtPb PNCs/ZnO and porous PtPb ONCs/ZnO are crucial for the enhanced WGS *** CO stripping results indicate the optimized CO adsorption strength on the Pt surface ensure the excellent WGS activity and the outstanding durability. The present work demonstrates an important advance in tuning the porous metal nanomaterials as highly efficient and durable catalysts for catalysis,energy conversion and beyond.

关键词： Porous Selective etching Hydrogen Pt-Pb Water-gas shift

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Surface engineering at the interface of core/shell nanoparticles promotes hydrogen peroxide generation

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National Science Review 2018年第6期5卷 895-906页

作者： Yonggang Feng qi shao Bolong Huang Junbo Zhang Xiaoqing Huang College of Chemistry Chemical Engineering and Materials Science Soochow University Department of Applied Biology and Chemical Technology Hong Kong Polytechnic University

Hydrogen peroxide(HO), an environmentally friendly oxidant, has already been widely used in many chemical synthesis and industrials as an alternative to replace traditional oxidants including chlorinated oxidizers and strong acids. However, the conventional synthesis method confronts intense energy cost,tedious separation procedures and high cost, which is not competitive with traditional oxidants. Although direct HOsynthesis from Hand Ois a green and atomically economic reaction, satisfactory activity and desirable selectivity still remain formidable challenges. Herein, for the first time, a class of Pd@NiO-x nanoparticles(NPs)(x = 1, 2, 3 and 4) with a unique core@shell interface structure has been created to achieve high activity, selectivity and stability for the direct HOsynthesis. A precise thermal annealing on Pd@Ni-x NPs revealed that the resulting Pd@Ni O-x NPs exhibited the volcano-like activity toward direct HOsynthesis as a function of annealing temperature and time. By tuning the composition of Pd@Ni O-x NPs and the reaction condition, the efficiency of HO-2 synthesis could be well optimized with 5 wt%Pd@NiO-3/TiOexhibiting the highest productivity(89 mol/(kgh)) and selectivity(91%) to HOas well as excellent stability, making it one of the best catalysts for direct HOsynthesis reported to date.

关键词： hydrogen peroxide direct synthesis Core@shell structure palladium nickel oxide

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Feedback regulation between phosphatidylinositol-3,4,5-trisphosphate dependent Rac exchange factor 1 and transforming growth factor β1 and prognostic value in gastric cancer

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World Journal of Gastroenterology 2020年第1期26卷 21-34页

作者： qi shao Zhi-Ming Chen Department of Chemotherapy/Radiotherapy Affiliated Hospital of Nantong University

BACKGROUND Phosphatidylinositol-3,4,5-trisphosphate dependent Rac exchange factor 1(PREX1)was reported to be overexpressed in some cancers and involved in cancer development,but its expression and significance in gastric cancer remain *** To evaluate the expression of PREX1 in gastric cancer and its significance in the development of gastric cancer,especially to evaluate the potential mechanism of PREX1 in gastric *** Bioinformatic analysis was performed in order to examine the expression of PREX1 in gastric *** relationship between the survival rate of gastric cancer patients and PREX1 expression was assessed by Kaplan Meier *** Gene Set Enrichment Analysis and the correlation between PREX1 and transforming growth factor(TGF)β1 pathway-related mediators were evaluated by cBioPortal for Cancer *** blotting and reverse transcriptase polymerase chain reaction assay were used to test the role of TGFβ1 on the expression of *** blotting and dual-luciferase reporter system was used to evaluate the effect of PREX1 on the activation of TGFβ1 *** healing and Transwell assay were used to assess the effect of PREX1 on the metastasis activity of gastric cancer *** PREX1 was overexpressed in the gastric tumors,and the expression levels were positively associated with the development of gastric ***,the high expression of PREX1 revealed poor prognosis,especially for those advanced and specific intestinal gastric cancer ***1 was closely involved in the positive regulation of cell adhesion and positively correlated with TGFβ1-related ***,TGFβ1 could induce the expression of PREX1 at both the protein and mRNA ***,PREX1 could activate the TGFβ1 *** induced PREX1 could increase the migration and invasion activity of gastric cancer *** PREX1 is overexpressed in gastric cancer,and the high level of PREX1 predicts poor ***1 is closely assoc

关键词： Phosphatidylinositol-3,4,5-trisphosphate dependent Rac exchange factor 1 Gastric cancer High expression Poor prognosis Metastasis Transforming growth factorβ1 pathway

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BLOW-UP ESTIMATES FOR A NON-NEWTONIAN FILTRATION SYSTEM

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Applied Mathematics and Mechanics(English Edition) 2001年第3期22卷 332-339页

作者： YANG Zuo-dong(杨作东) LU qi-shao(陆启韶) College of Science Beijing University of Aeronautics and AstronauticsBeijing 100083 P R China College of Science Beijing University of Aeronautics and AstronauticsBeijing 100083 P R China

The prior estimate and decay property of positive solutions are derived for a system of quasi- linear elliptic differential equations first. Hence, the result of non-existence for differential equation system of radially nonincreasing positive solutions is implied. By using this nonexistence result, blowup estimates for a class quasi-linear reaction-diffusion systems ( non-Newtonian filtration systems) are established, which extends the result of semi-linear reaction diffusion( Fujita type) systems.

关键词： blow-up blow-up rates quasi-linear equation system

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Partially hydroxylated ultrathin iridium nanosheets as efficient electrocatalysts for water splitting

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National Science Review 2020年第8期7卷 1340-1348页

作者： Zifang Cheng Bolong Huang Yecan Pi Leigang Li qi shao Xiaoqing Huang College of Chemistry Chemical Engineering and Materials Science Soochow University Department of Applied Biology and Chemical Technology Hong Kong Polytechnic University

Ultrathin two-dimensional（2D） materials have attracted considerable attention for their unique physicochemical properties and promising applications; however, preparation of freestanding ultrathin 2D noble metal remains a significant challenge. Here, for the first time, we report use of a wet-chemical method to synthesize partially hydroxylated ultrathin Ir nanosheets（Ir-NSs） of only five to six atomic layers’ thickness. Detailed analysis indicates that the growth confinement effect of carbon monoxide and the partially hydroxylated surface play a critical role in formation of the ultrathin structure. The ultrathin Ir-NSs exhibit excellent performance for both the hydrogen evolution reaction and oxygen evolution reaction in a wide p H range, outperforming the state-of-the-art Pt/C and IrO;, respectively. Density-functional theory calculations reveal that the partial hydroxylation not only enhances the surface electron transfer between Ir-sites and intermediate O-species, but also guarantees efficient initial activation of bond cleavage of H-O-H for first-step H;O splitting. This, ultimately, breaks through barriers to full water splitting, with efficient electron transfer essentially maintained.

关键词： iridium nanosheet 2D material hydroxylation overall water splitting

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A Criterion for Stability of Synchronization and Application to Coupled Chua's Systems

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Communications in Theoretical Physics 2009年第3期51卷 475-478页

作者： WANG Hai-Xia LU qi-shao WANG qing-Yun School of Science Nanjing University of Science and Technology Nanjing 210094 China School of Science Beihang University Beijing 100191 China School of Statistics and Mathematics Inner Mongolia College Huhhot 010051 China

We investigate synchronization in an array network of nearest-neighbor coupled chaotic oscillators. By using of the Lyapunov stability theory and matrix theory, a criterion for stability of complete synchronization is deduced. Meanwhile, an estimate of the critical coupling strength is obtained to ensure achieving chaos synchronization. As an example application, a model of coupled Chua＇s circuits with linearly bidirectional coupling is studied to verify the validity of the criterion.

关键词： synchronization Lyapunov function approach Lipschitz condition

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