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Porous Si-doped flower-like BiOCl with hydrophobic interfaces for efficient CO2-to-formate conversion

SEPARATION AND PURIFICATION technology 2025年 362卷

作者： Zhang, Chao Jiang, Lulu Zhang, Delu Wang, Haipeng Ming, Shujun Gao, Yongsheng Lv, Zhiguo Sun, Fujin Qingdao Univ Sci & Technol Coll Chem Engn State Key Lab Base Ecochem Engn Qingdao 266042 Peoples R China Huanggang Normal Univ Sch Chem & Chem Engn Hubei Key Lab Proc & Applicat Catalyt Mat Huanggang 438000 Peoples R China

Bismuth-based materials have been identified as potential catalysts for electrochemical CO2 reduction reactions (CO2RR), however, there remain challenges in terms of selectivity and stability. In this study, we report a onestep etching hydrothermal strategy to synthesize a porous Si-doped hydrophobic flower-like BiOCl catalyst (PoSiBiOCl) for highly selective CO2RR to formate (HCOO-). The doped Si increases the hydrophobicity and porosity of BiOCl, improving CO2 adsorption and mass transport. The PoSi-BiOCl exhibits impressive CO2-to-formate selectivity (96%). Due to the hydrophobicity of PoSi-BiOCl, the side reaction of hydrogen evolution reaction (HER) is inhibited. Besides, after 24 h of stability testing, PoSi-BiOCl maintained a high FEHCOO- of about 85%, demonstrating its excellent catalytic stability. In situ Raman spectroscopy and DFT calculations show that Si doping shifts the p-band center (epsilon p) and significantly reduces the energy barrier of forming *OCHO intermediates, which is a key step in the CO2-to-formate transformation pathway.

关键词： BiOCl Si doping Hydrophobicity Electrocatalysis CO2 reduction

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Open Hollow Nut-like Co-PtSA Decorated with CoPt@C for Enhanced Hydrogen Evolution Reaction

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INORGANIC CHEMISTRY 2025年第9期64卷 4580-4591页

作者： Zhao, Gaoqiang Yan, Xiang Wang, Haipeng Zhang, Delu Sun, Fujin Li, Ziya Lv, Zhiguo Zhang, Chao Qingdao Univ Sci & Technol Coll Chem Engn State Key Lab Base Ecochem Engn Key Lab Multiphase Flow React & Separat Engn Shand Qingdao 266042 Peoples R China

Constructing an efficient open hollow nut-like Co-MOF/Pt-based electrocatalyst via a partial etching strategy remains challenging. In this study, a novel concurrent thermal polymerization-etching strategy is introduced to prepare a unique open hollow nut-like Co-PtSA decorated with a CoPt@C layer electrocatalyst (denoted as Co-PtSA/CoPt@C), exhibiting outstanding hydrogen evolution reaction performance. In Co-PtSA/CoPt@C, the distinctive open hollow nut-like Co-PtSA structure is encapsulated within a CoPt@C layer. The CoPt@C layer consists of CoPt@CNTs and a CoPt@C core-shell. Electrochemical tests demonstrate that Co-PtSA/CoPt@C exhibits remarkable catalytic performance, requiring only 13 mV of overpotential in 1 M KOH to achieve a current density of 10 mA cm-2. Additionally, the turnover frequency of Co-PtSA/CoPt@C reaches 0.169 s-1 at eta = 50 mV, 0.466 s-1 at eta = 100 mV, and 1.33 s-1 at eta = 200 mV, surpassing the performance of commercial 20% Pt/C. In addition, the adsorption Gibbs free energy for hydrogen on Co-PtSA/CoPt@C is notably low, with a value of -0.65 eV, which promotes efficient H2 formation.

关键词： Potassium hydroxide

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Bidirectional DC-DC Converter With Zero Current Ripple and Low Voltage Stress for Power Battery Equalization Systems

Bidirectional DC-DC Converter With Zero Current Ripple and L...

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Energy Storage and Conversion (ISESC), CPSS & IEEE International Symposium on

作者： Shan Miao Yang Jin Nawei Lyu Xin Jiang Mingchuan Wang School of Electrical and Information Engineering Zhengzhou University Zhengzhou China

ISBN: (数字)9798350380514

ISBN: (纸本)9798350380521

Active equalizer is a significant approach to break through the inconsistent charging of power batteries, which can improve the available capacity, endurance mileage and system safety of the electric vehicles. As the important part of active equalizer, a bidirectional converter which possesses zero current ripple on the high voltage side (HVS) and small current ripple on the low voltage side (LVS), low voltage stress with wider conversion ratio, common ground and positive polarity between the LVS and HVS, is proposed in this paper. Therefore, with the proposed converter, the improved efficiency, speed and reliability of the active equalizer can be realized. The operating principles of the converter in boost mode to achieve cell-to-string (C2S) equalization and in buck mode to complete string-to-cell (S2C) equalization are analyzed. Besides, the detailed mathematical model and related simulations are presented to verify the feasibility and effectiveness of the proposed converter in the equalization system.

关键词： Low voltage Equalizers Voltage DC-DC power converters High-voltage techniques Mathematical models Batteries Safety Reliability Stress

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Application of a Near-Infrared Fluorescence Probe Based on Perylene Bisimide in the Detection of Heparin

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LANGMUIR 2024年第50期40卷 26626-26632页

作者： Li, Yueji Zhang, Yuteng Liu, Xue Dong, Bin Xu, Pan Song, Bo Soochow Univ Coll Chem Chem Engn & Mat Sci Suzhou 215123 Peoples R China

Heparin is widely used to treat thrombosis because it is an effective anticoagulant. However, excessive use of heparin can lead to an increased risk of bleeding, which makes the quantitative detection of heparin very important. An amphiphilic perylene bisimide molecule (denoted PBI-9) was developed, which presented a near-infrared emission peak at 730 nm when it was aggregated. PBI-9 has been utilized in the detection of heparin, as the pyridine cation in PBI-9 binds strongly to highly sulfated heparin through electrostatic interactions. Charge neutralization triggers the self-assembly of PBI-9, which leads to an emission peak shift from 540 nm to 690 nm, corresponding to monomeric emission to excimer emission. This shift was applied for the detection of heparin. Importantly, the interaction between PBI-9 and heparin is not affected by protamine, resulting in high selectivity and minimal interference. PBI-9 is a promising tool for detecting heparin in clinical settings after excess heparin has been neutralized by protamine.

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Parametric modeling on warp and weft tensile strength prediction and progressive damage evolution of 3D angle-interlock woven composites

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COMPOSITE STRUCTURES 2025年 362卷

作者： Sun, Yi-xuan Yao, Tian-lei Yang, Xue Li, Dian-sen Jiang, Lei Zuo, Hong-mei V. Lomov, Stepan Desplentere, Frederik Beihang Univ Sch Chem Key Lab Bioinspired Smart Interfacial Sci & Techno Minist Educ Beijing 100191 Peoples R China Katholieke Univ Leuven Dept Mat Engn Leuven Belgium Beijing Univ Chem Technol State Key Lab Organ Inorgan Composites Beijing 100029 Peoples R China Anhui Polytech Univ Adv Fiber Mat Engn Res Ctr Anhui Prov Sch Text & Garment Wuhu 241000 Peoples R China

Considering the yarn extrusion and actual spatial structure of 3D angle-interlock woven composites(3DAWCs), a geometric equation is proposed and a parametric finite element model(FEM) is established to investigate the mesoscale tensile behavior. The results demonstrate the accurate prediction of tensile properties and progressive damage of 3DAWCs by the finite element model, with experimental data validating the effectiveness. Moreover, it is revealed that the tensile behavior exhibits a strong correlation with yarn density and loading direction. Under warp tensile load, strength and modulus exhibit a positive correlation with warp density while showing a negative correlation with weft density. Under weft tensile load, both strength and modulus increase as yarn density increases. Damage analysis reveals that warp tensile damage initially occurs at warp bends and weft edges, propagating from the interface between warp and matrix. With an increase in both warp and weft yarn densities, damage under weft tensile load distribution initiates from weft yarns before extending towards interfaces between warp/weft yarns and matrix.

关键词： 3D angle-interlock woven composites Finite element analysis Tensile properties Failure mechanism

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Compressive Mechanical Properties of Gradient Structured CrCoNi Medium-Entropy Alloy under High-Temperature and High-Strain-Rate Coupling

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JOURNAL OF MATERIALS engineering AND PERFORMANCE 2024年 1-12页

作者： Xu, Xiangqian Xu, Jianguo Shang, Xiongtao Guo, Xiaofan Wang, Lei Su, Shikai Xi, Yuntao Zhang, Keren Li, Jinguang Xu, Shanna Liu, Haitao Xiao, Xinke Zhang, Wei Liu, Ruifan Ji, Jiangtao Xian Shiyou Univ Sch Mat Sci & Engn Xian 710065 Peoples R China 2 Oil Prod Plant Changqing Oilfield Co Qingyang 745000 Peoples R China 10 Oil Prod Plant Changqing Oilfield Co Qingcheng 745100 Peoples R China Northeastern Univ State Key Lab Rolling & Automat Shenyang 110819 Peoples R China Tsinghua Univ State Key Lab Tribol Adv Equipment Beijing 100084 Peoples R China Xi An Jiao Tong Univ State Key Lab Mech Behav Mat Xian 710049 Peoples R China Nanyang Inst Technol Henan Int Joint Lab Dynam Impact & Disaster Engn S Nanyang 473004 Peoples R China Shaanxi Coal Ind New Energy Technol Co Ltd Xian 710199 Shaanxi Peoples R China Robert Gordon Univ Natl Subsea Ctr Aberdeen AB21 0BH Scotland Northwest Inst Nonferrous Met Res Xian 710016 Shaanxi Peoples R China China Railway First Survey & Design Inst Grp Co Lt Xian 710043 Shaanxi Peoples R China

CrCoNi medium-entropy alloys (MEA) exhibit excellent mechanical properties under low-temperature conditions, while these properties decrease at room temperature and high-temperature conditions. The mechanical properties under high-temperature and high-strain-rate coupling conditions have always been a key issue in the research of CrCoNi MEA as a structural material. On the basis of surface sliding friction plastic deformation of CrCoNi MEA to construct gradient structures, this study conducted dynamic compressive mechanical properties tests at room temperature, 100, 200, and 300 degrees C on homogeneous and gradient CrCoNi MEA, with strain rates controlled within the range of 2500-7000 s-1. The experimental results show that the gradient structure significantly improves the yield strength of CrCoNi MEA at various temperatures and strain rates, with almost no plastic loss. In addition, both homogeneous and gradient CrCoNi MEAs exhibit positive strain rate sensitivity, and strain rate sensitivity increases with increasing temperature. The higher the strain rate, the stronger the strain hardening performance of CrCoNi MEA, which is crucial for it to exhibit high strain rate.

关键词： compression properties CrCoNi high-temperature and high-strain-rate coupling medium-entropy alloy (MEA) surface friction treatment (SFT)

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Rh single atoms anchored in hollow microflower MoS2/sulfur-vacancy rich CdZnS with dual proton reduction sites for enhanced photocatalytic hydrogen generation

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JOURNAL OF COLLOID AND INTERFACE SCIENCE 2025年第Pt 2期684卷 207-214页

作者： Zhang, Delu Zhang, Chao Ma, Hongsheng Ye, Binhao Zhuang, Tao Lv, Zhiguo Qingdao Univ Sci & Technol Coll Chem Engn State Key Lab Base Ecochem Engn Key Lab Multiphase Flow React & Separat Engn Shand Qingdao 266042 Peoples R China Hainan Normal Univ Coll Phys & Elect Engn Key Lab Laser Technol & Optoelect Funct Mat Hainan Haikou 571158 Peoples R China

Modifying CdZnS with precious metal at the atomic scale is a promising approach for maximizing its photocatalytic performance. Herein, Rh single atoms (Rh1) were successfully anchored on hollow microflower MoS2/ sulfur-vacancy-rich CdZnS (CZS-SVs) to boost H2 generation. The optimal catalyst Rh1@MoS2/CZS-SVs reaches a H2 productivity of 39,827 mu mol h- 1 g- 1, representing 5.64 and 4.36-folds enhancement compared with pristine CZS and CZS-SVs, respectively. The enhanced H2 generation activity was due to Rh single atoms and sulfurvacancy defects, both of which can effectively promote carrier separation and prolong carrier lifespan. Notably, density functional theory (DFT) calculations suggest that introducing Rh single-atom sites on MoS2/ CZS-SVs significantly facilitated electron transfer, leading to efficient conversion of the H* intermediate to H2 (|Delta GH*| = 0.44 eV). Consistently, in situ Raman analysis confirmed Rh and S dual proton-reduction sites. Due to the accumulation of abundant electric charges, S atoms sites can also participate in H2 evolution process.

关键词： Rh single atoms Dual active sites Hollow microflower Sulfur-vacancy Photocatalytic hydrogen evolution

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Hydrophobic driving fabrication of highly dispersed PtNi in Zr-doped 3D hollow flower-like MgAl2O4 spheres with abundant O vacancies for enhanced dry reforming of methane

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JOURNAL OF COLLOID AND INTERFACE SCIENCE 2025年 685卷 244-254页

作者： Zhang, Chao Gao, Yongsheng Wang, Haipeng Jiang, Lulu Zhang, Delu Ming, Shujun Fu, Guangying Wang, Chao Lv, Zhiguo Qingdao Univ Sci & Technol Coll Chem Engn State Key Lab Base Ecochem Engn Qingdao 266042 Peoples R China Huanggang Normal Univ Sch Chem & Chem Engn Hubei Key Lab Proc & Applicat Catalyt Mat Huangzhou 438000 Peoples R China Chinese Acad Sci Qingdao Inst Bioenergy & Bioproc Technol Qingdao 266101 Peoples R China Wuhan Univ Technol State Key Lab Adv Technol Mat Synth & Proc Wuhan 430070 Peoples R China

The dry reforming of methane (DRM) could convert CH4 and CO2 into syngas, offering potential for greenhouse gas mitigation. However, DRM catalyst sintering and carbon deposition remain major obstacles. In this study, a highly dispersed PtNi alloy@Zr-doped 3D hollow flower-like MgAl2O4 (AMO) spheres was prepared through a hydrophobic driving strategy. During a 50-hour test at 550 degrees C, the catalyst exhibited no significant decline in CH4 and CO2 conversion rates, demonstrating its excellent anti-sintering and anti-coking performance. The unique anti-coking performance can be attributed to Zr-induced oxygen vacancies, which enhance oxygen mobility and reduce carbon deposition. Besides, doped Zr increases basic active sites, enhancing CO2 adsorption and activation, thus accelerating carbon species conversion. At 700 degrees C, the unique synergy between highly dispersed Pt and Ni enabled CH4 and CO2 conversion rates to reach 67.5 % and 73.8 %, respectively. The incorporation of Pt or Zr extends the Ni-Ni bond and partially coordinates with Ni, enhancing the stability of the Ni lattice. The reaction of CH4 and CO2 follows the Langmuir-Hinshelwood (L-H) mechanism, where both reactant molecules are adsorbed and activated on the metallic sites. Moreover, the effective energy barrier for the CH oxidation pathway is lower by 0.16 eV than that for the C oxidation pathway, which helps suppress the formation of carbon deposits.

关键词： PtNi alloy Carbon deposition resistance Oxygen vacancies Methane dry reforming

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Fabrication of Rigid Polyimide Foams with Superior Compressive Properties

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INDUSTRIAL & engineering CHEMISTRY RESEARCH 2022年第2期61卷 1089-1099页

作者： Luo, Yinfu Ni, Long Zhang, Xueqin Jiang, Xinyue Zou, Huawei Zhou, Shengtai Liang, Mei Liu, Pengbo Sichuan Univ Polymer Res Inst State Key Lab Polymer Mat Engn Chengdu 610065 Peoples R China

Rigid polyimide foams (PIFs) with excellent compressive and thermal properties were fabricated by thermal foaming of polyester ammonium salts (PEAS) precursors which were terminated by 5-norbornene-2,3-dicarboxylic anhydride (NA). The melt viscosities of PEAS precursors were found essential to obtaining PIFs with high closed cell ratios and improved interactions between foam cells, which were indispensable to improving mechanical properties. The room temperature compressive strength and compressive modulus of PIF (density: 146.3 kg m-3) with four repeating units reached 1.55 and 23.3 MPa, which were 7 and 9 times higher than that of PIF-infinity (230.9 kg m-3), respectively. Furthermore, the room temperature compressive strength of PIFs with foam densities of 358.3 kg m-3 reached 9.79 MPa. The PIFs demonstrated outstanding thermal properties with initial thermal degradation and glass transition temperatures higher than 450 and 290 degrees C, respectively. The thermal conductivities of PIFs fell in a range of 0.071-0.073 W m-1 K-1, which showed promising applications in the fields of aerospace, aeronautics, and marine use as high temperature-resistant structural materials.

关键词： Granular materials Foaming Precursors Viscosity Foams

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Simultaneously Geometrical and Electronic Modulation of L10-PtZn by Trace Ge Boosts High-performance Oxygen Reduction Reaction

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SMALL 2024年第15期20卷 2305296-2305296页

作者： Lu, Shaojie Hu, Yiping Xia, Fanjie Yang, Shaokang Jiang, Shuaihu Zhou, Yu Ma, Dongsheng Zhang, Wenjing Li, Jing Wu, Jinsong Rao, Dewei Yue, Qin Univ Elect Sci & Technol China Inst Fundamental & Frontier Sci Chengdu 610054 Peoples R China Wuhan Univ Technol State Key Lab Adv Technol Mat Synth & Proc NRC Nanostruct Res Ctr Wuhan 430070 Peoples R China Jiangsu Univ Sch Mat Sci & Engn Zhenjiang 212013 Peoples R China Chongqing Univ Dept Sch Chem & Chem Engn Chongqing 401331 Peoples R China

Developing a highly active, durable, and low-platinum-based electrocatalyst for the cathodic oxygen reduction reaction (ORR) is for breaking the bottleneck of large-scale applications of proton exchange membrane fuel cells (PEMFCs). Herein, ultrafine PtZn intermetallic nanoparticles with low Pt-loading and trace germanium (Ge) involvement confined in the nitrogen-doped porous carbon (Ge-L-10-PtZn@N-C) are reported. The Ge-L-10-PtZn@N-C exhibit superior ORR activity with a mass activity of 3.04 A mg(Pt)(-1) and specific activity of 4.69 mA cm(-2), approximate to 12.2- and 10.2-times improvement compared to the commercial Pt/C (20%) at 0.90 V in 0.1 m KOH. The cathodic catalyst Ge-L-10-PtZn@N-C assembled in the PEMFC shows encouraging peak power densities of 316.5 (at 0.86 V) and 417.2 mW cm(-2) (at 0.91 V) in alkaline and acidic fuel-cell, respectively. The combination of experiment and density functional theory calculations (DFT) results robustly reveal that the participation of trace Ge can not only trigger a "growth site locking effect" to effectively inhibit nanoparticle growth, bring miniature nanoparticles, enhance dispersion uniformity, and achieve the exposure of the more electrochemical active site, but also effectively modulates the electronic structure, hence optimizing the adsorption/desorption of the oxygen intermediates.

关键词： Ge doping intermetallic nanoparticles low-platinum oxygen reduction reactions proton exchange membrane fuel cells

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