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Exploring precursor effect in in-situ reconstruction of Bi metal organic-frameworks during CO_(2)electroreduction reaction to tailor formate selectivity towards 100%

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Science China Chemistry 2024年第7期67卷 2190-2198页

作者： Zhida Liu Qikui Fan Hang Huo Fanglei Yao xiaoping gao Jin Wang College of Materials Science and Engineering Shenzhen UniversityShenzhen 518071China College of Physics and Optoelectronic Engineering Shenzhen UniversityShenzhen 518060China Key Laboratory of Functional Molecular Solids Ministry of EducationCollege of Chemistry and Materials ScienceAnhui Normal UniversityWuhu 241002China Hefei National Research Center for Physical Sciences at the Microscale University of Science and Technology of ChinaHefei 230026China

Bi-based metal-organic frameworks(Bi-MOFs)as efficient catalysts for the CO_(2)electroreduction reaction(CRR)have been extensively investigated.It has been established that Bi-MOFs usually undergo in-situ transformation during the CRR,ultimately converting into Bi nanostructures.However,the effect of the MOF precursors on the structure of the derived Bi catalysts and consequently on their electrocatalytic properties has not been clearly elucidated.In this work,we prepared four variants of a novel Bi-MOF with different morphologies and dimensions,and explored the effects of the precursors on the resulting Bi catalysts and their CRR performance.A precursor-dependent in-situ transformation and its profound impact on tuning the CO_(2)-formate FE towards~100%have been revealed.Among the four examined variants,Bi-MOF with nanocube-like morphology(BiMOF-NC)is transformed into thin and flat Bi nanosheets capable of successfully enveloping the fibers of carbon paper(working electrode),while the other three variants with increased size and dodecahedral/octahedral geometry have been transformed into Bi nanoflowers,exposing a fair portion of the carbon fibers in the working electrode.Furthermore,the transformation rate was found to be dependent on the precursors and BiMOF-NC exhibited the highest rate of reconstruction compared with other samples.Consequently,the Bi catalyst derived from BiMOF-NC delivered a selectivity for the formate product of nearly 100%at-1.2 V(vs.reversible hydrogen electrode(RHE))and of over 95%in a wide potential range due to efficient suppression of the competing hydrogen evolution reaction(HER)over carbon fibers.The in-situ transformed BiMOFNC also demonstrated equivalently high formate selectivity at large current densities(≥100 mA cm^(-2))in flow cell reactors as that in H-type reactors,underscoring its potential for industrial applications.This work highlights the necessity of finely tuning the structural features of MOF precursors to achieve optimized electrocatalytic performance.

关键词： Bi-MOFs precursor effect in-situ transformation Bi nanosheets CO2-to-formate

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Acid-stable antimonate based catalysts for the electrocatalytic oxygen evolution reaction

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Nano Research 2023年第4期16卷 4691-4697页

作者： xiaoping gao Huang Zhou Zhe Wang Gang Zhou Jin Wang Yuen Wu College of Materials Science and Engineering Shenzhen UniversityShenzhen 518071China School of Chemistry and Materials Science University of Science and Technology of ChinaHefei 230026China Preservation Technology Advanced Research CenterHefei Hualing Co.LtdHefei 230000China School of Science Hubei University of TechnologyWuhan 430068China

Acid-stable and highly active catalysts for the electrocatalytic oxygen evolution reaction(OER)are paramount to the advancement of electrochemical technologies for clean energy conversion and utilization.In this work,based on the density functional theory(DFT)calculations,we systematically investigated the MSb_(2)O_(6)(M=Fe,Co,and Ni)and transition metal(TM)doped MSb_(2)O_(6)(TM-MSb_(2)O_(6),TM=Mn,Fe,Co,Ni,Cu,Zn,Ru,Rh,Pd,Ir,and Pt)as potential antimonate-based electrocatalysts for the OER.The stability and OER activity of these considered electrocatalysts were systematically studied under acidic conditions.It was found that Rh-NiSb_(2)O_(6),Pt-CoSb_(2)O_(6),Rh-FeSbO4,and Co-NiSb_(2)O_(6)can serve as efficient and stable OER electrocatalysts,and their OER catalytic activities are better than that of the current state-of-the-art OER catalyst(IrO2).Our findings highlight a family of promising antimonate-based OER electrocatalysts for future experimental verification.

关键词： oxygen evolution reaction antimonates acid-stable oxides electrocatalysis density functional theory

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Surface modification of MoS_(2) nanosheets by single Ni atom for ultrasensitive dopamine detection

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Nano Research 2023年第1期16卷 917-924页

作者： Xuejiao Sun Cai Chen Can Xiong Congmin Zhang Xusheng Zheng Jin Wang xiaoping gao Zhen-Qiang Yu Yuen Wu College of Chemistry and Environmental Engineering Institute of Low-dimensional Materials Genome InitiativeShenzhen UniversityShenzhen 518071China School of Chemistry and Materials Science University of Science and Technology of ChinaHefei 230026China College of Materials Science and Engineering Shenzhen UniversityShenzhen 518071China Dalian National Laboratory for Clean Energy Dalian 116023China National Synchrotron Radiation Laboratory University of Science and Technology of ChinaHefei 230029China

Single atom catalysts have been recognized as potential catalysts to fabricate electrochemical biosensors,due to their unexpected catalytic selectivity and activity.Here,we designed and fabricated an ultrasensitive dopamine(DA)sensor based on the flower-like MoS_(2) embellished with single Ni site catalyst(Ni-MoS_(2)).The limit of detection could achieve 1 pM in phosphate buffer solution(PBS,pH=7.4),1 pM in bovine serum(pH=7.4),and 100 pM in artificial urine(pH=6.8).The excellent sensing performance was attributed to the Ni single atom axial anchoring on the Mo atom in the MoS_(2) basal plane with the Ni-S_(3) structure.Both the experiment and density functional theory(DFT)results certify that this structural feature is more favorable for the adsorption and electron transfer of DA on Ni atoms.The high proportion of Ni active sites on MoS_(2) basal plane effectively enhanced the intrinsic electronic conductivity and electrochemical activity toward DA.The successful establishment of this sensor gives a new guide to expand the field of single atom catalyst in the application of biosensors.

关键词： single atom catalysts MoS_(2) dopamine(DA)sensor serum urine

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政府职能转变中的公共服务能力研究——兼论《地方政府公共服务能力差异性的结构比较分析》的创新

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中国行政管理 2024年第3期40卷 63-71页

作者：高小平中国行政管理学会北京100017

我国政府职能转变的研究从提出“职能”概念开始,经历了“经济职能转变”“加强公共管理职能”“公共服务职能优先”三个理论阶段,与实践中的“计划导向型”向“市场导向型”转变、“管制型”向“服务型”转变、“适应型”向“自主型”... 详细信息

我国政府职能转变的研究从提出“职能”概念开始,经历了“经济职能转变”“加强公共管理职能”“公共服务职能优先”三个理论阶段,与实践中的“计划导向型”向“市场导向型”转变、“管制型”向“服务型”转变、“适应型”向“自主型”转变的过程基本同步。当前,地方政府面临着公共服务能力不足的挑战。创新体制机制、释放社会活力、应用现代科技特别是数字技术,提升公共服务需求管理能力、资源保障能力和资源整合能力,必将重塑公共服务能力结构和功能,促进政府职能转变,加快面向治理现代化的服务型政府建设。以地方政府公共服务供给能力差异性研究作为“小切口”,有助于做好政府职能转变这篇“大文章”,促进经济增长和社会福祉增进。

关键词：公共服务能力职能转变地方政府差异性

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Rechargeable Zn-air batteries initiated by nickel–cobalt bimetallic selenide

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Journal of Energy Chemistry 2019年第11期28卷 34-40页

作者： Changqi Sun Xiaosong Guo Jingyan Zhang Genliang Han Daqiang gao xiaoping gao Key Laboratory of Sensor and Sensing Technology Gansu Academy of SciencesLanzhou 730000GansuChina College of Materials Science and Engineering Qingdao University of Science and TechnologyQingdao 266061ShandongChina Key Laboratory for Magnetism and Magnetic Materials of MOE Key Laboratory of Special Function Materials and Structure Design of MOELanzhou UniversityLanzhou 730000GansuChina

A Zn-air battery is a potential next-generation energy storage device owing to its extremely high theoretical energy density. Currently, it is important to explore non-precious metal electrocatalysts with high electroactivity and stability in the oxygen reduction reaction(ORR) and oxygen evolution reaction(OER) for the development of Zn-air batteries. In this work, porous(Ni,Co)Se2 nanosheets were synthesized by selenizing Ni Co2O4 nanosheets. By regulating the conductivity and morphology of the sample, the prepared porous(Ni,Co)Se2 nanosheets show enhanced electrocatalytic activity for OER and ORR compared to Ni Co2O4 nanosheets. The aqueous Zn-air battery using porous(Ni,Co)Se2 nanosheets as the air cathode exhibits superior charge and discharge performance(1.98 V for charging and 1.17 V for discharging), high specific capacity(770 m Ah/g), and excellent cycle stability(140 h). These results indicate that the porous(Ni,Co)Se2 nanosheets are suitable as a bifunctional electrocatalyst for future Zn-air batteries.

关键词： Electrocatalyst Zn-air batteries Oxygen evolution reaction Oxygen reduction reaction

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基底动脉尖动脉瘤栓塞术后并发颈髓梗死2例

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中华放射学杂志 2024年第6期58卷 670-672页

作者：张欢高小平梁辉谢春湖南省人民医院(湖南师范大学附属第一医院)神经内科长沙410005

颈髓梗死是神经介入手术罕见且非常严重的并发症。本文报道2例基底动脉尖动脉瘤栓塞术后并发颈髓梗死患者,1例死亡,1例遗留严重残疾且需呼吸机辅助转回当地医院。2例患者双侧椎动脉均势,术中均在导引导管到位后出现椎动脉内血流淤滞未... 详细信息

颈髓梗死是神经介入手术罕见且非常严重的并发症。本文报道2例基底动脉尖动脉瘤栓塞术后并发颈髓梗死患者,1例死亡,1例遗留严重残疾且需呼吸机辅助转回当地医院。2例患者双侧椎动脉均势,术中均在导引导管到位后出现椎动脉内血流淤滞未予重视,颈髓梗死考虑与脊髓供血动脉低灌注/微栓塞有关。后循环病变介入手术过程中保证路径侧椎动脉前向血流通畅是避免颈髓梗死的关键。

关键词：动脉瘤基底动脉尖颈髓梗死神经介入并发症

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过硫酸铵浓度对PAN/PANI纳米纤维膜电磁屏蔽性能的影响

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现代纺织技术 2024年第5期32卷 1-8页

作者：苏祺高燕高晓平杨博琛内蒙古工业大学轻工与纺织学院呼和浩特010080 鄂尔多斯职业学院机电工程系内蒙古鄂尔多斯017004

为了探讨过硫酸铵(APS)浓度对聚丙烯腈(PAN)/聚苯胺(PANI)纳米纤维膜电磁屏蔽性能的影响,得到电磁屏蔽性能更加优异的复合纳米纤维膜,基于静电纺丝技术,选用PAN纳米纤维膜为原料并浸入苯胺(An)酸溶液中,加入不同浓度的氧化剂APS,采用原... 详细信息

为了探讨过硫酸铵(APS)浓度对聚丙烯腈(PAN)/聚苯胺(PANI)纳米纤维膜电磁屏蔽性能的影响,得到电磁屏蔽性能更加优异的复合纳米纤维膜,基于静电纺丝技术,选用PAN纳米纤维膜为原料并浸入苯胺(An)酸溶液中,加入不同浓度的氧化剂APS,采用原位聚合方法制备出PAN/PANI复合纳米纤维膜。对PAN/PANI复合纳米纤维膜的微观结构、增重率、电阻性能和电磁屏蔽性能进行测试,应用回归分析方法,确定最佳的APS浓度。结果表明:氧化剂浓度为0.3 mol/L时,PAN纤维表面聚合的PANI紧密均匀,形成了良好的导电网络结构,屏蔽效能最佳。采用原位聚合方法可以制备出具有优异防电磁辐射性能的PAN/PANI复合纳米纤维膜,为进一步开发具有电磁屏蔽性能的功能性纳米纤维纺织品奠定基础。

关键词：防电磁辐射性能导电性能聚丙烯腈聚苯胺纳米纤维

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Safety and efficacy of Edaravone Dexborneol versus edaravone for patients with acute ischaemic stroke: a phase Ⅱ, multicentre, randomised, double-blind, multiple-dose, active-controlled clinical trial

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Stroke & Vascular Neurology 2019年第3期4卷 109-114页

作者： Jie Xu Yilong Wang Anxin Wang Zhiqiang gao xiaoping gao Huisheng Chen Junshan Zhou Xingquan Zhao Yongjun Wang Department of Neurology Beijing Tiantan HospitalCapital Medical UniversityBeijingChina China National Clinical Research Center for Neurological Diseases BeijingChina Department of Neurology The Second Affiliated Hospital of Nanjing Medical UniversityNanjingChina Department of Neurology The First Affiliated Hospital of Hunan Normal UniversityChangshaChina Department of Neurology General HospitalPLA Shenyang Military RegionShenyangChina Department of Neurology Nanjing First HospitalNanjing Medical UniversityNanjingChina

Background Edaravone Dexborneol is a novel neuroprotective agent that comprised edaravone and(+)-borneol,a food additive with an anti-inflammatory effect in animal ischaemic stroke models.This study aims to assess the safety and efficacy of Edaravone Dexborneol compared with edaravone in treating patients with acute ischaemic stroke(AIS).Methods In this multicentre,randomised,double-blind,multiple-dose,active-controlled,phaseⅡclinical trial,patients with AIS within 48 hours after stroke onset were randomly assigned(1:1:1:1)to low-dose(12.5 mg),medium-dose(37.5 mg)or high-dose(62.5 mg)Edaravone Dexborneol groups,and an active control group with edaravone(30 mg)by 30 min intravenous infusion every 12 hours,for 14 consecutive days.The primary efficacy outcome was the proportion of modified Rankin Scale(mRS)score≤1 at 90 days and National Institutes of Health Stroke Scale(NIHSS)score change from baseline to 14 days after randomisation.The safety outcome included any adverse event during 90 days after treatment.Results Of 385 patients included in the efficacy analysis,94 were randomised to low-dose group,97 to medium-dose group,98 to high-dose group and 96 to the control group.No significant difference was observed among the four groups on mRS score(mRS≤1,p=0.4054)at 90 days or NIHSS score change at 14 days(p=0.6799).However,a numerically higher percentage of patients with mRSscore≤1 at 90 days in the medium-dose(69.39%)and high-dose(65.63%)groups was observed than in the control group(60.64%).No significant difference in severe adverse events was found among the four groups(p=0.3815).Conclusions Compared with edaravone alone,Edaravone Dexborneol was safe and well tolerated at all doses,although no significant improvement in functional outcomes was observed at 90days.

关键词： patients doses protective

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Layered Double Hydroxides Derived ZnO-Al2O3 Supported Pd-Ag Catalysts for Selective Hydrogenation of Acetylene

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Chinese Journal of Chemistry 2017年第6期35卷 1009-1015页

作者： xiaoping gao Yanan Zhou Fangli Jing Jingjie Luo Qingsong Huang Wei Chu School of Chemical Engineering Sichuan University Chengdu Sichuan 610065 China Institute of New Energy and Low-Carbon Technology Sichuan University Chengdu Sichuan 610207 China Shenyang National LaboratoryJor Materials Science Institute of Metal Research Chinese Academy of Sciences Shenyang Liaoning 110016 China

ZnO-Al2O3 derived from layered double hydroxides （ZnAl-LDH） was successfully applied for dispersion of Pd-Ag bimetallic catalysts for the selective hydrogenation of acetylene to ethylene and the Pd-Ag/ZnO-Al2O3 cata- lyst showed the best catalytic performance among the prepared samples. It was found that the catalyst carrier of ZnO-Al2O3 metal-oxides derived form ZnAl-LDH could significantly suppress the over-hydrogenation of acetylene to obtain the relatively higher selectivity of ethylene. The introduction of Ag restricted efficiently the formation of coke because of the oligomerization reaction, which was further evidenced by thermal gravimetric analysis. The se- lectivity towards ethylene was in the order of Pd-Ag/ZnO-Al2O3〉Pd/ZnO-Al2O3〉Pd-Ag/Al2O3〉Pd/Al2O3 at a high conversion level. As the thermal gravimetric and differential temperature analysis （TG-DTA） revealed, Pd-Ag intermetallic catalyst on the ZnO-Al2O3 support showed less coke formation.

关键词： ZnAl-LDH Pd catalyst Ag promoter acetylene selective hydrogenation high selectivity

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电流差动保护在海上风电低频送出线路中的适应性分析

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电力系统自动化 2024年第1期48卷 131-139页

作者：蒋嘉桁张晨浩宋国兵高校平吕艺超吴通华西安交通大学电气工程学院陕西省西安市710049 南瑞集团有限公司(国网电力科学研究院有限公司) 江苏省南京市211106 河海大学能源与电气学院江苏省南京市210098

低频输电技术在中远距离海上风电领域应用潜力巨大。电流差动保护是广泛应用的传统交流保护,面对电力电子型电源时其性能可能受到影响,故有必要研究其在海上风电低频输电系统中的适应性。文中基于故障复合序网推导了直驱风机和模块化多... 详细信息

低频输电技术在中远距离海上风电领域应用潜力巨大。电流差动保护是广泛应用的传统交流保护,面对电力电子型电源时其性能可能受到影响,故有必要研究其在海上风电低频输电系统中的适应性。文中基于故障复合序网推导了直驱风机和模块化多电平矩阵换流器的电源特性对故障电流的影响,理论分析了电流差动保护的适应性。为定量分析保护适应性,提出了基于改进节点方程的故障电气量计算方法,计算给定故障条件下的故障电流和保护判据取值,判断保护动作情况。研究表明,单相接地和两相短路时保护灵敏度降低,甚至可能拒动;两相接地和三相短路时,保护能正常动作。最后,建立PSCAD/EMTDC仿真模型验证了理论分析和计算方法的正确性。

关键词：海上风电低频输电电流差动保护保护适应性直驱风机模块化多电平矩阵换流器

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