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Metal-organic interface engineering for boosting the electroactivity of Pt nanodendrites for hydrogen production

Journal of Energy Chemistry 2020年第12期29卷 105-112页

作者： Juan Bai Nan jia Pujun Jin Pei Chen jia-xing jiang Jing-Hui Zeng Yu Chen Key Laboratory of Macromolecular Science of Shaanxi Province Key Laboratory of Applied Surface and Colloid Chemistry(MOE)Shaanxi Key Laboratory for Advanced Energy DevicesSchool of Materials Science and EngineeringShaanxi Normal UniversityXi'an 710062ShaanxiChina

Recently, the surface chemical functionalization and morphology control of precious metal nanostructures have been recognized as two efficient strategies for improving their electroactivity and/or selectivity. In this work, 1, 10-phenanthroline monohydrate(PM) functionalized Pt nanodendrites(Pt-NDs) on carbon cloth(CC)(denoted as PM@Pt-NDs/CC) and polyethylenimine(PEI) functionalized Pt-NDs on CC(denoted as PEI@Pt-NDs/CC) are successfully achieved by immersing Pt-NDs/CC into PM and PEI aqueous solutions, respectively. PEI functionalization of Pt-NDs/CC improves its electroactivity for hydrogen evolution reaction(HER) due to local proton enrichment whereas PM functionalization of Pt-NDs/CC improves its electroactivity for formic acid oxidation reaction(FAOR) by facilitating dehydrogenation pathway. With such high activity, a two-electrode electrolyzer is assembled using PM@Pt-NDs/CC as the anodic electrocatalyst and PEI@Pt-NDs/CC as the cathodic electrocatalyst for electrochemical reforming of formic acid, which only requires 0.45 V voltage to achieve the current density of 10 mA cm^(-1) for highpurity hydrogen production, much lower than conventional water electrolysis(1.59 V). The work presents an example of interfacial engineering enhancing electrocatalytic activity and indicates that electrochemical reforming of formic acid is an energy-saving electrochemical method for high-purity hydrogen production.

关键词： Pt nanodendrites Chemical functionalization Catalytic activity Hydrogen evolution reaction Formic acid oxidation reaction

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Tetra-armed conjugated microporous polymers for gas adsorption and photocatalytic hydrogen evolution

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Science China Chemistry 2017年第8期60卷 1075-1083页

作者： Yunfeng Xu Chong Zhang Pan Mu Na Mao Xue Wang Qian He Feng Wang jia-xing jiang Key Laboratory for Green Chemical Process of Ministry of Education Wuhan Institute of Technology Wuhan 430073 China

Two novel tetra-armed conjugated microporous polymers with different geometries have been designed and synthesized via Suzuki-Miyaura cross coupling polycondensation. Both polymers are stable in various organic solvents tested and are thermally stable. The pyrene-containing polymer of PrPy with the rigid pyrene unit shows a higher Brunauer-Emmet-Teller specific surface area of 1219m2g-1 than the tetraphenylethylene-containing polymer of PrTPE （770m2g 1）, which leads to a high CO2 uptake ability of 3.89mmolg I at 1.13bar/273K and a H2 uptake ability of 1.69wt% at 1.13bar/77K. The photocatalytic hydrogen production experiments revealed that PrPy also shows a better photocatalytic performance than PrTPE due to the higher conjugation degree and planar structure, the broader UV-visible （UV-Vis） absorption, the lower photoluminescence lifetime, and the higher specific surface area.

关键词： perylene conjugated mieroporous polymers gas adsorption hydrogen evolution

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A redox-active conjugated microporous polymer cathode for highperformance lithium/potassium-organic batteries

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Science China Chemistry 2021年第1期64卷 72-81页

作者： Lian-Wei Luo Chong Zhang Peixun Xiong Yongbo Zhao Wenyan Ma Yu Chen Jing Hui Zeng Yunhua Xu jia-xing jiang Key Laboratory for Macromolecular Science of Shaanxi Province Shaanxi Engineering Laboratory for Advanced Energy TechnologySchool of Materials Science and EngineeringShaanxi Normal UniversityXi'an 710062China Key Laboratory of Advanced Ceramics and Machining Technology of Ministry of Education Tianjin Key Laboratory of Composite and Functional MaterialsSchool of Materials Science and EngineeringTianjin UniversityTianjin 300072China

Organic redox-active materials have emerged as a class of electrode materials for rechargeable batteries due to their high redox activity,low cost,structure diversity and ***,the high solubility of organic small molecules in organic electrolytes commonly leads to the fast capacity decay with ***,we report a redox-active conjugated microporous polymer of poly(pyrene-co-anthraquinone)(Py Aq)cathode material consisting of pyrene and anthraquinone *** from the highly cross-linked polymer structure with insoluble nature in organic electrolytes,the high surface area and the plentiful redox-active carbonyl groups,the Py Aq cathode demonstrates outstanding electrochemical performances for both lithium-ion batteries(LIBs)and potassium-ion batteries(KIBs).Specifically,the Py Aq cathode for LIBs delivers a high reversible capacity of 169 m Ah g^-1 at the current density of 20 m A g^-1,a high rate capability(142 m Ah g^-1 at 1000 m A g^-1)and an excellent cycling stability for 4000 ***,the Py Aq cathode for KIBs also exhibits a high reversible capacity of143 m Ah g^-1 with a long cycling life over 800 *** excellent electrochemical performance demonstrates that the newly developed Py Aq could be an attractive cathode material for the advanced energy storage technologies.

关键词： conjugated microporous polymers anthraquinone organic cathode material lithium-ion battery potassium-ion battery

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Structure evolution of thiophene-containing conjugated polymer photocatalysts for high-efficiency photocatalytic hydrogen production

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Science China Materials 2022年第2期65卷 422-430页

作者： Sihui Xiang Changzhi Han Chang Shu Chong Zhang jia-xing jiang Key Laboratory for Macromolecular Science of Shaanxi Province Shaanxi Engineering Laboratory for Advanced Energy TechnologySchool of Materials Science and EngineeringShaanxi Normal UniversityXi’an 710062China

Conjugated polymer photocatalysts have received extensive attention in the field of photocatalytic hydrogen evolution owing to their tunable molecular structures and electronic ***,we developed three donoracceptor(D-A)type thiophene-containing narrow-band-gap conjugated polymers with pyrene as a donor and different fused-thiophene derivatives as acceptors via direct C-H arylation coupling *** was found that the band gap of the polymers can be tuned by adjusting the number of the fused-thiophene *** visible light absorption range can be extended by increasing the number of the thiophene rings,the planar molecular structure for both donor and acceptor units facilitates the charge transmission along the polymer skeleton,and the D-A type polymer structure promotes the dissociation of photo-induced electrons and *** a result,a high photocatalytic hydrogen evolution rate of 33.07 mmol h^(−1)g^(−1) was obtained by PyTP-2 with an optimized molecular structure under visible light irradiation(λ>420 nm)without the aid of Pt *** addition,PyTP-2 also shows a photocatalytic activity for oxygen evolution with an average oxygen evolution rate of 58.37µmol h^(−1)g^(−1).

关键词： conjugated polymer photocatalysis fused-thiophene ring hydrogen evolution oxygen evolution

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The electrolyte comprising more robust water and superhalides transforms Zn-metal anode reversibly and dendrite-free

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Carbon Energy 2021年第2期3卷 339-348页

作者： Chong Zhang Woochul Shin Liangdong Zhu Cheng Chen Joerg C.Neuefeind Yunkai Xu Sarah I.Allec Cong Liu Zhixuan Wei Aigerim Daniyar jia‐xing jiang Chong Fang P.Alex Greaney Xiulei Ji Key Laboratory of Applied Surface and Colloid Chemistry(Shaanxi Normal University) Ministry of EducationShaanxi Key Laboratory for Advanced Energy DevicesSchool of Materials Science and EngineeringShaanxi Normal UniversityXi'anShaanxiChina Department of Chemistry Oregon State UniversityCorvallisOregon Spallation Neutron Source Oak Ridge National LaboratoryOak RidgeTennessee Materials Science and Engineering University of CaliforniaRiversideCalifornia Argonne National Laboratory Chemical Sciences and Engineering DivisionLemontIllinois

A great challenge for all aqueous batteries,including Zn-metal batteries,is the parasitic hydrogen evolution reaction on the low-potential ***,we report the formula of a highly concentrated aqueous electrolyte that mitigates hydrogen evolution by transforming water molecules more *** electrolyte comprises primarily ZnCl_(2) and LiCl as an additive,both of which are inexpensive *** O-H covalent bonds in water get strengthened in a chemical environment that has fewer hydrogen bonding interactions and a greater number of Zn-Cl superhalides,as suggested by integrated characterization and *** a result,the average Coulombic efficiency of zincmetal anode is raised to an unprecedented>99.7%at 1mA cm^(−2).In the new electrolyte,the plating/stripping processes leave the zinc-metal anode dendrite-free,and the zinc-metal anode delivers stable plating/stripping cycles for 4000 hours with an areal capacity of 4 mAh cm^(−2) at 2mA cm^(−2).Furthermore,the high Coulombic efficiency of zinc-metal anode in the ZnCl_(2)-LiCl mixture electrolyte is demonstrated in full cells with a limited *** V_(2)O_(5)·H_(2)O||Zn full cell with an N/P mass ratio of 1.2 delivers a stable life of more than 2500 cycles,and the LiMn_(2)O_(4)||Zn hybrid cell with an N/P mass ratio of 0.6 exhibits 1500 cycles in its stable life.

关键词： LiCl reversibility stability water-in-salt electrolyte Zn anode ZnCl_(2)

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Current status of drug therapy for chronic hepatitis B

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World Journal of Gastroenterology 2025年第2期31卷 1-12页

作者： Chuang jiang Zhi-Hong Zhang jia-Xin Li Division of Liver Surgery Department of General Surgery and Laboratory of Liver Surgeryand State Key Laboratory of Biotherapy and Collaborative Innovation Center of BiotherapyWest China HospitalSichuan UniversityChengdu 610041Sichuan ProvinceChina Department of General Surgery Dafang County People's HospitalBijie 551600Guizhou ProvinceChina

In this editorial,we comment on the article by Meng et *** hepatitis B(CHB)is a significant global health problem,particularly in developing *** B virus(HBV)infection is one of the most important risk factors for cirrhosis and hepatocellular *** and treatment of HBV are key measures to reduce *** present,drug therapy can effectively control virus replication and slow disease progression,but completely eliminating the virus remains a ***-HBV treatment is a long-term process,and there are many kinds of antiviral drugs with different mechanisms of action,it is essential to evaluate the safety and efficacy of these drugs to reduce side effects and improve patients’*** will summarize the current status of CHB drug treatment,hoping to provide a reference for the selection of clinical antiviral drugs.

关键词： Chronic hepatitis B Hepatitis B virus Anti virus Drug treatment Therapy

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美丽乡村建设与农业遗产保护耦合发展研究

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中国农史 2017年第1期36卷 136-142页

作者：魏家星姜卫兵武涛南京农业大学园艺学院江苏南京210019

中国悠久的农业历史留下了丰富的农业遗产,农业遗产的保护对乡村建设及可持续发展等具有重要意义,随着近年来美丽乡村建设的如火如荼,如何在大规模建设中有效保护农业遗产已成为一个严峻而迫切的课题,本文剖析了美丽乡村建设与农业遗产... 详细信息

中国悠久的农业历史留下了丰富的农业遗产,农业遗产的保护对乡村建设及可持续发展等具有重要意义,随着近年来美丽乡村建设的如火如荼,如何在大规模建设中有效保护农业遗产已成为一个严峻而迫切的课题,本文剖析了美丽乡村建设与农业遗产保护的内在关系,从政府政绩、土地政策、规划水平、财政投入、管理体制等五个方面,探究美丽乡村建设对农业遗产保护的不利影响因素,最后提出了基于农业遗产保护的美丽乡村发展对策,以达到两者之间的耦合。

关键词：美丽乡村建设农业遗产保护耦合对策

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多运动站测角频差无源定位方法研究

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国防科技大学学报 2011年第1期33卷 76-80页

作者：贾兴江周一宇郭福成国防科技大学电子科学与工程学院湖南长沙410073

针对测角频差无源定位问题,提出了一种快速有效的解析定位方法,该方法通过引入中间量,将辐射源位置非线性估计问题转化成两个加权线性最小二乘估计问题,简化了定位解算。该方法无需进行参量搜索,比搜索法运算量小;无需初始值引导,比高斯... 详细信息

针对测角频差无源定位问题,提出了一种快速有效的解析定位方法,该方法通过引入中间量,将辐射源位置非线性估计问题转化成两个加权线性最小二乘估计问题,简化了定位解算。该方法无需进行参量搜索,比搜索法运算量小;无需初始值引导,比高斯-牛顿迭代法使用方便。在结构上,建立了观测模型,然后给出了辐射源定位误差对应的克拉美罗限,阐述了解析法的基本步骤及理论性能,仿真实验结果表明,当观测误差不太大时,解析法对应的定位误差能够有效逼近克拉美罗限。

关键词：多普勒效应最小二乘逼近非线性估计迭代法

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分布式电子干扰系统干扰效能分析与仿真

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海军工程大学学报 2006年第3期18卷 47-51页

作者：蔡小勇蒋兴舟贾兴江王建武海军工程大学兵器工程系湖北武汉430033 空军雷达学院湖北武汉430019

建立干扰条件下雷达探测威力模型,通过仿真分析了单干扰机和多干扰机条件下单部雷达探测威力范围.在此基础上,对干扰机连续布阵与间断布阵,在远、近的不同干扰距离上进行仿真,验证了实施空中分布式电子干扰能够形成干扰掩护通道的设想.

关键词：电子干扰分布式无人机效能

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三机无源定位阵面旋转效应仿真分析

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系统仿真学报 2010年第6期22卷 1402-1405,1410页

作者：贾兴江周一宇郭福成国防科学技术大学电子科学与工程学院长沙410073

针对三机三维布阵优化问题,以精度因子为目标函数,以阵面旋转为切入点,采用建模仿真方法,分析了阵面旋转效应对三机时差定位、频差定位及时频差定位精度的影响,直观地揭示了不同定位体制下的布阵优化规律。这些规律在下步工作中可作为... 详细信息

针对三机三维布阵优化问题,以精度因子为目标函数,以阵面旋转为切入点,采用建模仿真方法,分析了阵面旋转效应对三机时差定位、频差定位及时频差定位精度的影响,直观地揭示了不同定位体制下的布阵优化规律。这些规律在下步工作中可作为先验知识,与粒子群、模拟退火、遗传算法等最优化方法相结合,更精细地研究三机三维布阵优化问题。

关键词：无源定位旋转效应仿真时差频差

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