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Chinese Journal of Chemistry 2020年第3期38卷 275-281页

作者： Yina Zhao Wenlong Wu Baihe Fu Liyong Gan Zhonghai Zhang Shanghai Key Laboratory of Green Chemistry and Chemical Processes School of Chemistry and Molecular EngineeringEast China Normal University500 Dongchuan RoadShanghai 200241China Institute for Structure and Function and Deportment of Physics Chongqing UniversityChongqing 400030China

The accurate quantification of neurotransmitter molecules is an indispensable means to reveal the physiological mechanisms of neuro movement in molecular level.However,existing detection strategies cannot fully meet practical needs,and the on-site and in vivo detection of neurotransmitters in brain remains a great challenge.Here,we report the development of a near infrared light responsive photo-electrochemical(PEC)detection method for in vivo quantification of neurotransmitter dopamine in mouse brain.Under guidance of density function theory calculations,a combination strategy of non-metal cation doping and defect engineering is introduced to rationally design the micro-photoelec-trodes with excellent biocompatibility and stability and implements the in vivo PEC detection of dopamine in mouse brain.It opens up a new way for the accurate in vivo detection of biomolecules and allows researchers to make novel inquiries for long-standing questions in a new way.

关键词： Infrared Rational vivo

Regulating local coordination environment of Mg-Co single atom catalyst for improved direct methanol fuel cell cathode

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镁合金学报(英文) 2023年第6期11卷 1959-1969页

作者： Kaiwen Wang Hanjun Zou Jiazhi Meng Chaogang Ban Xue Liu Jiangping Ma Cong Wang Liyong Gan Xiaodong Han Xiaoyuan Zhou College of Physics and Center of Quantum Materials and Devices Chongqing UniversityChongqing 401331China Beijing Key Laboratory of Microstructure and Property of Advanced Materials Beijing University of TechnologyBeijing 100024China Institute of Emerging Energy Storage Materials and Equipment Chongqing 401135China Analytical and Testing Center Chongqing UniversityChongqing 401331China

Fuel cells operated with a reformate fuel such as methanol are promising power systems for portable electronic devices due to their high safety,high energy density and low pollutant emissions.However,several critical issues including methanol crossover effect,CO-tolerance electrode and efficient oxygen reduction electrocatalyst with low or non-platinum usage have to be addressed before the direct methanol fuel cells(DMFCs)become commercially available for industrial application.Here,we report a highly active and selective Mg-Co dualsite oxygen reduction reaction(ORR)single atom catalyst(SAC)with porous N-doped carbon as the substrate.The catalyst exhibits a commercial Pt/C-comparable half-wave potential of 0.806 V(versus the reversible hydrogen electrode)in acid media with good stability.Furthermore,practical DMFCs test achieves a peak power density of over 200 m W cm^(-2)that far exceeds that of commercial Pt/C counterpart(82 m W cm^(-2)).Particularly,the Mg-Co DMFC system runs over 10 h with negligible current loss under 10 M concentration methanol work condition.Experimental results and theoretical calculations reveal that the N atom coordinated by Mg and Co atom exhibits an unconventional d-band-ditto localized p-band and can promote the dissociation of the key intermediate*OOH into*O and*OH,which accounts for the near unity selective 4e-ORR reaction pathway and enhanced ORR activity.In contrast,the N atom in SAC–Co remains inert in the absorption and desorption of*OOH and*OH.This local coordination environment regulation strategy around active sites may promote rational design of high-performance and durable fuel cell cathode electrocatalysts.

关键词： Single atom catalyst Mg−N−Co DMFC Cathode

Isotype Heterojunction‑Boosted CO_(2) Photoreduction to CO

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Nano-Micro Letters 2022年第5期14卷 34-46页

作者： Chaogang Ban Youyu Duan Yang Wang Jiangping Ma Kaiwen Wang Jiazhi Meng Xue Liu Cong Wang Xiaodong Han Guozhong Cao Liyong Gan Xiaoyuan Zhou College of Physics and Center of Quantum Materials and Devices Chongqing UniversityChongqing 401331People’s Republic of China State Key Laboratory of Coal Mine Disaster Dynamics and Control Chongqing UniversityChongqing 401331People’s Republic of China Beijing Key Laboratory of Microstructure and Property of Advanced Materials Beijing University of TechnologyBeijing 100024People’s Republic of China Analytical and Testing Center Chongqing UniversityChongqing 401331People’s Republic of China Department of Materials Science and Engineering University of WashingtonSeattleWA 98195USA

Photocatalytic conversion of CO_(2) to high-value products plays a crucial role in the global pursuit of carbon–neutral economy.Junction photocatalysts,such as the isotype heterojunctions,offer an ideal paradigm to navigate the photocatalytic CO_(2) reduction reaction(CRR).Herein,we elucidate the behaviors of isotype heterojunctions toward photocatalytic CRR over a representative photocatalyst,g-C_(3)N_(4).Impressively,the isotype heterojunctions possess a significantly higher efficiency for the spatial separation and transfer of photogenerated carriers than the single components.Along with the intrinsically outstanding stability,the isotype heterojunctions exhibit an exceptional and stable activity toward the CO_(2) photoreduction to CO.More importantly,by combining quantitative in situ technique with the first-principles modeling,we elucidate that the enhanced photoinduced charge dynamics promotes the production of key intermediates and thus the whole reaction kinetics.

关键词： Isotype heterojunction g-C_(3)N_(4) CO_(2)photoreduction Charge dynamics Reaction mechanism

A new insight into the promoting effects of transition metal phosphides in methanol electrooxidation

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Chinese Chemical Letters 2023年第6期34卷 200-205页

作者： Junjie Ding Shaojie Jing Changqing Yin Chaogang Ban Kaiwen Wang Xue Liu Youyu Duan Yuxin Zhang Guang Han Liyong Gan Jinsong Rao College of Physics and Center of Quantum Materials and Devices Chongqing UniversityChongqing 401331China College of Material Science and Engineering Chongqing UniversityChongqing 400044China Beijing Key Laboratory of Microstructure and Property of Advanced Materials Beijing University of TechnologyBeijing 100024China

The construction of highly active catalysts for methanol oxidation reaction(MOR)is central to direct methanol fuel cells.Tremendous progress has been made in transition metal phosphides(TMPs)based catalysts.However,TMPs would be partially damaged and transformed into new substances(e.g.,Pt-M-P composite,where M represents a second transition metal)during Pt deposition process.This would pose a large obstacle to the cognition of the real promoting effects of TMPs in MOR.Herein,Co_(2)P co-catalysts(Pt-P/Co_(2)P@NPC,where NPC stands for N and P co-doped carbon)and Pt-Co-P composite catalysts(Pt-CoP/NPC)were controllably synthesized.Electrocatalysis tests show that the Pt-Co-P/NPC exhibits superior MOR activity as high as 1016 m A/mg_(Pt),significantly exceeding that of Pt-P/Co_(2)P@NPC(345 m A/mg_(Pt)).This result indicates that the promoting effect is ascribed primarily to the resultant Pt-Co-P composite,in sharply contrast to previous viewpoint that Co_(2)P itself improves the activity.Further mechanistic studies reveal that Pt-Co-P/NPC exhibits much stronger electron interaction and thus manifesting a remarkably weaker CO absorption than Pt-P/Co_(2)P@NPC and Pt/C.Moreover,Pt-Co-P is also more capable of producing oxygen-containing adsorbate and thus accelerating the removal of surface-bonded CO^(*),ultimately boosting the MOR performance.

关键词： Promoting effect Transition metal phosphides Pt-Co-P composite Catalytic mechanisms Methanol oxidation reaction

Bismuth clusters pinned on TiO_(2) porous nanowires boosting charge transfer for CO_(2) photoreduction to CH_(4)

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Nano Research 2024年第3期17卷 1190-1198页

作者： Jiazhi Meng Kaiwen Wang Yang Wang Jiangping Ma Chaogang Ban Yajie Feng Bin Zhang Kai Zhou Liyong Gan Guang Han Danmei Yu Xiaoyuan Zhou College of Physics and Institute of Advanced Interdisciplinary Studies Chongqing UniversityChongqing 401331China School of Chemistry and Chemical Engineering Chongqing UniversityChongqing 401331China College of Materials Science and Engineering Chongqing UniversityChongqing 400044China Beijing Key Lab of Microstructure and Properties of Advanced Materials Beijing University of TechnologyBeijing 100124China Analytical and Testing Center Chongqing UniversityChongqing 401331China

Artificial photosynthesis in carbon dioxide(CO_(2))conversion into value-added chemicals attracts considerable attention but suffers from the low activity induced by sluggish separation of photogenerated carriers and the kinetic bottleneck-induced unsatisfied selectivity.Herein,we prepare a new-style Bi/TiO_(2) catalyst formed by pinning bismuth clusters on TiO_(2) nanowires through being confined by pores,which exhibits high activity and selectivity towards photocatalytic production of CH_(4) from CO_(2).Boosted charge transfer from TiO_(2) through Bi to the reactants is revealed via in situ X-ray photon spectroscopy and time-resolved photoluminescence(PL).Further,in situ Fourier transform infrared results confirm that Bi/TiO_(2) not only overcomes the multi-electron kinetics challenge of CO_(2) to CH_(4) via boosting charge transfer,but also facilitates proton production and transfer as well as the intermediates*CHO and*CH_(3)O generation,ultimately achieving the tandem catalysis towards methanation.Theoretical calculation also underlies that the more favorable reaction step from*CO to*CHO on Bi/TiO_(2) results in CH_(4) production with higher selectivity.Our work brings new insights into rational design of photocatalysts with high performance and the formation mechanism of CO_(2) to CH_(4) for solar energy storage in future.

关键词： carbon dioxide(CO_(2))photoreduction charge transfer tandem catalysis methanation

A High-Capacity Ammonium Vanadate Cathode for Zinc-Ion Battery

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Nano-Micro Letters 2020年第5期12卷 153-164页

作者： Qifei Li Xianhong Rui Dong Chen Yuezhan Feng Ni Xiao Liyong Gan Qi Zhang Yan Yu Shaoming Huang Guangzhou Key Laboratory of Low-Dimensional Materials and Energy Storage Devices School of Materials and EnergyGuangdong University of TechnologyGuangzhou 510006People’s Republic of China Hefei National Laboratory for Physical Sciences at the Microscale Department of Materials Science and EngineeringCAS Key Laboratory of Materials for Energy ConversionUniversity of Science and Technology of ChinaHefei 230026People’s Republic of China Key Laboratory of Materials Processing and Mold(Zhengzhou University) Ministry of EducationZhengzhou UniversityZhengzhou 450002People’s Republic of China Aviation Fuel Research and Development Center China National Aviation Fuel Group LimitedBeijing 102603People’s Republic of China Department Institute for Structure and Function and of Physics Chongqing UniversityChongqing 400030People’s Republic of China Dalian National Laboratory for Clean Energy(DNL) Chinese Academy of SciencesDalian 116023LiaoningPeople’s Republic of China State Key Laboratory of Fire Science University of Science and Technology of ChinaHefei 230026People’s Republic of China

Given the advantages of being abundant in resources,environmental benign and highly safe,rechargeable zinc-ion batteries(ZIBs)enter the global spotlight for their potential utilization in large-scale energy storage.Despite their preliminary success,zinc-ion storage that is able to deliver capacity>400 mAh g^-1 remains a great challenge.Here,we demonstrate the viability of NH4V4O10(NVO)as high-capacity cathode that breaks through the bottleneck of ZIBs in limited capacity.The first-principles calculations reveal that layered NVO is a good host to provide fast Zn^2+ions diffusion channel along its[010]direction in the interlayer space.On the other hand,to further enhance Zn^2+ion intercalation kinetics and long-term cycling stability,a three-dimensional(3D)flower-like architecture that is self-assembled by NVO nanobelts(3D-NVO)is rationally designed and fabricated through a microwave-assisted hydrothermal method.As a result,such 3D-NVO cathode possesses high capacity(485 mAh g^-1)and superior long-term cycling performance(3000 times)at 10 A g^-1(~50 s to full discharge/charge).Additionally,based on the excellent 3D-NVO cathode,a quasi-solid-state ZIB with capacity of 378 mAh g^-1is developed.

关键词： Zinc-ion battery Ammonium vanadate NH4V4O10

陕西紫阳地区茶园土壤氟形态测定及影响茶叶氟含量主要因素

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岩矿测试 2024年第1期43卷 166-176页

作者：冯博鑫门倩妮甘黎明魏立勇刘玖芬何涛王鹏贺怡欣中国地质调查局西安矿产资源调查中心陕西西安710100 中国地质调查局自然资源综合调查指挥中心北京100055 中国地质大学(北京) 北京100055

氟在人体生长发育和骨骼代谢中起着重要作用,近年来通过饮茶摄入氟与人体健康的关系受到较大关注。本文以大巴山区紫阳县茶园土壤为研究对象,采集64组茶园土壤和对应茶叶样品,测定土壤理化性质、土壤氟形态、茶叶氟含量,通过多元回归分... 详细信息

氟在人体生长发育和骨骼代谢中起着重要作用,近年来通过饮茶摄入氟与人体健康的关系受到较大关注。本文以大巴山区紫阳县茶园土壤为研究对象,采集64组茶园土壤和对应茶叶样品,测定土壤理化性质、土壤氟形态、茶叶氟含量,通过多元回归分析建立了影响大巴山区茶叶氟含量的Freundlich模型,并检验了模型的预测精度。结果显示:①研究区茶园表层土壤氟含量范围为487.37~1120.78mg/kg,平均值为730.63mg/kg;研究区茶叶氟含量为31.23~112.49mg/kg,平均值为57.58mg/kg,所有样品均未超过农业标准(NY659-2003)限值;②研究区茶园土壤氟的形态分布为:残渣态>水溶态>有机态>铁锰结合态>可交换态,水溶态氟含量范围为5.27~23.15mg/kg,平均值为9.72mg/kg,远高于中国地氟病发生区水溶态氟的平均含量2.5mg/kg,说明研究区存在一定生态风险。土壤水溶态氟与茶叶氟含量有显著相关性(n=64,r=0.82,p<0.01),其余形态与茶叶氟含量无显著相关性;③以水溶态氟、CEC、交换性铝、有机质、pH五个因子为变量,构建了影响茶叶氟含量的多元回归方程,采用Freundlich模型预测茶叶氟含量,该模型可以解释86.0%的变异,通过验证模型的预测精度达到88.0%,总体来说预测效果较好。本研究结合土壤理化性质、土壤氟形态数据构建了预测茶叶氟的模型,并达到可靠程度,可以为紫阳地区及相似地区茶叶氟生态风险评价、指导绿色农业发展提供理论依据。

关键词：紫阳地区土壤氟茶叶氟土壤氟形态多元回归分析

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成型位置对硬质合金数控刀片微结构的影响

常州大学学报:自然科学版 2023年第5期35卷 8-15页

作者：姜波甘信峰陈丽勇王超乐天宋仁国常州大学材料科学与工程学院江苏常州213164 江苏省材料表面科学与技术重点实验室(常州大学) 江苏常州213164 株洲钻石切削刀具股份有限公司质控部湖南株洲412000 江西理工大学材料冶金化学学部江西赣州341000

以数控刀片SPMT120408-PM为对象,通过扫描电镜与电子背散射衍射技术,研究成型位置(刀尖与中性层)对合金内部微结构的影响。研究结果显示,成型位置对碳化钨(WC)颗粒形貌无明显影响,对粒度分布、∑2晶界、Co相类型影响显著。其成型位置刀... 详细信息

以数控刀片SPMT120408-PM为对象,通过扫描电镜与电子背散射衍射技术,研究成型位置(刀尖与中性层)对合金内部微结构的影响。研究结果显示,成型位置对碳化钨(WC)颗粒形貌无明显影响,对粒度分布、∑2晶界、Co相类型影响显著。其成型位置刀尖的WC当量粒径分布宽度显著大于中性层,中性层粒度更均匀且亚晶比例更高。刀尖与中性层重位点阵(CSL点阵)晶界均以∑2晶界为主,且刀尖∑2晶界长度百分比显著高于中性层。此外,成型位置影响高温稳定相fcc-Co向低温稳定相hcp-Co的转变,刀尖以fcc-Co与hcp-Co两相混合为主,中性层以hcp-Co为主。

关键词：数控刀片成型位置粒度分布晶界

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盘式制动器制动噪声的销-盘试验和分析

北京信息科技大学学报（自然科学版） 2019年第4期34卷 56-60页

作者：曾圣迪王国权丁干陈勇王立勇北京信息科技大学机电工程学院北京100192 北京信息科技大学北京电动车辆协同创新中心北京100192 北京信息科技大学现代测控技术教育部重点实验室北京100192

为了研究列车盘式制动器的制动噪声特征,根据缩比原理分别制成摩擦盘和销的试样,使用UMT-5型摩擦磨损试验机做销-盘试验,通过采集并分析声音信号,利用有限元分析软件ABAQUS对试验结果做数值模拟。结果表明:制动噪声的特征与试验开始时... 详细信息

为了研究列车盘式制动器的制动噪声特征,根据缩比原理分别制成摩擦盘和销的试样,使用UMT-5型摩擦磨损试验机做销-盘试验,通过采集并分析声音信号,利用有限元分析软件ABAQUS对试验结果做数值模拟。结果表明:制动噪声的特征与试验开始时摩擦盘的转速(制动初速)以及施加在摩擦副接触界面上的载荷有关。“高转速、大载荷”条件下的噪声对人耳听力影响最大。摩擦副在试验过程中存在应力分布不均的情况,应力集中造成系统持续的自激振动,进而产生噪声。

关键词：列车制动盘制动噪声销-盘试验接触应力

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人免疫缺陷病毒感染的实验室检测及进展

分子诊断与治疗杂志 2010年第4期2卷 284-288页

作者：郑磊贾立永干宁王前南方医科大学南方医院检验医学科临床快速诊断实验室广东广州510515 宁波大学宁波市新型功能材料及其制备科学国家重点实验室培育基地浙江宁波315211

实验室检测是诊断人免疫缺陷病毒感染的主要手段,可以从基因水平、蛋白水平和细胞水平进行检测。本文对HIV感染诊断的各种方法及进展作一概述。

关键词：人免疫缺陷病毒获得性免疫缺陷综合症实验室检测