检索结果-南通市图书馆

Plasma induced grain boundaries to boost electrochemical reduction of CO2 to formate

Journal of Energy Chemistry 2024年第8期95卷 636-643页

作者： Guan Wang Shengtao Zhong Xiaoqian Xiong Jing Li Fangyuan Wang Li Huo daoxiong wu Xingqi Han Zhitong Wang Qi Chen Xinlong Tian Peilin Deng School of Marine Science and Engineering State Key Laboratory of Marine Resource Utilization in South China Sea Hainan University

Bismuth-based catalysts are highly promising for the electrochemical carbon dioxide reduction reaction（eCO2RR） to formate product.However,achieving high activity and selectivity towards formate and ensuring long-term stability remains challenging.This work reports the oxygen plasma inducing strategy to construct the abundant grain boundaries of Bi/BiOxon ultrathin two-dimensional Bi nanosheets.The oxygen plasma-treated Bi nanosheet（OP-Bi） exhibits over 90% Faradaic efficiency（FE） for formate at a wide potential range from-0.5 to-1.1 V,and maintains a great stability catalytic performance without significant decay over 30 h in flow cell.Moreover,membrane electrode assembly（MEA） device with OPBi as catalyst sustains the robust current density of 100 mA cm-2over 50 h,maintaining a formate FE above 90%.In addition,rechargeable Zn-CO2battery presents the peak power density of1.22 mW cm-2with OP-Bi as bifunctional catalyst.The mechanism experiments demonstrate that the high-density grain boundaries of OP-Bi provide more exposed active sites,faster electron transfer capacity,and the stronger intrinsic activity of Bi atoms.In situ spectroscopy and theo retical calculations further elucidate that the unsaturated Bi coordination atoms between the grain boundaries can effectively activate CO2molecules through elongating the C-O bond,and reducing the formation energy barrier of the key intermediate（*OCOH）,thereby enhancing the catalytic performance of eCO2RR to formate product.

关键词： Bi nanosheet CO2 electroreduction Grain boundary MEA device Unsaturation Bi atoms

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Introducing sulfur to nickel-iron selenide for high-efficiency alkaline seawater electrolysis

引用

Science China Chemistry 2024年第8期 2747-2754页

作者： Xuanwa Chen Yanhui Yu Xingqi Han Huan Wang Yingjie Hua daoxiong wu Peilin Deng Juanxiu Xiao Xinlong Tian Jing Li School of Marine Science and Engineering Hainan Provincial Key Lab of Fine Chemistry School of Chemistry and Chemical EngineeringHainan University Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education) College of Chemistry Nankai University Key Laboratory of Electrochemical Energy Storage and Energy Conversion of Hainan Province School of Chemistry and Chemical Engineering Hainan Normal University

Seawater electrolysis is an effective way to obtain hydrogen（H2） in a sustainable manner. However, the lack of electrocatalysts with high activity, stability, and selectivity for oxygen evolution reaction（OER） severely hinders the development of seawater electrolysis technology. Herein, sulfur-doped nickel-iron selenide nanosheets（S-NiFeSe2） were prepared by an ion-exchange strategy and served as highly active OER electrocatalyst for alkaline seawater electrolysis. The overpotential is 367 m V, and it can run stably for over 50 h at 100 m A cm-2. Excitingly, the S-NiFeSe2||Pt/C pair exhibits cell voltage of 1.54 V at 10 m A cm-2under alkaline seawater conditions, which can run smoothly for 100 h without decay, and the efficiency of electricity-tohydrogen（ETH） energy conversion reaches more than 80%. Such electrode, with abundant accessible reactive sites and good corrosion resistance, is a good candidate for seawater electrolysis. Moreover, density functional theory calculations reveal that the surface sulfur atoms can activate the adjacent Ni sites and decrease the free energy changes of the associated intermediates at the adjacent Ni sites for OER, and the step of*OH →*O is the potential rate-limiting step. In this work, the true reactive site in nickel-iron selenides is the Ni sites, but not the Fe sites as commonly believed.

关键词：

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Isolated Co Atoms Anchored on Defective Nitrogen-doped Carbon Graphene as Efficient Oxygen Reduction Reaction Electrocatalysts

引用

Energy & Environmental Materials 2023年第3期6卷 144-149页

作者： Peng Rao Junming Luo daoxiong wu Jing Li Qi Chen Peilin Deng Yijun Shen Xinlong Tian State Key Laboratory of Marine Resource Utilization in South China Sea Hainan Provincial Key Lab of Fine ChemistrySchool of Chemical Engineering and TechnologyHainan UniversityHaikou 570228China

Oxygen reduction reaction(ORR)is the heart of many new energy conversions and storage devices,such as metal-air batteries and fuel cells.However,ORR is currently facing the dilemma of sluggish intrinsic kinetics and the noble electrocatalysts of high price and low reserves.In this work,isolated Co atoms anchored on defective nitrogen-doped carbon graphene single-atom catalyst(Co-SAC/NC)are synthesized via the proposed movable type printing method.The prepared Co-SAC/NC catalyst demonstrates admirable ORR performance,with a high half-wave potential of 0.884 V in alkaline electrolytes and outstanding durability.In addition,an assembled zinc–air battery with prepared Co-SAC/NC as air-cathode catalyst displays a high-peak power density of 179 mW cm^(-2)and a high-specific capacity(757 mAh g^(-1)).Density functional theory calculations confirm that the true active sites of the prepared catalyst are Co-N_(4)moieties,and further reveal a significantly electronic structure evolution of Co sites in the ORR process,in which the project density of states and local magnetic moment of Co atom varies during its whole reaction process.This work not only paves a new avenue for synthesizing SACs as robust electrocatalysts,but also provides an electronic-level insight into the evolution of the electronic structure of single-atom catalysts.

关键词： movable type printing method oxygen reduction reaction single-atom catalyst zinc-air battery

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

General approach for atomically dispersed precious metal catalysts toward hydrogen reaction

引用

Carbon Energy 2023年第7期5卷 100-111页

作者： Ruisong Li daoxiong wu Peng Rao Peilin Deng Jing Li Junming Luo Wei Huang Qi Chen Zhenye Kang Yijun Shen Xinlong Tian State Key Laboratory of Marine Resource Utilization in South China Sea Hainan Provincial Key Lab of Fine ChemistrySchool of Chemical Engineering and TechnologyHainan UniversityHaikouChina

As a carbon-free energy carrier,hydrogen has become the pivot for future clean energy,while efficient hydrogen production and combustion still require precious metal-based catalysts.Single-atom catalysts(SACs)with high atomic utilization open up a desirable perspective for the scale applications of precious metals,but the general and facile preparation of various precious metal-based SACs remains challenging.Herein,a general movable printing method has been developed to synthesize various precious metal-based SACs,such as Pd,Pt,Rh,Ir,and Ru,and the features of highly dispersed single atoms with nitrogen coordination have been identified by comprehensive characterizations.More importantly,the synthesized Pt-and Ru-based SACs exhibit much higher activities than their corresponding nanoparticle counterparts for hydrogen oxidation reaction and hydrogen evolution reaction(HER).In addition,the Pd-based SAC delivers an excellent activity for photocatalytic hydrogen evolution.Especially for the superior mass activity of Ru-based SACs toward HER,density functional theory calculations confirmed that the adsorption of the hydrogen atom has a significant effect on the spin state and electronic structure of the catalysts.

关键词： hydrogen evolution reaction hydrogen oxidation reaction photocatalytic hydrogen evolution reaction precious metals single-atom catalysts

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Rational design ternary platinum based electrocatalysts for effective methanol oxidation reaction

引用

Journal of Energy Chemistry 2022年第7期31卷 230-235,I0007页

作者： Hao Tian daoxiong wu Jing Li Junming Luo Chunman Jia Zhongxin Liu Wei Huang Qi Chen Chong Michael Shim Peilin Deng Yijun Shen Xinlong Tian State Key Laboratory of Marine Resource Utilization in South China Sea Hainan Provincial Key Lab of Fine ChemistrySchool of Chemical Engineering and TechnologyHainan UniversityHaikou 570228HainanChina

Exploring effective, durable, and affordable electrocatalysts of methanol oxidation reaction(MOR) is of vital significance for the industrial application of direct methanol fuel cells. Herein, an efficient, general,and expandable method is developed to synthesis two-dimensional(2D) ternary Pt Bi M nanoplates(NPLs), in which various M(Co, Ni, Cu, Zn, Sn) is severed as the third component to the binary Pt Bi system. The MOR performance of Pt Bi M NPLs is entirely investigated, demonstrating that both the MOR activity and durability is enhanced with the introduction of the additional composition. Pt3Bi3Zn NPLs shows much higher MOR activity and stability than that of the Pt Bi counterparts, not to mention the current advanced Pt Ru/C and Pt/C catalysts. The prominent performances are attributed to the modulated electronic structure of the surface Pt in Pt Bi NPLs by the addition of Zn, resulting in a weakened affination between Pt and the adsorbed poisoning species(mainly CO) compared with Pt Bi NPLs, verified by density functional theory(DFT) calculations. In addition, the absorbed OH can be generated on the surface of Zn atom due to its favorable water activation properties, thus the CO removal on the adjacent Pt atoms is accelerated, further leading to a high activity and anti-poisoning performance of the resulting Pt_(3)Bi_(3)Zn catalyst. This work provides new insights and robust strategy for highly efficient MOR electrocatalyst with extraordinary anti-poisoning performance and stability.

关键词： Fuel cells Ternary nanoplates Durability Methanol oxidation reaction Anti-poisoning

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Single atomic cobalt electrocatalyst for efficient oxygen reduction reaction

引用

eScience 2022年第4期2卷 399-404页

作者： Peng Rao daoxiong wu Tian-Jiao Wang Jing Li Peilin Deng Qi Chen Yijun Shen Yu Chen Xinlong Tian State Key Laboratory of Marine Resource Utilization in South China Sea Hainan Provincial Key Lab of Fine ChemistrySchool of Chemical Engineering and TechnologyHainan UniversityHaikou570228China School of Materials Science and Engineering Shaanxi Normal UniversityXi'an710062China

Robust oxygen reduction reaction(ORR)catalysts are essential for energy storage and conversion devices,but their development remains challenging.Herein,we design a single-atom catalyst featuring isolated Co anchored on nitrogen-doped carbon(Co-SAC/NC)via a highly efficient“plasma-bombing”strategy.With a high loading(up to 2.5wt%),the well-dispersed single Co atoms in Co-SAC/NC give it robust ORR performance in an alkaline medium.It also demonstrates excellent battery performance when implemented as the air-cathode catalyst in a zinc-air battery(ZAB).Theoretical calculations reveal that the Co-N_(4)moiety experiences an“extraction/recovery”structural evolution during the ORR process,and the reaction's rate-determining step is the formation of OOH∗(reaction intermediate).This work provides a new strategy for designing robust ORR catalysts for high-performance ZABs and other energy-conversion devices.

关键词： Plasma-bombing Zinc-air batteries Durability Theoretical calculations Single-atom catalysts

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

miRNA在肺动脉高压发病机制中的研究进展

引用

中国比较医学杂志 2024年第6期34卷 172-178页

作者：李妍锦肖丽莹吴道雄管蓉闫春朗雷雯昆明医科大学第二附属医院呼吸与危重症医学科昆明650106 昆明医科大学第二附属医院检验医学科昆明650106

肺动脉高压(pulmonary hypertension, PH)是一种以肺血管重塑为特征的进展性疾病。目前对PH的治疗效果仍不理想,迫切需要更好地解读潜在的病理机制以便寻找新的治疗靶点。miRNA(microRNA)是转录后机制中的关键元件,主要通过调节下游靶... 详细信息

肺动脉高压(pulmonary hypertension, PH)是一种以肺血管重塑为特征的进展性疾病。目前对PH的治疗效果仍不理想,迫切需要更好地解读潜在的病理机制以便寻找新的治疗靶点。miRNA(microRNA)是转录后机制中的关键元件,主要通过调节下游靶基因的表达来介导细胞功能。大量的体内和体外研究表明miRNA及其调节因子参与PH发生发展。然而,关于miRNA调控肺血管重塑的机制尚没有统一定论。因此,本文就近年来miRNA在PH中的作用机制进行综述。

关键词： miRNA 肺动脉高压发病机制

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

抗高温抗盐水基降滤失剂的合成与性能评价

引用

广东化工 2024年第5期51卷 9-13页

作者：李保陆白杨王瑞芳陈新李道雄吴凌风王海波油气藏地质及开发工程国家重点实验室-西南石油大学四川成都610500 西南石油大学新能源与材料学院四川成都610500 西南石油大学石油与天然气工程学院四川成都610500

针对现有水基钻井液用降滤失剂抗高温和抗盐能力不足的问题,提出以腐植酸钠(Na Hm)、N,N-二甲基丙烯酰胺(NNDMA)、二甲基二烯丙基氯化铵(DMAAC)、对苯乙烯磺酸钠(SSS)为单体,过硫酸铵为引发剂,通过水溶液自由基聚合制备了一种抗高温抗... 详细信息

针对现有水基钻井液用降滤失剂抗高温和抗盐能力不足的问题,提出以腐植酸钠(Na Hm)、N,N-二甲基丙烯酰胺(NNDMA)、二甲基二烯丙基氯化铵(DMAAC)、对苯乙烯磺酸钠(SSS)为单体,过硫酸铵为引发剂,通过水溶液自由基聚合制备了一种抗高温抗盐降滤失剂。采用正交实验确定最佳反应条件:m(Na Hm∶NNDMA∶DMDAAC∶SSS)=2∶6∶2∶2,单体浓度30%,引发剂加量1.0%,反应温度65℃。利用红外光谱、热失重、核磁共振氢谱及环境扫描电镜对产物进行了结构表征和分析,证明四元聚合物制备成功,并通过抗高温、抗盐性能评价以及和市面常用产品对比,实验发现所合成的降滤失剂具有良好的抗高温抗盐性能,230℃老化16 h后,中压滤失量为5 m L,高温高压滤失量为22 m L,抗Na Cl 25%,抗Ca Cl21.5%,在高温高盐水基钻井液中具有广阔的应用前景。

关键词：水基钻井液降滤失剂抗高温抗盐聚合物

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

“单颗”微量物质的X射线相分析

引用

金属学报 1979年第2期15卷 274-282页

作者：吴奇星覃道湘大冶钢厂钢铁研究所

采用“单颗”回摆法,在普通的德拜相机中,对重量只有0.003μg的超微量物质进行X射线相分析。对方法的原理、衍射角的测量及计算、衍射斑点的数目、各个斑点的相对强度与ASTM卡片上同一物质各线条的相对强度间的关系等问题,进行了详细的... 详细信息

采用“单颗”回摆法,在普通的德拜相机中,对重量只有0.003μg的超微量物质进行X射线相分析。对方法的原理、衍射角的测量及计算、衍射斑点的数目、各个斑点的相对强度与ASTM卡片上同一物质各线条的相对强度间的关系等问题,进行了详细的分析和讨论。举例说阴这种方法在鉴定稀土夹杂物上的应用,并验证所推导的公式的正确性。

关键词：晶面族相分析晶体取向衍射斑衍射线微量物质衍射环回摆法稀土夹杂物相对强度单晶体

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

南亚热带混交人工林树种丰富度与土壤微生物多样性和群落组成的关系

引用

生态学报 2020年第22期40卷 8265-8273页

作者：宋战超王晖刘世荣胡佳佳明安刚陈海李朝英伍俊廷史作民卢立华蔡道雄中国林业科学研究院森林生态环境与保护研究所国家林业和草原局森林生态环境重点实验室北京100091 中国林业科学研究院热带林业实验中心广西友谊关森林生态系统国家定位观测研究站凭祥532600

森林植被与土壤微生物作为森林生态系统的重要组成部分,它们之间的相互作用对维持森林生态系统功能和稳定性起着重要作用。以往多在天然草地和森林生态系统开展植物多样性与土壤微生物多样性关系的研究,但人工构建的多树种混交林生态系... 详细信息

森林植被与土壤微生物作为森林生态系统的重要组成部分,它们之间的相互作用对维持森林生态系统功能和稳定性起着重要作用。以往多在天然草地和森林生态系统开展植物多样性与土壤微生物多样性关系的研究,但人工构建的多树种混交林生态系统中树种多样性对土壤微生物群落组成的影响及其机制尚不完全清楚。因此,以南亚热带人工块状造林后自然恢复形成的多树种混交森林生态系统为研究对象,利用高通量测序技术研究了随树种丰富度(1—10种)变化土壤细菌和真菌多样性的变化规律及主要影响因子。结果表明,随树种丰富度增加,土壤真菌α多样性显著提高,但土壤细菌α多样性差异不显著;不同树种丰富度梯度间土壤细菌和真菌的群落结构组成均差异显著;Pearson相关分析表明土壤细菌α多样性主要受土壤pH和土壤铵态氮影响,而土壤pH和有效磷是土壤真菌α多样性的主要影响因子。距离冗余分析(db-RDA)表明,对土壤细菌群落组成产生显著影响的环境因子分别为土壤pH、硝态氮和芳香碳组分,而土壤有机碳、硝态氮、细根生物量和氧烷基碳组分是影响土壤真菌群落组成的主要因子。本研究的结果说明了南亚热带人工林不同树种混交后形成多树种混交林生态系统的过程中,树种组成和多样性的变化通过改变土壤理化性状和根系生物量对土壤微生物群落组成有显著影响,为制定该区域人工林通过树种丰富度合理组配调控提升地下生物多样性及生态系统功能的经营策略提供了科学依据。

关键词：南亚热带混交人工林土壤微生物树种丰富度近自然恢复

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：