检索结果-南通市图书馆

Achieving highly selective electrochemical CO_(2) reduction to C_(2)H_(4) on Cu nanosheets

Journal of Energy Chemistry 2023年第4期79卷 312-320页

作者： Huan xie ruikuan xie Zhiyuan Zhang Yongyu Pang Yuting Luo Jiong Li Bilu Liu Maria-Magdalena Titirici Guoliang Chai State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou 350002FujianChina Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources International Innovation Center for Forest Chemicals and MaterialsCollege of Materials Science and EngineeringNanjing Forestry UniversityNanjing 210037JiangsuChina Shenzhen Geim Graphene Center(SGC) Tsinghua-Berkeley Shenzhen Institute(TBSI)and Tsinghua Shenzhen International Graduate School(TSIGS)Tsinghua UniversityShenzhen 518055GuangdongChina School of Chemical Science University of Chinese Academy of SciencesBeijing 100049China Shanghai Synchrotron Radiation Facility Shanghai Advanced Research Institute Chinese Academy of SciencesShanghai 201210China Department of Chemical Engineering Imperial College LondonSW72AZUK

The conversion of CO_(2)into value-added chemicals coupled with the storage of intermittent renewable electricity is *** nanosheets with an average size and thickness of~30 and~20 nm have been developed,which are in situ reduced into Cu nanosheets during electrochemical CO_(2)reduction reaction(ECO_(2)RR).The derived Cu nanosheets demonstrate much higher selectivity for C2H4production than commercial CuO derived Cu powder,with an optimum Faradaic efficiency of 56.2%and a partial current density of C_(2)H_(4)as large as 171.0 mA cm^(-2)in a gas diffusion flow *** operando attenuated total reflectance-Fourier transform infrared spectra measurements and density functional theory simulations illustrate that the high activity and selectivity of Cu nanosheets originate from the edge sites on Cu nanosheets with a coordinate number around 5(4–6),which facilitates the formation of^(*)CHO rather than^(*)COH intermediate,meanwhile boosting the C-C coupling reaction of^(*)CO and^(*)CHO intermediates,which are the critical steps for C_(2)H_(4)formation.

关键词： Electrochemical CO_(2)reduction Cu nanosheets C_(2)H_(4) High selectivity Coordination number

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

Modified Cu active sites by alloying for efficient electrocatalytic reduction CO_(2) to CO

引用

Journal of Energy Chemistry 2024年第12期99卷 450-457页

作者： Yan Wang ruikuan xie Naixuan Ci Zhiyuan Zhu Chaoyi Li Guoliang Chai Hua-Jun Qiu Yinghe Zhang Shenzhen Key Laboratory of Advanced Functional Carbon Materials Research and Comprehensive Application Harbin Institute of TechnologyShenzhen 518055GuangdongChina School of Science Harbin Institute of TechnologyShenzhen 518055GuangdongChina School of Materials Science and Engineering Harbin Institute of TechnologyShenzhen 518055GuangdongChina State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou 350002FujianChina

Transition metals like Au,Ag,and Cu have been reported to be quite active for CO_(2) *** this study,we use density functional theory(DFT)calculation to investigate the electronic structure and catalytic performance of Au,Ag,Cu and their alloys for CO_(2) reduction reaction(CO_(2)RR).Theoretical calculations identified the combination of Ag,Cu,and Au in a face-centered cubic(fcc)alloy as an outstanding electrocatalyst for CO_(2) reduction to CO,with Cu as the active *** d-orbital projected density of state(PDOS)profile suggests that alloying alters the electronic structure of the Cu site,thereby affecting the Gibbs free energy change for the formation of*COOH intermediate(ΔG_(*COOH)).To demonstrate the theoretical prediction experimentally,we employ a top-down dealloying approach to synthesize a nanoporous structured AgCuAu alloy(NP-Ag_(5)Cu_(5)Au_(5)).Electrochemical experiments validate that the ternary alloy catalyst is clearly better than unary and binary catalysts,showing a Faradaic efficiency(FE)for CO over 90%across a broad potential range of 0.6 V,with a peak of approximately 96%at-0.573 V *** study underscores the potential of multi-component alloys in CO_(2)RR and establishes a theoretical basis for designing efficient catalysts for CO_(2) utilization.

关键词： CO_(2)reduction CO Multi-component alloy Nano-porous Electrocatalyst

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

Unraveling the role of Ti3C2 MXene underlayer for enhanced photoelectrochemical water oxidation of hematite photoanodes

引用

Journal of Energy Chemistry 2021年第7期30卷 147-154,I0005页

作者： Haiyan Ji Shan Shao Guotao Yuan Cheng Lu Kun Feng Yujian Xia Xiaoxin Lv Jun Zhong Hui Xu Jiujun Deng School of Materials Science and Engineering Jiangsu UniversityZhenjiang 212013JiangsuChina Institute for Energy Research Jiangsu UniversityZhenjiang 212013JiangsuChina Institute of Functional Nano and Soft Materials Laboratory(FUNSOM) Jiangsu Key Laboratory for Carbon-Based Functional Materials&DevicesSoochow UniversitySuzhou 215123JiangsuChina Automotive Engineering Research Institute Jiangsu UniversityZhenjiang 212013JiangsuChina

Hematite is regarded as a promising photoanode for photoelectrochemical(PEC) water ***,the charge recombination occurred at the interface of FTO/hematite strictly limits the PEC performance of ***,we reported a Ti3C2 MXene underlayer modified hematite(Ti-Fe2O3) photoanode via a simple drop-casting followed by hydrothermal and annealing *** to the bifunctional role of Ti3C2 MXene underlayer in improving the interfacial properties of FTO/hematite and providing Ti source for the construction of Fe2 TiO5/Fe2O3 heterostructure in hematite nanostructure,the bulk and interfacial charge transfer dynamics of hematite are significantly enhanced,and consequently enhancing the PEC *** with the pristine hematite,the as-prepared Ti-Fe2O3 photoanode shows an increased photocurrent density from 0.80 mA/cm^(2) to 1.30 mA/cm^(2) at 1.23 V ***,a further promoted PEC performance including a dramatically increased photocurrent density of 2.49 mA/cm^(2) at1.23 V *** and an obviously lowered onset potential is achieved for the Ti-Fe2O3 sample after the subsequent surface F-treatment and the loading of FeNiOOH *** results suggest that the introduction of Ti3C2 MXene underlayer is a facile but effective approach to improve the PEC water splitting activity of hematite.

关键词： Hematite Photoelectrochemical Water splitting Ti3C2 MXene Underlayer

来源：

维普期刊数据库

同方期刊数据库

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

多路供电系统高压输电线考虑弧垂的场强计算模型

引用

现代电力 2005年第6期22卷 18-21页

作者：宗伟孙才华隋吉生谢瑞宽华北电力大学北京102206 吉林供电公司吉林省吉林市132001

交流输电线路附近的空间场强是随时间变化的,在电磁环境保护和ADSS光缆架设中都需要计算出空间点在一个时间周期内的最大场强值,而对于实际输电线路还要充分考虑弧垂的影响。针对上述情况,采用等效电荷法,在考虑弧垂时分别基于频域和时... 详细信息

交流输电线路附近的空间场强是随时间变化的,在电磁环境保护和ADSS光缆架设中都需要计算出空间点在一个时间周期内的最大场强值,而对于实际输电线路还要充分考虑弧垂的影响。针对上述情况,采用等效电荷法,在考虑弧垂时分别基于频域和时域建立了多路供电系统高压输电线下的分段三维计算模型,并推导出了相应的最大场强计算公式。比较两种模型发现时域模型占用内存较少且延拓性较强,建议采用时域模型。最后用其公式编程对一条输电线路进行了计算比较,得出所推导的最大场强公式计算结果比以往场强计算结果更准确,弧垂对输电线路的最大场强有很大的影响,输电线路的场强计算应该采用三维模型。

关键词：输电线路多路供电系统等效电荷法电场强度弧垂全介质自承式光缆

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

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

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：