检索结果-南通市图书馆

Facile self-template fabrication of hierarchical nickel-cobalt phosphide hollow nanoflowers with enhanced hydrogen generation performance

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

Science Bulletin 2019年第22期64卷 1675-1684页

作者： Xupo Liu shaofeng deng Peifang Liu Jianing Liang Mingxing Gong Chenglong Lai Yun Lu Tonghui Zhao Deli Wang Key Laboratory of Material Chemistry for Energy Conversion and Storage Ministry of EducationHubei Key Laboratory of Material Chemistry and Service FailureSchool of Chemistry and Chemical EngineeringHuazhong University of Science and TechnologyWuhan 430074China Analysis&Testing Center of Xin yang Normal University Xin yang 464000.China

Developing facile methods to construct hierarchical-structured transition metal phosphides is beneficial for achieving high-efficiency hydrogen evolution catalysts.Herein,a self-template strategy of hydrothermal treatment of solid Ni-Co glycerate nanospheres followed by phosphorization is delivered to synthesize hierarchical Ni Co P hollow nanoflowers with ultrathin nanosheet assembly.The microstructure of Ni Co P can be availably tailored by adjusting the hydrothermal treatment temperature through affecting the hydrolysis process of Ni-Co glycerate nanospheres and the occurred Kirkendall effect.Benefitting from the promoted exposure of active sites and affluent mass diffusion routes,the HER performance of the Ni Co P hollow nanoflowers has been obviously enhanced in contrast with the solid Ni Co P nanospheres.The fabricated Ni Co P hollow nanoflowers yield the current density of 10 m A cmà2at small overpotentials of 95 and 127 m V in 0.5 mol Là1H2SO4and 1.0 mol Là1KOH solution,respectively.Moreover,the two-electrode alkaline cell assembled with the Ni Co P and Ir/C catalysts exhibits sustainable stability for overall water splitting.The work provides a simple but efficient method to regulate the microstructure of transition metal phosphides,which is helpful for achieving high-performance hydrogen evolution catalysts based on solid-state metal alkoxides.

关键词： Self-template method Hydrolysis of glycerate nanospheres Kirkendall effect NiCoP hollow nanoflowers Hydrogen evolution reaction

Molybdenum-doped titanium dioxide supported low-Pt electrocatalyst for highly efficient and stable hydrogen evolution reaction

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2021年第2期32卷 765-769页

作者： Ke Chen shaofeng deng Yun Lu Mingxing Gong Yezhou Hu Tonghui Zhao Tao Shen Deli Wang Key Laboratory of Material Chemistry for Energy Conversion and Storage(Huazhong University of Science and Technology) Ministry of EducationHubei Key Laboratory of Material Chemistry and Service FailureSchool of Chemistry and Chemical EngineeringHuazhong University of Science and TechnologyWuhan 430074Chin

The Platinum(Pt)-based catalysts exhibit excellent catalytic performance for the hydrogen evolution reaction(HER) while suffering from poor stability due to the weak interaction between the carbon support and Pt.Herein,a molybdenum-doped titanium dioxide(Ti_(0.9)Mo_(0.1)O_(2)) supported low-Pt electrocatalyst with stronger interaction between catalyst and support is applied to tune the electrocatalytic performance of Pt.The Ti_(0.9)Mo_(0.1)O_(2) support can not only tolerate the corrosion environment in the catalytic system,but also generate strong metal-support inte raction(SMSI) between the oxide and catalyst.A facile solvothermal method is used to prepareTi_(0.9)Mo_(0.1)O_(2) as support to anchor Pt nanoparticles.The 5% Pt supported on Ti_(0.9)Mo_(0.1)O_(2) catalyst exhibits 4.4-fold mass activity(MA) at an overpotential of 50 mV and higher stability than 20% Pt/C with only 1/4 Pt loading.The SMSI between the Ti_(0.9)Mo_(0.1)O_(2) and Pt prevents the Pt aggregation to achieve excellent stability,and hydrogen spillover effect in the interface between Pt and support benefits the hydrogen production process.This work presents a novel sight for the fabrication and design of oxide supported catalysts in various catalytic system by reasonably employing support effect.

关键词： Low-Pt electrocatalyst Oxide support Strong metal-support interaction Hydrogen spillover effect Hydrogen evolution reaction

Boosting alkaline hydrogen electrooxidation on an unconventional fcc-Ru polycrystal

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2021年第10期30卷 15-22,I0002页

作者： Tonghui Zhao Dongdong Xiao Yi Chen Xi Tang Mingxing Gong shaofeng deng Xupo Liu Jianmin Ma Xu Zhao Deli Wang Key Laboratory of Material Chemistry for Energy Conversion and Storage(Huazhong University of Science and Technology) Ministry of EducationHubei Key Laboratory of Material Chemistry and Service FailureSchool of Chemistry and Chemical EngineeringHuazhong University of Science and TechnologyWuhan 430074HubeiChina Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China School of Physics and Electronics Hunan UniversityChangsha 410082HunanChina Key Laboratory of Materials Processing and Mold(Zhengzhou University) Ministry of EducationZhengzhou UniversityZhengzhou 450002HenanChina

Precisely controlling the crystalline phase structure and exposed facets at the atomic level opens up a new avenue for efficient catalyst design.Along this line,we report an unconventional face-centered cubic(fcc)Ru with twinned structure and stacking-fault defects as a competent electrocatalyst towards alkaline hydrogen oxidation reaction(HOR),which is now a major obstacle for the commercialization of anion exchange membrane fuel cells(AEMFC).With conventional hexagonal close packing(hcp)Ru as the counterpart,a novel scope from the phase-engineering is introduced to identify the activity origin and provide fundamental understanding of the sluggish HOR kinetics in alkaline medium.Systematic electrochemical analysis assisted by deconvoluting the hydrogen(H)desorption peaks indicates the superior performance of fcc Ru origins from the structure defects and higher proportion of the most active sites.DFT calculations,together with CO-stripping voltammograns further corroborate the stronger hydroxyl species(OH^(*))affinity lead to the higher activity on these sites.Meanwhile,it also demonstrates the H^(*)adsorption/desorption on polycrystalline Ru among the conventional"hydrogen region"is accompanied by the surface bound OH^(*)in alkaline medium,which is of great significance for subsequent alkaline HOR exploration and catalyst design.

关键词： Anion exchange membrane fuel cells Hydrogen oxidation reaction Phase-engineering Fcc Ru Surface bound OH^(*)

Insight into the hydrogen oxidation electrocatalytic performance enhancement on Ni via oxophilic regulation of MoO_(2)

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2021年第3期30卷 202-207页

作者： shaofeng deng Xupo Liu Xuyun Guo Tonghui Zhao Yun Lu Jingyu Cheng Ke Chen Tao Shen Ye Zhu Deli Wang Key Laboratory of Material Chemistry for Energy Conversion and Storage(Huazhong University of Science and Technology) Ministry of EducationHubei Key Laboratory of Material Chemistry and Service FailureSchool of Chemistry and Chemical EngineeringHuazhong University of Science and TechnologyWuhan 430074HubeiChina Department of Applied Physics The Hong Kong Polytechnic UniversityHung HornHong KongChina

Exploring platinum-group-metal(PGM)free electrocatalysts for hydrogen oxidation reaction(HOR)in alkaline media is essential to the progress of anion exchange membrane fuel cells(AEMFCs).In this work,a Ni/MoO_(2) heterostructure catalyst with comparable HOR activity in alkaline electrolyte with PGM catalyst was prepared by a simple hydrothermal-reduction method.Remarkably,the Ni/MoO_(2) presents a mass kinetic current density of 38.5 mA mgNi^(-1) at the overpotential of 50 mV,which is higher than that of the best PGM free HOR catalyst reported by far.Moreover,the HOR performance of Ni/MoO_(2) under 100 ppm CO shows negligible fading,together with the superior durability,render it significant potential for application in AEMFCs.A particular mechanistic study indicates that the excellent HOR performance is ascribed to the accelerated Volmer step by the incorporation of MoO_(2).The function of MoO_(2) was further confirmed by CO striping experiment on Pt/C-MoO_(2) that MoO_(2) can facilitated OH adsorption thus accelerate the HOR process.On account of the high performance and low cost,the Ni/MoO_(2) electrocatalyst encourages the establishment of high performance PGM free catalyst and shows significant potential for application in AEMFCs.

关键词： HOR Oxophilic CO tolerance MoO_(2)

Semi-interpenetrating polymer networks toward sulfonated poly(ether ether ketone) membranes for high concentration direct methanol fuel cell

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2019年第2期30卷 299-304页

作者： Xupo Liu Yunfeng Zhang shaofeng deng Cuicui Li Jiaming Dong Jiaying Wang Zehui Yang Deli Wang Hansong Cheng Sustainable Energy Laboratory Faculty of Materials Science and Chemistry China University of Geosciences (Wuhan) Key Laboratory of Material Chemistry for Energy Conversion and Storage (Huazhong University of Science and Technology) Ministry of Education Hubei Key Laboratory of Material Chemistry and Service Failure School of Chemistry and Chemical Engineering Huazhong University of Science and Technology

Low methanol permeability of proton exchange membranes (PEMs) is greatly important for direct methanol fuel cells (DMFCs). Here, sulfonated poly (ether ether ketone) (SPEEK) based semiinterpenetrating polymer networks (semi-IPNs) are successfully prepared by interpenetrating SPEEK into the in-situ synthesized crosslinking networks. The polymeric networks are formed by the covalent bonds between bromobenzyl groups of bro mo methylated poly (phenylene oxide) and amine groups of diamine linkers as well as the ionic bonds between amine species and sulfonated groups. Two linkers without and with sulfonated groups are applied to fabricate the semi-IPNs. The core properties of the membranes, like phase separation, water uptake, proton conductivity and methanol permeability, are systematically studied and compared. The DMFCs assembled by using the semi-IPN membranes display better performance than Nafion 117 in high concentration methanol solutions. The present work provides a facile way to prepare PEMs with enhanced DMFC performance.

关键词： Direct methanol fuel cell Proton exchange membrane Semi-interpenetrating polymer networks Sulfonated poly(ether ether ketone) Bromomethylated poly(phenylene oxide)

An Efficient Two-Party Key Exchange Protocol with Strong Security

在线全文

学校读者我要写书评

暂无评论

Wuhan University Journal of Natural Sciences 2010年第3期15卷 267-271页

作者： deng shaofeng LI Yifa deng Yiqun Institute of Information Engineering Information Engineering University Zhengzhou 450002 Henan China

Combined public key （CPK） cryptography does not need certificates to guarantee the authenticity of public keys and avoids the inherent key escrow problem of identity-based cryptography. Based on the efficient CPK scheme, we present an efficient three-round two-party authenticated key exchange protocol with strong security, which is provably secure in the standard model under the decisional Diffie-Hellman （DDH） assumption. The protocol can keep the session key secret from the adversary except that one party＇s ephemeral private key and static private key are all revealed to the adversary. Compared to the existing protocols, this protocol not only assures strong security but also is more efficient.

关键词： combined public key （CPK） authenticated key exchange protocol strong security standard model

在线全文

学校读者我要写书评

暂无评论

不同基质配比对草莓匍匐茎育苗的影响

果树资源学报 2024年第2期5卷 13-15页

作者：刘志泰池海青刘小花孔祥利许利平董淑君邓少丰李岩承德市农林科学院河北承德067000 承德同欲农业开发有限公司河北承德067000 承德市双滦区农业农村局河北承德067000

【目的】探索不同基质配比对草莓匍匐茎育苗的影响,以期为草莓匍匐茎育苗筛选适宜基质配比。【方法】以‘红颜’草莓为试材,以草炭、稻壳、水渣、醋糟、牛粪、马粪为基质材料,设置4个基质配比处理,草炭∶稻壳∶水渣为5∶1∶1、草炭∶醋... 详细信息

【目的】探索不同基质配比对草莓匍匐茎育苗的影响,以期为草莓匍匐茎育苗筛选适宜基质配比。【方法】以‘红颜’草莓为试材,以草炭、稻壳、水渣、醋糟、牛粪、马粪为基质材料,设置4个基质配比处理,草炭∶稻壳∶水渣为5∶1∶1、草炭∶醋糟∶水渣为5∶1∶1,牛粪∶醋糟∶水渣为5∶1∶1,马粪∶醋糟∶水渣为5∶1∶1,采用商品草莓育苗专用基质为对照,测定不同处理对草莓母株植物学特征、生物学特性的影响。【结果】不同处理的草莓苗成活率都能达到90%以上,采用商品育苗专用基质的草莓苗长势最强,芯茎、匍匐茎最粗,匍匐茎抽生数量最多,抽生时间最早,繁殖系数最高。【结论】在草莓基质育苗中使用商品草莓育苗专用基质对草莓育苗较适宜,可在草莓基质育苗中推广使用。

关键词：基质配比草莓匍匐茎育苗

Temperature-Regulated Morphology Evolution of NiCoP with Enhanced Hydrogen Evolution Reaction Performance

在线全文

学校读者我要写书评

暂无评论

Temperature-Regulated Morphology Evolution of NiCoP with Enh...

Microbes in mass extinction: an accomplice or a savior?

中国化学会2019能源材料和缺陷化学研讨会

作者： Xupo Liu shaofeng deng Mingxing Gong Tonghui Zhao Deli Wang School of Chemistry and Chemical Engineering Huazhong University of Science and Technology

＜正＞Constructing hierarchical structure with ordered nanosheet assembly is an efficient strategy to enhance the electrocatalytic property of transition metal phosphides. Herein, a self-template strategy of hydrothermal treatment of solid Ni-Co glycerate nanospheres followed by phosphorization to synthesize hierarchical NiCoP hollow nanospheres with self-assembly nanosheets（hollow nanoflowers） is reported. The morphology of NiCoP can be availably tailored by adjusting the hydrothermal treatment temperature of Ni-Co glycerate nanospheres（Fig. 1）.

关键词：

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

National Science Review 2024年第1期11卷 12-15页

作者： Genming Luo deng Liu Hao Yang China University of Geosciences (Wuhan) State Key Laboratory of Geobiology and Environmental Geology

Microbes include various types of organisms that are invisible to the naked eye,e.g. bacteria, archaea and microeukaryotes. Although the precise number remains largely unknown, microbes are recognized as the unseen majority of our biosphere [1]. As a group of organisms classified by body size, microbes cover a considerable spectrum of metabolisms,

关键词： AFTERMATH