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Heterostructured Pd/PdO nanowires for selective and efficient CO_(2) electroreduction to CO

Journal of Energy Chemistry 2022年第7期31卷 407-413,I0011页

作者： Tian-Jiao Wang Wen-Sheng Fang Yi-ming liu fu-min li Pei Chen Yu Chen Key Laboratory of Macromolecular Science of Shaanxi Province Key Laboratory of Applied Surface and Colloid Chemistry(Ministry of Education)Shaanxi Key Laboratory for Advanced Energy DevicesSchool of Materials Science and EngineeringShaanxi Normal UniversityXi’an 710062ShaanxiChina School of Chemistry and Chemical Engineering Huazhong University of Science and TechnologyWuhan 430074HubeiChina

Palladium(Pd) nanostructures are highly promising electrocatalysts for the carbon dioxide electrochemical reduction(CO_(2) ER). At present, it is still challenge for the synthesis of Pd nanostructures with high activity, selectivity and stability. In this work, a facile PdII-complex pyrolysis method is applied to synthesize the high-quality one-dimensional heterostructured Pd/Pd O nanowires(Pd/Pd O H-NWs).The as-prepared Pd/Pd O H-NWs have a large electrochemically active surface area, abundant defects and Pd/Pd O heterostructure. Electrochemical measurement results reveal that Pd/Pd O H-NWs exhibit up to 94% CO Faraday efficiency with a current density of 11.6 m A cm^(-2) at an applied potential of -0.8 V. Meanwhile, Pd/Pd O H-NWs can achieve a stable catalytic process of 12 h for CO_(2) ER. Such outstanding CO_(2) ER performance of Pd/Pd O H-NWs has also been verified in the flow cell test. The density functional theory calculations indicate that Pd/Pd O heterostructure can significantly weaken the CO adsorption on Pd sites, which improves the CO tolerance and consequently enhances the catalytic performance of Pd/Pd O H-NWs for CO_(2) ER. This work highlights a facile complex pyrolysis strategy for the synthesis of Pd-based CO_(2) ER catalysts and provides a new application instance of metal/metal oxide heterostructure in electrocatalysis.

关键词： Pd/PdO nanowires Heterostructure Carbon dioxide electrochemical reduction Carbon monoxide Faraday efficiency

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Pt-Te alloy nanowires towards formic acid electrooxidation reaction

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Journal of Energy Chemistry 2023年第10期85卷 481-489,I0013页

作者： Bin Sun Yu-Chuan Jiang Qing-ling Hong Xue liu fu-min li Dong-Sheng li Yun Yang Yu Chen Key Laboratory of Macromolecular Science of Shaanxi Province School of Materials Science and EngineeringShaanxi Normal UniversityXi’an 710062ShaanxiChina Nanomaterials and Chemistry Key Laboratory Wenzhou UniversityWenzhou 325035ZhejiangChina School of Chemistry and Chemical Engineering Huazhong University of Science and TechnologyWuhan 430074HubeiChina College of Materials and Chemical Engineering Key Laboratory of Inorganic Nonmetallic Crystalline and Energy Conversion MaterialsChina Three Gorges UniversityYichang 443002HubeiChina

The high-performance anodic electrocatalysts is pivotal for realizing the commercial application of the direct formic acid fuel *** this work,a simple polyethyleneimine-assisted galvanic replacement reaction is applied to synthesize the high-quality PtTe alloy nanowires(PtTe NW)by using Te NW as an efficient sacrificial *** existence of Te atoms separates the continuous Pt atoms,triggering a direct reaction pathway of formic acid electrooxidation reaction(FAEOR)at PtTe *** one-dimensional architecture and highly active sites have enabled PtTe NW to reveal outstanding electrocatalytic activity towards FAEOR with the mass/specific activities of 1091.25 mA mg^(-1)/45.34 A m^(-2)at 0.643 V potential,which are 44.72/23.16 and 20.26/11.75 times bigger than those of the commercial Pt and Pd nanoparticles,*** functional theory calculations reveal that Te atoms optimize the electronic structure of Pt atoms,which decreases the adsorption capacity of CO intermediate and simultaneously improves the durability of PtTe NW towards *** work provides the valuable insights into the synthesis and design of efficient Pt-based alloy FAEOR electrocatalysts.

关键词： Formic acid electrooxidation PtTe alloy nanowires Galvanic replacement reaction Reaction pathway fuel cells

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Hydrogen generation from ammonia electrolysis on bifunctional platinum nanocubes electrocatalysts

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Journal of Energy Chemistry 2020年第8期29卷 234-240,I0009页

作者： Hui-Ying Sun Guang-Rui Xu fu-min li Qi ng-li ng Hong Pu-Jun Jin Pei Chen Yu Chen Key Laboratory of Macromolecular Science of Shaanxi Province Key Laboratory of Applied Surface and Colloid Chemistry(Ministry of Education)Shaanxi Key Laboratory for Advanced Energy DevicesSchool of Materials Science and EngineeringShaanxi Normal UniversityXi'an 710062ShaanxiChina School of Chemistry and Chemical Engineering Shaanxi Normal UniversityXi'an 710062ShaanxiChina

The ammonia electrolysis is a highly efficient and energy-saving method for ultra-pure hydrogen generation, which highly relies on electrocatalytic performance of electrocatalysts. In this work, high-quality platinum(Pt) nanocubes(Pt-NCs) with 4.5 nm size are achieved by facile hydrothermal synthesis. The physical morphology and structure of Pt-NCs are exhaustively characterized, revealing that Pt-NCs with special {100} facets have excellent uniformity, good dispersity and high crystallinity. Meanwhile, the electrocatalytic performance of Pt-NCs for ammonia electrolysis are carefully investigated in alkaline solutions, which display outstanding electroactivity and stability for both ammonia electrooxidation reaction(AEOR) and hydrogen evolution reaction(HER) in KOH solution. furthermore, a symmetric Pt-NCs||Pt-NCs ammonia electrolyzer based on bifunctional Pt-NCs electrocatalyst is constructed, which only requires 0.68 V electrolysis voltage for hydrogen generation. Additionally, the symmetric Pt-NCs||Pt-NCs ammonia electrolyzer has excellent reversible switch capability for AEOR at anode and HER at cathode, showing outstanding alternating operation ability for ammonia electrolysis.

关键词： Ammonia electrolysis Water electrolysis Ammonia oxidation reaction Hydrogen evolution reaction Platinum nanocubes

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Au core-PtAu alloy shell nanowires for formic acid electrolysis

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Journal of Energy Chemistry 2022年第2期31卷 94-102页

作者： Qi Xue Xin-Yu Bai Yue Zhao Ya-Nan li Tian-Jiao Wang Hui-Ying Sun fu-min li Pei Chen Pujun Jin Shi-Bin Yin 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 DevicesShaanxi Engineering Lab for Advanced Energy TechnologySchool of Materials Science and EngineeringShaanxi Normal UniversityXi’an 710062ShaanxiChina MOE Key Laboratory of New Processing Technology for Non-ferrous Metals and Materials Guangxi Key Laboratory of Processing for Non-ferrous Metals and Featured MaterialsGuangxi UniversityNanning 530004GuangxiChina

Inefficient electrocatalysts and high-power consumption are two thorny problems for electrochemical hydrogen(H2)production from acidic water *** we report the one-pot precise synthesis of ultrafine Au core-Pt Au alloy shell nanowires(Au@PtxAu UFNWs).Among them,Au@Pt_(0.077) Au UFNWs exhibit the best performance for formic acid oxidation reaction(FAOR)and hydrogen evolution reaction(HER),which only require applied potentials of 0.29 V and-22.6 m V to achieve a current density of 10 m A cm^(-2),*** corresponding formic acid electrolyzer realizes the electrochemical H2 production at a voltage of only 0.51 V with 10 m A cm^(-2) current *** functional theory(DFT)calculations reveal that the Au-riched Pt Au alloy structure can facilitates the direct oxidation pathway of FAOR and consequently elevates the FAOR activity of Au@Pt_(0.077) Au *** work provides meaningful insights into the electrochemical H_(2) production from both the construction of advanced bifunctional electrocatalysts and the replacement of OER.

关键词： Au core-PtAu alloy shell nanowires Formic acid oxidation reaction Reaction pathway Hydrogen evolution reaction Acidic water electrolysis

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Porous palladium phosphide nanotubes for formic acid electrooxidation

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Carbon Energy 2022年第3期4卷 283-293页

作者： Tian-Jiao Wang Yu-Chuan Jiang Jia-Wei He fu-min li Yu Ding Pei Chen Yu Chen School of Materials Science and Engineering Key Laboratory of Macromolecular Science of Shaanxi ProvinceKey Laboratory of Applied Surface and Colloid Chemistry(Ministry of Education)Shaanxi Key Laboratory for Advanced Energy DevicesShaanxi Engineering Lab for Advanced Energy TechnologyShaanxi Normal UniversityXi'anChina

The development of an efficient catalyst for formic acid electrocatalytic oxidation reaction(FAEOR)is of great significance to accelerate the commercial application of direct formic acid fuel cells(DFAFC).Herein,palladium phosphide(PdxPy)porous nanotubes(PNTs)with different phosphide content(i.e.,Pd3P and Pd5P2)are prepared by combining the self-template reduction method of dimethylglyoxime-Pd(II)complex nanorods and succedent phosphating *** the reduction process,the self-removal of the template and the continual inside-outside Ostwald ripening phenomenon are responsible for the generation of the one-dimensional hollow and porous *** the basis of the unique synthetic procedure and structural advantages,Pd3P PNTs with optimized phos phide content show outstanding electroactivity and stability for *** portantly,the strong electronic effect between Pd and P promotes the direct pathway of FAEOR and inhibits the occurrence of the formic acid decomposition reaction,which effectively enhances the FAEOR electroactivity of Pd3P *** view of the facial synthesis,excellent electroactivity,high stability,and unordinary selectivity,Pd3P PNTs have the potential to be an efficient anode electrocatalyst for DFAFC.

关键词： electronic effect formic acid oxidation reaction palladium phosphide porous nanotubes self-template method

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Defect-rich bismuth metallene for efficient CO_(2) electroconversion

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Chinese Journal of Structural Chemistry 2023年第8期42卷 11-16页

作者： Bo-Qiang Miao Wen-Sheng Fang Bin Sun fu-min li Xiao-Chen Wang Bao-Yu Xia Yu Chen Key Laboratory of Macromolecular Science of Shaanxi Province Shaanxi Key Laboratory for Advanced Energy DevicesSchool of Materials Science and EngineeringShaanxi Normal UniversityXi'an710062PR China School of Chemistry and Chemical Engineering Key Laboratory of Material Chemistry for Energy Conversion and Storage(Ministry of Education)Hubei Key Laboratory of Material Chemistry and Service FailureHubei Engineering Research Center for Biomaterials and Medical Protective MaterialsWuhan National Laboratory for OptoelectronicsHuazhong University of Science and Technology(HUST)1037 Luoyu RdWuhan430074PR China

*** Carbon dioxide reduction(CO_(2)RR)technology has attracted much attention in recent years and can effectively decrease the greenhouse effect and simultaneously achieve chemical energy storage[1].In the electrochemical process,a large overpotential is generally required to activate inert CO_(2)molecules,resulting in the inevitable competition reaction from the hydrogen evolution reaction(HER)and consequently decreasing the faradaic efficiency of CO_(2)RR[2,3].Among various reduction products of CO_(2)RR,formate is the most prevalent product with important applications in the energy conversion and chemical *** a host of catalysts that can convert CO_(2)to formate,bismuth(Bi)-based nanomaterials are highly promising electrocatalysts for the conversion of CO_(2)to formate due to their high faradaic efficiency and good ***,the preparation method and catalytic activity of Bi-based nanomaterials still need to be further improved for industrial conversion of the CO_(2)RR.

关键词： stability. bismuth dioxide

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Insight into the oxidative desulfurization of high-sulfur petroleum coke under mild conditions:a journey of vanadium-substituted Dawson-type phosphotungstic acid

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Petroleum Science 2021年第3期18卷 983-993页

作者： fu-min li ming-Qing Hua Yan-Chen Wei Ji-Xing liu Jia-Hong Gong Chao Wang Pei-Wen Wu Yan Huang Hua-ming li Wen-Shuai Zhu School of Chemistry and Chemical Engineering Jiangsu UniversityZhenjiang 212013China School of Materials Science and Engineering Jiangsu UniversityZhenjiang 212013China School of the Environment and Safety Engineering Jiangsu UniversityZhenjiang 212013China

High-sulfur petroleum coke(HSPC),that is a by-product from slag oil in the coking process of refning,shows versatility values in practical applications and,however,concentrates the majority of organic ***,we design and construct a highly efective CTAB@HPA composites to be explored for the catalytic oxidative desulfurization of HSPC under mild conditions using hydrogen peroxide as the oxidant and 1-butyl-3-methylimidazole tetrafuoroborate ionic liquid as the *** results demonstrate that the sulfur content of HSPC could be strikingly reduced from 4.46 wt%to 2.48 wt%under 60℃ and atmospheric pressure,and that the organic sulfur in HSPC is mainly oxidized to sulfoxide,sulfone and sulfate,which latter can be directly separated from petroleum ***,the efect of reaction conditions on the desulfurization performance of HSPC as well as the catalytic oxidation reaction kinetic of HSPC desulfurization was systematically ***,a mechanism for the oxidative desulfurization of HSPC over CTAB@HPA catalysts was ***,this work provides new insight into how to construct active catalysts for the desulfurization of HSPC under mild conditions.

关键词： High-sulfur petroleum coke Dawson-type phosphotungstic acid Oxidative desulfurization Mild conditions Sulfate

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轿车并列行驶湍流特性的数值模拟

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吉林大学学报（工学版） 2005年第4期35卷 358-362页

作者：傅立敏扶原放吉林大学汽车工程学院长春130022

为了研究复数车辆并列行驶的湍流特性对交通安全的影响,采用移动地面模拟轿车相对地面的运动和旋转壁面模拟车轮转动的方法,进行了两辆轿车并列行驶外部流场湍流特性的数值模拟研究。以单倍车宽侧向间距的两辆轿车为典型算例,给出了汽... 详细信息

为了研究复数车辆并列行驶的湍流特性对交通安全的影响,采用移动地面模拟轿车相对地面的运动和旋转壁面模拟车轮转动的方法,进行了两辆轿车并列行驶外部流场湍流特性的数值模拟研究。以单倍车宽侧向间距的两辆轿车为典型算例,给出了汽车车身表面的速度和压力分布,并讨论了右侧轿车尾部流场3个典型截面的速度分布和尾部流线分布情况。重点对比了0.1、0.3、0.5、1、2倍车宽间距的两车流场的流线分布情况。右侧轿车侧向力系数的对比分析说明:随着两车侧向间距的减小,迅速增大的侧向力将两车压向彼此。为保证行驶安全性和操纵稳定性,两车并列行驶的安全距离应该在单倍车宽与0.5倍车宽之间。

关键词：汽车空气动力学数值模拟并列行驶湍流特性气动力

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侧风对轿车气动特性影响的数值模拟研究

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哈尔滨工业大学学报 2006年第8期38卷 1255-1258页

作者：王夫亮傅立敏吉林大学汽车工程学院长春130022

选用某国产轿车1∶1模型,利用混合网格方案对不同强度侧风作用下的轿车外流场进行数值模拟,得到不同侧风强度下的流场速度压力分布及气动力系数变化情况.分析不同强度的侧风作用下的流场速度和压力分布,着重分析了尾部流场的变化,定性... 详细信息

选用某国产轿车1∶1模型,利用混合网格方案对不同强度侧风作用下的轿车外流场进行数值模拟,得到不同侧风强度下的流场速度压力分布及气动力系数变化情况.分析不同强度的侧风作用下的流场速度和压力分布,着重分析了尾部流场的变化,定性地解释了侧风对轿车气动力特性的影响,初步研究了尾流随侧风作用的变化机理.模拟结果表明,该车型在不同强度侧风作用下,侧向力系数和升力系数均随着侧风作用的增强而增大.研究结论为深入分析侧风作用下轿车外流场特性提供了有利的参考.

关键词：汽车空气动力学侧风数值模拟侧风稳定性

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A Hierarchical Virus Immunization Method for Community Networks

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China Communications 2014年第9期11卷 148-159页

作者： fu Cai li min ZHANG Yunhe ZOU Deqing HAN Lansheng School of Computer Huazhong University of Science and Technology Wuhan 430074 China

Due to the enormous harm of virus propagation,research regarding virus immunizations still absolutely *** comparison to current researches,a new virus immunization method the hierarchical virus immunization method(HVIM) for community networks is *** on the virus transmission dynamic model SusceptibleInfectious-Removed and SusceptibleRemoved(SIRSR),HVIM considered the influence of external factors on the spread of viruses and only needs a portion of the network structure to be able to carry out *** pro for HVIM is that it is scalable and suitable for parallel computing which is a requirement in the big data ***,a simulation dataset and a real dataset were used to run experiments,and the results of simulation showed that HVIM obviously is superior to others on the aspect of immunity.

关键词： Community Networks VirusPropagation SIRSR Model HierarchicalVirus Immunization Method (HVIM)

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