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Carbon nanotubes-Nafion composites as Pt-Ru catalyst support for methanol electro-oxidation in acid media

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Journal of Natural Gas Chemistry 2009年第2期18卷 199-204页

作者： Shengzhou Chen Fei Ye Weiming Lin School of Chemistry and Chemical Engineering Guangzhou University Guangzhou 510006 Guangdong China School of Chemical and Energy Engineering South China University of Technology Guangzhou 510640 Guangdong China

Carbon nanotubes-Nafion （CNTs-Nation） composites were prepared by impregnated CNTs with Nation in ethanol solution and characterized by FT-IR. Pt-Ru catalysts supported on CNTs-Nafion composites were synthesized by microwave-assisted polyol process. The physical and electrochemical properties of the catalysts were characterized by X-ray diffraction （XRD）, transmission electron microscope （TEM）, CO stripping voltammetry, cyclic voltammetry （CV） and chronoamperometry （CA）. The results showed that the Nation incorporation in CNTs-Nation composites did not significantly alter the oxygen-containing groups on the CNTs surface. The Pt-Ru catalyst supported on CNTs-Nafion composites with 2 wt% Naton showed good dispersion and the best CO oxidation and methanol electro-oxidation activities.

关键词： carbon nanotubes-Nafion composites Pt-Ru catalysts methanol electro-oxidation

Solvent effects on Pt-Ru/C catalyst for methanol electro-oxidation

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Journal of Natural Gas Chemistry 2009年第3期18卷 341-345页

作者： Jinwei Chen Chunping Jiang Hui Lu Lan Feng Xin Yang Liangqiong Li Ruilin Wang College of Materials Science and Engineering Sichuan University Chengdu 610065 Sichuan China

Alloying degree, particle size and the level of dispersion are the key structural parameters of Pt-Ru/C catalyst in fuel cells. Solvent（s） used in the preparation process can affect the particle size and alloying degree of the object substance, which lead to a great positive impact on its properties. In this work, three types of solvents and their mixtures were used in preparation of the Pt-Ru/C catalysts by chemical reduction of metal precursors with sodium borohydride at room temperature. The structure of the catalysts was characterized by X-ray diffraction （XRD） and Transmission electron microscopy （TEM）. The catalytic activity and stability for methanol electro-oxidation were studied by Cyclic Voltammetry （CV） and Chronoamperometry （CA）. Pt-Ru/C catalyst prepared in H2O or binary solvents of H2O and isopropanol had large particle size and low alloying degree leading to low catalytic activity and less stability in methanol electro-oxidation. When tetrahydrofuran was added to the above solvent systems, Pt-Ru/C catalyst prepared had smaller particle size and higher alloying degree which resulted in better catalytic activity, lower onset and peak potentials, compared with the above catalysts. Moreover, the catalyst prepared in ternary solvents of isopropanol, water and tetrahydrofuran had the smallest particle size, and the high alloying degree and the dispersion kept unchanged. Therefore, this kind of catalyst showed the highest catalytic activity and good stability for methanol electro-oxidation.

关键词： solvent effect fuel cell methanol electro-oxidation Pt-Ru/C catalyst tetrahydrofuran

Preparation of PtSn_2–SnO_2/C nanocatalyst and its high performance for methanol electro-oxidation

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Chinese Chemical Letters 2016年第7期27卷 1083-1086页

作者： Huan Su Tie-Hong Chen Institute of New Catalytic Materials Science Key Laboratory of Advanced Energy Materials Chemistry (MOE) School of Materials Science and EngineeringNankai University

PtSn2-SnO2/C nanocatalyst was prepared by co-reduction of Pt and Sn precursor at ca,15℃.The formation of PtSn2-SnO2 nanoparticle was determined by XRD,TEM and XPS *** PtSn2-SnO2/C nanocatalyst exhibits stronger resistance to CO poisoning and effectively improves methanol electro-catalytic effect,up to 3 times than the commercial Pt/C catalyst.

关键词： Direct methanol fuel cell PtSn2–SnO2/C nanocatalyst methanol electro-oxidation Low temperature preparation Catalysis electrochemical impedance

Carbon Nanotubes Supported Pt-Ru-Ni as methanol electro-oxidation Catalyst for Direct methanol Fuel Cells

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Journal of Natural Gas Chemistry 2007年第2期16卷 162-166页

作者： Fei Ye Shengzhou Chen Xinfa Dong Weiming Lin School of Chemical and Energy Engineering South China University of Technology Guangzhou 510640 Guangdong China School of Chemistry and Chemical Engineering Guangzhou University Guangzhou 510006 Guangdong China

Carbon nanotubes （CNTs） supported Pt-Ru and Pt-Ru-Ni catalysts were prepared by chemical reduction of metal precursors with sodium borohydride at room temperature. The crystallographic properties and composition of the catalysts were characterized by X-ray diffraction （XRD） and energy dispersive X-ray （EDX） analysis, and the catalytic activity and stability for methanol electro-oxidation were measured by electrochemical impedance spectroscopy （EIS）, linear sweep voltammetries （LSV）, and chronoamperometry （CA）. The results show that the catalysts exhibit face-centered cubic （fcc） structure. The particle size of Pt-Ru-Ni/CNTs catalyst is about 4.8 nm. The catalytic activity and stability of the Pt-Ru-Ni/CNTs catalyst are higher than those of Pt-Ru/CNTs catalyst.

关键词： carbon nanotubes Pt-Ru-Ni/CNTs methanol electro-oxidation direct methanol fuel cells

Heterogeneous nanocomposites consisting of Pt_(3)Co alloy particles and CoP_(2) nanorods towards high-efficiency methanol electro-oxidation

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SmartMat 2021年第2期2卷 234-245页

作者： Niuwa Yang Dong Chen Penglei Cui Tingyu Lu Hui Liu Chaoquan Hu Lin Xu Jun Yang State Key Laboratory of Multiphase Complex Systems Chinese Academy of SciencesBeijingChina Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijingChina Nanjing IPE Institute of Green Manufacturing Industry NanjingJiangsuChina Jiangsu Key Laboratory of New Power Batteries School of Chemistry and Materials ScienceNanjing Normal UniversityNanjingJiangsuChina

Heterogeneous nanocomposites comprising chemically distinct constituents are particularly promising in *** herein report a synthetic strategy that combines the reduction of Pt and Co ionic precursors at an appropriate ratio with the subsequent phosphating at an elevated temperature for forming heterogeneous nanocomposites consisting of quasi-spherical Pt_(3)Co alloy domains and rod-like CoP_(2) domains for high-efficiency methanol *** strong electronic coupling between Pt_(3)Co and CoP_(2) domains in the nanocomposites render the electron density around Pt atoms to decrease,which is favorable for reducing the adsorption of poisoning CO-like intermediates on the catalyst ***,the as-prepared heterogeneous Pt_(3)Co–CoP_(2) nanocomposites show good performance for methanol electrooxidation both in acidic and alkaline *** specific,at a Pt loading of only 6.4%on a common carbon substrate,the mass-based activity of Pt_(3)Co–CoP_(2) nanocomposites in an acidic medium is about 2 and 1.5 times as high as that of commercial Pt/C catalyst(20%mass loading)and home-made Pt_(3)Co alloy nanoparticles(8.0%mass loading),while in the alkaline medium,these values are 3 and 2,respectively.

关键词： electrocatalysis electronic coupling methanol electro-oxidation nanocomposite Pt_(3)Co-CoP_(2)

Self-Decoration of PtNi Alloy Nanoparticles on Multiwalled Carbon Nanotubes for Highly Efficient methanol electro-oxidation

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Nano-Micro Letters 2016年第4期8卷 371-380页

作者： Yu-Yan Zhou Chang-Hai Liu Jie Liu Xin-Lei Cai Ying Lu Hui Zhang Xu-Hui Sun Sui-Dong Wang Institute of Functional Nano & Soft Materials(FUNSOM) Jiangsu Key Laboratory for Carbon-Based Functional Materials & DevicesSoochow University School of Materials Science & Engineering Jiangsu Collaborative Innovation Center of Photovoltaic Science and EngineeringChangzhou University

A simple one-pot method was developed to prepare Pt Ni alloy nanoparticles,which can be self-decorated on multiwalled carbon nanotubes in [BMIm][BF4] ionic *** nanohybrids are targeting stable nanocatalysts for fuel cell *** sizes of the supported Pt Ni nanoparticles are uniform and as small as 1–2 ***-to-Ni ratio was controllable by simply selecting a Pt Ni alloy *** alloy nanoparticles with Pt-to-Ni ratio of 1:1 show high catalytic activity and stability for methanol *** performance is much higher compared with those of both Pt-only nanoparticles and commercial Pt/C *** electronic structure characterization on the Pt Ni nanoparticles demonstrates that the electrons are transferred from Ni to Pt,which can suppress the CO poisoning effect.

关键词： PtNi nanoparticles Multiwalled carbon nanotubes methanol electro-oxidation

CeO_(2)表面工程与PtBi纳米板间p-d轨道杂化的协同效应在甲醇电氧化中的应用

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Science China Materials 2024年第6期67卷 1975-1984页

作者：张衍澳王帅司飞燕薛瑞昕吕一品陈国柱高道伟* School of Chemistry and Chemical Engineering University of JinanJinan 250022China

调控铂(Pt)电子结构是增强Pt基电催化剂活性和耐久性的关键策略.本研究开发了CeO_(2)/PtBi金属间纳米板(NPs),这种结构通过Pt和Bi之间的强p-d轨道杂化,显著提高了催化剂在甲醇电氧化反应(MOR)中的活性和稳定性.CeO_(2)的表面沉积不仅进... 详细信息

调控铂(Pt)电子结构是增强Pt基电催化剂活性和耐久性的关键策略.本研究开发了CeO_(2)/PtBi金属间纳米板(NPs),这种结构通过Pt和Bi之间的强p-d轨道杂化,显著提高了催化剂在甲醇电氧化反应(MOR)中的活性和稳定性.CeO_(2)的表面沉积不仅进一步优化了Pt的电子结构,还提供了额外的羟基吸附位点.特别是,在酸性和碱性环境下,CeO_(2)/PtBi NPs展现出超越商业Pt/C的甲醇电氧化质量活性,分别提高了1.62和7.65倍.在经历了1000次耐久性测试后,CeO_(2)/PtBi NPs在酸碱环境下的活性仅分别下降了20.1%和39.8%,相比之下,商业Pt/C的活性在相同条件下分别下降了55.4%和78.5%.CeO_(2)/PtBi NPs的这一卓越性能得益于Pt与Bi之间的p-d轨道杂化以及CeO_(2)表面工程对催化剂电子结构的有效调节.本研究为Pt基电催化剂设计提供了新的电子结构调控策略和深入见解.

关键词： electrocatalysis intermetallic p-d orbital hybridiza-tion CeO_(2)deposition methanol electro-oxidation

A high dispersed Pt_(0.35)Pd_(0.35)Co_(0.30)/C as superior catalyst for methanol and formic acid electro-oxidation

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Chinese Chemical Letters 2014年第6期25卷 907-911页

作者： Ying-Xia Wang Tie-Hong Chen Institute of New Catalytic Materials Science Key Laboratory of Advanced Energy Materials Chemistry(MOE)College of ChemistryCollaborative Innovation Center of Chemical Science and Engineering(Tianjin)Nankai University

Pt：Pd：Co ternary alloy nanoparticles were synthesized by sodium borohydride reduction under nitrogen, and were supported on carbon black as catalysts for methanol and formic acid electro-oxidation. Compared with Pt0.65C00.35/C, Pt/C, Pd0.65C00.35/C, and Pd/C catalyst, Pt0.35Pd0.35Co0.30/C exhibited relatively high durability and strong poisoning resistance, and the Pt-mass activity was 3.6 times higher than that of Pt/C in methanol oxidation reaction. Meanwhile, the Pt0.35Pd0.35Co0.30/C exhibited excellent activity with higher current density and higher CO tolerance than that of Pt0.6sCo0.35/C, Pt/C, Pd0.65C00.35/ C, and Pd/C in formic acid electro-oxidation.

关键词： Fuel cell Ternary alloy Formic acid oxidation methanol electro-oxidation

Morphology-dependent electrocatalytic performance of Fe_(2)(MoO_(4))_(3) for electro-oxidation of methanol in alkaline medium

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Journal of Materiomics 2017年第2期3卷 135-143页

作者： Daoming Zhang Liheng Zhang Wei Zhang Mengfei Huo Jiajia Yin Guoju Dang Zhen Ren Quansheng Zhang Jingying Xie Samuel S.Mao School of Chemical and Environmental Engineering Shanghai Institute of TechnologyShanghai 201418China Shanghai Institute of Space Power Sources Shanghai 200245China Department of Mechanical Engineering University of California at BerkeleyBerkeley CA94720USA Samuel Mao Institute of New Energy Science HallShenzhen 518031China

electrochemically synthesized nanosphere,nanorod and nanotube Fe_(2)(MoO_(4))_(3) at optimized temperature and current density are characterized with XRD,SEM,TEM,*** lattices of the three types Fe_(2)(MoO_(4))_(3) detected by HRTEM are well matched with the simulation analysis results from Materials Studio 6.0 based on the inorganic crystal structure database(ICSD)data and the modified XRD lattice *** ratios of Fe/Mo on the surface resulted from XPS analysis are 1.47,1.63 and 2.22 respectively for nanosphere,nanorod and *** mixture of Fe_(2)(MoO_(4))_(3) with polytetrafluoroethylene dispersion are coated on glass carbon substrate as electrode for electrocatalytic performance test by cyclic voltammetries in 0.1 mol/L KOH and 1 mol/L methanol *** oxidation peak current density of the Nanotube-Fe_(2)(MoO_(4))_(3)/GCEs electrode is 3.27 mA/cm^(2) higher than 2.8 mA/cm^(2) of platinum foil electrode,which shows enhanced catalytic activity of Nanotube-Fe_(2)(MoO_(4))_(3)/*** cyclic stability in terms of peak current retention are 91%,92%and 88%respectively for Nanosphere-Fe_(2)(MoO_(4))_(3)/GCE,Nanorod-Fe_(2)(MoO_(4))_(3)/GCE and Nanotube-Fe_(2)(MoO_(4))_(3)/GCE electrode after 220 *** is concluded that nanosized Fe_(2)(MoO_(4))_(3) could be promising alternative non-noble electro-catalysts for electro-oxidation of methanol in alkaline medium.

关键词： electrochemistry methanol electro-oxidation Fe_(2)(MoO_(4))_(3)