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Electrodeposited PtNi nanoparticles towards oxygen reduction reaction:A study on nucleation and growth mechanism

Chinese Journal of Catalysis 2021年第11期42卷 2068-2077页

作者： Lutian Zhao Yangge Guo Cehuang Fu Liuxuan Luo Guanghua Wei Shuiyun Shen Junliang Zhang Institute of Fuel Cells Key Laboratory for Power Machinery and Engineering of MOESchool of Mechanical EngineeringShanghai Jiao Tong UniversityShanghai 200240China SJTU-ParisTech Elite Institute of Technology Shanghai Jiao Tong UniversityShanghai 200240China

In this work,highly monodispersed Pt-Ni alloy nanoparticles were directly deposited on carbon substrate through a facile electrodeposition strategy in the solvent system of N,N-dimethylformamide(DMF).A series of carbon supported Pt-Ni alloy electrocatalysts were synthesized under different applied electrode *** all as-obtained samples,the Pt-Ni/C electrocatalyst deposited at-1.73 V exhibits the optimal specific activity up to 1.850 mA cm^(-2)at 0.9 V ***,which is 6.85 times higher than that of the commercial Pt/*** physiochemical characterizations and computational evaluations via density functional theory were conducted to unveil the nucleation and growth mechanism of PtNi alloy *** to the aqueous solution,DMF solvent molecule must not be neglected in avoiding particle agglomeration and synthesis of monodispersed *** the alloy co-deposition process,Ni sites produced through the reduction of Ni(Ⅱ)precursor not only facilitates Pt-Ni alloy crystal nucleation but also in favor of further Pt reduction on the Ni-inserted Pt *** for the deposition potential,it adjusts the final particle *** work provides a hopeful extended Pt-based catalyst layer production strategy for proton exchange membrane fuel cells and a new idea for the nucleation and growth mechanism exploration for electrodeposited Pt alloy.

关键词： Electrodeposition PtNi alloy nanoparticles Oxygen reduction reaction nucleation and growth mechanism Density functional theory

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Nanocrystals:Solution-Based Synthesis and Applications as Nanocatalysts

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Nano Research 2009年第1期2卷 30-46页

作者： Dingsheng Wang Ting Xie Yadong Li Department of Chemistry Tsinghua UniversityBeijing 100084China

Nanocrystals are emerging as key materials due to their novel shape-and size-dependent chemical and physical properties that differ drastically from their bulk *** main challenges in this field remain rationally controlled synthesis and large scale *** article reviews recent progress in our laboratory related to solution-based synthesis of various nanostructures,including zero-dimensional(0-D)nanocrystals,1-D nanowires and nanorods,hollow structures,and superlattice *** the other hand,the essential goal for nanoresearchers is to achieve industrial applications of nanostructured *** the past decades,these fascinating materials have been widely used in many promising fields such as nanofabrication,nanodevices,nanobiology,and ***,we focus on their applications as nanocatalysts and try to illustrate the main problems and future directions in this area based on our recent endeavors in catalytic applications of nanocrystals.

关键词： Nanocrystals solution-based synthesis nucleation and growth mechanism nanocatalysts

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Electrochemical Quartz Crystal Microbalance(EQCM) Characterization of Electrodeposition and Catalytic Activity of Pd-based Electrocatalysts for Ethanol Oxidation

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Chemical Research in Chinese Universities 2010年第3期26卷 443-448页

作者： KE Xi DENG Lu-lu SHEN Pei-kang CUI Guo-feng State Key Laboratory of Optoelectronic Materials and Technologies School of Physics and Engineering School of Chemistry and Chemical Engineering Sun Yat-Sen University Guangzhou 510275 P. R. China

Pd was electrochemically deposited on gold-coated quartz crystals at nanogram-level. The coulombic efficiency and initial nucleation and growth mechanism of potentiostatic Pd deposition were investigated via in situ electrochemical quartz crystal microbalance（EQCM）. The coulombic efficieneies are 84%, 93% and 95% for Pd deposition at 0.3, 0.2 and 0.1 V（vs. SCE）, respectively. The results of chronoamperometric measurements show that the Pd deposition proceeded by an instantaneous nucleation（at 0.3 V） or progressive nucleation（at 0.2 and 0.1 V） in a three-dimensional（3D） growth mode. The catalytic activity of Pd-based electrocatalyst for ethanol oxidation was characterized in an alkaline solution. It was found that the highest mass activity for ethanol oxidation on Pd-based electrocatalyst is 1.8× 10^4 A/（g Pd） deposited at 0.3 V for 5 s.

关键词： Coulombic efficiency nucleation and growth mechanism Electrochemical quartz crystal microbalance Palladium Ethanol oxidation

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Experimental and Computational Study of the Effect of Temperature on the Electro-Polymerization Process of Thiophene

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Open Journal of Organic Polymer Materials 2013年第3期3卷 59-67页

作者： María Belén Camarada MRomero MCGiménez WSchmickler MAdel Valle Lab.Electroquímica de Polímeros Departamento de Química InorgánicaFacultad de QuímicaPontificia Universidad Católica ChileAv.Vicuna MackennaSantiagoChile Nanobiotechnology Division at University of Talca Fraunhofer Chile Research Foundation-Center for Systems BiotechnologyFCR-CSBTalcaChile FEG FaMAFUniversidad Nacional de CórdobaCórdobaArgentina Department of Theoretical Chemistry Ulm UniversityUImGermany

Temperature effect on the nucleation and growth mechanisms (NGM) of poly(thiophene) (PTh) was investigated through experimental and computational tools. The computational simulation method was based on a kinetic Monte Carlo algorithm. It reproduced key processes such as diffusion, oligomerization, and the precipitation of oligomers onto the electrode surface. Electrochemical synthesis conditions at temperatures between 263 and 303 K were optimized. The deconvolution of the i-t transients reflected two contributions: a progressive nucleation with three-dimensional growth controlled by diffusion and the other by charge transfer, PN3Ddif and PN3Dct, respectively. As temperature decreased, a diminution of the charge associated to each contribution was observed and the nucleation induction time increased. Experimental and computational evidence indicated that temperature does not change the nucleation and growth mechanism (NGM). This effect was ascribed to kinetic factors rather than to film conductivity. This work contrasts simulation and experimental evidence and demonstrates how computational simulations can help to understand the electrochemical process of conducting polymers formation.

关键词： Kinetic Monte Carlo Conducting Polymers Thiophene Electro-Polymerization nucleation and growth mechanism

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