Interfacial Electrochemistry and Electrocatalysis: Understanding and Directing Electrochemical Phenomena at the Molecular Level

界面电化学和电催化：在分子水平上理解和指导电化学现象

• 批准号: RGPIN-2017-05610
• 负责人: Jerkiewicz, Gregory
• 金额: $ 4.37万
• 依托单位: Queen's University
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2020
• 资助国家: 加拿大
• 起止时间: 2020-01-01 至 2021-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=711745
• 关键词: Interfacial; Electrochemistry; Electrocatalysis; Understanding; Directing

Our research in electrochemistry and electrocatalysis consists of three innovative thrusts that will be concurrently pursued to gain molecular-level understanding of electrochemical phenomena, discover new properties of materials, and develop new theories of electrochemical processes. We will synthesize Pd nanoparticles (Pd-NPs) of controlled shape and size, and characterize their structures and compositions using materials science methods (transmission electron microscopy, TEM, X-ray diffraction, XRD, electron tomography, ET). Their H absorbing capacity will be examined using electrochemical techniques (cyclic-voltammetry, CV, chrono-amperometry, CA, and chrono-coulometry, CC). The amount of absorbed H will be related to the size and shape of Pd-NPs to identify parameters that define their absorbing capacity. Absorption isotherms will be prepared to examine thermodynamics of the process and materials science techniques to analyze the structure of Pd-NPs upon H ingress. We will investigate composition-size-structure-reactivity phenomena in electrocatalysis by studying mechanisms and kinetics of the oxygen reduction and evolution reactions (ORR, OER). We will synthesize Pt, PtNi and PtCo nanoparticles and single crystals, and employ them as catalysts for ORR and OER. Their activity will be evaluated using electrochemical techniques (Tafel plots, polarization curves, CV, and CA). Electrochemical and analytical techniques (inductively coupled plasma mass spectrometry, ICPMS) will be used to examine degradation of these materials. Structure and composition of the electrode materials prior to and after electrochemical measurements will be analyzed using TEM, XRD, ET, scanning electron microscopy (SEM), and energy-dispersive X-ray spectroscopy (EDS). Comparison of results will shed light on composition-size-structure-reactivity phenomena and properties. Mass changes that accompany interfacial electrochemical processes are poorly understood and require examination over a broad temperature range. We will develop and apply variable-temperature electrochemical quartz crystal nanobalance (VT-EQCN) to examine interfacial electrochemical processes, such as catalyst oxidation and degradation. The technique will reveal T-dependent structure-forming and structure-breaking processes. The research program creates an opportunity for breakthroughs and discoveries. It is ambitious and challenging but my well-trained HQP are able to successfully undertake difficult projects. Though the research is fundamental in nature, it will benefit electrochemical technologies by creating new knowledge. Finally, HQP trained as part of this project will acquire knowledge in electrochemistry and electrocatalysis, and will develop a unique set of inter-disciplinary skills, which will enhance their future careers.

我们在电化学和电催化方面的研究包括三个创新的推力，这些推力将同时追求，以获得对电化学现象的分子级别的理解，发现材料的新特性，并发展了电化学过程的新理论。 我们将使用材料科学方法（透射电子显微镜，TEM，X射线衍射，XRD，Electron estrography，ET）合成受控形状和大小的PD纳米颗粒（PD-NP）。 它们的H吸收能力将使用电化学技术（Cyclic-voltammetry，CV，CAR-Mempermetry，CA和Chrono-Coulometry，CC）检查。 吸收H的量将与PD-NP的大小和形状有关，以识别定义其吸收能力的参数。 吸收等温线将准备好检查过程和材料科学技术的热力学，以分析h入口时PD-NP的结构。 我们将通过研究氧还原和进化反应的机制和动力学（ORR，OER）来研究电催化中的组成部分结构反应现象。 我们将合成PT，PTNI和PTCO纳米颗粒以及单晶，并用作ORR和OER的催化剂。 它们的活性将使用电化学技术（Tafel图，极化曲线，CV和CA）进行评估。 电化学和分析技术（电感耦合等离子体质谱法，ICPMS）将用于检查这些材料的降解。 电极材料在电化学测量之前和之后的结构和组成将使用TEM，XRD，ET，扫描电子显微镜（SEM）和能量分散性X射线光谱（EDS）分析。 结果的比较将阐明组成大小的结构反应性现象和特性。 界面电化学过程伴随的质量变化知之甚少，需要在广泛的温度范围内检查。 我们将开发和应用可变的电化学石化石英晶体纳米平衡（VT-EQCN）检查界面电化学过程，例如催化剂氧化和降解。 该技术将揭示依赖于T的结构形成和破坏结构的过程。 该研究计划为突破和发现创造了机会。 这是雄心勃勃且具有挑战性的，但我训练有素的HQP能够成功地进行困难的项目。 尽管这项研究本质上是基本的，但它将通过创建新知识而受益于电化学技术。 最后，接受过该项目的一部分培训的HQP将获得电化学和电催化的知识，并将发展一系列独特的跨学科技能，这将增强其未来的职业。