New pathways in electrochemical energy conversion

可再生能源稀少且断断续续，除了少数例外，它们只能发电。我们不能大量储存电力，而且要储存或产生足够的电力来为长途旅行(航空、货运、海运、铁路等)提供动力是具有挑战性的。更重要的是，将任何能源转化为电力是简单的，但很难将电力转化为化学品或燃料。这种不对称性是我们当前能源系统的决定性缺陷之一：下一代电化学能量转换设备必须解决这一问题。*目前，电化学设备(燃料电池、电镀膜)受到反应和降解速率以及电极界面材料(例如催化剂)的成本和可制造性的限制。本提案将研究这些界面上的电荷、质量和热传输现象。在过去的六年中开发了几种实验技术和平台，包括设计性实验、电容测量和电化学阻抗谱。*拟议研究的一个新方面包括纳入表征良好的电极拓扑等效物(以补充商业材料和体系结构)。这种方法将物理模型与模型系统中的结构、组成和拓扑信息联系起来，并与现实条件下的细胞性能联系起来。*预期的突破包括：i)改进润湿性和毛细现象理论的新证据；ii)电极结构和燃料电池功能之间的确定性联系(S)；iii)新型电化学装置的指令性设计。除了燃料电池，研究成果还适用于电镀膜、自清洁表面、液体透镜、芯片实验室系统和智能薄膜。该研究计划将培养1名博士后研究员、4名研究生和5名本科生，他们的专业领域包括电化学、氢技术、实验设计、纳米技术、热质传输和燃料电池设计。这些领域需要的技能可以转移到对加拿大具有战略重要性的许多行业(碳捕获和利用、能源储存和低碳运输)。

Renewable energy sources are sparse and intermittent, and with a few exceptions, they can only generate electricity. We cannot store electricity in large quantities, and it is challenging to store or generate enough electricity to power long-range travel (air, freight, marine, rail, etc.) More importantly, the conversion of any energy source intro electricity is straightforward, but is difficult to convert electricity into chemicals or fuels. This asymmetry is one of the defining deficiencies of our current energy system: one that must be resolved by the next generation of electrochemical energy conversion devices.******Currently, electrochemical devices (fuel cells, electroayzers) are limited by the reaction and degradation rates, as well as the cost and manufacturability of materials (e.g., catalysts) at electrode interfaces. The present proposal will investigate the charge-, mass-, and heat-transport phenomena at these interfaces. Several experimental techniques and platforms developed in the last six years, including designed experiments, capacitance measurements, and electrochemical impedance spectroscopy.*** ***A novel aspect of the proposed research consists of incorporating well-characterized topological equivalents for electrodes (to complement commercial materials and architectures). This approach will link physical models to the structure, composition and topological information in model systems, and to cell performance under realistic conditions. At least one of these elements has been missing in previous efforts.******The expected breakthroughs include: i) new evidence to improve theories for wettability and capillary phenomena ii) deterministic links between electrode structure and fuel cell function(s), and iii) prescriptive designs for a new class of electrochemical devices. Beyond fuel cells, the research outcomes are applicable to electroayzers, self-cleaning surfaces, liquid lenses, lab-on-a-chip systems, and smart membranes.******The research program will train one postdoctoral fellow, four graduate students and five undergraduate students in the areas of electrochemistry, hydrogen technology, design of experiments, nanotechnology, heat and mass transport, and fuel cell design. These areas require skills that are transferrable to many industries in areas of strategic importance for Canada (carbon capture and utilization, energy storage, and low-carbon transportation.)