Superaerophobic porous 3D catalytic electrodes for water splitting********

用于水分解的超疏气多孔 3D 催化电极********

• 批准号: 521504-2018
• 负责人: GUAY, Daniel
• 金额: $ 9.44万
• 依托单位: Institut national de la recherche scientifique
• 依托单位国家: 加拿大
• 项目类别: Strategic Projects - Group
• 财政年份: 2018
• 资助国家: 加拿大
• 起止时间: 2018-01-01 至 2019-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=652581
• 关键词: Superaerophobic; porous; 3D; catalytic; electrodes

Electrolytic gas evolution reactions (GERs) are important in numerous electrochemical reactions and processes like alkaline water and chlorine electrolysis. The efficiency of such electrochemical processes depend on the proper choice of electrocatalytic materials that can achieve high reaction rates (i.e. high current densities) at the lowest possible overpotential. However, the formation of adhering bubbles at the electrode surface has a detrimental effect on the cell performance by decreasing the contact between the catalyst surface and the reactants, as well as increasing the ohmic drop. The overarching goal of this proposal is to foster passive management of bubbles through nano-engineering of the electrode surface. Thus, a comprehensive study of the effect of nano-morphology of the electrode surface will be undertaken with the objectives of decreasing bubble size, adhesion force and residence time. This will be achieved using additive manufacturing approach leveraging the expertise of our industrial partners (NRC-Boucherville, Centerline and Vac Aero) with the objective of developing new knowledge AND identifying a proper way to mass produce electrodes with improved passive gas bubbles management on scales required for integration into manufacturing products for said markets like water electrolysers in conjunction with Hydrogenics. In terms of operating parameters, improved management of gas bubbles at GER electrodes will have several benefits: (i) strong diminution of gas blanketing; (2) enhance local heat/mass transfer coefficients, therefore permitting higher current density operation, and (3) use of bubble flow and gas lift to minimize parasitic losses from external fluid management in near-zero gap electrochemical cells that will translate into reduced overpotentials, increased current density, and higher overall process efficiency. A total of 10 HQPs are going to be trained, including 2PhDs, 2MScs, 2PDFs and 4 undergraduates.********

电解气体析出反应（GERs）在许多电化学反应和过程中都很重要，如碱水和氯电解。这种电化学过程的效率取决于电催化材料的正确选择，这些材料可以在尽可能低的过电位下实现高反应速率（即高电流密度）。然而，在电极表面形成的粘附气泡会减少催化剂表面与反应物之间的接触，并增加欧姆降，从而对电池性能产生不利影响。本提案的总体目标是通过电极表面的纳米工程来促进气泡的被动管理。因此，将对电极表面纳米形貌的影响进行全面的研究，以减小气泡尺寸、附着力和停留时间。这将通过利用我们的工业合作伙伴（NRC-Boucherville， Centerline和Vac Aero）的专业知识，利用增材制造方法来实现，目的是开发新知识，并确定一种适当的方法来大规模生产电极，并改进被动气泡管理，以整合到上述市场的制造产品中，如与氢能相结合的水电解槽。在操作参数方面，改进对GER电极气泡的管理将有几个好处：(i)气体覆盖的强烈减少；(2)提高局部传热/传质系数，从而允许更高的电流密度操作；(3)利用气泡流和气举来最大限度地减少近零间隙电化学电池外部流体管理带来的寄生损失，从而降低过电位，增加电流密度，提高整体工艺效率。共培养10名HQPs，包括2名博士、2名msc、2名pdf和4名本科生。********