Collaborative Research: In Situ Surface Spectroscopy of 2D Material-based Electrocatalysis and Photoelectrocatalysis

合作研究：二维材料电催化和光电催化的原位表面光谱

• 批准号: 2012661
• 负责人: Wei Xiong
• 金额: $ 30万
• 依托单位: University of California-San Diego
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2020
• 资助国家: 美国
• 起止时间: 2020-08-01 至 2024-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2012661&HistoricalAwards=false
• 关键词: Collaborative; Research; Situ; Surface; Spectroscopy

Electrochemical and photoelectrochemical processes are important to a wide range of energy-related and environmental applications, including solar energy storage and carbon remediation. Photoelectrochemical hydrogen production is especially exciting for its potential to convert solar energy into carbon-free chemical fuels. The project will enable increased efficiency of photoelectrocatalytic reactions through study of the fundamental physical and chemical processes occurring in a class of ultrathin catalytic materials important for the sustainable production of fuels and chemicals.The study will investigate electrocatalysis (EC) and photoeletrocatalysis (PEC) in two-dimensional dichalcogenide materials using various forms of in situ linear, nonlinear, and ultrafast spectroscopy to characterize three critical factors in EC/PEC reactions: interfacial electrostatics (local (i.e., surface) electrostatic fields), interfacial dynamics and electrostatics (photoexcited charge carrier dynamics), and interfacial molecular structures (surface bound intermediate species) produced during the EC and PEC processes. Sum frequency generation (SFG), second harmonic generation (SHG), vibrational Stark Shift (VSS) spectroscopy, and transient absorption spectroscopy (TAS) will be employed to reveal key mechanistic information regarding the EC and PEC processes primarily for the reduction of CO2 to methanol and carbon monoxide. Spectroscopic data will be acquired in situ as a function of the electrochemical potential and electrolyte composition, and correlated with product yield and selectivity. The project includes educational and outreach activities that build upon the research to promote engagement of students in science, technology, engineering and mathematics (STEM) disciplines. These activities, which include workshop for high school science teachers, are directed at improving the education of promising high school students and encouraging their interest in STEM careers.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

电化学和光电化学过程对于广泛的能源相关和环境应用（包括太阳能存储和碳修复）是重要的。光电化学制氢因其将太阳能转化为无碳化学燃料的潜力而尤其令人兴奋。该项目将通过研究一类对燃料和化学品的可持续生产至关重要的光催化材料中发生的基本物理和化学过程，提高光电催化反应的效率。该研究将利用各种形式的原位线性，非线性，和超快光谱来表征EC/PEC反应中的三个关键因素：界面静电（局部（即，表面）静电场）、界面动力学和静电学（光激发电荷载流子动力学）以及在EC和PEC过程期间产生的界面分子结构（表面结合的中间物质）。和频发生（SFG），二次谐波发生（SHG），振动斯塔克位移（VSS）光谱，和瞬态吸收光谱（TAS）将被用来揭示关键的机械信息EC和PEC过程主要是为减少CO2甲醇和一氧化碳。 光谱数据将在现场获得的电化学电位和电解质组成的函数，并与产品收率和选择性。 该项目包括在研究基础上开展的教育和外联活动，以促进学生参与科学，技术，工程和数学（STEM）学科。这些活动，其中包括高中科学教师研讨会，旨在改善有前途的高中生的教育，并鼓励他们对STEM职业的兴趣。该奖项反映了NSF的法定使命，并已被认为值得通过使用基金会的智力价值和更广泛的影响审查标准进行评估的支持。