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利用国仪量子台式 EPR200M 与新型 3D 打印扁平电解池，在电化学反应中原位、时间分辨地捕捉氨基与酚类自由基中间体，为机理研究提供直接证据。
本文为英文官网技术文章的中文概述：理解自由基中间体的形成是控制电化学反应速率与选择性的关键。借助国仪量子台式 EPR200M 的原位 operando EPR，研究团队结合 3D 打印扁平电解池，可在反应中原位捕捉自由基并解析其形成顺序与结构。以下为英文原文正文。
Understanding the formation of radical intermediates is key to controlling electrochemical reaction rates and selectivity. These short-lived species at the electrode interface dictate outcomes, and relying solely on final products can lead to speculative mechanisms. With operando EPR using CIQTEK benchtop EPR200M, researchers can directly capture radicals in situ, mapping their formation sequence and structural fingerprints for robust mechanistic evidence.
A recent collaboration between Beijing University of Technology, Tsinghua University and Wuhan University introduced a novel 3D-printed electrolytic cell tailored for in situ EPR. Fabricated with high-precision digital light processing (DLP), this flat cell enables reproducible integration with electrochemical systems. Their results, published in Chemical Engineering Journal, demonstrate the workflow's ability to uncover radical structures across representative reactions.
High-dielectric solvents commonly used in electrochemical cells reduce EPR signal-to-noise, making radical detection challenging. The flat cell design mitigates dielectric losses and enhances the resonator's Q factor, improving operando EPR performance. Using DLP 3D printing, electrode channels, positioning structures, and short-circuit protection are fixed during fabrication, eliminating manual variability, reducing system resistance, and improving signal quality while maintaining mechanical strength, solvent compatibility, and cost efficiency. This approach transforms operando EPR into a workflow of "standardized structural component + reproducible procedure."
In situ EPR with time-resolved acquisition allows mapping radicals in real time, showing which species appear first and how they evolve. This provides a reproducible evidence chain at the intermediate level, moving mechanistic understanding beyond product-based inference.
