The electrochemical activation of C-X bonds requires very negative electrode potentials. Lowering the overpotentials and increasing the catalytic activity requires intensive electrocatalytic research. A profound understanding of the reaction mechanism and the influence of the electrocatalyst allows optimal tuning of the electrocatalyst. This can be achieved by combining electrochemical techniques with electron paramagnetic resonance (EPR) spectroscopy. Although this was introduced in the mid-twentieth century, the application of this combined approach in electrocatalytic research is underexploited. Several reasons can be listed, such as the limited availability of EPR instrumentation and electrochemical devices for such in situ experiments. In this work, a simple and inexpensive construction adapted for in situ EPR electrocatalytic research is proposed. The proof of concept is provided by studying a model reaction, namely the reductive cyclisation of allyl 2-bromobenzyl ether which has interesting industrial applications.

CX键的电化学激活需要非常负的电势。降低过电势并提高催化活性需要深入的电催化研究。对反应机理和电催化剂影响的深刻理解可以使电催化剂达到最佳状态。这可以通过将电化学技术与电子顺磁共振（EPR）光谱相结合来实现。尽管这是在20世纪中叶引入的，但是这种联合方法在电催化研究中的应用还没有得到充分利用。可以列举几个原因，例如用于这种原位实验的EPR仪器和电化学装置的可用性有限。在这项工作中，提出了一种适用于原位EPR电催化研究的简单廉价的结构。通过研究模型反应，即具有有趣的工业应用的烯丙基2-溴苄基醚的还原环化，可以提供概念验证。