fig4
![Deuterium labelling by electrochemical splitting of heavy water](https://image.oaes.cc/9699c72e-db90-46f1-b24a-04234ef6b08b/4449.fig.4.jpg)
Figure 4. (A) Schematic of zero-gap electrolyzer using gas diffusion electrode technologies. Modified with permission from ref.[81] (Copyright 2019 Science Publishing Group). (B) Stacked and scalable microfluidic redox-neutral electrochemistry flow cell. Modified with permission from ref.[82] (Copyright 2020 Science Publishing Group). (C) A practical flow cell to convert CO2 into ethylene oxide. Modified with permission from ref.[83] (Copyright 2020 Science Publishing Group).