scheme2
![Advancements in two-dimensional covalent organic framework nanosheets for electrocatalytic energy conversion: current and future prospects](https://image.oaes.cc/9f628c62-75d5-41f4-9da5-5a1d7a1b20ab/em4072.scheme.2.jpg)
Scheme 2. Types of porous organic polymer frameworks and their coupling chemistries. Porous polymers from left to right: COFs. Reproduced with permission. Copyright 2021, Elsevier[33]. HCPs. Reproduced with permission. Copyright 2021, Elsevier[34]. CTFs. Reproduced with permission. Copyright 2013, American Chemical Society[35]. PAFs. Reproduced with permission. Copyright 2020, American Chemical Society[36]. Conjugated CMPs. Reproduced with permission. Copyright 2022, Elsevier[37].