The chapter discusses the use of conjugated microporous polymers (CMPs) as a promising and environmentally friendly solution for the capture and utilization of carbon dioxide (CO₂). CMPs are characterized by their ease of synthesis, chemical and thermal stability, large surface areas, and tunable porous frameworks, making them highly efficient CO₂ capture materials. They can be used for both chemical conversion and electrochemical reduction of CO₂ into valuable products. **1. Introduction** - **Impact of CO₂ on Climate Change:** The rise in atmospheric CO₂ levels due to fossil fuel combustion has led to severe climate changes, with projections indicating a significant increase in temperature by 2100. - **Importance of CO₂ Capture and Conversion:** CO₂ capture and conversion are crucial for mitigating climate change and utilizing this greenhouse gas. CMPs offer a more efficient and sustainable approach compared to traditional methods like metal-organic frameworks (MOFs) and amine scrubbing. - **CMPs as Potential CO₂ Conversion Catalysts:** CMPs are versatile materials with tunable properties, making them suitable for various applications including adsorption, catalysis, and energy storage. They combine the advantages of homogeneous and heterogeneous catalysts, offering high catalytic activity and recyclability. **2. Chemical Conversion** - **Fundamental Principles of the Chemical Conversion of CO₂:** The cycloaddition reaction of CO₂ with epoxides to form cyclic carbonates is a key process. This reaction involves epoxide activation, CO₂ activation, and dual activation mechanisms. - **CMPs for the Chemical Conversion of CO₂:** CMP-based catalysts can be metal-containing or metal-free. Metalated CMPs, such as those with salen, porphyrin, and pyridine ligands, have shown excellent catalytic activity in converting CO₂ to cyclic carbonates. Metal-free CMPs, like those with nitrogen-rich frameworks, also exhibit high catalytic efficiency without the need for co-catalysts. **3. Electrochemical CO₂ Reduction (ECO2R)** - **Fundamental Principles of the ECO2R:** Electrochemical conversion involves three steps: CO₂ activation, surface reaction, and product desorption. Catalysts are essential to overcome the high energy barrier for breaking the C=O bond in CO₂. - **Catalyst Design:** Ideal catalysts should operate at low overpotentials with high Faradaic efficiency, current density, and energy efficiency. Research efforts focus on developing better materials and optimizing electrochemical processes. The chapter highlights the potential of CMPs in both chemical and electrochemical CO₂ conversion, emphasizing their role in creating a sustainable and eco-friendly future.The chapter discusses the use of conjugated microporous polymers (CMPs) as a promising and environmentally friendly solution for the capture and utilization of carbon dioxide (CO₂). CMPs are characterized by their ease of synthesis, chemical and thermal stability, large surface areas, and tunable porous frameworks, making them highly efficient CO₂ capture materials. They can be used for both chemical conversion and electrochemical reduction of CO₂ into valuable products. **1. Introduction** - **Impact of CO₂ on Climate Change:** The rise in atmospheric CO₂ levels due to fossil fuel combustion has led to severe climate changes, with projections indicating a significant increase in temperature by 2100. - **Importance of CO₂ Capture and Conversion:** CO₂ capture and conversion are crucial for mitigating climate change and utilizing this greenhouse gas. CMPs offer a more efficient and sustainable approach compared to traditional methods like metal-organic frameworks (MOFs) and amine scrubbing. - **CMPs as Potential CO₂ Conversion Catalysts:** CMPs are versatile materials with tunable properties, making them suitable for various applications including adsorption, catalysis, and energy storage. They combine the advantages of homogeneous and heterogeneous catalysts, offering high catalytic activity and recyclability. **2. Chemical Conversion** - **Fundamental Principles of the Chemical Conversion of CO₂:** The cycloaddition reaction of CO₂ with epoxides to form cyclic carbonates is a key process. This reaction involves epoxide activation, CO₂ activation, and dual activation mechanisms. - **CMPs for the Chemical Conversion of CO₂:** CMP-based catalysts can be metal-containing or metal-free. Metalated CMPs, such as those with salen, porphyrin, and pyridine ligands, have shown excellent catalytic activity in converting CO₂ to cyclic carbonates. Metal-free CMPs, like those with nitrogen-rich frameworks, also exhibit high catalytic efficiency without the need for co-catalysts. **3. Electrochemical CO₂ Reduction (ECO2R)** - **Fundamental Principles of the ECO2R:** Electrochemical conversion involves three steps: CO₂ activation, surface reaction, and product desorption. Catalysts are essential to overcome the high energy barrier for breaking the C=O bond in CO₂. - **Catalyst Design:** Ideal catalysts should operate at low overpotentials with high Faradaic efficiency, current density, and energy efficiency. Research efforts focus on developing better materials and optimizing electrochemical processes. The chapter highlights the potential of CMPs in both chemical and electrochemical CO₂ conversion, emphasizing their role in creating a sustainable and eco-friendly future.