Addressing the carbonate issue in electrochemical CO₂ reduction reaction (CO₂RR) under acidic conditions is crucial for improving CO₂ conversion efficiency and avoiding the formation of (bi)carbonate byproducts. While neutral/alkaline electrolytes are commonly used, they lead to significant challenges due to carbonate formation, reducing carbon utilization efficiency and causing device instability. Acidic electrolytes offer a promising solution but face competition from the hydrogen evolution reaction (HER), requiring advanced catalysts and electrode designs for high selectivity and activity. This review discusses recent developments in acidic CO₂RR, including reaction mechanisms, catalyst design, and device engineering. It highlights the importance of understanding reaction pathways and optimizing catalysts for efficient CO₂ conversion. Key challenges include improving selectivity, activity, stability, and scalability of acidic CO₂RR catalysts. Recent advances in heterogeneous catalysts, surface immobilized molecular catalysts, and catalyst surface enhancement are presented, along with progress in device-level applications. The review emphasizes the need for further research to develop high-performance acidic CO₂RR systems.Addressing the carbonate issue in electrochemical CO₂ reduction reaction (CO₂RR) under acidic conditions is crucial for improving CO₂ conversion efficiency and avoiding the formation of (bi)carbonate byproducts. While neutral/alkaline electrolytes are commonly used, they lead to significant challenges due to carbonate formation, reducing carbon utilization efficiency and causing device instability. Acidic electrolytes offer a promising solution but face competition from the hydrogen evolution reaction (HER), requiring advanced catalysts and electrode designs for high selectivity and activity. This review discusses recent developments in acidic CO₂RR, including reaction mechanisms, catalyst design, and device engineering. It highlights the importance of understanding reaction pathways and optimizing catalysts for efficient CO₂ conversion. Key challenges include improving selectivity, activity, stability, and scalability of acidic CO₂RR catalysts. Recent advances in heterogeneous catalysts, surface immobilized molecular catalysts, and catalyst surface enhancement are presented, along with progress in device-level applications. The review emphasizes the need for further research to develop high-performance acidic CO₂RR systems.