This study investigates the electrochemical reduction of CO₂ on nickel (Ni) using a Fischer-Tropsch-like mechanism, focusing on the effects of temperature, potential, partial pressure, and electrolyte composition on hydrocarbon chain growth and catalyst deactivation. The research shows that while higher temperatures increase the activity of CO₂ reduction, they also promote coking, which deactivates the catalyst. The selectivity and chain growth probability are mainly influenced by potential and electrolyte composition. CO reduction exhibits lower activity but higher chain growth probability compared to CO₂ reduction. The rate-determining step is hypothesized to be a hydrogenation process, either involving *CO hydrogenation or chain termination. The study highlights the importance of electrolyte composition and cation effects on reaction efficiency. It also demonstrates that the formation of hydrocarbons follows a chain growth mechanism similar to the Fischer-Tropsch reaction, with the chain growth probability decreasing with increasing temperature. The results suggest that optimizing electrolyte conditions and catalyst preparation can enhance the performance of Ni for CO₂ reduction. The study provides insights into the electrochemical mechanisms underlying CO₂ reduction and opens avenues for further development of Ni as an efficient catalyst for this process.This study investigates the electrochemical reduction of CO₂ on nickel (Ni) using a Fischer-Tropsch-like mechanism, focusing on the effects of temperature, potential, partial pressure, and electrolyte composition on hydrocarbon chain growth and catalyst deactivation. The research shows that while higher temperatures increase the activity of CO₂ reduction, they also promote coking, which deactivates the catalyst. The selectivity and chain growth probability are mainly influenced by potential and electrolyte composition. CO reduction exhibits lower activity but higher chain growth probability compared to CO₂ reduction. The rate-determining step is hypothesized to be a hydrogenation process, either involving *CO hydrogenation or chain termination. The study highlights the importance of electrolyte composition and cation effects on reaction efficiency. It also demonstrates that the formation of hydrocarbons follows a chain growth mechanism similar to the Fischer-Tropsch reaction, with the chain growth probability decreasing with increasing temperature. The results suggest that optimizing electrolyte conditions and catalyst preparation can enhance the performance of Ni for CO₂ reduction. The study provides insights into the electrochemical mechanisms underlying CO₂ reduction and opens avenues for further development of Ni as an efficient catalyst for this process.