The carbon dioxide reduction reaction (CO₂RR) could reduce the atmospheric CO₂ and store the excess energy obtained by renewable sources. However, proper catalysts are sought to reduce the high overpotentials needed to electroreduce CO₂ and improve the selectivity toward a desired product. Through rational synthetic control, it is possible to obtain nanocrystals (NCs) with a certain shape, which is translated into a preferential surface orientation. Given the structure sensitivity of the CO₂RR, the use of shape-controlled NCs allows for tuning the activity and selectivity of the reaction. This review analyzes the recent findings about shape-controlled NCs for the CO₂RR regarding their synthesis, shape-dependent selectivity, and how to twist their catalytic behavior and stability by compositional modifications. The importance of combining in situ and operando techniques that enable proper correlations between the structural and compositional changes of the catalyst under CO₂RR conditions, and the resulting product distribution is highlighted, aiming for a final transference to real application systems.

二氧化碳还原反应(CO ₂ RR)可以减少大气中的CO ₂并储存可再生能源获得的多余能量。_{然而，寻求合适的催化剂来降低电还原CO 2}所需的高过电势并提高对所需产物的选择性。通过合理的合成控制，可以获得具有一定形状的纳米晶体（NC），并将其转化为优先表面取向。考虑到CO ₂ RR的结构敏感性，使用形状控制的NC可以调节反应的活性和选择性。_{本综述分析了有关 CO 2} RR形状控制 NC 的最新研究结果，包括其合成、形状依赖性选择性以及如何通过成分修饰来扭转其催化行为和稳定性。强调了将原位技术和操作技术相结合的重要性，这些技术能够使 CO ₂ RR 条件下催化剂的结构和成分变化之间存在适当的相关性，并强调所得的产品分布，旨在最终转移到实际应用系统。