The recycling of carbon dioxide via its electroreduction (CO₂RR) is a key factor to stimulate the capture of this greenhouse gas, being a promising green strategy for achieving sustainable development. Nanostructured carbon materials play a protagonist role in the search of efficient and selective CO₂RR electrocatalysts and, at the same time, pyrolysis is one of the most versatile tools to produce tailored nanocarbons. Nanocarbons involving a variety of dopants, metal single-atom sites/nanoparticles and textural/structural arrangements can be obtained through rational precursor/s selection and control of the carbonization conditions. Thus, this review aims to highlight the advances in CO₂RR electrocatalysis using nanocarbons derived from MOFs, biomass, polymers, and other precursors, assessing the aspects to improve as well. Bearing in mind that selectivity toward valuable products is the ever-present obstacle, we summarize the nature and proportion of the produced compounds. With this, we provide a useful guide in which carbon synthetic conditions, structural features and electrocatalytic metrics are correlated to facilitate further progress in this boisterous field. After all, the main limitations detected in CO₂RR research as well as potential approaches to address them are included.

通过电还原法（CO ₂ RR）回收二氧化碳是刺激捕获这种温室气体的关键因素，是实现可持续发展的有前途的绿色战略。纳米结构碳材料在寻找有效和选择性的CO ₂ RR电催化剂中起着主角的作用，同时，热解是生产定制纳米碳的最通用的工具之一。可以通过合理的前驱体选择和控制碳化条件来获得涉及多种掺杂剂，金属单原子位点/纳米粒子以及结构/结构排列的纳米碳。因此，本次审查旨在强调CO ₂的进展。使用衍生自MOF，生物量，聚合物和其他前体的纳米碳进行RR电催化，同时评估需要改进的方面。牢记对有价值产品的选择性是一直存在的障碍，我们总结了所生产化合物的性质和比例。以此为基础，我们提供了有用的指南，其中将碳合成条件，结构特征和电催化指标相关联，以促进在这个水热领域中的进一步发展。毕竟，其中包括在CO ₂ RR研究中发现的主要局限性以及解决这些局限性的潜在方法。