Photoelectrochemical (PEC) CO₂ reduction integrates the merits of photocatalysis and electrolysis and represents an effective route to realize the solar-driven production of chemical fuels from CO₂ reduction. Over recent years, tremendous efforts have been devoted to the design and engineering of photocathodes so as to improve their PEC performances with many exciting progresses. Herein, we provide a review on the latest advances in this field. We first introduce the fundamental working principle, current challenges, and performance figures of merits of PEC CO₂ reduction. It is then followed by detailed discussion about a number of strategies for photocathode engineering aiming to promoting the three key reaction steps: light absorption, charge separation/transport, and surface catalytic reaction. Finally, we present a brief conclusion and perspective about possible future research directions of this field.

光电化学（PEC）CO ₂还原技术集光催化和电解的优点于一身，是实现太阳能驱动的CO ₂还原法生产化学燃料的有效途径。近年来，人们为光电阴极的设计和工程做出了巨大的努力，以通过许多令人振奋的进步来提高其PEC性能。在此，我们将对这一领域的最新进展进行回顾。我们首先介绍PEC CO ₂的基本工作原理，当前挑战和性能指标。减少。随后，将详细讨论光阴极工程的许多策略，这些策略旨在促进三个关键反应步骤：光吸收，电荷分离/传输和表面催化反应。最后，我们给出了该领域可能的未来研究方向的简要结论和观点。