Chemical oxygen demand-COD is essential for water pollution control and monitoring and is also used to validate wastewater treatment technologies. Conventional COD determination use of costly toxic inputs that do not align with Sustainable Development Goals 6. To address these environmental challenges, photocatalytic (PC)- and photoelectrocatalytic (PEC)-COD sensors have emerged as a solution. This comprehensive review examines PC-COD and PEC-COD sensors in terms of nanomaterials used and their properties, focusing on how multiple variables influence PC activity and sensor performance. Analytical principles and operational variables affecting performance in COD determination are discussed. Finally, a series of materials and conditions are proposed to improve the viability of PEC-COD sensors currently and in the future.

化学需氧量 - COD 对于水污染控制和监测至关重要，也用于验证废水处理技术。传统的 COD 测定使用不符合可持续发展目标的昂贵有毒投入 6.为了应对这些环境挑战，光催化 （PC） 和光电催化 （PEC） COD 传感器已成为一种解决方案。本综述从所用纳米材料及其特性的角度研究了 PC-COD 和 PEC-COD 传感器，重点介绍了多个变量如何影响 PC 活动和传感器性能。讨论了影响 COD 测定性能的分析原理和操作变量。最后，提出了一系列材料和条件，以提高 PEC-COD 传感器当前和未来的可行性。