Corrigendum to ' Efficient electrocatalytic reduction of N2 to ammonia at ambient conditions with municipal sludge-derived porous carbon codoped with multiple heteroatoms' [Electrochimica Acta 408 (2022) 139934]. (10th February 2023) - Deng, Lifang; Wang, Lufeng; Wei, Guoqiang; Yuan, Haoran; Xie, Jun; Chen, Yong