Graphdiyne as an Electron Modifier for Boosting Electrochemical Production of Adipic Acid
Fulai Liu, Xutao Gao, Rui Shi, Jinfan Xiong, Zhengxiao Guo, Edmund C. M. Tse, Yong Chen
Abstract
Abstract Adipic acid (AA) is a crucial feedstock for nylon polymers, and is industrially produced by thermal oxidation of cyclohexanone/cyclohexanol mixture (KA oil). However, this process consumes large quantities of corrosive nitric acid as oxidants, while emits ozone‐depleting greenhouse gas N 2 O. Here, an electrocatalytic strategy for selective oxidation of KA oil to AA coupled with H 2 evolution over a Co 3 O 4 /graphdiyne cooperative catalyst (Co 3 O 4 /GDY) is reported. The Co 3 O 4 /GDY displays high electrooxidation activity of KA oil to AA (100 mA cm −2 at ≈1.5 V vs RHE), outperforming all the reported findings. Detailed ex situ and in situ experimental studies, theoretical calculations, and molecular dynamic simulations reveal that GDY not only facilitates the enrichment of cyclohexanone on the catalyst surface in aqueous medium, but also upshifts the d ‐band center of Co sites, strengthening the adsorption/activation of cyclohexanone. This study offers a green route for AA synthesis and proposes a GDY interface engineering strategy for efficient electrooxidation.