Work

Enhanced electrocatalytic oxygen reduction to H₂O with high selectivity via 2D 1T-MoS₂ integrated with functionalized carbon nanohorns

Year: 2026

Type: article

Abstract: Developing cost-effective and high-performance electrocatalysts for the oxygen reduction reaction (ORR) is essential for advancing anion-exchange membrane fuel cell technologies. In this study, we report a robust heterostructure formed by covalently functionalized carbon nanohorns (CNH-N) integrated with metallic 1T-MoS 2 2D nanosheets. Through tailored diazonium chemistry, positively charged ammonium groups were introduced onto CNHs, enabling strong electrostatic and van der Waals interactions with negatively charged exfoliated MoS 2 . Structural and spectroscopic analyses confirm successful functionalization, enhanced defect modulation, and intimate CNH–MoS 2 coupling. The resulting CNH-N-MoS 2 catalyst exhibits remarkable ORR performance, including an optimized onset potential of 0.80 V, reduced charge-transfer resistance, and a dominant four-electron reduction pathway with ~94% selectivity toward H 2 O, which is comparable to commercial Pt/C. These results highlight how controlled chemical functionalization and heterointerface engineering can synergistically enhance catalytic activity and stabilize the 1T-MoS 2 phase. The CNH-N-MoS 2 heterostructures thus represent a promising class of platinum-group-metal-free/low-metal-content electrocatalysts for efficient fuel cell applications.

Source: npj 2D Materials and Applications

DOI: 10.1038/s41699-026-00752-8