三维氮掺杂石墨烯/碳纳米棒复合载体与钴纳米颗粒协同催化高选择性合成过氧化氢

o address the low selectivity of graphene materials in the two-electron oxygen reduction reaction (ORR) for hydrogen peroxide (H2O2) production, a three-dimensional nitrogen-doped graphene/carbon nanorod-supported Co nanoparticle composite (3D Co@N-CNR/G) was developed. By optimizing the Co loading amount and chemical vapor deposition (CVD) process parameters, and verifying through characterization techniques including SEM, Raman spectroscopy, and XRD, the vertical growth of CNR on the graphene surface was achieved, thereby constructing a 3D composite structure. This architecture effectively mitigated interlayer stacking of graphene under high-temperature conditions. Electrochemical tests in alkaline media demonstrated that the 3D Co@N-CNR/G exhibited enhanced H2O2 selectivity ranging from 76% to 92%. Combined with XPS analysis, the 3D structure formed by CNR growth on graphene was shown to effectively modulate the catalytic activity of Co metal centers and significantly increase the exposure ratio of active Co-N coordination sites, thereby facilitating H2O2 generation.