Atomically dispersed nickel-nitrogen-sulfur species anchored on porous carbon nanosheets for efficient water oxidation.

ABSTRACT: Developing low-cost electrocatalysts to replace precious Ir-based materials is key for oxygen evolution reaction (OER). Here, we report atomically dispersed nickel coordinated with nitrogen and sulfur species in porous carbon nanosheets as an electrocatalyst exhibiting excellent activity and durability for OER with a low overpotential of 1.51 V at 10 mA cm^-2 and a small Tafel slope of 45 mV dec^-1 in alkaline media. Such electrocatalyst represents the best among all reported transition metal- and/or heteroatom-doped carbon electrocatalysts and is even superior to benchmark Ir/C. Theoretical and experimental results demonstrate that the well-dispersed molecular S|NiN_x species act as active sites for catalyzing OER. The atomic structure of S|NiN_x ce

SUBMITTER: Hou Y 

PROVIDER: S-EPMC6437202 | biostudies-literature | 2019 Mar

REPOSITORIES: biostudies-literature