Metal-organic Framework-driven Porous Cobalt Disulfide Nanoparticles Fabricated by Gaseous Sulfurization as Bifunctional Electrocatalysts for Overall Water Splitting.

ABSTRACT: Both high activity and mass production potential are important for bifunctional electrocatalysts for overall water splitting. Catalytic activity enhancement was demonstrated through the formation of CoS₂ nanoparticles with mono-phase and extremely porous structures. To fabricate porous structures at the nanometer scale, Co-based metal-organic frameworks (MOFs), namely a cobalt Prussian blue analogue (Co-PBA, Co₃[Co(CN)₆]₂), was used as a porous template for the CoS₂. Then, controlled sulfurization annealing converted the Co-PBA to mono-phase CoS₂ nanoparticles with ~ 4?nm pores, resulting in a large surface area of 915.6?m²?g^-1. The electrocatalysts had high activity for overall water splitting, and the overpotentials of the oxygen evolution reaction and hydrogen evolution reaction under the operating conditions were 298?mV and -196 mV, respectively, at 10?mA?cm^-2.

SUBMITTER: Ahn IK 

PROVIDER: S-EPMC6925291 | biostudies-literature | 2019 Dec

REPOSITORIES: biostudies-literature