Chemistry - A European Journal
Chemistry - A European Journal
5 years ago

One-Step Fabrication of Monolithic Electrodes Comprising Co9S8 Particles Supported on Cobalt Foam for Efficient and Durable Oxygen Evolution Reaction

One-Step Fabrication of Monolithic Electrodes Comprising Co9S8 Particles Supported on Cobalt Foam for Efficient and Durable Oxygen Evolution Reaction
Xiuli Fu, Qingqing Zhang, Lifeng Liu, Wei Li, Dehua Xiong, Sitaramanjaneya Mouli Thalluri, Junyuan Xu
A very easy and cost-effective approach to the fabrication of monolithic Co9S8 water oxidation electrodes (Co@Co9S8), fabricated by one-step hydrothermal treatment of commercially available cobalt foam in the presence of thiourea, is reported. The morphology, crystal structure, microstructure, and composition of as-fabricated Co@Co9S8 electrodes were examined by using scanning electron microscopy (SEM), powder X-ray diffractometry (XRD), transmission electron microscope (TEM), and X-ray photoelectron spectroscopy (XPS), and their electrochemical properties were investigated by cyclic voltammetry (CV), chronopotentiometry (CP), chronoamperometry (CA), and electrochemical impedance spectroscopy (EIS). When used to catalyze the oxygen evolution reaction (OER) in alkaline solution, the Co@Co9S8 electrode with an optimal Co9S8 loading exhibits outstanding catalytic activity, requiring a low overpotential of 350 mV to deliver an anodic current density of 10 mA cm−2 and showing fast kinetics for OER with a small Tafel slope (55 mV dec−1) and charge-transfer resistance (0.44 Ω cm−2), which outperforms many sulfide-based OER catalysts and some state-of-the-art noble metal catalysts recently reported in the literature. Importantly, the electrodes show excellent long-term stability, and are capable of operating at both a low current density and a high current density relevant to industrial water electrolysis up to 100 hours. All OER the place: One-step hydrothermal treatment of commercially available cobalt foam is reported for the fabrication of monolithic Co9S8 water-splitting electrodes (Co@Co9S8). When used to catalyze the oxygen evolution reaction (OER), the Co@Co9S8 electrode exhibits outstanding catalytic activity and excellent long-term stability in alkaline solution, outperforming many sulfide-based OER catalysts reported in the literature.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/chem.201701391

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