Flower-shaped and sea urchin-shaped structures coexisting in cobalt-based phosphate and oxides achieve efficient electrochemical overall water electrolysis |
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Affiliation: | 1. School of Materials Science and Engineering, Changchun University of Science and Technology, Changchun, 130022, PR China;2. Key Laboratory of Applied Chemistry and Nanotechnology at Universities of Jilin Province, Changchun University of Science and Technology, Changchun 130022, PR China |
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Abstract: | Active site engineering for electrocatalysts is an essential strategy to improve their intrinsic electrocatalytic capability for practical applications and it is of great significance to develop a new excellent electrocatalyst for overall water splitting. Here, Co3O4/nickel foam (NF) and Co2(P4O12)/NF electrocatalysts with flower-shaped and sea urchin-shaped structures are synthesized by a simple hydrothermal process and followed by a post-treatment method. Among them, Co2(P4O12)/NF shows good catalytic activity for hydrogen evolution reaction (HER), and at the current density of 10 mA cm?2, the overpotential is only 113 mV Co3O4/NF exhibits good catalytic activity for oxygen evolution reaction (OER), and the overpotential is 327 mV at 20 mA cm?2. An alkaline electrolyzer with Co3O4/NF and Co2(P4O12)/NF catalysts respectively as anode and cathode displays a current density of 10 mA cm?2 at a cell voltage of 1.59 V. This work provides a simple way to prepare high efficient, low cost and rich in content promising electrocatalysts for overall water splitting. |
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Keywords: | Cobalt oxide Cobalt phosphate Hydrogen evolution reaction Oxygen evolution reaction |
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