Electrochemically activated cobalt nickel sulfide for an efficient oxygen evolution reaction: partial amorphization and phase control
| Autor: | Ghulam Ali, Sungwook Mhin, Taeseup Song, Yu Rim Hong, Ho Jun Lee, Seong I. Moon, Kang Min Kim, Won-Sik Han, Seho Sun, Heechae Choi, Soumen Dutta, HyukSu Han, Yeon-Gil Jung, Kyung Yoon Chung |
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| Rok vydání: | 2019 |
| Předmět: |
chemistry.chemical_classification
Tafel equation Materials science Sulfide Renewable Energy Sustainability and the Environment Sulfidation 02 engineering and technology General Chemistry Overpotential 021001 nanoscience & nanotechnology Electrocatalyst Amorphous solid Catalysis Transition metal Chemical engineering chemistry General Materials Science 0210 nano-technology |
| Zdroj: | Journal of Materials Chemistry A. 7:3592-3602 |
| ISSN: | 2050-7496 2050-7488 |
| Popis: | It has recently been demonstrated that the OER activity of transition metal sulfides (TMSs) could be enhanced by the introduction of a thin amorphous layer on a pristine surface. We report here a novel strategy to enhance the OER by developing cobalt nickel sulfide (CoxNi1−xS2, CNS) with a high density of crystalline and amorphous phase boundaries. Electrochemical activation (ECA) can partially amorphize hollow CNS nanoparticles derived from surface-selective sulfidation. The ECA-treated CNS (ECA-CNS) electrocatalyst, which is comprised of CNS nanodots separated by thin amorphous layers, shows high densities of crystalline and amorphous phase boundaries. This catalyst shows superior OER catalytic performance with a current density of 10 mA cm−2 at a small overpotential of 290 mV, a low Tafel slope of 46 mV dec−1, a high mass activity of 217 A g−1, a high turnover frequency of 0.21 s−1 at an overpotential of 340 mV, and excellent stability in alkaline media. |
| Databáze: | OpenAIRE |
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