| 초록 |
To improve and maintain the oxygen evolution reaction (OER) performance of MnO2 in water electrolysis for a long time, this study attempts to utilize Ni(OH)2 nanosheets (ns), which have excellent electrochemical properties. Nanocomposites of MnO₂ and Ni(OH)2 were directly grown on a carbon paper (CP) electrode using hydrothermal synthesis. The MnO2-Ni(OH)2 composite electrode exhibited better OER performance than the nwMnO2@CP or nsNi(OH)2@CP electrodes. In particular, in a 1.0 M KOH alkaline electrolyte, the 1.0 nwMnO2-1.0 nsNi(OH)2@CP electrode showed the highest OER performance with a cell potential of 1.64 V and Tafel slope of 68 mV dec−1 at a 10 mA cm−2 of current density (η = 0.41 V). The stability of the 1.0 nwMnO2-1.0 nsNi(OH)2@CP electrode was demonstrated through 300 h-OER long-term tests. The synergy between nwMnO2 and nsNi(OH)2 accompanies a lattice oxygen participant adsorbate evolving mechanism.
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