Pomegranate-like Ni-doped cobalt boride implanted in B,N-doped carbon nanocages for enhanced electrochemical oxygen evolution |
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Affiliation: | 1. Nigde Omer Halisdemir University, Prof. Dr. T. Nejat Veziroglu Clean Energy Research Center, Nigde, 51240, Türkiye;2. Nigde Omer Halisdemir University, Department of Energy Science and Technologies, 51240, Nigde, Türkiye;1. Centre for Advanced Materials, Qatar University, Doha, 2713, Qatar;2. Gas Processing Center (GPC), College of Engineering, Qatar University, 2713, Doha, Qatar;3. Global College of Engineering and Technology (GCET), P.O. Box 2546, CPO Ruwi 112, Sultanate of Oman |
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Abstract: | The development of efficient and stable transition metal boride electrocatalysts for oxygen evolution reaction (OER) is critical for energy conversion and environmental protection. Herein, we synthesized B, N-doped carbon layer encapsulated the Ni-doped CoxB nanocages electrocatalyst (denoted as Ni-CoxB@BNC) via a high-temperature boronizing, derived from Ni-doped cobalt-based zeolite imidazole frame (NiCo-ZIF), toward enhanced electrochemical alkaline oxygen evolution reaction. The Ni-CoxB@BNC electrocatalyst synthesized at 550 °C exhibits excellent OER activity with a low overpotential of 274 mV and a Tafel slope of 80 mV dec?1 at a current density of 10 mA cm?2, which is better than precious metal RuO2. The synergistic effect between B, N-doped carbon layer and Ni-doped CoxB in Ni-CoxB@BNC leads to higher OER catalytic activity. The B, N-doped carbon layer provides additional active sites, which accelerates charge transport and enhances the conductivity of Ni-CoxB@BNC during OER. In addition, it also protects the pomegranate seed-like Ni-CoxB nanoparticles inside, improving the stability of the Ni-CoxB@BNC material. This work unambiguously elucidates the design and preparation strategy of transition metal boride implanted B, N-doped carbon nanocage electrocatalysts derived from controlled bimetallic ZIF precursor. |
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Keywords: | NiCo-ZIF precursor Ni-doped boride B N-doped carbon layer Electrocatalyst Oxygen evolution reaction |
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