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Partially oxidized cobalt species in nitrogen-doped carbon nanotubes: Enhanced catalytic performance to water-splitting |
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| Authors: | Tayyaba Najam Shumaila Ibraheem Muhammad Altaf Nazir Asma Shaheen Amir Waseem Muhammad Sufyan Javed Syed Shoaib Ahmad Shah Xingke Cai |
| Affiliation: | 1. Institute for Advanced Study, Shenzhen University, Shenzhen, 518060, PR China;2. College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen, 518060, China;3. Department of Chemistry, The Islamia University of Bahawalpur, Bahawalpur, 63100, Pakistan;4. Department of Earth Science, University of Sargodha, Sargodha, 40100, Pakistan;5. Department of Chemistry, Quaid-i-Azam University, Islamabad, Pakistan;6. School of Physical Science and Technology, Lanzhou University, Lanzhou, 730000, China;7. Hefei National Laboratory for Physical Sciences at the Microscale, CAS Key Laboratory of Soft Matter Chemistry, School of Chemistry and Materials Science, University of Science and Technology of China, Hefei, Anhui, 230026, PR China |
| Abstract: | It's still an ongoing research challenge to explore non-precious metal-based catalysts for substituting precious metal catalysts during full water electrocatalysis. Herein, we reported the partially oxidized cobalt species in nitrogen-doped carbon nanotubes hierarchical structures to produce dual-functionality towards oxygen/hydrogen evolution reactions. The in situ transformation of carbon nanotubes and well-exposed metal-oxide contributes to mass diffusion and greater electrolyte-accessible surface area. The as-synthesized catalyst displays low overpotentials of 287 mV and 171 mV for oxygen and hydrogen evolution reactions at 10 mA cm?2 of current density with remarkable performance during long-term stability. Furthermore, when employed as cathode and anode, a respectable performance of 1.68 V demonstrated our catalyst as an efficient bifunctional material for conducting water-splitting operation. |
| Keywords: | Nitrogen-doped carbon nanotubes Metal oxides Hydrogen evolution reaction Water-splitting |
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