Ultrafine Metal Nanoparticles/N‐Doped Porous Carbon Hybrids Coated on Carbon Fibers as Flexible and Binder‐Free Water Splitting Catalysts |
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| Authors: | Yongqi Zhang Xinhui Xia Xun Cao Bowei Zhang Nguyen Huy Tiep Haiyong He Shi Chen Yizhong Huang Hong Jin Fan |
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| Affiliation: | 1. School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore, Singapore;2. State Key Laboratory of Silicon Materials and Department of Materials Science and Engineering, Zhejiang University, Hangzhou, P. R. China;3. School of Materials Science and Engineering, Nanyang Technological University, Singapore, Singapore;4. Energy Research Institute@NTU, Interdisciplinary Graduate School, Nanyang Technological University, Singapore, Singapore |
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| Abstract: | By employing in situ reduction of metal precursor and metal‐assisted carbon etching process, this study achieves a series of ultrafine transition metal‐based nanoparticles (Ni–Fe, Ni–Mo) embedded in N‐doped carbon, which are found efficient catalysts for electrolytic water splitting. The as‐prepared hybrid materials demonstrate outstanding catalytic activities as non‐noble metal electrodes rendered by the synergistic effect of bimetal elements and N‐dopants, the improved electrical conductivity, and hydrophilism. Ni/Mo2C@N‐doped porous carbon (NiMo‐polyvinylpyrrolidone (PVP)) and NiFe@N‐doped carbon (NiFe‐PVP) produce low overpotentials of 130 and 297 mV at a current density of 10 mA cm?2 as catalysts for hydrogen evolution reaction and oxygen evolution reaction, respectively. In addition, these binder‐free electrodes show long‐term stability. Overall water splitting is also demonstrated based on the couple of NiMo‐PVP||NiFe‐PVP catalyzer. This represents a simple and effective synthesis method toward a new type of nanometal–carbon hybrid electrodes. |
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| Keywords: | bifunctional electrocatalysts hydrogen evolution reaction metal particles in carbon oxygen evolution reaction water splitting |
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