NiSe2 nanoparticles embedded in CNT networks: Scalable synthesis and superior electrocatalytic activity for the hydrogen evolution reaction |
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| Affiliation: | 1. School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300132, PR China;2. School of Materials Science and Engineering, Tianjin University, Tianjin 300072, PR China;3. Hebei Key Laboratory of Boron Nitride Micro and Nano Materials, Hebei University of Technology, Tianjin 300132, PR China;1. School of Materials Science and Engineering, Chang’an University, Xi’an, 710049, Shaanxi, China;2. State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University, Xi’an, 710049, Shaanxi, China;3. Department of Physics and Opt-electronic Engineering, Xi’an University of Arts and Science, Xi’an, 710065, Shaanxi, China;4. Engineering Research Center of Pavement Materials, Ministry of Education of PR China, Chang’an University, Xi’an, 710061, China;1. School of Chemistry and Chemical Engineering, Shaanxi Normal University, Xi’an 710119, China;2. Department of Chemistry, Renmin University of China, Beijing 100872, China;1. State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu 610054, PR China;2. School of Optoelectronic Engineering, Chongqing University of Posts and Telecommunications, Chongqing 400065, PR China |
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| Abstract: | For the first time, NiSe2 nanoparticles embedded in CNT networks have been synthesized via spray-drying followed by a selenization process. The NiSe2/CNTs hybrid (NCH) delivers superior electrocatalytic performance for HER. It has a low onset potential of ~ 159 mV and a cathode current density of 35.6 mA cm− 2 at − 250 mV vs RHE; more importantly, the Tafel slope has a very low value of 29 mV dec− 1, which is comparable to a platinum (Pt) catalyst; in addition, it is stable even after 1000 cycles. The superior HER performance of NCH is attributed to its unique structure, which is composed of ultrathin NiSe2 nanoparticles homogenously embedded in highly conductive and porous CNT networks. This not only provides abundant HER active sites, but also guarantees robust contact between the NiSe2 nanoparticles and the CNT networks. The present study provides new insights into the large-scale and low-cost synthesis of a highly effective and stable NiSe2-based electrocatalyst which could be extended to large-scale production of other non-precious metal hybrid catalysts with low cost, high efficiency and excellent stability. |
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