NiS/Ni2P/CC杂化材料的制备及其电解水性能的研究
首发时间:2019-03-06
摘要:电解水是一种能高效分解水制得氢气和氧气的方法,而发展一种经济、高效和稳定的催化剂来代替贵金属电极是电解水大规模工业化的重要一步。本文以碳布为基底材料,通过水热法和化学气相沉积法(磷化和硫化)在碳布纤维上负载杂化材料NiS/Ni2P。研究发现制得的NiS/Ni2P/CC杂化材料同时展现出良好的电解水析氢和析氧性能,该催化剂在析氢反应电流密度为10mA cm-2时的过电位以及Tafel斜率分别低至91mV和103.9 mV -1,且具备优异的电化学稳定性。磷化和硫化过程形成大量的缺陷点和边缘活性位点,以及NiS和Ni2P结合使得电荷重新分布,形成Ni活性位点,均是NiS/Ni2P/CC杂化材料电解水催化活性提升的主要因素。
关键词: 电解水 析氢 析氧 碳布 NiS/Ni2P/CC
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The synthesis of NiS/Ni2P/CC hybrids and the performance of water electrolysis
Abstract:Electrolysis of water is a high-efficiency method to obtain hydrogen and oxygen by splitting water. The development of economical, proficient, and highly stable catalysts to substitute the expensive noble metal electrodes for large-scale applications of electrocatalytic water-splitting is an important factor. In this context, we obtained NiS/Ni2P hybrid anchored on carbon cloth fibers through hydrothermal method and chemical vapor deposition method. The as-obtained NiS/Ni2P/CC hybrid material showed excellent electrocatalytic activity both in hydrogen evolution reaction(HER) and oxygen evolution reaction(OER). The overpotential of this catalyst is only 91 mV in HER, and the slope of Tafel is approximately 103.9 mV dec-1. The catalyst also exhibited excellent electrochemical stability. The formation of large defects and edge active sites after the phosphorization and sulfurization processes, as well as the charge redistribution in the NiS/Ni2P hybrid forming Ni sites, were both the major factors of enhanced electrocatalytic activity of NiS/Ni2P/CC hybrid.
Keywords: water electrolysis hydrogen evolution reaction oxygen evolution reaction carbon cloth NiS/Ni2P/CC
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