One-pot synthesis of diiron phosphide/nitrogen-doped graphene nanocomposite for effective hydrogen generation
One-pot synthesis of diiron phosphide/nitrogen-doped graphene nanocomposite for effective hydrogen generation
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一锅法合成磷化二铁/氮掺杂石墨烯纳米复合材料以有效产氢
DOI：
10.1016/j.nanoen.2015.01.027
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发表时间：
2015-03
期刊：
影响因子：
17.6
通讯作者：
Chi Zhang
中科院分区：
文献类型：
--
作者：
Zhipeng Huang;Cuncai Lv;Zhongzhong Chen;Zhibo Chen;Feng Tian;Chi Zhang
采用一锅法合成了磷化二铁（Fe 2 P）纳米粒子和氮掺杂石墨烯（NGr）纳米复合材料。这种纳米复合材料在酸性和碱性溶液中均表现出高效的析氢反应（HER）电催化活性。在酸性溶液中，电流密度为20 mA cm−2（η20）所需的最佳过电位为164 mV，这与最近报道的非贵金属电催化剂相当;而在碱性溶液中，η 20的值为376 mV。纳米Fe 2 P/NGr复合材料的HER活性与纳米Fe 2 P颗粒有关，NGr有利于电子从电极向催化剂的传递。Fe_2P/NGr纳米复合材料在HER中的法拉第效率在酸性和碱性溶液中均接近100%。通过恒电位电解和加速降解实验证明了Fe 2 P/NGr纳米复合材料在HER过程中的稳定性。Tafel斜率被确定为65 mV dec-1，这表明HER过程可能沿着Volmer-Heyrovsky机制进行沿着。Fe 2 P/NGr纳米复合材料的催化活性受合成温度的影响，这可能导致复合材料的相纯度、粒径和比表面积的差异。Fe 2 P纳米粒子中Fe和P的带电性质可能是Fe 2 P/NGr纳米复合材料HER活性的原因。
A nanocomposite comprising diiron phosphide (Fe2P) nanoparticles and nitrogen-doped graphene (NGr) was synthesized by a facile one-pot reaction. Such a nanocomposite showed efficient electrocatalytic activity in hydrogen evolution reaction (HER) in both acidic and basic solutions. The optimal overpotential required for the current density of 20 mA cm−2(η20) in acidic solution is 164 mV, which is favourably comparable to those of recently reported non-precious electrocatalysts; whereas in basic solution the value ofη20is 376 mV. The HER activity of Fe2P/NGr can be correlated to Fe2P nanoparticles in the nanocomposite, and NGr is beneficial to the electron transport from electrode to the catalyst. The faradaic efficiency of Fe2P/NGr nanocomposite in HER is nearly 100% in both acidic and basic solutions. The stability of Fe2P/NGr nanocomposite during HER has been demonstrated by potentiostatic electrolysis and accelerated degradation experiments. Tafel slope was determined to be 65 mV dec−1, which suggests that the HER processes might proceed along a Volmer–Heyrovsky mechanism. The catalytic activity of Fe2P/NGr nanocomposite is influenced by synthesis temperature, which may result in the differences in phase purity, particle size and specific surface areas of the composite material. The charged natures of Fe and P in Fe2P nanoparticle might be responsible for the HER activity of Fe2P/NGr nanocomposite.
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