Electrocatalytic and Photocatalytic Hydrogen Production from Acidic and Neutral-pH Aqueous Solutions Using Iron Phosphide Nanoparticles
Electrocatalytic and Photocatalytic Hydrogen Production from Acidic and Neutral-pH Aqueous Solutions Using Iron Phosphide Nanoparticles
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DOI：
10.1021/nn5048553
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发表时间：
2014-11-01
期刊：
影响因子：
17.1
通讯作者：
Schaak, Raymond E.
中科院分区：
文献类型：
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作者：
Callejas, Juan F.;McEnaney, Joshua M.;Schaak, Raymond E.
纳米结构的过渡金属磷化物最近已经成为地球上丰富的铂的替代品，用于催化析氢反应（HER），这是几种清洁能源技术的核心，因为它通过电化学还原水产生分子氢。铁基催化剂是非常有吸引力的目标，因为铁是最丰富和最便宜的过渡金属。我们在此报告，磷化铁（FeP），合成的纳米粒子具有均匀的，中空的形态，表现出最高的HER活性，迄今为止，在酸性和中性pH值的水溶液中。作为在-10 mA cm（-2）的电流密度下操作的电催化剂，以类似于1 mg cm（-2）的质量负载沉积在Ti基底上的FeP纳米颗粒在0.50 M H2SO 4中表现出-50 mV的过电位，在1.0 M磷酸盐缓冲盐水中表现出-102 mV的过电位。FeP纳米颗粒支持持续的氢生产，在恒电流控制下具有基本上定量的法拉第产率持续延长的时间段。在酸性和中性pH溶液中的紫外光照射下，沉积在TiO 2上的FeP纳米颗粒产生H-2的速率和量开始接近Pt/TiO 2。因此，FeP是用于有效地促进电催化和光催化HER的高地球丰度材料。
Nanostructured transition-metal phosphides have recently emerged as Earth-abundant alternatives to platinum for catalyzing the hydrogen-evolution reaction (HER), which is central to several clean energy technologies because it produces molecular hydrogen through the electrochemical reduction of water. Iron-based catalysts are very attractive targets because iron is the most abundant and least expensive transition metal. We report herein that iron phosphide (FeP), synthesized as nanoparticles having a uniform, hollow morphology, exhibits among the highest HER activities reported to date in both acidic and neutral-pH aqueous solutions. As an electrocatalyst operating at a current density of -10 mA cm(-2), FeP nanoparticles deposited at a mass loading of similar to 1 mg cm(-2) on Ti substrates exhibited overpotentials of -50 mV in 0.50 M H2SO4 and -102 mV in 1.0 M phosphate buffered saline. The FeP nanoparticles supported sustained hydrogen production with essentially quantitative faradaic yields for extended time periods under galvanostatic control. Under UV illumination in both acidic and neutral-pH solutions, FeP nanoparticles deposited on TiO2 produced H-2 at rates and amounts that begin to approach those of Pt/TiO2. FeP therefore is a highly Earth-abundant material for efficiently facilitating the HER both electrocatalytically and photocatalytically.