Amorphous Molybdenum Phosphide Nanoparticles for Electrocatalytic Hydrogen Evolution

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• 作者：Joshua M. McEnaney ; J. Chance Crompton ; Juan F. Callejas ; Eric J. Popczun ; Adam J. Biacchi ; Nathan S. Lewis ; Raymond E. Schaak
• 刊名：Chemistry of Materials
• 出版年：2014
• 出版时间：August 26, 2014
• 年：2014
• 卷：26
• 期：16
• 页码：4826-4831
• 全文大小：427K
• ISSN：1520-5002

文摘

Amorphous molybdenum phosphide (MoP) nanoparticles have been synthesized and characterized as electrocatalysts for the hydrogen-evolution reaction (HER) in 0.50 M H₂SO₄ (pH 0.3). Amorphous MoP nanoparticles (having diameters of 4.2 卤 0.5 nm) formed upon heating Mo(CO)₆ and trioctylphosphine in squalane at 320 掳C, and the nanoparticles remained amorphous after heating at 450 掳C in H₂(5%)/Ar(95%) to remove the surface ligands. At mass loadings of 1 mg cm^鈥?, MoP/Ti electrodes exhibited overpotentials of 鈭?0 and 鈭?05 mV (鈭?10 and 鈭?40 mV without iR correction) at current densities of 鈭?0 and 鈭?0 mA cm^鈥?, respectively. These HER overpotentials remained nearly constant over 500 cyclic voltammetric sweeps and 18 h of galvanostatic testing, indicating stability in acidic media under operating conditions. Amorphous MoP nanoparticles are therefore among the most active known molybdenum-based HER systems and are part of a growing family of active, acid-stable, non-noble-metal HER catalysts.