磷化钴纳米棒作为一种高效电化学催化剂在析氢反应过程中的应用.docx

Cobalt phosphide nanorods as an efficient electrocatalyst for the hydrogen evolution reaction磷化钴纳米棒作为一种高效电化学催化剂在析氢反应过程中的应用ZhipengHuanga,n, Zhongzhong Chena, Zhibo Chena, CuncaiLva, Mark G. Humphreyb, Chi Zhanga,n摘要（Abstract）Cobalt phosphide (Co2P) nanorods are found to exhibit efficient catalytic activity for the hydrogen evolution reaction (HER), with the overpotential required for the current density of 20 mA/cm2 as small as 167 mV in acidic solution and 171 mV in basic solution. In addition, the Co2P nanorods can work stably in both acidic and basic solution during hydrogen production.This performance can be favorably compared to typical high efficient non-precious catalysts, and suggests the promising application potential of Co2P nanorods in the field of hydrogen production. The HER process follows aVolmer–Heyrovsky mechanism, and the rates of the discharge step and desorption step appear to be comparable during the HER process. The similarity of charged natures of Co and P in the Co2P nanorods to those of the hydride-acceptor and proton-acceptor in highly efficient Ni2P catalysts, [NiFe] hydrogenase, and its analogues implies that the HER catalytic activity of the Co2P nanorods might be correlated with the charged natures of Co and P. 2014 Elsevier Ltd. All rights reserved.磷化钴纳米棒（Co2P）被发现具有高效的催化性能在析氢反应过程（HER），该过程所需的过电位在20 mA/cm2电流密度的情况下，在酸性溶液中尽可能小于167mV以及在碱性溶液中尽可能小于171 mV。此外，电子纳米棒可以稳定工作在酸性和碱性溶液中在整个析氢过程。这种性能可媲美的典型的高效的非贵金属催化剂，并表明了Co2P纳米棒在产氢领域中的广阔应用前景。析氢反应过程遵循Volmer–Heyrovsky机制，并且放电步骤和解吸步骤的速率出现在析氢过程中具有可比性。Co2P纳米棒的Co和P的带电性质与高效Ni2P催化剂,[镍铁]氢化酶以及它的相似物的氢受体和质子受体类似，包括Co2P纳米棒的析氢催化过程都与Co和P的带电性质相关联。2014 Elsevier公司，保留所有权利相关。介绍（Introduction）The solar-driven splitting of water into molecular hydrogen and oxygen is one of the most promising possibilities forsimultaneously solving the global energy crisis and current environmental issues [1–3]. Because of the intrinsically slow hydrogen evolution reaction (HER) kinetics of semiconductors, photocathodes must be decorated with H