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首页> 美国卫生研究院文献>Chemical Science >Sub-1.1 nm ultrathin porous CoP nanosheets with dominant reactive {200} facets: a high mass activity and efficient electrocatalyst for the hydrogen evolution reaction
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Sub-1.1 nm ultrathin porous CoP nanosheets with dominant reactive {200} facets: a high mass activity and efficient electrocatalyst for the hydrogen evolution reaction

机译：具有主要反应性{200}面的亚1.1纳米超薄多孔CoP纳米片：高质量的活性和高效的氢析出电催化剂

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The exploration of a facile strategy to synthesize porous ultrathin nanosheets of non-layered materials, especially with exposed reactive facets, as highly efficient electrocatalysts for the hydrogen evolution reaction (HER), remains challenging. Herein we demonstrate a chemical transformation strategy to synthesize porous CoP ultrathin nanosheets with sub-1.1 nm thickness and exposed {200} facets via phosphidation of Co3O4 precursors. The resultant samples exhibit outstanding electrochemical HER performance: a low overpotential (only 56 and 131 mV are required for current densities of 10 and 100 mA cm–2, respectively), a small Tafel slope of 44 mV per decade, a good stability of over 20 h, and a high mass activity of 151 A g–1 at an overpotential of 100 mV. The latter is about 80 times higher than that of CoP nanoparticles. Experimental data and density functional theory calculations reveal that a high proportion of reactive {200} facets, high utilization efficiency of active sites, metallic nature, appropriate structural disorder, facile electron/mass transfer and rich active sites benefiting from the unique ultrathin and porous structure are the key factors for the greatly improved activity. Additionally, this facile chemical conversion strategy can be developed to a generalized method for preparing porous ultrathin nanosheets of CoSe2 and CoS that cannot be obtained using other methods.
机译：探索一种可行的策略来合成非层状材料的多孔超薄纳米片，尤其是具有暴露的反应面，作为氢析出反应（HER）的高效电催化剂，仍然具有挑战性。本文中，我们展示了一种化学转化策略，可通过Co3O4前体的磷酸化合成厚度小于1.1 nm的多孔CoP超薄纳米片，并暴露{200}面。所得样品具有出色的电化学HER性能：低电势（电流密度分别为10和100 mA cm –2 分别仅需要56和131 mV），小的Tafel斜率（每单位44 mV）十年，超过20小时的良好稳定性，在100 mV的超电势下具有151 A g –1 的高质量活性。后者是CoP纳米粒子的80倍左右。实验数据和密度泛函理论计算表明，得益于独特的超薄和多孔结构，高比例的反应性{200}面，活性位点的利用率高，金属性质，适当的结构无序，易实现的电子/质量转移和丰富的活性位点是大大改善活动的关键因素。此外，这种简便的化学转化策略可以发展为制备CoSe2和CoS多孔超薄纳米片的通用方法，而其他方法则无法获得。

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