Enhanced catalytic activity in strained chemically exfoliated WS2 nanosheets for hydrogen evolution
Enhanced catalytic activity in strained chemically exfoliated WS2 nanosheets for hydrogen evolution
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DOI：
10.1038/nmat3700
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发表时间：
2013-09-01
期刊：
影响因子：
41.2
通讯作者：
Chhowalla, Manish
中科院分区：
文献类型：
--
作者：
Voiry, Damien;Yamaguchi, Hisato;Chhowalla, Manish
氢通过电催化在低过电位下的高效演化为清洁能源带来了巨大的希望。析氢可以很容易地通过电解在大电位下实现，这可以用昂贵的铂基催化剂降低。用廉价的、储量丰富的电催化剂替代铂将大大有利于清洁和高效的析氢。为此，使用具有高浓度金属边的2H（三角棱柱形）XS2（其中X = Mo或W）纳米颗粒已经报道了有希望的结果。XS2面临的主要挑战是增加活性位点的数量和催化活性。在这里，我们报道了化学剥落的单层纳米片WS2作为高效的析氢催化剂，具有非常低的过电位。分析表明，WS2电催化活性的增强与纳米薄片中高浓度的应变金属1T（八面体）相有关。我们的研究结果表明，化学剥落的WS2纳米片是一种有趣的析氢催化剂。
Efficient evolution of hydrogen through electrocatalysis at low overpotentials holds tremendous promise for clean energy. Hydrogen evolution can be easily achieved by electrolysis at large potentials that can be lowered with expensive platinum-based catalysts. Replacement of Pt with inexpensive, earth-abundant electrocatalysts would be significantly beneficial for clean and efficient hydrogen evolution. To this end, promising results have been reported using 2H (trigonal prismatic) XS2 (where X = Mo or W) nanoparticles with a high concentration of metallic edges. The key challenges for XS2 are increasing the number and catalytic activity of active sites. Here we report monolayered nanosheets of chemically exfoliated WS2 as efficient catalysts for hydrogen evolution with very low overpotentials. Analyses indicate that the enhanced electrocatalytic activity of WS2 is associated with the high concentration of the strained metallic 1T (octahedral) phase in the as-exfoliated nanosheets. Our results suggest that chemically exfoliated WS2 nanosheets are interesting catalysts for hydrogen evolution.