Molybdenum Sulfide/N-Doped CNT Forest Hybrid Catalysts for High-Performance Hydrogen Evolution Reaction
Molybdenum Sulfide/N-Doped CNT Forest Hybrid Catalysts for High-Performance Hydrogen Evolution Reaction
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DOI：
10.1021/nl404108a
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发表时间：
2014-03-01
期刊：
影响因子：
10.8
通讯作者：
Kim, Sang Ouk
中科院分区：
文献类型：
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作者：
Li, Dong Jun;Maiti, Uday Narayan;Kim, Sang Ouk
成本有效的氢进化反应（HER）催化剂不使用宝贵的金属元素是对环境良性能源产生的关键需求。硫化钼是出于这种目的的有前途的候选者之一，尤其是在酸性条件下，但其催化性能固有地受到稀疏催化边缘位点的限制和不良的电导率。我们报告合成及其对由硫化钼（MOSX）层组成的混合催化剂的催化，直接结合在垂直N掺杂的碳纳米管（NCNT）森林表面。由于N掺杂的石墨表面的高润湿性以及硫代氨基甲虫前体阴离子和N掺杂位点之间的静电吸引力，因此在低温湿化学过程下，在NCNT表面特别沉积了2 nm尺度厚的无定形无形MOSX层。来自无定形MOSX表面的致密催化位点和沿NCNT森林的流利电荷转运的协同作用，其催化性极佳，发作的催化性与75 mV相似，而10 mA/cm（2）电流密度的110 mV的小潜力小于110 mV ，这是她迄今为止报道的基于硫化钼的催化剂催化剂的最高活性。
Cost effective hydrogen evolution reaction (HER) catalyst without using precious metallic elements is a crucial demand for environment benign energy production. Molybdenum sulfide is one of the promising candidates for such purpose, particularly in acidic condition, but its catalytic performance is inherently limited by the sparse catalytic edge sites and poor electrical conductivity. We report synthesis and HER catalysis of hybrid catalysts composed of amorphous molybdenum sulfide (MoSx) layer directly bound at vertical N-doped carbon nanotube (NCNT) forest surface. Owing to the high wettability of N-doped graphitic surface and electrostatic attraction between thiomolybdate precursor anion and N-doped sites, similar to 2 nm scale thick amorphous MoSx layers are specifically deposited at NCNT surface under low-temperature wet chemical process. The synergistic effect from the dense catalytic sites at amorphous MoSx surface and fluent charge transport along NCNT forest attains the excellent HER catalysis with onset overpotential as low as similar to 75 mV and small potential of 110 mV for 10 mA/cm(2) current density, which is the highest HER activity of molybdenum sulfide-based catalyst ever reported thus far.