The synergistic effect of metallic molybdenum dioxide nanoparticle decorated graphene as an active electrocatalyst for an enhanced hydrogen evolution reaction
The synergistic effect of metallic molybdenum dioxide nanoparticle decorated graphene as an active electrocatalyst for an enhanced hydrogen evolution reaction
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DOI：
10.1039/c5ta00622h
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发表时间：
2015-03
影响因子：
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通讯作者：
Xiao Xie;Ling Lin;Ruirui Liu;Yi-Fan Jiang;Qing Zhu;A. Xu
中科院分区：
文献类型：
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作者：
Xiao Xie;Ling Lin;Ruirui Liu;Yi-Fan Jiang;Qing Zhu;A. Xu
作为一种耐用的可再生燃料，氢已经通过不同的途径吸引了全球对其生产的巨大兴趣。在这些方法中，电催化析氢反应（HER）是未来最有希望的低成本制氢方法之一。在这项工作中，开发了一种简单的氧化还原水热法来制备无贵金属的MoO2/rGO复合材料，用于高效的HER。氧化石墨烯纳米片为前驱体附着提供了含氧官能团，并且由于氧化石墨烯层间的空间约束效应，限制了小尺寸MoO2纳米颗粒的生长。得益于金属MoO2 NPs和石墨烯之间的协同效应，获得的MoO2/rGO复合材料具有优异的HER活性，其起始过电位为190 mV，阴极电流密度大，Tafel斜率为49 mV / 10年，而MoO2 NPs或rGO本身并不是非常有效的HER催化剂。此外，在酸性和碱性条件下，MoO2/rGO复合材料在1000个电位循环后都表现出良好的稳定性。由于MoO2纳米粒子的体积小、活性位点多、电导率高以及MoO2纳米粒子与石墨烯的协同作用，使得HER活性显著提高，稳定性优异。MoO2/rGO复合材料作为增强型活性HER催化剂的开发拓宽了mo基HER催化剂的成员，并为设计和合成其他无贵金属材料提供了见解，以实现经济高效且环保的电化学制氢催化剂。
As a durable and renewable fuel, hydrogen has attracted a huge amount of global interest in its production via different routes. Among these methods, the electrocatalytic hydrogen evolution reaction (HER) is one of the most promising ways for low-cost hydrogen production in the future. In this work, a simple redox hydrothermal method has been developed to fabricate a noble-metal-free MoO2/rGO composite for a highly efficient HER. GO nanosheets provide oxygen-containing functional groups for precursor attachment, and restrict growth of MoO2 nanoparticles (NPs) with a small size due to the space confinement effect among GO layers as well. Benefitting from a synergistic effect between metallic MoO2 NPs and graphene, the obtained MoO2/rGO composite exhibits excellent HER activity with a small onset overpotential of 190 mV, a large cathodic current density, and a small Tafel slope of 49 mV per decade, while MoO2 NPs or rGO itself is not a very efficient HER catalyst. Additionally, the MoO2/rGO composite displays good stability after 1000 potential cycles under both acidic and alkaline conditions. Dramatically improved HER activity and excellent stability are attributed to small size, more active sites, high conductivity and a synergistic effect of MoO2 NPs and graphene. The development of the MoO2/rGO composite as an enhanced active HER catalyst broadens the members of Mo-based HER catalysts and provides an insight into the design and synthesis of other noble-metal-free materials for the cost-effective and environmentally friendly catalyst in electrochemical hydrogen production.