Carbon-Nanotube-Incorporated Graphene Scroll-Sheet Conjoined Aerogels for Efficient Hydrogen Evolution Reaction,ACS Sustainable Chemistry & Engineering

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Carbon-Nanotube-Incorporated Graphene Scroll-Sheet Conjoined Aerogels for Efficient Hydrogen Evolution Reaction
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2017-07-14 00:00:00 , DOI: 10.1021/acssuschemeng.7b01181
Yiqin Shi ₁ , Wei Gao ₂ , Hengyi Lu ₂ , Yunpeng Huang ₂ , Lizeng Zuo ₂ , Wei Fan ₁ , Tianxi Liu _{1,

2}

Affiliation

Developing low-cost Pt-free hydrogen evolution reaction (HER) electrocatalyst is highly desired in exploiting hydrogen as a sustainable new energy carrier. Herein, hierarchically structured graphene-carbon nanotube aerogel-MoSe₂ hybrid (GCA-MoSe₂) was constructed as efficient HER electrocatalysts. GCA was facilely fabricated by direct freeze-drying of graphene oxide (GO)-carbon nanotube (CNT) hybrid dispersion, with subsequent carbonization. Through a shock cooling method, a unique scroll-sheet conjoined architecture could be formed in GCA, which can function as highly conductive skeleton, thus facilitating the transport of electrons through the whole hybrids. Furthermore, CNTs acting as “spacers” between graphene layers can efficiently impede their restacking, thus giving full play to the superior electrical conductivity of graphene. The hierarchical porous aerogel skeleton could allow full impregnation of electrolyte, accelerating the ion diffusion kinetics. Benefiting from the three-dimensional (3D) network of GCA, MoSe₂ nanosheets can grow densely and perpendicularly on the aerogel, preventing them from aggregation to maximize the number of catalytic active sites on the edges. The ensemble of these benefits makes the hybrid an efficient electrocatalyst for HER, which exhibits an onset potential of 113 mV, small Tafel slope of 68 mV decade^–1 and good stability. Such a simple method of immobilizing guest nanosheets/particles in the host of GCA opens a new avenue for manufacturing macroscopic electrode materials in large scale.

中文翻译：

碳纳米管结合的石墨烯涡旋结合气凝胶有效的氢气析出反应

在将氢用作可持续的新能源载体方面，迫切需要开发低成本的无Pt氢析出反应（HER）电催化剂。本文中，分层结构的石墨烯-碳纳米管气凝胶-MoSe ₂杂化物（GCA-MoSe ₂）被构造为有效的HER电催化剂。通过直接冷冻干燥氧化石墨烯（GO）-碳纳米管（CNT）杂化分散体，然后进行碳化，可以轻松制造GCA。通过冲击冷却方法，可以在GCA中形成独特的涡卷-连体结构，该结构可以充当高导电性骨架，从而促进电子在整个混合体中的传输。此外，充当石墨烯层之间“间隔物”的CNT可以有效地阻止其重新堆叠，从而充分发挥石墨烯的优越电导率。分层的多孔气凝胶骨架可以允许电解质的完全浸渍，从而加速离子扩散动力学。受益于GCA，MoSe ₂的三维（3D）网络纳米片可以在气凝胶上密集且垂直地生长，从而防止它们聚集以最大化边缘上的催化活性位点的数量。这些优点的结合使该杂化体成为HER的高效电催化剂，其展现的起始电位为113 mV，Tafel斜率较小，为10 ^m-1 – 68，并且具有良好的稳定性。这种将客体纳米片/颗粒固定在GCA主体中的简单方法为大规模生产宏观电极材料开辟了一条新途径。

更新日期：2017-07-15

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