Abstract MoS2 has been widely used as a hydrogen evolution reaction (HER) electrocatalyst because of its unique characteristics, such as a tunable band gap, near-zero Gibbs free energy, and earth abundance. However, its low electrical conductivity and the electrochemically inert basal plane of MoS2 decrease the HER performance. Herein, we used graphene and carbon cloth (CC) to boost the electrocatalytic activity of MoS2. Using nickel electrodeposition and chemical vapor deposition (CVD) at high temperature, graphene was grown on carbon cloth (Gr/CC) and a sea-grape-like morphology was formed simultaneously. Finally, Gr/CC was covered up with MoS2 using two-zone CVD (MoS2/Gr/CC), resulting in a three-dimensional (3D) sea-grape-like heterostructure. The MoS2/Gr/CC exhibits outstanding HER performance, with a suitable onset potential (50 mV), low ŋ10 (91 mV, overpotential at 10 mA cm−2), high electrical double layer capacitance (Cdl; 239 mF cm−2), low Tafel slope value (48 mV dec−1), and high stability in 0.5 M H2SO4 for two days at various overpotentials. The 3D sea-grape-like morphology and the synergistic effect of MoS2 and graphene led to the enhanced electrocatalytic activity of MoS2/Gr/CC, indicating much better HER performance than most electrocatalysts based on graphene and MoS2.

中文翻译：

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碳布上3D海葡萄状MoS2/石墨烯的异质结构增强水分解

摘要 MoS2 因其独特的特性，如带隙可调、吉布斯自由能接近于零和地球丰度，被广泛用作析氢反应（HER）电催化剂。然而，其低电导率和 MoS2 的电化学惰性基面降低了 HER 性能。在这里，我们使用石墨烯和碳布（CC）来提高 MoS2 的电催化活性。在高温下使用镍电沉积和化学气相沉积 (CVD)，在碳布 (Gr/CC) 上生长石墨烯，同时形成海葡萄状形态。最后，使用两区 CVD (MoS2/Gr/CC) 用 MoS2 覆盖 Gr/CC，产生三维 (3D) 海葡萄状异质结构。MoS2/Gr/CC 表现出出色的 HER 性能，具有合适的起始电位（50 mV），低 ŋ10（91 mV，10 mA cm-2 处的过电位），高双电层电容（Cdl；239 mF cm-2），低 Tafel 斜率值（48 mV dec-1），以及在 0.5 M H2SO4 中的高稳定性在各种过电位下两天。3D 海葡萄状形态以及 MoS2 和石墨烯的协同效应导致 MoS2/Gr/CC 的电催化活性增强，表明其 HER 性能比大多数基于石墨烯和 MoS2 的电催化剂要好得多。