MoS₂ exhibits good prospects in electrocatalytic hydrogen evolution. Whereas, the electrocatalytic property of MoS₂ is restrained by its insufficient active sites, low electrical conductivity, and slow water dissociation processes. Herein, an aerogel composed of silicon carbide (SiC) and graphene (SiCnw–RGO) was constructed by growing SiC nanowires (SiCnw) in the graphene aerogel (RGO) via the CVD method, and then Ni–Mo–S nanosheets were hydrothermally synthesized on the SiCnw–RGO composite aerogel to develop an efficient pH-universal electrocatalyst. Ni–Mo–S nanosheets supported on SiCnw–RGO (Ni–Mo–S@SiCnw–RGO) exhibit an interesting hierarchical three-dimensional interconnected structure of composite aerogel. The optimal Ni–Mo–S@SiCnw–RGO electrocatalyst exhibits excellent catalytic performance with low Tafel slopes of 60 mV/dec under acidic conditions and 90 mV/dec under alkaline conditions. Density functional theory calculations demonstrate a composite catalyst exhibits advantageous hydrogen adsorption free energy and water dissociation energy barrier. This study provides a reference to design an efficient hierarchical aerogel electrocatalyst.

中文翻译：

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分层 SiC-石墨烯复合气凝胶负载的 Ni-Mo-S 纳米片用于高效 pH-通用电催化析氢

MoS ₂在电催化析氢方面具有良好的应用前景。_{MoS 2}的电催化性能活性位点不足、电导率低和水离解过程缓慢等因素限制了其活性。在此，通过CVD方法在石墨烯气凝胶（RGO）中生长SiC纳米线（SiCnw）构建了由碳化硅（SiC）和石墨烯（SiCnw-RGO）组成的气凝胶，然后水热合成了Ni-Mo-S纳米片在 SiCnw-RGO 复合气凝胶上开发一种高效的 p​​H 通用电催化剂。负载在 SiCnw-RGO 上的 Ni-Mo-S 纳米片（Ni-Mo-S@SiCnw-RGO）表现出有趣的复合气凝胶分层三维互连结构。最佳的 Ni-Mo-S@SiCnw-RGO 电催化剂表现出优异的催化性能，在酸性条件下 Tafel 斜率为 60 mV/dec，在碱性条件下为 90 mV/dec。密度泛函理论计算表明复合催化剂表现出有利的氢吸附自由能和水解离能垒。该研究为设计高效的多级气凝胶电催化剂提供了参考。