The development of hydrogen evolution catalysts based on nonprecious metals is essential for the practical application of water‐splitting devices. Herein, the synthesis of Co₉S₈−MoS₂ hierarchical nanoboxes (HNBs) as efficient catalysts for the hydrogen evolution reaction (HER) is reported. The surface of the hollow cubic structure was organized by CoMoS₄ nanosheets formed through the reaction of MoS₄²⁻ and Co²⁺ released from the cobalt zeolite imidazole framework (ZIF‐67) templates under reflux in a mixture of water/ethanol. The formation process for the CoMoS₄ HNB structures was characterized by TEM images recorded at various reaction temperatures. The amorphous CoMoS₄ HNBs were converted through sequential heat treatments into CoS_x−MoS₂ and Co₉S₈−MoS₂ HNBs. Owing to their unique chemical compositions and structural features, Co₉S₈−MoS₂ HNBs have a high specific surface area (124.6 m² g⁻¹) and superior electrocatalytic performances for the HER. The Co₉S₈−MoS₂ HNBs exhibit a low overpotential (η₁₀) of 106 mV, a low Tafel slope of 51.8 mV dec⁻¹, and long‐term stability in an acidic medium. The electrocatalytic activity of Co₉S₈−MoS₂ HNBs is superior to that of recently reported values, and these HNBs prove to be promising candidates for the HER.

中文翻译：

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Co9S8-MoS2纳米片构成的分层纳米盒，作为氢释放反应的高效电催化剂

基于非贵金属的析氢催化剂的开发对于水分解装置的实际应用至关重要。在此，报道了作为氢析出反应（HER）的有效催化剂的Co ₉ S ₈ -MoS ₂分级纳米盒（HNBs）的合成。空心立方结构的表面由CoMoS ₄纳米片组织而成，该纳米片是由钴沸石咪唑骨架（ZIF-67）模板释放的MoS ₄ ^2-和Co ²⁺在水/乙醇混合物中回流形成的。CoMoS ₄的形成过程通过在不同反应温度下记录的TEM图像表征HNB结构。通过顺序热处理将无定形CoMoS ₄ HNB转变为CoS _x -MoS ₂和Co ₉ S ₈ -MoS ₂ HNB。由于其独特的化学组成和结构特征，Co ₉ S ₈ -MoS ₂ HNB具有较高的比表面积（124.6 m ²  g ^-1）和HER优异的电催化性能。共同₉ š _8个-MoS _2周的HNB表现出低的超电势（η ₁₀）为106 mV，低Tafel斜率为51.8 mV dec ^-1，并且在酸性介质中具有长期稳定性。Co ₉ S ₈ -MoS ₂ HNB的电催化活性优于最近报道的值，这些HNB被证明是HER的有希望的候选者。