Carbon material coating is an effective strategy to improve the stability of electrocatalysts for the hydrogen evolution reaction, but it remains a challenge to achieve for electrocatalysts with effective coatings while maintaining high activity. Here, a “hitting two birds with one stone” method was adopted to fabricate graphdiyne-wrapped CuS nanosheets on Ni foam. The CuS nanosheets not only worked as the main catalyst towards the hydrogen evolution reaction but also acted as the co-catalyst for the in situ growth of graphdiyne, which led to a strong interaction between graphdiyne and CuS. In turn, graphdiyne could enhance the catalytic activity and stability of the composite. The designed heterostructure GDY/CuS catalyst exhibited an excellent HER activity that only required 106 mV to attain the current density of 10 mA cm⁻² as well as an outstanding durability in an alkaline medium. It is believed that this study proposes a well-engineered heterostructure catalyst that possesses both a physically and electrochemically advantageous structure, which offers new insights in designing graphdiyne-coated electrocatalyst materials for various electrocatalytic applications.

中文翻译：

---

石墨二炔/ CuS异质结构的原位构建，可进行有效的氢气释放反应†

碳材料涂层是提高用于氢析出反应的电催化剂稳定性的有效策略，但要获得具有有效涂层并保持高活性的电催化剂，仍然是一项挑战。在这里，采用“用一只石头打两只鸟”的方法在镍泡沫上制造石墨二炔包裹的CuS纳米片。CuS纳米片不仅充当了析氢反应的主要催化剂，而且还充当了原位的助催化剂。石墨二炔的生长，导致石墨二炔与CuS之间有很强的相互作用。反过来，石墨二炔可以增强复合材料的催化活性和稳定性。设计的异质结构GDY / CuS催化剂表现出优异的HER活性，仅需要106mV即可达到10mA cm ^-2的电流密度，并且在碱性介质中具有优异的耐久性。可以相信，这项研究提出了一种精心设计的异结构催化剂，该催化剂同时具有物理和电化学上有利的结构，这为设计用于各种电催化应用的石墨二炔涂覆的电催化剂材料提供了新的见识。