The use of efficient and affordable non‐precious metal catalysts for hydrogen and oxygen evolution reactions is vital for replacing and widely implementing new energy sources. Nevertheless, improving the catalytic performance of these non‐precious‐metal bifunctional electrocatalysts continues to be a major challenge. In this article, an optimized Se‐incorporated bulk CoS2@MoS2 heterostructure grown on the surface of carbon nanotubes is reported. The resulting Se‐CoS2@MoS2/CNTs exhibit robust bifunctional electrocatalytic performance, with low overpotentials of 85 and 240 mV @ 10 mA·cm−2 for HER and OER, respectively. The materials exhibit superior long‐term stability of over 145 h, surpassing most electrocatalysts of similar type. This enhanced performance is attributed to the synergistic effect at the interface between the MoS2 and CoS2 phases, abundant active sites, and high active surface area, which collectively improves the electron‐transfer efficiency during the reaction process. Furthermore, the incorporation of the amorphous state of Se into the heterostructure yields a change in the crystallinity of the heterostructure in the electronic structure, which optimizes the adsorption and activation energy barriers of the catalytic intermediate. This study thus presents a promising approach to regulating anion doping in bifunctional electrocatalysts.

中文翻译：

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多壁碳纳米管上的 Se 掺杂 CoS2@MoS2 异质结构作为碱性整体水分解的高效双功能电催化剂


使用高效且经济实惠的非贵金属催化剂进行析氢和析氧反应对于替代和广泛实施新能源至关重要。然而，提高这些非贵金属双功能电催化剂的催化性能仍然是一个重大挑战。在本文中，报道了一种在碳纳米管表面生长的优化的 Se 掺入体CoS2@MoS2异质结构。所得的 Se-CoS2@MoS2/CNT 表现出强大的双功能电催化性能，HER 和 OER 的过电位分别为 85 和 240 mV @ 10 mA·cm-2。这些材料表现出超过 145 小时的优异长期稳定性，超过了大多数类似类型的电催化剂。这种增强的性能归因于 MoS2 和 CoS2 相之间界面的协同效应、丰富的活性位点和高活性表面积，它们共同提高了反应过程中的电子转移效率。此外，Se 的无定态掺入异质结构中会导致电子结构中异质结构的结晶度发生变化，从而优化了催化中间体的吸附和活化能势垒。因此，本研究提出了一种有前途的方法来调节双功能电催化剂中的阴离子掺杂。