Designing inexpensive yet active bifunctional electrocatalysts to directly split water is extremely desirable for the ever-broader applications of hydrogen energy. Herein, we present a cost-efficient multiphasic 1T/2H MoSe₂-on-MXene nanosheets heterostructure (denote as 1T/2H MoSe₂/MXene) as electrocatalyst for efficient overall water splitting. On one hand, the 1T/2H MoSe₂ possesses abundant active sites providing relatively high electrocatalytic activity. On the other hand, the MXene nanosheets serve as high-conductive 2D substrates capable of promoting charge transfer ability and preventing 1T/2H MoSe₂ from aggregation. Consequently, the 1T/2H MoSe₂/MXene catalyst in alkaline media exhibits remarkable synergy in both hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) activity having advantage over pure 1T/2H MoSe₂, MXene and 2H MoSe₂/MXene counterparts. To be specific, for HER performance, the 1T/2H MoSe₂/MXene reveals an overpotential (95 mV) and Tafel slope (91 mV dec⁻¹); for OER performance, the 1T/2H MoSe₂/MXene shows an overpotential (340 mV) and Tafel slope (90 mV dec⁻¹). Particularly, when 1T/2H MoSe₂/MXene serving as bifunctional electrocatalyst for overall water splitting, only 1.64 V is requested to attain a current density of 10 mA cm⁻². The 1T/2H MoSe₂/MXene heterostructure also exhibits good durability in overall water splitting system.

对于氢能的日益广泛的应用，设计廉价的但活性的双功能电催化剂以直接分解水是非常需要的。在这里，我们提出了一种具有成本效益的多相1T / 2H MoSe ₂ -on-MXene纳米片异质结构（表示为1T / 2H MoSe ₂ / MXene）作为有效整体水分解的电催化剂。一方面，1T / 2H MoSe ₂具有丰富的活性位点，提供相对较高的电催化活性。另一方面，MXene纳米片用作能够促进电荷转移能力并防止1T / 2H MoSe ₂聚集的高导电2D基板。因此，1T / 2H MoSe ₂碱性介质中的/ MXene催化剂在析氢反应（HER）和析氧反应（OER）活性方面均表现出显着的协同作用，具有优于纯1T / 2H MoSe ₂，MXene和2H MoSe ₂ / MXene对应物的优势。具体而言，就HER性能而言，1T / 2H MoSe ₂ / MXene表现出过电势（95 mV）和Tafel斜率（91 mV dec ^-1）。对于OER性能，1T / 2H MoSe ₂ / MXene表现出过电势（340 mV）和塔菲尔斜率（90 mV dec ^-1）。特别地，当1T / 2H MoSe ₂ / MXene用作用于整体水分解的双功能电催化剂时，仅需要1.64 V来实现10 mA cm ^-2的电流密度。。1T / 2H MoSe ₂ / MXene异质结构在整个水分解系统中也表现出良好的耐久性。