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[Display omitted] • Mn doping strategy is proposed to enhance the HER activity of MoP for the first time. • Mn doping can optimize the electronic configuration of MoP. • Mn doped MoP is demonstrated as a highly efficient HER catalyst. • The 0.05Mn-MoP exhibits the best HER activity. Rational design of robust and highly efficient electrocatalysts for hydrogen evolution reaction (HER) is crucial for the development of energy conversion technologies. Molybdenum phosphide (MoP) has displayed excellent HER activities and triggered substantial interests as a promising water splitting electrocatalyst. In this work, a Mn doping strategy is proposed to improve the HER performances of MoP for the first time as well as the construction of novel porous interconnected structures. And the effect of doping contents and corresponding improvement mechanism are also discussed. It is found that the obtained 0.05Mn-MoP catalyst with porous interconnected nanosheets (NSs) presents the best HER properties as well as outstanding durability. The porous interconnected structures offer more exposed active sites, and the Mn doping optimizes the electronic configuration of MoP, leading to lower charge transfer resistance and higher intrinsic activity. This work provides a facile method to construct porous structures and demonstrate the effective strategy of Mn doping for the enhancement of MoP for the HER. [ABSTRACT FROM AUTHOR]

[Display omitted] • In-situ growth of p-type Ag 2 O on n-type Bi 2 O 2 S surface was achieved. • The heterostructure enhanced the activity of NIR light driven CO 2 photoreduction. • Intimate interfacial contact and heterostructure contributed to the charge transfer. • Ag 2 O/Bi 2 O 2 S exhibited an outstanding ability for adsorption and activation of CO 2. • The reaction mechanism was unveiled based on the experiments and DFT calculations. Photocatalytic converting CO 2 into organic carbon resources holds promise for achieving the utilization of CO 2 resources and the development of clean energy. However, the low utilization efficiency of solar energy and poor separation efficiency of photo-generated carriers limit the application of photocatalytic CO 2 reduction. Herein, Ag 2 O/Bi 2 O 2 S p-n heterojunction photocatalyst (xAO/BOS) was constructed by anchoring Ag 2 O on the surface of Bi 2 O 2 S through in-situ synthesis. The novel 27 %AO/BOS photocatalyst shows the enhanced photocatalytic CO 2 reduction performance with 14.49 μmol g−1 of CO yield and 12.06 μmol g−1 of CH 4 yield after 120 min of NIR light irradiation. The formed p-n heterojunction in 27 %AO/BOS photocatalyst by the in-situ synthesis contributes to facilitating the separation and transfer of photo-generated carriers and improving the adsorption and activation of CO 2. The composite still exhibits excellent photocatalytic cycling stability, and Ag0 species are produced in the photocatalytic CO 2 reduction reaction owing to the in-situ photoreduction of Ag 2 O. Based on the experimental analyses and theoretical calculations, the proposed mechanism for the improved photocatalytic CO 2 reduction activity over in-situ synthesis of 27 %AO/BOS p-n heterojunction photocatalyst is finally given. This work paves a promising way to construct effective NIR light-responsive photocatalysts for CO 2 photoreduction. [ABSTRACT FROM AUTHOR]