Highly efficient electrocatalysts composed of earth‐abundant elements are desired for water‐splitting to produce clean and renewable chemical fuel. Herein, a heteroatomic‐doped multi‐phase Mo‐doped nickel phosphide/nickel sulfide (Mo‐NiPx/NiSy) nanowire electrocatalyst is designed by a successive phosphorization and sulfuration method for boosting overall water splitting (both oxygen and hydrogen evolution reactions (HER)) in alkaline solution. As expected, the Mo‐NiPx/NiSy electrode possesses low overpotentials both at low and high current densities in HER, while the Mo‐NiPx/NiSy heterostructure exhibits high active performance with ultra‐low overpotentials of 137, 182, and 250 mV at the current density of 10, 100, and 400 mA cm−2 in 1 m KOH solution, respectively, in oxygen evolution reaction. In particular, the as‐prepared Mo‐NiPx/NiSy electrodes exhibit remarkable full water splitting performance at both low and high current densities of 10, 100, and 400 mA cm−2 with 1.42, 1.70, and 2.36 V, respectively, which is comparable to commercial electrolysis.

As we know, in plasmonic-enhanced heterogeneous catalysis, the reaction rates could be remarkably accelerated by generating hot carriers in the constituent nanostructured metals. To further improve the reaction rate, well-defined heterostructures based on plasmonic gold nanoparticles on MXene Ti3C2T x nanosheets (Au NPs@Ti3C2T x ) were rationally designed and systematically investigated to improve the performance of the oxygen evolution reaction (OER). The results demonstrated that the catalysis performance of the Au NPs@Ti3C2T x system could be easily tuned by simply varying the concentration and size of Au NPs, and Au NPs@Ti3C2T x with an average Au NP diameter (∼10 nm) exhibited a 2.5-fold increase in the oxidation or reduction current compared with pure Ti3C2T x . The enhanced OER performance can be attributed to the synergistic effect of the plasmonic hot hole injection and Schottky junction carrier trapping. Owing to easy fabrication of Au NPs@Ti3C2T x , the tunable size and concentration of Au NPs loaded on MXene nanosheets, and the significantly enhanced OER, it is expected that this work can lay the foundation to the design of multidimensional MXene-based heterostructures for highly efficient OER performance.

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MXene‐based material has attracted wide attention due to its tunable band gap, high conductivity and impressive optical and plasmonic properties. Herein, a hetero‐nanostructured water splitting system was developed based on N‐doped Ti3C2 (N10TC) MXene and NiFe layered double hydroxide (LDH) nanosheets. The oxygen evolution reaction performance of the NiFe‐LDH significantly enhanced to approximately 8.8‐fold after incorporation of N10TC. Meanwhile, the Tafel slope was only 58.1 mV dec−1 with light irradiation, which is lower than pure NiFe‐LDH nanosheets (76.9 mV dec−1). All results manifested the vital role of the N10TC MXene induced plasmonic hot carriers via electrophoto‐excitation in enhancing the full water splitting performance of the as‐prepared system. This work is expected to provide a platform for designing various plasmonic MXenes‐based heterogeneous structures for highly efficient catalytic applications.

A CoMo2S4/Ni3S2 heterojunction is prepared with an overpotential of only 51 mV to drive a current density of 10 mA cm−2 in 1 M KOH solution and ∼100% of the potential remains in the ∼50 h chronopotentiometric curve at 10 mA cm−2.

SnO2‐based planar perovskite solar cells (PSCs) have attracted extensive attention owing to their simple structure and low‐temperature processing. However, the imperfect interface contact caused by surface defects and energy‐level mismatches greatly hinder the further improvement of the efficiency and stability of PSC. Herein, a multifunctional interfacial crosslinking agent D‐penicillamine (DPM) is introduced to improve the interface contact between SnO2 and upper perovskite. Through systematical analysis, it is found that the DPM used to modify SnO2 can simultaneously passivate the defects on the surface of SnO2 via esterification reaction, promote the charge extraction in perovskite by adjusting the interface energy‐level arrangement, and improve the quality of perovskite film by forming coordination bond with lead ions. These merits eventually assist DPM‐modified PSCs and achieve an impressive efficiency of 24.09%, whereas the controlled device only shows an efficiency of 22.44%. In addition, an unencapsulated DPM‐modified PSC exhibits better storage stability, thermal stability, and light stability than the controlled device, as well as in situ absorption capacity of leaked lead ions.

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A self-supported plasmon-enhanced CoNi@C–Au/TiO2 catalyst was fabricated and used for highly efficient electrocatalytic full water splitting.