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Main group Bi‐based materials have gained popularity as N2 reduction reaction (NRR) photo/electrocatalysts due to their ability to inhibit competitive H2 evolution reactions (HER) and the unique N2 adsorption activities. The introduction of defects in Bi‐based catalysts represents a highly effective strategy for enhancing light absorption, promoting efficient separation of photogenerated carriers, optimizing the activity of free radicals, regulating electronic structure, and improving catalytic performance. In this review, we outline the various applications of state of the defect engineering in Bi‐based catalysts and elucidate the impact of vacancies on NRR performance. In particular, the types of defects, methods of defects tailoring, advanced characterization techniques, as well as the Bi‐based catalysts with abundant defects and their corresponding catalytic behavior in NRR were elucidated in detail. Finally, the main challenges and opportunities for future development of defective Bi‐based NRR catalysts are discussed, which provides a comprehensive theoretical guidance for this field. [ABSTRACT FROM AUTHOR]

The 1.43" hybrid wearable AMOLED display (HWAD) had been developed based on low‐temperature polycrystalline silicon (LTPS) and thin‐film encapsulation (TFE) techniques, which was integrated touch and display functionalities with one driver IC. The 1.43" HWAD border was similar to flexible products, but less than rigid ones above 20%. Meanwhile, the ultra‐thin stack‐up module thickness was also close to that of flexible ones, but reduced about 31.4% compared to traditional rigid display. HWAD utilized a new pixel compensation circuit and a novel compensation algorithm, eventually achieved a flicker indicator FMA value of <3% in 5Hz AOD mode. The logic power consumption of the smart watch in 5Hz AOD model is reduced about 35% compared with the one in 30Hz. The novel HWAD aggregated the advantages of flexible and rigid displays with low process costs. The novel high‐performance HWAD had significant market application prospect. [ABSTRACT FROM AUTHOR]

A graph is called Q-integral if its signless Laplacian spectrum consists of integers. In this paper, we characterize a class of k-cyclic graphs whose second smallest signless Laplacian eigenvalue is less than one. Using this result we determine all the Q-integral unicyclic, bicyclic and tricyclic graphs. [ABSTRACT FROM AUTHOR]

In this study, a series of PbS polyhedra were synthesized through hydrothermal decomposition of the as-formed lead diethyldithiocarbamate (Pb-DDTC) single-source precursor in its precursor solution. Through extensive experiments, it was concluded that the amount of poly-(vinylpyrrolidone) (PVP), DDTC and the reaction time had major effects on the shapes of the as-synthesized PbS crystals. Sub-micro sized cuboctahedrons and cubes were selectively obtained by manipulating the concentration of PVP and the reaction time. Possible growth mechanism for the shape controlled synthesis of PbS crystals was briefly discussed. [ABSTRACT FROM AUTHOR]