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The development of efficient and low-cost transition-metal electrocatalysts is of great significance for hydrogen production from water splitting. Herein, we synthesized three-dimensional strawlike MoSe2-NiSe composed of microrods on nickel foam (NF) by a one-step hydrothermal reaction. The as-prepared MoSe2-NiSe/NF exhibited effective hydrogen evolution reaction (HER) activity (low overpotential of 79 mV at 10 mA cm–2and stability of 21 h in 1 M KOH), benefiting from the large electrochemically active area provided by strawlike structures, proper Se content, and synergistic effect of active phases. The enhanced oxygen evolution reaction (OER) activity (the low overpotential of 217 mV at 10 mA cm–2and maintaining stability for 47 h in 1 M KOH) was further observed for Fe-doped MoSe2-NiSe/NF (MoSe2-NiFeSe/NF) prepared by facile soaking, which can be mainly ascribed to optimized active phases formed on the OER process after Fe doping. The two-electrode system (MoSe2-NiSe/NF||MoSe2-NiFeSe/NF) requires a low cell voltage of 1.54 V to obtain a current density of 10 mA cm–2in 1 M KOH, which provides an interesting idea for constructing an effective overall water splitting system.

Combining super-resolution localization microscopy with pathology creates new opportunities for biomedical researches. This combination requires a suitable image mosaic method for generating a panoramic image from many overlapping super-resolution images. However, current image mosaic methods are not suitable for this purpose. Here we proposed a computational framework and developed an image mosaic method called NanoStitcher. We generated ground truth datasets and defined criteria to evaluate this computational framework. We used both simulated and experimental datasets to prove that NanoStitcher exhibits better performance than two representative image mosaic methods. This study is helpful for the mature of super-resolution digital pathology.

Byline: Lingyun. Guo, Jie. Mao, Yumin. Li, Zuoyi. Jiao, Jiwu. Guo, Junqiang. Zhang, Jun. Zhao Available evidence of the relationship between cholelithiasis, cholecystectomy, and risk of liver cancer and hence [...]

The technology of electrolytic water splitting to produce hydrogen is considered a promising method for renewable energy utilization. It is essential to develop bifunctional electrode materials with low cost and high activity. Herein, tremella-like MoS2-AB particles on nickel foam substrate were fabricated through a one-step Solvothermal reaction and exhibited excellent electrocatalytic performance for over-water electrolysis in alkaline media, i.e., overpotentials of 77 and 248 mV to achieve catalytic current density 10 mA cm−2for hydrogen evolution reaction and oxygen evolution reaction, respectively. Moreover, the two-electrode device demanded 1.51 V cell voltage to reach 10 mA cm−2and showed good stability of 12 h without iR compensation. This work may afford a new idea to design self-supported bifunctional electrocatalysts toward efficient overall water splitting reactions.

It is of great significance to design an efficient and low-cost oxygen evolution reaction (OER) electrocatalyst for water splitting to utilize hydrogen energy. In this work, three-dimensional flower-like bimetallic Ni–Fe selenide electrocatalysts were successfully fabricated on nickel foam by a facile one-step chemical bath method. Benefiting from the bimetal synergistic effect of Ni/Fe bimetal and a large electrochemically active surface area provided by the unique three-dimensional flower-like structure and improved conductivity of metal selenides, the as-prepared Ni0.2Fe0.8Se–Se/NF exhibits good OER activity, that is, a small overpotential of 200 mV at 10 mA cm–2, a low Tafel slope of 57.7 mV dec–1, and high stability of 26 h in 1.0 M KOH. The work may provide a new idea to fabricate other transition-metal-based catalysts for efficient water splitting.

Combining photocatalysis with the other physical-field is an efficient way to improve the performance of photocatalysis. The piezoelectric effect on the heterogeneous photocatalytic hydrogen production of SrTiO3(STO) nanoparticles was studied in this paper. It was found that the piezoelectric effect generated by the ultrasonic cavitation (sonophotocatalysis) had a profound influence on heterogeneous photocatalytic hydrogen production with or without sacrificial agents. Notably, the sonophotocatalytic hydrogen production of STO was related to the viscosity of sacrificial agents and the position of the ultrasonic vibrators. The mechanism of the performance changes by sonophotocatalysis was investigated by in-situ deposition Pt nanoparticles, which were found to aggregate obviously on STO nanoparticles' surface. Thus, ultrasonic cavitation would build a piezoelectric potential on the local surface of STO that would inhibit photo-generated carriers migrating to the surface.