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2023年7月嘲风作品集（二）

已有 868 次阅读 2023-9-28 10:54 |个人分类:作品发表|系统分类:论文交流

▲ Vol 19 Issue 29 | 19 July , 2023

Spinning Liquid Metal Droplets on Ice

Xi Zhao, Sicong Tan, Chenglin Zhang, Yuchen Yao, Jing Liu

Spin Droplets
In article number 2300158, Jing Liu and co-workers report the phenomenon of liquid metal droplet spin on ice induced by a spontaneous dual solid-liquid phase transition, just like dancing on ice. The droplet motion is lubricated by a thin water film and driven by the escaping bubbles as the ice melts. Such spin effect is disclosed to be universal for different objects including liquid metal droplets and solid balls.

https://onlinelibrary.wiley.com/doi/10.1002/smll.202370215

▲ Vol 10 Issue 07 | 19 July , 2023

Preparation of High Damage Threshold Device Based on Bi2Se3 Film and Its Application in Fiber Lasers（图1）

Xiaowei Xing, Yuxiang Liu, Junfeng Han, Wenjun Liu, and Zhiyi Wei

As a handicap for passive mode-locked lasers to operate stably for a long time, the undesirable damage threshold of saturable absorption devices means that it is difficult to maintain a normal operation state under the irradiation brought by ultrashort pulses. To reduce the damage probability when the saturable absorption devices interact with an ultrafast laser, some technologies have been developed to resist the high-energy irradiation of an ultrafast laser that will also increase the difficulty of laser construction at the same time. In this paper we put forward a new research idea to improve the low-damage threshold problem: optimizing the optical transmittance, which will avoid dissociation due to excessive heat accumulation. Using the melt and machine exfoliation method, the high optical transmittance (>95%) saturable absorption devices based on Bi2Se3 are prepared, whose damage threshold (2.45 mJ/cm2) is nearly 5 times higher than commercial SESAM. The devices applied to generate femtosecond pulses exhibit exciting nonlinear optical effects, which enable the mode-locked fiber laser to operate with a pulse duration of 195 fs and a signal-to-noise ratio of 81.73 dB. This discovery not only proves that the passive mode-locked laser-based high transmittance Bi2Se3 can obtain reliable pulse output, but also provides a new perspective for the selection of saturable absorption materials in the future.

https://pubs.acs.org/doi/10.1021/acsphotonics.2c01375

▲ Vol 06 Issue 04 | 23 July , 2023

3D Grid of Carbon Tubes with Mn3O4-NPs/CNTs Filled in their Inner Cavity as Ultrahigh-Rate and Stable Lithium Anode

Shiping Zhang, Fangming Han, Qijun Pan, Dou Lin, Xiaoguang Zhu, Cheng Shao, Gaixia Zhang, Zhaoming Wang, Shuhui Sun, Guowen Meng

Transition metal oxides are regarded as promising candidates of anode for next-generation lithium-ion batteries (LIBs) due to their ultrahigh theoretical capacity and low cost, but are restricted by their low conductivity and large volume expansion during Li+ intercalation. Herein, we designed and constructed a structurally integrated 3D carbon tube (3D-CT) grid film with Mn3O4 nanoparticles (Mn3O4-NPs) and carbon nanotubes (CNTs) filled in the inner cavity of CTs (denoted as Mn3O4-NPs/CNTs@3D-CT) as high-performance free-standing anode for LIBs. The Mn3O4-NPs/CNTs@3D-CT grid with Mn3O4-NPs filled in the inner cavity of 3D-CT not only afford sufficient space to overcome the damage caused by the volume expansion of Mn3O4-NPs during charge and discharge processes, but also achieves highly efficient channels for the fast transport of both electrons and Li+ during cycling, thus offering outstanding electrochemical performance (865 mAh g−1 at 1 A g−1 after 300 cycles) and excellent rate capability (418 mAh g−1 at 4 A g−1) based on the total mass of electrode. The unique 3D-CT framework structure would open up a new route to the highly stable, high-capacity, and excellent cycle and high-rate performance free-standing electrodes for high-performance Li-ion storage.

https://onlinelibrary.wiley.com/doi/10.1002/eem2.12586

▲ Vol 01 Issue 05 | 24 July , 2023

Crafting Pyrolysis-Free M–N–C Catalysts

Chang-Xin Zhao and Qiang Zhang

M–N–C catalysts, with their transition metal atoms coordinated to nitrogen/carbon atoms as active sites, are gaining attention for their versatile heterogeneous electrocatalysis. Fabrication of these catalysts can be achieved through either bottom-up chemical synthesis or top-down pyrolysis procedures, where the former offers a well-defined structure and precise synthesis feasibility. This Perspective provides an overview of the history of the technical route dispute between pyrolysis and pyrolysis-free M–N–C catalysts, along with their respective advantages and disadvantages. Additionally, we emphasize the advantages of pyrolysis-free M–N–C catalysts, exemplified by several studies focused on precisely modulating the structure to regulate the activity, as well as the efforts of effectively integrating the active sites. Finally, we discuss the challenges and opportunities of pyrolysis-free M–N–C catalysts, with the aim of maximizing their inherent strengths of precise structure and promoting their industrial applications.

https://pubs.acs.org/doi/10.1021/prechem.3c00026

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