Abstract Intercalation chemistry/engineering has been widely investigated in the development of electrochemical energy storage. Graphite, as an old intercalation host, is receiving vigorous attention again via a new halogen intercalation. Whereas, exploiting new intercalation hosts and optimizing the intercalation effect still remains a great challenge. This study fabricates a Cu 2 Se intercalation compound showing expanded interlayer space and nanosheet array features by using a green growth approach, in which cetyltrimethyl ammonium bromide (CTAB) is inserted into Cu 2 Se at an ambient temperature. When acting as an electrode material for sodium‐ion batteries, the Cu 2 Se–CTAB nanosheet arrays exhibit excellent discharge capacity and rate capability (426.0 mAh g −1 at 0.1 A g −1 and 238.1 mAh g −1 at 30 A g −1 ), as well as high capacity retention of ≈90% at 20 A g −1 after 6500 cycles. Benefiting from the porous array architecture, the transport of electrolytes is facilitated on the surface of Cu 2 Se nanosheets. In particular, the CTAB intercalated in the interlayer space of Cu 2 Se can increase its buffer space, stabilize the polyselenide shuttle, and prevent the fast growth of Cu nanoparticles during its electrochemical process.

Nanosheet

Ammonium bromide

10.1002/aenm.202000666

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Citations (85)

Confining Ultrathin 2D Superlattices in Mesoporous Hollow Spheres Renders Ultrafast and High‐Capacity Na‐Ion Storage

Advanced Energy Materials (2020)

Qingbing Xia Yaru Liang Zeheng Lin Shiwen Wang Wei‐Hong Lai

Abstract Sodium‐ion batteries have attracted ever‐increasing attention in view of the natural abundance of sodium resources. Sluggish sodiation kinetics, nevertheless, remain a tough challenge, in terms of achieving high rate capability and high energy density. Herein, a sheet‐in‐sphere nanoconfiguration of 2D titania–carbon superlattices vertically aligned inside of mesoporous TiO 2 @C hollow nanospheres is constructed. In such a design, the ultrathin 2D superlattices consist of ordered alternating monolayers of titania and carbon, enabling interpenetrating pathways for rapid transport of electrons and Na + ions as well as a 2D heterointerface for Na + storage. Kinetics analysis discloses that the combination of 2D heterointerface and mesoporosity results an intercalation pseudocapacitive charge storage mechanism, which triggers ultrafast sodiation kinetics. In situ transmission electron microscope imaging and in situ synchrotron X‐ray diffraction techniques elucidate that the sheet‐in‐sphere architecture can maintain robust mechanical and crystallographic structural stability, resulting an extraordinary high rate capability, remarkable stable cycling with a low capacity fading ratio of 0.04% per cycle over 500 cycles at 0.2 C, and exceptionally long‐term cyclability up to 20 000 cycles at 50 C. This study offers a method for the realization of a high power density and long‐term cyclability battery by designing of a hierarchical nanoarchitecture.

10.1002/aenm.202001033

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Citations (31)

Bimetallic cerium and ferric oxides nanoparticles embedded within mesoporous carbon matrix: Electrochemical immunosensor for sensitive detection of carbohydrate antigen 19-9

Biosensors and Bioelectronics (2019)

Minghua Wang Mengyao Hu Bin Hu Chuanpan Guo Yingpan Song

Bimetallic strip

Matrix (chemical analysis)

Carbon fibers

Cerium oxide

10.1016/j.bios.2019.04.018

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