Zn and Co oxides possess high theoretical capacity; however, their application in the field of lithium-ion batteries (LIBs) is greatly limited because of poor conductivity and large volume fluctuation. Herein, the multi-protuberant nanofiber structure was formed by combining two-dimensional (2D) Ti 3 C 2 nanosheets and zero-dimensional (0D) ZnCo 2 O 4 nanoparticles on the surface and inside one-dimensional (1D) carbon nanofibers (Ti 3 C 2 @ZnCo 2 O 4 @carbon nanofibers) for lithium-ion storage. The Ti 3 C 2 @ZnCo 2 O 4 @carbon nanofiber composite prepared by electrospinning, annealing, and oxidation at low temperature provides abundant active sites and an efficient conductive network to enhance the storage capacity and transfer rate of lithium ions. The Ti 3 C 2 @ZnCo 2 O 4 @carbon nanofiber anode provides high reversible specific capacity (1112.51 mA h g −1 at 0.2 A g −1 ), outstanding cycle stability (603.796 mA h g −1 at 0.5 A g −1 after 300 cycles), and excellent rate performance (455.05 mA h g −1 at 3 A g −1 and maintains 920.17 mA h g −1 when current is restored to 0.1 A g −1 ). The remarkable Li storage originates from the stable multiprotuberant nanofiber structure and fast electrochemical kinetics. The unique structure design of Ti 3 C 2 @ZnCo 2 O 4 @carbon nanofibers also provides an effective strategy for other electrochemical fields.
Electromagnetic
wave (EMW) absorption materials have tremendous
potential in protecting national security and human health from harmful
electromagnetic irradiation. However, it is still a great challenge
to achieve lightweight and broadband high-performance EMW absorption.
Integrating layered double hydroxides (LDH) with porous biomass materials
is a promising approach to construct magnetic metal/porous carbon
composites as highly efficient EMW absorption materials due to their
synergy loss, lightweight, and low-cost characteristics. Herein, FeNi
alloy nanosheet array/porous carbon (FeNi/PC) hybrids derived from
FeNi/loofah sponges have been prepared by hydrothermal and subsequent
carbonization processes. As expected, the FeNi/PC hybrids achieve
a high reflection loss of −58.3 dB at 2.98 mm and exhibits
a broad effective absorption bandwidth (EAB) of 6.72 GHz with 8 wt
% filler content. The outstanding EMW absorption performance of the
FeNi/PC hybrid provides a new insight into the design of biomass-based
composite materials as lightweight and broadband high-performance
EMW absorbers.
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