Rechargeable magnesium
batteries (rMBs) have been recognized as
one of most promising next-generation energy storage devices with
high energy and power density. However, the development of rMBs has
been hampered by the lack of usable cathode materials with high capacity
and cycling stability. Herein, we report an ultra-rapid, cost-effective,
and scalable synthesis of ultrathin CuS hierarchical nanosheets by
a one-step microwave-assisted preparation. Benefiting from the exceptional
structural configuration, when used as the cathode material for rMBs
at room temperature, the CuS hierarchical nanosheets deliver a high
reversible discharge capacity of 300 mA h g–1 at
20 mA g–1, remarkable rate capability (256.5 mA
h g–1 at 50 mA g–1 and 237.5 mA
h g–1 at 100 mA g–1), and excellent
cycling stability (135 mA h g–1 at 200 mA g–1 over 200 cycles). To date, the obtained excellent
electrochemical performances are superior to most results ever reported
for cathode materials of rMBs.
Copper
sulfides are broadly explored as the possible cathode materials
for rechargeable magnesium batteries on account of their high theoretical
capacity of 560 mAh g–1. However, the CuS cathodes
usually suffer from serious capacity decay caused by structure collapse
during the repeated magnesiation/demagnesiation process. Herein, we
present a cuprous self-doping strategy to synthesize mesoporous CuS
nanotubes with robust structural stability for rechargeable magnesium
batteries and regulate their electrochemical magnesium storage behavior.
Electrochemical results show that the mesoporous CuS nanotubes can
exhibit high specific capacity, remarkable cycling performance, and
good rate capability. The observed discharge capacity of the mesoporous
CuS nanotubes could reach about 281.2 mAh g–1 at
20 mA g–1 and 168.9 mAh g–1 at
500 mA g–1. Furthermore, a remarkable ultralong-term
cyclic stability with a reversible capacity of 72.5 mAh g–1 at 1 A g–1 is obtained after 550 cycles. These
results demonstrate that the mesoporous nanotube structure and the
simple cuprous self-doping effect could promote the practical application
of copper sulfide cathode materials for rechargeable magnesium batteries.
Sheet-assembled hollow CuSe nanocubes are fabricated by a facile template-directed selenation method and exhibit record rate capability among the chalcogenide compounds reported so far.
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