Different oxygen functionalization processes occur for N-doped soft carbon (N-SC) and hard carbon (N-HC), and there may be a competitive relationship between the formation of pyridinic-N and C=O groups. For...
In this study, we have fabricated
carbon dot/reduced graphene oxide
(CDs/rGO) composites using oxygen-functionalized CDs and conductive
graphene oxide (GO) by a hydrothermal method and calcination at 250
°C. The CDs can manipulate the surface functional groups of the
composites by consuming C–O bonds and introducing CO
bonds. As sodium-ion battery anodes, CDs/rGO with a high CO
group content exhibits a great reversible capacity of 308 mAh g–1 at 0.05 A g–1, which is up to 1.8
times that of rGO (173 mAh g–1). It retains a capacity
of 116 mAh g–1 after 2000 cycles at 2 A g–1. When assembled into a full cell, the activated anode and NVP@C
display a higher initial discharge capacity of 291 mAh ganode
–1 with an average working voltage of 2.5 V. The
good performance of CDs/rGO is mainly due to the synergistic effects
of the CDs with abundant Na storage sites and rGO with a conductive
network. The improved electrochemical properties are dominated by
the capacitive Na storage mechanism. This work implies that the oxygen-functionalized
CDs could serve as medium to regulate the surface chemistry of carbon
materials.
The rapid carbonization with only 10 min achieves the balance of sodium storage sites and electronic conductivity for MOFs derived carbon, delivering excellent sodium storage properties. This work supplies a...
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