▎ 摘　　要

The development of sodium-ion batteries with a high-power density and long life has attracted considerable interest because of their low cost and potential applications. In this work, we constructed N-doped graphene supported pseudocapacitive material consisting of Ni3S4 grains (50 nm) coated by 3-4 layers of MoS2 (MoS2 @Ni3S4/NG) by facile one-step pyrolysis of nickel phthalocyanine. When the electrode was used as an anode for sodium-ion batteries, a pseudocapacitance-dominated storage mechanism was established, and the extrinsic pseudocapacitance could be further enhanced with the structural evolution of MoS2 @Ni3S4 during the sodiation/desodiation process, contributing to fast kinetics of Na+ storage. The results of impedance analysis indicated that the MoS2 layers play a vital role in reducing the charge-transfer resistance because the MoS2 with wider interlayer spacing enables Na+ to intercalate with a lower energy barrier compared with intercalating into Ni3S4 directly. As a result, the electrode exhibits a superior cycle life over 1000 cycles, and an excellent rate capacity of 564 mAh g(-1) can be achieved at 0.5 A g(-1). (C) 2021 Elsevier Ltd. All rights reserved.