论文成果
Localized nitride strategy to construct interfacial and electronic modulated WO<sub>3</sub>/WN nanoparticles for superior lithium-ion storage
- 发布时间：2024-12-24
- 点击次数：
- 关键字：OXIDE-ASSISTED SYNTHESIS; ANODE MATERIAL; NANOSHEETS; PERFORMANCE; NANOBELTS; MOS2
- 摘要：The interfacial effect is important for the tungsten trioxide (WO3)-based anode to achieve superior lithium-ion storage performance. Herein, the interfacial effect was constructed by in-situ surface direct nitridation reaction at 600 degrees C for 30 min of the as-synthesis WO3 nanoparticles (WO3/WN). X-ray photoelectron spectroscopy (XPS) analysis confirms evident chemical interaction between WO3 and WN via the interfacial covalent bond (W-O-N). This WO3/WN anode shows a distinct interfacial effect for an efficient interatomic electron migration. Electrochemical kinetic analysis shows enhanced pseudocapacitance contribution. The galvanostatic intermittent titration technique (GITT) result demonstrates improved charge transfer kinetics. Ex-situ X-ray diffraction (XRD) analysis reveals the reversible oxidation and reduction reaction of the WO3/WN anode. The density functional theory (DFT) result shows that the evident interfacial bonding effect can enhance the electrochemical reaction kinetics of the WO3/WN anode. The discharge capacity can reach up to 546.9 mA h g(-1) at 0.1 A g(-1) after 200 cycles. After 2000 cycles, the capacity retention is approximately 85.97 % at 1.0 A g(-1). In addition, the WO3/WN full cell (LiFePO4/C//WO3/WN) demonstrates excellent rate capability and capacity retention ratio. This in-situ surface nitridation strategy is an effective solution for designing an oxide-based anode with good electrochemical performance and beyond.
- 卷号：677
- 期号：-
- 是否译文：否