当前位置:首页>南京>新余学院/南京工业大学《JAC》: 异质结工程化的Co、Fe共掺杂Ni₂P@Ti₃C₂Tₓ三维网络结构,用于增强锂存储

新余学院/南京工业大学《JAC》: 异质结工程化的Co、Fe共掺杂Ni₂P@Ti₃C₂Tₓ三维网络结构,用于增强锂存储

  • 2026-05-29 14:44:50
新余学院/南京工业大学《JAC》: 异质结工程化的Co、Fe共掺杂Ni₂P@Ti₃C₂Tₓ三维网络结构,用于增强锂存储

1成果简介 

锂离子电池(LIBs)广泛用于便携电子设备和电动汽车,但商用石墨负极容量(372 mAh/g)有限。过渡金属磷化物(TMPs)如NiPCoPFeP因高导电性和高离子电导率而备受关注,但仍面临体积膨胀和本征导电性不足等问题。基于此,南京工业大学杨建教授团队与新余学院江尉通过磷化NiFeCo-LDH@TiCTₓ前驱体,原位构建了一种独特的三维(3D)网络结构复合材料NiFeCoP@TiCTₓ。其中,CoFe共掺杂的NiPNiFeCoP)纳米片通过异质结锚定在TiCTₓ纳米片上。

3D网络结构不仅建立了三维导电网络,还在异质界面处产生了内建电场,有效加速了电子/离子传输,同时提高了电极的结构稳定性。DFT计算表明,Co掺杂进一步优化了NiFeCoP的电子结构,引入了更多活性位点,促进了电化学反应动力学。同时,NiFeCo不同氧化还原电位的协同效应有效缓冲了充放电过程中的体积变化。作为锂离子电池负极,NiFeCoP@TiCTₓ在不同电流密度下均表现出优异的电化学性能:0.5 A/g下循环340次后容量为950 mAh/g1 A/g下循环900次后为816 mAh/g2 A/g下循环1000次后为541 mAh/g。相关研究成果以“Heterojunction-engineered Co, Fe co-doped NiP@TiCT with 3D network structure for enhanced lithium storage”为题发表在化工领域Journal of Alloys and Compounds 期刊上(杨建教授为通讯作者、江尉为论文一作)

2图文导读  

1. NiFeCoP@Ti3C2Tx 复合材料的制备流程示意图。

2. abXRD 图谱;(cdNiFeCoP@Ti3C2TxSEM图像;(e)TEM图像;(fgHR-TEM图像;(h) SAED 图谱;(ilSTEM-EDS元素分布图。

3. a) S-NRP@Ti3C2Tx0.2 mVs-1时的CV曲线,b) S-NRP@Ti3C2TxNRP@Ti3C2TxRP/Ti3C2TxRP的速率能力,c) S-NRP@Ti3C2Tx0.2-4 a g-1时的GCD曲线,d) S-NRP@Ti3C2TxNRP@Ti3C2TxRP/Ti3C2TxRP1 a g-1时的库仑效率和循环性能,f) S-NRP@Ti3C2TxNRP@Ti3C2TxRP/Ti3C2TxRP2 a g-1时的库仑效率和循环性能,f) EIS曲线以及S-NRP@Ti3C2TxRP/Ti3C2TxRPZ 'ω1/2的关系,以及等价电路(插图)h-k)1 Ag-1下循环300次前后RPS-NRP@Ti3C2Tx电极的SEM横截面图像。

4. (a) Ni₂P NiFePNiFeCoP PDOS (b)NiFeCoPNiCoFe TDOS (c) Ni₂P  Ni₂P / Ti₃C₂O₂ 异质结的 PDOS (d) Ni₂P 的工作函数;(e) Ti₃C₂O₂ 的工作函数;(f) Ni₂P / Ti₃C₂O₂ 异质结构的工作函数;(g) Ti₃C₂O₂ / Ni₂P 异质结的三维差分电荷密度等值面图;(h)二维差分电荷密度等高线图;(i)沿界面法线方向的平面平均电荷密度差。

5. NiFeCoP@ Ti₃C₂Tₓ 的:(a) 0.20.40.60.81 mV/s速率下的循环伏安曲线,以及log(i)logν)的作图关系(插图);(b) 0.20.40.60.81 mV/s速率下电容行为的贡献比;(c) 1 mV/s速率下电容行为的贡献;(de) EIS曲线及Z′w-1/2的线性拟合;(f) NiFeCoP@ Ti₃C₂Tₓ NiFeP@ Ti₃C₂Tₓ NiFeCoPNiFeCoP@ Ti₃C₂Tₓ 2 A/g电流密度下循环500次后的 GITT 曲线;(gh) 充放电过程中的Li+扩散系数。

3小结 

本文通过磷化NiFeCo-LDH@Ti₃C₂Tₓ成功合成了具有3D网络结构的NiFeCoP@Ti₃C₂Tₓ复合材料。NiFeCoP纳米片通过异质结锚定在Ti₃C₂Tₓ上,形成内建电场,比表面积为50.1 m²/g。作为LIBs负极,该材料在不同电流密度下均表现出优异的循环稳定性(0.5 A/g340次循环后950 mAh/g1 A/g900次循环后816 mAh/g),优化的Li⁺扩散系数(1.03×10⁻¹¹ cm²/s)和伪电容贡献(0.2–1 mV/s58–73%)。3D网络异质结构协同内建电场加速了电子/离子传输并增强了结构稳定性;Co掺杂优化电子结构、增加活性位点;Ni/Fe/Co不同氧化还原电位协同缓解体积变化。该工作为设计高性能磷化物基储能材料提供了可行策略。

文献:

10.1016/j.jallcom.2026.187478

往期精彩回顾
哈工大《Carbon》:层级CoFe/氮掺杂碳/CNF复合材料,用于航空航天和隐身技术等
中国矿大(北京)《Langmuir》:非共价功能化驱动石墨烯稳定分散!突破石墨烯纤维制备瓶颈
韩国成均馆大学《ACS Nano》:采用全碳材料电极的同轴光纤超级电容器

来源:文章来自南京工业大学投稿

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  1. CONNECT:[ UseTime:0.000539s ] mysql:host=127.0.0.1;port=3306;dbname=b460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000884s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000346s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000269s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000584s ]
  6. SELECT * FROM `set` [ RunTime:0.000238s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000678s ]
  8. SELECT * FROM `article` WHERE `id` = 568174 LIMIT 1 [ RunTime:0.000950s ]
  9. UPDATE `article` SET `lasttime` = 1780209980 WHERE `id` = 568174 [ RunTime:0.001322s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000273s ]
  11. SELECT * FROM `article` WHERE `id` < 568174 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000700s ]
  12. SELECT * FROM `article` WHERE `id` > 568174 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000410s ]
  13. SELECT * FROM `article` WHERE `id` < 568174 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.002403s ]
  14. SELECT * FROM `article` WHERE `id` < 568174 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001770s ]
  15. SELECT * FROM `article` WHERE `id` < 568174 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001589s ]
0.113264s