合成 Ni2P–Co 莫特–肖特基结作为电催化剂促进硫转化动力学及其在锂硫电池隔膜改性中的应用,ACS Applied Materials & Interfaces

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合成 Ni2P–Co 莫特–肖特基结作为电催化剂促进硫转化动力学及其在锂硫电池隔膜改性中的应用
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2023-01-23 , DOI: 10.1021/acsami.2c19735
Qiang Zhang _{1,

2} , Xu Zhang _{1,

2} , Shaoming Qiao _{1,

2} , Da Lei _{1,

2} , Qian Wang _{1,

2} , Xiaoshan Shi _{1,

2} , Chunhong Huang _{1,

2} , Wang Lu _{1,

2} , Shixuan Yang _{1,

2} , Yuhan Tian _{1,

2} , Zhiqing Liu _{1,

2} , Gaohong He _{1,

2} , Fengxiang Zhang _{1,

2}

Affiliation

为了克服多硫化物的穿梭效应和缓慢的转化动力学，已经设计了大量用于锂硫（Li-S）电池的催化剂。在此，设计了一种由 Co 纳米颗粒和 Ni ₂ P 组成的 Mott-Schottky 结催化剂，以改善多硫化物动力学。我们的研究表明，肖特基结界面处的电荷重排和内置电场的构建对于降低溶解的 Li ₂ S _n还原和 Li ₂ S 成核反应的活化能至关重要。此外，还进行了一系列实验和电化学测试，以证明肖特基催化效应增强了协同催化效应。与 Ni ₂^{P-Co@CNT催化剂，该电池在4.0 C的倍率下表现出874 mAh g -1}的初始比容量，700次循环中每次循环的衰减率为0.049%。^{同时，在 10 mg cm –2}的高硫负载下，电池在 100 个循环中以 0.5 C 显示每个循环的衰减率为 0.118% 。_{本文提出的肖特基异质结结构已被证明对Li 2} S _n_{的还原和Li 2} S的成核具有良好的催化作用，为高效合理的催化剂设计提供了深刻的指导。

"点击查看英文标题和摘要"

Synthesis of the Ni2P–Co Mott–Schottky Junction as an Electrocatalyst to Boost Sulfur Conversion Kinetics and Application in Separator Modification in Li-S Batteries

To overcome the shuttling effect and sluggish conversion kinetics of polysulfides, a large number of catalysts have been designed for lithium–sulfur (Li–S) batteries. Herein, a Mott–Schottky junction catalyst composed of Co nanoparticles and Ni₂P was designed to improve polysulfide kinetics. Our investigations reveal the rearrangement of charges at the Schottky junction interface and the construction of the built-in electric field are crucial for lowering the activation energy of the dissolved Li₂S_n reduction and Li₂S nucleation reaction. Furthermore, a series of experimental and electrochemical tests were performed to demonstrate that the Schottky catalytic effect enhanced the synergistic catalytic effect. With a Ni₂P–Co@CNT catalyst, the battery exhibits an initial specific capacity of 874 mAh g^–1 at a rate of 4.0 C, and the decay rate per cycle is 0.049% in 700 cycles. Meanwhile, the battery shows 0.118% decay rate per cycle at 0.5 C in 100 cycles at a high sulfur loading of 10 mg cm^–2. The Schottky heterojunction structure proposed here has been shown to have a good catalytic effect on the reduction of Li₂S_n and nucleation of Li₂S, which provides a profound guidance for efficient and rational catalyst design.

更新日期：2023-01-23

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