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在水性-N电池阴极中的M₂B₂MBenes的高催化性能:理论研究

Lianming Zhao¹, Zhumei Jiang¹, Zeyue Peng¹

¹Shandong Key Laboratory of Intelligent Energy Materials, School of Materials Science and Engineering, China University of Petroleum (East China), Qingdao, Shandong 266580, China.

Langmuir : the ACS journal of surfaces and colloids

|September 10, 2025

概括

这项研究探讨了M₂B₂ MBenes作为水性- (Li-N₂) 电池的阴极. Cr₂ B₂ MBene显示出异常的催化活性,为先进的能量存储铺平了道路.

科学领域:

材料科学材料科学材料科学
电化学电化学电化学
计算化学的计算化学

背景情况:

水性-N2电池提供了有前途的能量储存,但已经讨论了反应机制.
作为潜在的阴极材料,MBenes (M₂B₂) 被研究.

研究的目的:

研究M₂B₂MBenes (M = Ti,Zr,Hf,Cr,Mo,W) 作为水性Li-N₂电池的阴极的催化机制.
阐明影响它们的催化活性和反应途径的因素.

主要方法:

使用密度函数理论 (DFT) 的计算.
研究了N₂吸附,Li₃N形成,氨合成和LiOH分解.
分析了电子性质,吸附点和反应超电位.

主要成果:

M₂B₂ 由于d电子状态跨越费米水平,MBenes具有高导电性.
IVB组的MBenes (Ti,Zr,Hf) 在hcp部位有利于侧向N₂吸附;VIB组的MBenes (Cr,Mo,W) 有利于fcc部位.
Cr₂B₂在低放电 (0.69 V) 和充电 (0.16 V) 超电位的情况下表现出优越的催化性能.

结论:

IVB和VIB MBenes之间的催化活性差异源于不同的吸附点和配置.
反应机制涉及N₂吸附,Li₃N形成,水解和LiOH分解,以控制放电的方式运行.
这项理论研究为设计使用MBenes的高性能Li-N₂电池提供了基础.

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