当前位置: X-MOL 学术ACS Nano › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Cyanogel-Enabled Homogeneous Sb–Ni–C Ternary Framework Electrodes for Enhanced Sodium Storage
ACS Nano ( IF 17.1 ) Pub Date : 2018-01-05 00:00:00 , DOI: 10.1021/acsnano.7b07985
Ping Wu 1, 2 , Anping Zhang 2 , Lele Peng 1 , Fei Zhao 1 , Yawen Tang 2 , Yiming Zhou 2 , Guihua Yu 1
Affiliation  

Antimony (Sb) represents an important high-capacity anode material for advanced sodium ion batteries, but its practical utilization has been primarily hampered by huge volume expansion-induced poor cycling life. The co-incorporation of transition-metal (M = Ni, Cu, Fe, etc.) and carbon components can synergistically buffer the volume change of the Sb component; however, these Sb–M–C ternary anodes often suffer from uneven distribution of Sb, M, and C components. Herein, we propose a general nanostructured gel-enabled methodology to synthesize homogeneous Sb–M–C ternary anodes for fully realizing the synergestic effects from M/C dual matrices. A cyano-bridged Sb(III)–Ni(II) coordination polymer gel (Sb–Ni cyanogel) has been synthesized and directly reduced to an Sb–Ni alloy framework (Sb–Ni framework). Moreover, graphene oxide (GO) can be in situ immobilized within the cyanogel framework, and after reduction, reduced graphene oxide (rGO) is uniformly distributed within the alloy framework, yielding a homogeneous [email protected]–Ni ternary framework. The [email protected]–Ni framework with optimal rGO content manifests a high reversible capacity of ∼468 mA h g–1 at 1 A g–1 and stable cycle life at 5 A g–1 (∼210 mA h g–1 after 500 cycles). The proposed cyanogel-enabled methodology may be extended to synthesize other homogeneous ternary framework materials for efficient energy storage and electrocatalysis.

中文翻译:

氰基凝胶均质Sb-Ni-C三元骨架电极用于增强钠存储

锑(Sb)代表了先进钠离子电池的一种重要的高容量负极材料,但由于体积膨胀大导致循环寿命差,其实际应用受到了主要阻碍。过渡金属(M = Ni,Cu,Fe等的共混物))和碳组分可以协同缓冲Sb组分的体积变化;然而,这些Sb–MC–C三元阳极通常遭受Sb,M和C成分分布不均的困扰。在这里,我们提出了一种通用的纳米结构凝胶使能方法,可以合成均质的Sb-MC三元阳极,从而完全实现M / C对偶矩阵的协同效应。已合成了氰基桥连的Sb(III)-Ni(II)配位聚合物凝胶(Sb-Ni氰基凝胶)并将其直接还原为Sb-Ni合金骨架(Sb-Ni骨架)。此外,氧化石墨烯(GO)可以在原位还原后,还原的氧化石墨烯(rGO)均匀地分布在合金框架内,从而形成均匀的[受电子邮件保护]-Ni三元框架。具有最佳rGO含量的[受电子邮件保护] -Ni框架显示出在1 A g –1时具有468 mA hg –1的高可逆容量,在5 A g –1时具有稳定的循环寿命(500次循环后〜210 mA hg –1)。所提出的启用氰凝胶的方法可以扩展为合成其他均相三元框架材料,以进行有效的能量存储和电催化。
更新日期:2018-01-05
down
wechat
bug