A low-overpotential sodium/fluorinated graphene battery based on silver nanoparticles as catalyst.,Journal of Colloid and Interface Science

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A low-overpotential sodium/fluorinated graphene battery based on silver nanoparticles as catalyst.
Journal of Colloid and Interface Science ( IF 9.4 ) Pub Date : 2020-01-07 , DOI: 10.1016/j.jcis.2020.01.011
Wen Liu ₁ , Rui Guo ₁ , Yong Wang ₁ , Guoju Dang ₂ , Yong Li ₁ , Yanting Sun ₁ , Ping Huang ₃ , Haijuan Pei ₁ , Jiachun Lu ₃ , Jingying Xie ₁

Affiliation

Fluorinated graphene (F-GNS) was synthesized using commercial graphene (GNS) as starting material and introduced in sodium batteries, which exhibited good rate performance, but large voltage gap between discharge and charge process. Ag nanoparticles were employed in freestanding and binder-free F-GNS electrode (the composite film electrode was labeled as FGA) as catalyst, which were shown to strongly facilitate the decomposition of NaF during charge process in sodium/carbon fluorides (Na/CFx) secondary batteries. During discharge process, the discharge voltage with Ag was about the same as that of Na/F-GNS cell. During charge process, the charge voltage of Na/FGA cell was substantially lower (by 480 mV) than that of Na/F-GNS cell, thus leading to a lower overpotential and a higher electric efficiency. Nanosized amorphous discharge products of NaF formed in Na/FGA cells were ascribed as the key role in reducing the polarization.

中文翻译：

基于银纳米粒子作为催化剂的低电位钠/氟化石墨烯电池。

以商业石墨烯（GNS）为原料合成了氟化石墨烯（F-GNS），并引入到钠电池中，具有良好的倍率性能，但充放电之间存在较大的电压差。Ag纳米粒子被用于独立式和无粘合剂的F-GNS电极（复合膜电极标记为FGA）作为催化剂，显示出在钠/碳氟化物（Na / CFx）充电过程中强烈促进NaF分解二次电池。在放电过程中，Ag的放电电压与Na / F-GNS电池的放电电压大致相同。在充电过程中，Na / FGA电池的充电电压明显低于Na / F-GNS电池的充电电压（降低480 mV），从而导致较低的过电势和较高的电效率。

更新日期：2020-01-07

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