过电位
催化作用
电池(电)
碳纳米管
傅里叶变换红外光谱
材料科学
分解
化学工程
纳米技术
化学
电化学
电极
工程类
有机化学
物理化学
物理
功率(物理)
量子力学
作者
Pengfang Zhang,Tian Sheng,Yao Zhou,Yijin Wu,Chengcheng Xiang,Jin‐Xia Lin,Yuyang Li,Juntao Li,Ling Huang,Shi‐Gang Sun
标识
DOI:10.1016/j.cej.2022.137541
摘要
Li-CO2/O2 battery presents a promising solution to combine CO2 utilization and electrochemical energy storage. Herein, Pt nanoparticles (NPs) of 2.5 nm in mean size loaded uniformly on carbon nanotubes (Pt/CNT) were synthesized and served as cathodic catalysts. The Li-CO2/O2 battery with Pt/CNT catalyst were investigated in mixture gas of CO2 and O2 with O2 content varying from 0% to 20%. It has revealed that the Li-CO2/O2 (2% O2) battery, i.e., operating with 2% O2 content, displays a minimum overpotential of 0.31 V and a cycling stability of 127 cycles, which are significantly superior to the Li-CO2/O2 (20% O2) battery (0.51 V, 90 cycles) and the Li-CO2 battery (0% O2 content) (0.44 V, 110 cycles). Results of in-situ Fourier transform infrared (FTIR) spectroscopy have demonstrated the complete decomposition of Li2CO3 at 3.2 V in the Li-CO2/O2 (2% O2) battery. However, density function theory (DFT) calculations indicate that the decomposition energy barrier of Li2CO3 in Li-CO2/O2 (2% O2) battery is higher than that in Li-CO2 battery. SEM characterizations revealed a localized growth mechanism when O2 content is between 2% and 6% during the initial cycling, in which the Li2CO3 tends to form inside the Pt/CNT catalyst layer, rather than it distributes uniformly on both sides of the Pt/CNT catalyst layer with 0% or 20% O2 content. Such a growth mechanism ensures a better contacting interface between the Pt/CNT catalyst and Li2CO3, which plays a key role in optimal battery performance.
科研通智能强力驱动
Strongly Powered by AbleSci AI