过电位
石墨烯
电池(电)
阳极
阴极
材料科学
氧化物
电催化剂
复合数
拉曼光谱
MXenes公司
化学工程
电化学
电极
纳米技术
化学
复合材料
物理化学
冶金
功率(物理)
物理
工程类
量子力学
光学
作者
Abhishek Bharti,Gouranga Manna,Pinku Saha,Govindaraj Achutarao,Aninda J. Bhattacharyya
标识
DOI:10.1021/acs.jpclett.2c01499
摘要
We systematically diagnose here the various phases formed at the electrodes in a Li-CO2 battery. The CO2 cathode comprises a mixture of two-dimensional electrocatalysts, MXene and graphene oxide (MXene/GO), configured on Ni foam. The observed overpotential for MXene/GO (2.4 V) is lower than that for GO (2.8 V). MXene/GO also outperforms GO in terms of battery stability and performance. The overall battery reaction (Li2CO3 ↔ Li + CO2) is more efficient in the case of MXene/GO than in the case of GO. This is convincingly demonstrated using ex situ high-resolution synchrotron X-ray diffraction and Raman scattering spectroscopy, which strongly indicates that the MXene/GO composite is more capable than GO in converting Li2CO3 to Li and CO2. When the Li anode is probed, CO2 crossover is evident via the observation of the formation of LiOH/Li2CO3 phases, the proportions of which change during successive cycles.
科研通智能强力驱动
Strongly Powered by AbleSci AI