过电位
材料科学
阴极
电池(电)
阳极
电解质
催化作用
氧化还原
无机化学
化学工程
电极
化学
电化学
物理化学
有机化学
冶金
热力学
功率(物理)
物理
工程类
作者
Wenbo Liu,Xin Sui,Changkun Cai,He Huang,Rui Xu,Dongsheng Geng,Mingyang Chen,Jun Lü
标识
DOI:10.1002/aenm.202201675
摘要
Abstract Mg‐CO 2 batteries, which exploit the greenhouse gas CO 2 as cathode active species, are an appealing next‐generation battery candidate due to their high efficiency energy storage and value‐added CO 2 utilization. However, compared with other metal‐CO 2 systems, few aprotic Mg‐CO 2 batteries have been reported so far as a result of several crucial problems including the comparatively slow redox reaction kinetics, a large decomposition energy barrier of the reduction products, and poor reversibility in their multi‐electron three‐phase cathodic reactions in nonaqueous environments. Herein, a rechargeable Mg‐CO 2 battery is developed by using a Mo 2 C‐CNTs catalytic cathode, a nonaqueous electrolyte, and a magnesium metal anode. The Mo 2 C‐CNTs catalytic cathode can greatly reduce the charge overpotential of the Mg‐CO 2 battery through tuning the CO 2 reduction pathways. The results of a variety of ex situ and in situ experiments as well as theoretical calculations show the Mo 2 C catalyst not only induces surface molecular adsorption for faster reaction kinetics but also improves the selectivity toward MgC 2 O 4 in the CO 2 reduction process for a higher Faraday efficiency. An exceptional low voltage hysteresis is achieved for the Mg‐CO 2 battery. This work demonstrates a promising strategic option for rechargeable nonaqueous Mg‐CO 2 batteries for simultaneously addressing energy and environmental issues.
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