Hu Zhe, Xie Yaoyi, Yu Deshuang, Liu Qiannan, Zhou Limin, Zhang Kai, Li Peng, Hu Feng, Li Linlin, Chou Shulei, Peng Shengjie
Jiangsu Key Laboratory of Electrochemical Energy Storage Technologies, College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China.
Institute for Superconducting and Electronic Materials, Australian Institute for Innovative Materials, University of Wollongong Innovation Campus, Squires Way, North Wollongong, New South Wales 2522, Australia.
ACS Nano. 2021 May 25;15(5):8407-8417. doi: 10.1021/acsnano.0c10558. Epub 2021 May 12.
Electrochemical carbon dioxide conversion at ambient temperature is an efficient route to synchronously provide a continuous power supply and produce useful chemicals such as carbonates. Rigid catalysts with rational morphological and structural design are used to overcome the sluggish reaction kinetics and contribute to a better cycle life in Li-CO batteries. In this report, a two-dimensional TiCT MXene/carbon heterostructure assembled parallel-aligned tubular architecture was delicately synthesized through a self-sacrificial templating method and delivered an ultralow overpotential of 1.38 V at 0.2 A·g. The heterostructure that inherited the high catalytic performance of TiCT MXene and the outstanding stability of carbon material promoted the adsorption of CO and accelerated the decomposition of lithium carbonate, which was proved by and characterizations and density functional theory calculations. The tubular architecture with large surface area was demonstrated to provide a high durability for long cycle life and ensure good contacts among gas, electrolyte, and electrode.
室温下的电化学二氧化碳转化是一种同步提供持续电源并生产碳酸盐等有用化学品的有效途径。具有合理形态和结构设计的刚性催化剂用于克服缓慢的反应动力学，并有助于锂-二氧化碳电池具有更好的循环寿命。在本报告中，通过自牺牲模板法精心合成了一种二维TiCT MXene/碳异质结构组装的平行排列管状结构，在0.2 A·g下具有1.38 V的超低过电位。继承了TiCT MXene的高催化性能和碳材料出色稳定性的异质结构促进了CO的吸附并加速了碳酸锂的分解，这通过表征和密度泛函理论计算得到了证实。具有大表面积的管状结构被证明可为长循环寿命提供高耐久性，并确保气体、电解质和电极之间的良好接触。
