Cai Jinghua, Lan Yuanqi, He Haiyan, Zhang Xinyuan, Armstrong A Robert, Yao Wenjiao, Lightfoot Philip, Tang Yongbing
Functional Thin Films Research Center, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen 518055, China.
Shenzhen College of Advanced Technology, University of Chinese Academy of Sciences, Shenzhen 518055, China.
Inorg Chem. 2020 Dec 7;59(23):16936-16943. doi: 10.1021/acs.inorgchem.0c02014. Epub 2020 Nov 16.
Transition-metal oxalates have wide applications in magnetics, photoemission, electrochemistry, etc. Herein, using hydrothermal reactions, five cobalt(II) oxalates, NaCo(CO)·2HO (), NaCo(CO)·8HO (), KLiCo(CO) (), LiCo(CO) (), and (NH)Co(CO)F () have been synthesized, and their structures are determined from single-crystal X-ray diffraction or Rietveld refinement of powder X-ray diffraction data. Notably, and are identified for the first time. The structures of these cobalt oxalates are versatile, covering 0D, 1D, 2D, and 3D frameworks, while the coordination environments of Co centers are uniquely distorted octahedra. As representative examples, and are investigated as cathode materials for secondary batteries. Both exhibited electrochemical activity despite large cell polarization. The present study enriches the transition-metal oxalate family and provides new options for energy storage materials.
过渡金属草酸盐在磁性、光发射、电化学等领域有广泛应用。在此，通过水热反应合成了五种钴（II）草酸盐，即NaCo(C₂O₄)·2H₂O ()、NaCo(C₂O₄)·8H₂O ()、KLiCo(C₂O₄)₂ ()、LiCo(C₂O₄)₂ () 和(NH₄)₂Co(C₂O₄)₂F₂ ()，并通过单晶X射线衍射或粉末X射线衍射数据的Rietveld精修确定了它们的结构。值得注意的是， 和 首次被鉴定出来。这些钴草酸盐的结构多样，涵盖了零维、一维、二维和三维框架，而钴中心的配位环境是独特的扭曲八面体。作为代表性例子， 和 被研究作为二次电池的阴极材料。尽管电池极化较大，但两者都表现出电化学活性。本研究丰富了过渡金属草酸盐家族，并为储能材料提供了新的选择。
