Hydrothermal synthesis, structure refinement, and electrochemical characterization of Li₂CoGeO₄ as an oxygen evolution catalyst

Abstract

We report hydrothermal synthesis and structural refinement of Li2CoGeO4, as well as its use as a catalyst for oxygen evolution reaction.

Synthesis, optical and ionic conductivity studies of a lithium cobalt germanate compound

“…9 The framework structure of Li 2 -CoGeO 4 host can be considered as a Wurtzite structure with corner-sharing alternating between the corners of the GeO 4 and ZnO 4 tetrahedra. In general, the orthogermanates are characterized by tetrahedral anion units, in particular (GeO 4 ) 4 , Fig. 1 Refined powder X-ray diffraction pattern for solide-state LCG, at room temperature: calculated data (black solid line), observed data (red)and the Bragg positions are observable by vertical bar.…”

“…It consists of binary chains of distorted (CoO 4 ) 4À tetrahedra that were alongside-propagated in the (a, b) plan and interlinked partially by corner-sharing. Each (GeO 4 ) 4 (2) were conned in two opposite direction cavities (T1 and T2) (Fig. 2).…”

“…chemical formula have obtained growing attention, principally due to their interesting physical applications such as magnetic, catalytic, solid electrolytic properties for batteries, optics and photocatalysts. [1][2][3][4][5] A lot of research has been done on orthogermanate compounds with the formula A 2 MGeO 4 (A ¼ Li, Na and M ¼ Zn, Co, Fe, Mn) and conrmed that this material is a potential cathode due to its high conductivity, 4 taking into account that the ionic conductivity is highly related to the structural rearrangement. The conductivity of this type of compound has been studied since the 1960s with different lithium and sodium environments, revealing that these materials can offer an almost perfect conductivity.…”

Enhanced Li-storage performances of dually-protected CoGeO3 nanocomposites as anode materials for lithium ion batteries

“…In the succedent scans, the peak at 1.36 V could be ascribed to the emergence of Li 2 CoGeO 4 [47]. During the 1 st anodic scan, two obvious peaks at 0.45 V and 1.40 V were observed, which could be assigned to the delithiation of Li-Ge alloys at 0.45 V (Eq.…”

“…3), followed by the reoxidation of Ge (Co) to form GeO 2 (CoO) [11,48] (Eqs. 4, 5) and formation of Li 2-x CoGeO 4 (at 1.4 V) [47] (Eq. 6),…”