One-dimensional (1D) Zn 2 GeO 4 rods were in-situ grown on Ni foam (NF) using a ethylenediamine (En)/water mixed solvent by a hydrothermal route in one single step. Such rhombohedral phase Zn 2 GeO 4 rods are 1–2 μm in diameter and a few micrometers in length. Ethylenediamine is found to play a critical role in coordinating with starting zinc and germanium ions and acting as template. The Zn 2 GeO 4 /NF was developed as a new none-enzymatic hydrogen peroxide (H 2 O 2 ) sensor. In electrochemical studies, the Zn 2 GeO 4 /NF electrode exhibits high sensitivity (3974 μM mM −1 cm −2 ), wide linear detection range (1–4000 μM), fast response (<9 s), low detection limit (1 μM), excellent selectivity and stability towards H 2 O 2 . Several factors such as intrinsic nature of Zn 2 GeO 4 , the unique microstructure and the seamless contact with NF are believed to attributed to the excellent electrochemical sensing performances.
T. T. Yu,H. L. Liu,M. Huang,J. H. Zhang,D. Q. Su,Z. H. Tang,J. F. Xie,Y. J. Liu,A. H. Yuan,Q. H. Kong
To improve the electrical conductivity and cycling stability of germanium compounds as anode materials for lithium ion batteries (LIBs), Zn2GeO4 nanorods grown on carbon cloth (Zn2GeO4/CC) were designed and fabricated by a simple hydrothermal process combined with a post-annealing treatment. The Zn2GeO4/CC composites possess hierarchical porosity and a network structure. Serving as free-standing and binder-free anodes for LIBs, they exhibit high specific capacity and excellent reversibility. A discharge capacity as high as 1851.9 mA h g−1 is attained at a current density of 200 mA g−1, and the Zn2GeO4/CC electrode still maintains a high reversible capacity of 1302.3 mA h g−1 after 200 cycles. Even at a high specific current of 2000 mA g−1, it still retains a capacity of 847.5 mA h g−1. The superior electrochemical performance of the Zn2GeO4/CC composites is attributed to the synergistic effects of the hierarchical porosity, Zn2GeO4 nanorods, and 3D carbon cloth network structure, which can effectively accommodate the huge volume change of the Zn2GeO4 nanorods during cycling and maintain perfect electrical conductivity throughout the electrode. Moreover, the excellent mechanical flexibility of the Zn2GeO4/CC composites makes the material a promising candidate for self-supported and flexible electrodes for LIBs.
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