20344-49-4Relevant articles and documents
Facile Access to an Active γ-NiOOH Electrocatalyst for Durable Water Oxidation Derived From an Intermetallic Nickel Germanide Precursor
Menezes, Prashanth W.,Yao, Shenglai,Beltrán-Suito, Rodrigo,Hausmann, J. Niklas,Menezes, Pramod V.,Driess, Matthias
supporting information, p. 4640 - 4647 (2021/02/05)
Identifying novel classes of precatalysts for the oxygen evolution reaction (OER by water oxidation) with enhanced catalytic activity and stability is a key strategy to enable chemical energy conversion. The vast chemical space of intermetallic phases offers plenty of opportunities to discover OER electrocatalysts with improved performance. Herein we report intermetallic nickel germanide (NiGe) acting as a superior activity and durable Ni-based electro(pre)catalyst for OER. It is produced from a molecular bis(germylene)-Ni precursor. The ultra-small NiGe nanocrystals deposited on both nickel foam and fluorinated tin oxide (FTO) electrodes showed lower overpotentials and a durability of over three weeks (505 h) in comparison to the state-of-the-art Ni-, Co-, Fe-, and benchmark NiFe-based electrocatalysts under identical alkaline OER conditions. In contrast to other Ni-based intermetallic precatalysts under alkaline OER conditions, an unexpected electroconversion of NiGe into γ-NiIIIOOH with intercalated OH?/CO32? transpired that served as a highly active structure as shown by various ex situ methods and quasi in situ Raman spectroscopy.
Controlled synthesis of α-FeOOH nanorods and their transformation to mesoporous α-Fe2O3, Fe3O4@C nanorods as anodes for lithium ion batteries
Wang, Jin,Li, Linlin,Wong, Chui Ling,Sun, Linfeng,Shen, Zexiang,Madhavi, Srinivasan
, p. 15316 - 15326 (2013/09/02)
α-FeOOH nanorods with varying lengths of 200-500 nm and axis ratios of 2-8 have been successfully synthesized by a simple hydrothermal method with different amounts of hydrazine. Hierarchical nanostructured mesoporous α-Fe2O3 and Fe3O4@C, which combined both mesoporosity and carbon coating, were fabricated by transformation of these α-FeOOH nanorods. The mechanism of formation has been described in detail. The α-FeOOH, mesoporous α-Fe2O3 and Fe3O4@C samples with the longest nanorods exhibited excellent cycle and rate performance, as the long nanorods could ensure many fast and convenient electron transport pathways, thus enhancing the electronic conductivity. The as-synthesized mesoporous α-Fe2O3 and Fe3O4@C nanorods showed large specific surface area and porosity due to the inner mesoporous structure, effectively increasing the contact area between the electrode materials and electrolyte, shortening the diffusion length of Li+ and alleviating the stress from volume changes during the charge-discharge process. Mesoporous Fe3O 4@C nanorods exhibit high reversible capacities of 1072 mAh g -1 after 50 cycles, demonstrating the superior electron transport and fast Li+ diffusion ability combination of outer carbon layer and mesoporous microstructure. The Royal Society of Chemistry 2013.
Aqueous composition containing high purity iron oxide
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Page 2, (2008/06/13)
An aqueous composition comprising water and high purity iron oxide preferably including a preservative is described. The composition is useful as a coloration ingredient in pharmaceuticals, cosmetics, foods, pet foods, and tobacco products which can be incorporated as a liquid conveniently into system of customers that desire a liquid high purity iron oxide ingredient or have been convinced to change from a dry high purity iron oxide ingredient to obtain the benefits of a liquid system.
