☆ 4.1 Article

Mg3[M(CN)6]2•xH2O with M = Fe, Co: Synthesis, Crystal Structure, and Hydrogen Sorption

ZEITSCHRIFT FUR ANORGANISCHE UND ALLGEMEINE CHEMIE (2012)

Journal

ZEITSCHRIFT FUR ANORGANISCHE UND ALLGEMEINE CHEMIE

Volume 638, Issue 7-8, Pages 1146-1150

Publisher

WILEY-V C H VERLAG GMBH

DOI: 10.1002/zaac.201200028

Keywords

Kewords: Prussian blue analogues; Porous solids; Hydrogen storage; Crystal structure; Magnesium

Funding

CONACyT [2009-01-129048, 2010-01-155413, 2011-163000]

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Abstract

The titled materials were obtained neutralizing in situ prepared aqueous solutions of H3[M(CN)6] (M = Fe, Co) by adding Mg(OH)2 and evaporating the solvent under vacuum. Their crystal structure was solved and refined from powder X-ray diffraction data. The two solids crystallize with a cubic unit cell, in the Pm$\bar{3}$m space group, which corresponds to an ordered distribution of [M(CN)6] vacancies. The materials structure is preserved when the crystal water is removed by moderated heating. The formed open porous framework was evaluated from nitrogen and hydrogen adsorption isotherms. The amount of hydrogen adsorbed is similar to that found for transition metal Prussian blue analogues. The structural study was complemented with infrared, thermo-gravimetric, and Mossbauer spectroscopy data.

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Combination of porous Co9S8-NC derived from Prussian blue analogue and RGO as effective electrochemical hydrogen storage material

Jinyou Fei, Siqi Li, Miao Han, Yugang Su, Hongsheng Jia

Summary: The Prussian blue analogue Co3[Co(CN)6]2 (CoCo-PBA) nanoparticles with three-dimensional cubic structure and uniform size are prepared using the precipitation method. The porous Co9S8/N-doped carbon (Co9S8-NC) nanostructure is fabricated via heat treatment and sulfidation processes using CoCo-PBA as the precursor. The porous Co9S8-NC is mixed with RGO by ball milling to enhance the conductivity and electrocatalytic activity. During the electrochemical hydrogen storage test, the porous Co9S8-NC exhibits higher discharge capacity than conventional Co9S8. The conductivity of Co9S8 is enhanced due to the existence of N-doped carbon. The special porous structure and large specific surface area derived from CoCo-PBA provide more electrochemical active sites. Moreover, the electrochemical properties further improve after RGO modification because of the outstanding characteristics of RGO. A highest discharge capacity of 640.8 mAh/g is obtained for the Co9S8-NC/RGO electrode. Additionally, the cycling stability, HRD and kinetic properties are also enhanced with the addition of RGO. As a consequence, Co9S8-NC/RGO can be regarded as a promising material for electrochemical hydrogen storage.

JOURNAL OF ENERGY STORAGE (2023)