Impact of synthesis conditions in Na-rich Prussian Blue Analogs

Paula Sanz Camacho (1, 2, 3) , Romain Wernert (1, 2, 3) , Mathieu Duttine (1) , Alain Wattiaux (1) , Ashish Rudola (4, 5) , Palani Balaya (4) , François Fauth (6) , Romain Berthelot (2, 3) , L. Monconduit (2, 3, 7) , Dany Carlier (1, 3, 7) , Laurence Croguennec (1, 3, 7)

1 ICMCB - Institut de Chimie de la Matière Condensée de Bordeaux
2 ICGM - Institut Charles Gerhardt Montpellier - Institut de Chimie Moléculaire et des Matériaux de Montpellier
3 RS2E - Réseau sur le stockage électrochimique de l'énergie
4 Department of Mechanical Engineering [Singapore]
5 Department of Material Science and Engineering
6 CELLS ALBA - CELLS ALBA synchroton = ALBA Synchrotron
7 ALISTORE-ERI - Advanced Lithium Energy Storage Systems - ALISTORE-ERI

Sodium rich iron hexacyanoferrates were prepared by coprecipitation, hydrothermal route, and under reflux, with or without dehydration. They were obtained with different structures described in cubic, orthorhombic or rhombohedral symmetry, with variable compositions in sodium, water and cationic vacancies, and with a variety of morphologies. This series of sodium rich Prussian Blue Analogs allowed to address the relationship between synthesis conditions, composition, structure, morphology and electrochemical properties in Na-ion batteries. A new orthorhombic phase with the Na 1.8 Fe 2 (CN) 6 •0.7H 2 O composition synthesized by an hydrothermal route at 140°C is reported for the first time, whereas a phase of Na 2 Fe 2 (CN) 6 •2H 2 O composition obtained under reflux, previously described with a monoclinic structure, shows in fact a rhombohedral structure.

Mots clés: Na-ion batteries; Prussian Blue Analogs; Iron hexacyanoferrates; hydrothermal synthesis; coprecipitation synthesis

Domaines: Matériaux

Paula Sanz Camacho, Romain Wernert, Mathieu Duttine, Alain Wattiaux, Ashish Rudola, et al.. Impact of synthesis conditions in Na-rich Prussian Blue Analogs. ACS Applied Materials & Interfaces, 2021, 13 (36), pp.42682-42692. ⟨10.1021/acsami.1c09378⟩. ⟨hal-03355266⟩