Abstract

Subjecting phosphotungstic acid solutions to low pH in combination with introduction of polyvalent cations led to the formation of nanostructured microspheres of approximately 2 mu m in size, as shown by scanning electron microscopy, which were almost insoluble and resistant to degradation at neutral and high pH. These microspheres were composed of secondary nanospheres with diameters around 20 nm as revealed by transmission electron microscopy and atomic force microscopy. Investigations of the crystal structure of a potential intermediate of this process, namely, acidic lanthanum phosphotungstate, [La(H2O)(9)](H3O)(3)[PW12O40](2)(H2O)(19), showed a tight network of hydrogen bonding, permitting closer packing of phosphotungstic acid anions, thereby confirming the mechanism of the observed self-assembly process. The new material demonstrated promising electrochemical properties in oxygen evolution reactions with the high stability of the obtained electrode material.

Published in

Inorganic Chemistry
2024, Volume: 63, number: 7, pages: 3428-3435
Publisher: AMER CHEMICAL SOC

SLU Authors

• Greijer, Björn

  • Department of Molecular Sciences, Swedish University of Agricultural Sciences
    

• Daniel, Geoffrey

  • Department of Forest Biomaterials and Technology, Swedish University of Agricultural Sciences
    

• Seisenbaeva, Gulaim

  • Department of Molecular Sciences, Swedish University of Agricultural Sciences
    

• Kessler, Vadim

  • Department of Molecular Sciences, Swedish University of Agricultural Sciences
    

UKÄ Subject classification

Inorganic Chemistry


Publication identifier

DOI: https://doi.org/10.1021/acs.inorgchem.3c04122

Permanent link to this page (URI)

https://res.slu.se/id/publ/128722