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以Keggin型多金属氧酸盐磷钨酸为前驱体通过溶胶-凝胶法合成功能性纳米结构

Functional Nanostructures from Sol-Gel Synthesis Using Keggin Polyoxometallate Phosphotungstic Acid as a Precursor.

作者信息

Greijer Björn, De Turck Wannes, Daniel Geoffrey, Saha Jayeeta, Johnsson Mats, Seisenbaeva Gulaim A, Kessler Vadim

机构信息

Department of Molecular Sciences, Swedish University of Agricultural Sciences, Box 7015, Uppsala 75007, Sweden.

Department of Forest Biomaterials and Technology, Swedish University of Agricultural Sciences, Box 756 51, Uppsala 75007, Sweden.

出版信息

Inorg Chem. 2024 Feb 19;63(7):3428-3435. doi: 10.1021/acs.inorgchem.3c04122. Epub 2024 Feb 7.

DOI:10.1021/acs.inorgchem.3c04122
PMID:38324263
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC10880052/
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 μm 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(HO)PWO, 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.

摘要

将磷钨酸溶液置于低pH值环境并引入多价阳离子，会导致形成尺寸约为2μm的纳米结构微球，扫描电子显微镜显示，这些微球在中性和高pH值下几乎不溶且抗降解。透射电子显微镜和原子力显微镜显示，这些微球由直径约20nm的次级纳米球组成。对该过程潜在中间体酸性镧磷钨酸盐La(HO)PWO晶体结构的研究表明，存在紧密的氢键网络，使磷钨酸阴离子能够更紧密堆积，从而证实了观察到的自组装过程的机制。这种新材料在析氧反应中表现出良好的电化学性能，所获得的电极材料具有高稳定性。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ec8e/10880052/cf1278fd7abd/ic3c04122_0006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ec8e/10880052/1735e8e0ac97/ic3c04122_0001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ec8e/10880052/1c7bf0df9495/ic3c04122_0002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ec8e/10880052/fea6d5ebcc42/ic3c04122_0003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ec8e/10880052/8dae28b78563/ic3c04122_0004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ec8e/10880052/661721e0704d/ic3c04122_0005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ec8e/10880052/cf1278fd7abd/ic3c04122_0006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ec8e/10880052/1735e8e0ac97/ic3c04122_0001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ec8e/10880052/1c7bf0df9495/ic3c04122_0002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ec8e/10880052/fea6d5ebcc42/ic3c04122_0003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ec8e/10880052/8dae28b78563/ic3c04122_0004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ec8e/10880052/661721e0704d/ic3c04122_0005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ec8e/10880052/cf1278fd7abd/ic3c04122_0006.jpg

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