Controlled syntheses of monodispersed metal oxide nanocrystals from bulk metal oxide materials

CrystEngComm ◽  
2020 ◽  
Vol 22 (28) ◽  
pp. 4790-4796
Author(s):  
Kaixuan Zhao ◽  
Zhijie Yang ◽  
Huiying Wei ◽  
Jinxin Guo ◽  
Yanzhao Yang ◽  
...  
Keyword(s):  
Metal Oxide ◽  
Metal Oxides ◽  
Boiling Point ◽  
Oxide Materials ◽  
High Quality ◽  
Bulk Metal ◽  
High Boiling Point ◽  
Quality Metal

High quality metal oxides nanocrystals are synthesized from bulk metal oxides in the presence of surfactants and high boiling point solvent.

scholarly journals Thermochemical Energy Storage Performance Analysis of (Fe,Co,Mn)Ox Mixed Metal Oxides

Catalysts ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 362
Author(s):  
Yabibal Getahun Dessie ◽  
Qi Hong ◽  
Bachirou Guene Lougou ◽  
Juqi Zhang ◽  
Boshu Jiang ◽  
...  
Keyword(s):  
Energy Storage ◽  
Metal Oxide ◽  
Metal Oxides ◽  
Redox Reaction ◽  
Gas Flow ◽  
Oxygen Exchange ◽  
Engineering Industry ◽  
Oxide Material ◽  
Oxide Materials ◽  
Uptake Ratio

Metal oxide materials are known for their ability to store thermochemical energy through reversible redox reactions. Metal oxides provide a new category of materials with exceptional performance in terms of thermochemical energy storage, reaction stability and oxygen-exchange and uptake capabilities. However, these characteristics are predicated on the right combination of the metal oxide candidates. In this study, metal oxide materials consisting of pure oxides, like cobalt(II) oxide, manganese(II) oxide, and iron(II, III) oxide (Fe3O4), and mixed oxides, such as (100 wt.% CoO, 100 wt.% Fe3O4, 100 wt.% CoO, 25 wt.% MnO + 75 wt.% CoO, 75 wt.% MnO + 25 wt.% CoO) and 50 wt.% MnO + 50.wt.% CoO), which was subjected to a two-cycle redox reaction, was proposed. The various mixtures of metal oxide catalysts proposed were investigated through the thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), energy dispersive X-ray (EDS), and scanning electron microscopy (SEM) analyses. The effect of argon (Ar) and oxygen (O2) at different gas flow rates (20, 30, and 50 mL/min) and temperature at thermal charging step and thermal discharging step (30–1400 °C) during the redox reaction were investigated. It was revealed that on the overall, 50 wt.% MnO + 50 wt.% CoO oxide had the most stable thermal stability and oxygen exchange to uptake ratio (0.83 and 0.99 at first and second redox reaction cycles, respectively). In addition, 30 mL/min Ar–20 mL/min O2 gas flow rate further increased the proposed (Fe,Co,Mn)Ox mixed oxide catalyst’s cyclic stability and oxygen uptake ratio. SEM revealed that the proposed (Fe,Co,Mn)Ox material had a smooth surface and consisted of polygonal-shaped structures. Thus, the proposed metallic oxide material can effectively be utilized for high-density thermochemical energy storage purposes. This study is of relevance to the power engineering industry and academia.

Controllable growth of high-quality metal oxide/conducting polymer hierarchical nanoarrays with outstanding electrochromic properties and solar-heat shielding ability

2014 ◽  
Vol 2 (33) ◽  
pp. 13541-13549 ◽  
Author(s):  
Dongyun Ma ◽  
Guoying Shi ◽  
Hongzhi Wang ◽  
Qinghong Zhang ◽  
Yaogang Li
Keyword(s):  
Metal Oxide ◽  
Conducting Polymer ◽  
High Quality ◽  
Electrochromic Properties ◽  
Solar Heat ◽  
Controllable Growth ◽  
Heat Shielding ◽  
Quality Metal

High-quality metal oxide/conducting polymer hierarchical nanoarrays with excellent electrochromic performances and solar-heat shielding ability are prepared using a powerful solution-based method.

Tailoring Sol-Gel Transition Processes for the Design of Novel Shape Metal Oxide Materials

2010 ◽  
Vol 1256 ◽  
Author(s):  
Martin Jarvekulg ◽  
Raul Välbe ◽  
Kathriin Utt ◽  
Martin Timusk ◽  
Tanel Tätte
Keyword(s):  
Liquid Crystal ◽  
Metal Oxide ◽  
Metal Oxides ◽  
Sol Gel ◽  
Metal Alkoxide ◽  
Oxide Materials ◽  
Sheet Rolling ◽  
Sol Gel Transition ◽  
Transformation Processes ◽  
Gel Transition

AbstractIn present paper we describe some unconventional adaptions of sol-gel method. Controlled sol-gel transformation processes of metal alkoxide based systems can lead to various novel shapes of metal alkoxide materials. Formation of different structures like tubular microstructures by gel sheet rolling, nano- and microfibres by direct drawing, as well as microtubes of metal oxides and gel dispersed liquid crystal materials are described. Different aspects of sol-gel processes leading to the formation of all of these structures are thereby discussed.

An overview of metal oxide materials as electrocatalysts and supports for polymer electrolyte fuel cells

2014 ◽  
Vol 7 (8) ◽  
pp. 2535-2558 ◽  
Author(s):  
Zhonghua Zhang ◽  
Jie Liu ◽  
Junjie Gu ◽  
Liang Su ◽  
Lifeng Cheng
Keyword(s):  
Fuel Cells ◽  
Metal Oxide ◽  
Metal Oxides ◽  
Polymer Electrolyte ◽  
Polymer Electrolyte Fuel Cells ◽  
Oxide Materials ◽  
Reduction Reactions ◽  
Co Catalysts ◽  
Anode Oxidation ◽  
Cathode Reduction

In this review, we discuss the use of binary and multi-component metal oxides as independent electrocatalysts, co-catalysts and supports for various anode oxidation and cathode reduction reactions in polymer electrolyte fuel cells.

High-Quality Metal Oxide Core/Shell Nanowire Arrays on Conductive Substrates for Electrochemical Energy Storage

ACS Nano ◽  
2012 ◽  
Vol 6 (6) ◽  
pp. 5531-5538 ◽  
Author(s):  
Xinhui Xia ◽  
Jiangping Tu ◽  
Yongqi Zhang ◽  
Xiuli Wang ◽  
Changdong Gu ◽  
...  
Keyword(s):  
Energy Storage ◽  
Metal Oxide ◽  
Nanowire Arrays ◽  
Electrochemical Energy Storage ◽  
Core Shell ◽  
High Quality ◽  
Conductive Substrates ◽  
Quality Metal ◽  
Electrochemical Energy

A strategy towards macroporous sponge-like networks of metal oxide-surfactant mesophases and bulk metal oxides

2007 ◽  
Vol 15 (6) ◽  
pp. 679-683 ◽  
Author(s):  
Gia-Thanh Vuong ◽  
Serge Kaliaguine ◽  
Trong-On Do
Keyword(s):  
Metal Oxide ◽  
Metal Oxides ◽  
Bulk Metal

Improving sol-gel Yba2Cu3O7−δ film morphology using high-boiling-point solvents

2002 ◽  
Vol 17 (8) ◽  
pp. 1900-1903 ◽  
Author(s):  
J. T. Dawley ◽  
P. G. Clem ◽  
M. P. Siegal ◽  
D. R. Tallant ◽  
D. L. Overmyer
Keyword(s):  
Critical Current Density ◽  
Boiling Point ◽  
Sol Gel ◽  
Film Morphology ◽  
High Quality ◽  
Proper Selection ◽  
Ybco Films ◽  
Superconducting Wires ◽  
Sol Gel Process ◽  
High Boiling Point

The effect of high-boiling-point solvent addition on the morphology of low-p(O2) processed, sol-gel YBa2Cu3O7−δ (YBCO) films is discussed. Proper selection and addition of a high-boiling-point solvent prevents film roughening during precursor pyrolysis, while permitting at least a tenfold reduction in pyrolysis time compared to standard film processing in air or O2. Use of such solvents appears to increase film plasticity, avoiding elastic compressive stress related buckling. High-quality YBCO films on 〈100〉 LaAlO3 with a critical current density (Jc) ∼ 3–4 MA/cm2 at 77 K, are routinely crystallized with this new sol-gel process. Diethanolamine-based, sol-gel YBCO films deposited on sol-gel SrTiO3-buffered 〈100〉 Ni have Jc(77 K) > 1 MA/cm2, demonstrating a route toward all-sol-gel superconducting wires.

Low temperature and rapid formation of high quality metal oxide thin film via a hydroxide-assisted energy conservation strategy

2018 ◽  
Vol 6 (37) ◽  
pp. 9941-9949 ◽  
Author(s):  
Meng-Huan Jao ◽  
Chien-Chen Cheng ◽  
Chun-Fu Lu ◽  
Kai-Chi Hsiao ◽  
Wei-Fang Su
Keyword(s):  
Metal Oxide ◽  
Conservation Strategy ◽  
Oxide Thin Film ◽  
High Quality ◽  
Metal Oxide Thin Films ◽  
Thermal Budget ◽  
Rapid Formation ◽  
Metal Oxide Thin Film ◽  
Low Thermal Budget ◽  
Quality Metal

We develop a universal hydroxide-assisted strategy for the low thermal budget efficient fabrication of high quality metal oxide thin films.

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