Investigations on Electrochemical Performance of Hausmannite Manganese Oxide Nanoparticles in KOH and Na2SO4 Electrolytes for Energy Storage Applications

NANO ◽  
2021 ◽  
Author(s):  
G. Vignesh ◽  
R. Ranjithkumar ◽  
P. Devendran ◽  
N. Nallamuthu ◽  
P. Lakshmanan ◽  
...  

The hausmannite phase manganese oxide nanoparticles (NPs) were prepared by a simple chemical reflux method. Powder X-ray diffraction shows the well-crystalline structure of Mn3O4 spinel. Fourier-transform infrared spectroscopy study exhibited the Mn–O functional group vibrations in the hausmannite NPs. UV–visible spectroscopy study reveals that the optical bandgap energy of the manganese oxide nanoparticles is about 3.1[Formula: see text]eV. The scanning electron microscopy (SEM) analysis shows that the surface morphologies of the manganese oxide nanoparticles are wrinkle structures. Cyclic voltammetry studies were carried out to the electrode of Mn3O4 NPs in KOH and Na2SO4. The charge–discharge analysis and impedance spectroscopy method analysis were made on Mn3O4 NPs to understand the electrochemical performance. The ability of synthesized Mn3O4 NPs electrodes was analyzed and compared with the existing materials for the supercapacitor applications.

2020 ◽  
Vol 21 (2) ◽  
pp. 190
Author(s):  
Sri Rahayu ◽  
Netti Herawati ◽  
Mohammad Wijaya

Telah dilakukan penelitian tentang sintesis nanopartikel mangan oksida menggunakan prekursor KMnO4 dengan metode sol gel, dengan menambahkan aditif etilendiamin dan etilen glikol yang berperan sebagai agen penstabil, selanjutnya menguji aktivitas katalitik dari mangan oksida tersebut terhadap proses degradasi warna rhodamin B. Penelitian ini bertujuan untuk mengetahui pengaruh penambahan zat aditif terhadap ukuran dan bentuk nanopartikel yang dihasilkan serta kemampuannya sebagai katalis dalam proses degradasi zat warna rhodamin B. Nanopartikel yang diperoleh, dikarakterisasi menggunakan XRD (X-Ray Diffraction) dan SEM (Scanning Elektron Microscope) serta penentuan aktivitas katalitik dalam proses degradasi terhadap zat warna rhodamin B dengan spektrofotometer UV-Vis. Hasil penelitian menunjukkan sintesis nanopartikel menggunakan aditif etilendiamin lebih baik dibandingkan dengan aditif etilen glikol karena ukuran nanopartikel berkisar antara 5,66-33,38 dalam bentuk tetragonal. Morfologi nanopartikel mangan oksida terlihat berbentuk bulat yang seragam. Nanopartikel mangan oksida hasil sintesis mampu mempercepat proses degradasi warna rhodamin B dengan persentase degradasi mencapai 85,6%. Kata kunci: Nanopartikel, Mangan Oksida , Sol gel dan Rhodamin B ABSTRACT Research has been carried out on the synthesis of manganese oxide nanoparticles using KMnO4 precursors with the sol gel method, by adding ethylenediamine and ethylene glycol additives which act as stabilizing agents, then tested the catalytic activity of the manganese oxide on the degradation process of Rhodamine B. This study aims to determine the effect of adding substances additives on the size and shape of the nanoparticles were produced and their ability as catalysts in the degradation process of Rhodamin B. Nanoparticles were obtained, characterized using XRD (X-Ray Diffraction)and SEM (Scanning Elektron Microscope)and determination of catalytic activity in the degradation process of rhodamine B dyes with UV-Vis spectrophotometer. The results showed that the synthesis of nanoparticles using ethylenediamine additives was better than ethylene glycol additives because the size of the nanoparticles ranged from 5.66 to 33.38 in the tetragonal form. The morphology of manganese oxide nanoparticles looks uniform in shape. Manganese oxide nanoparticles can accelerate the degradation process of Rhodamin B with a percentage of degradation reaching 85.6%. Keywords: Nanoparticles, Manganese Oxide, Sol gel and Rhodamin B


2017 ◽  
Vol 28 (15) ◽  
pp. 155403 ◽  
Author(s):  
Sajad Yazdani ◽  
Raana Kashfi-Sadabad ◽  
Alessandro Palmieri ◽  
William E Mustain ◽  
Michael Thompson Pettes

2021 ◽  
Author(s):  
Wanru Sun ◽  
Hui Yu ◽  
Deqiang Wang ◽  
Youjie Li ◽  
Baocheng Tian ◽  
...  

Well-defined flower-shaped manganese oxide nanoparticles modified with 3-aminopropyltriethoxysilane (APTES) and loaded with Ce6 were achieved to realize synergistic PDT/PTT therapy and MR imaging.


Nanoscale ◽  
2014 ◽  
Vol 6 (1) ◽  
pp. 293-299 ◽  
Author(s):  
Benedict You Wei Hsu ◽  
Miao Wang ◽  
Yu Zhang ◽  
Vimalan Vijayaragavan ◽  
Siew Yee Wong ◽  
...  

2017 ◽  
Vol 7 (2) ◽  
pp. 123-131 ◽  
Author(s):  
Vineet Kumar ◽  
Kulvinder Singh ◽  
Shaily Panwar ◽  
Surinder Kumar Mehta

2011 ◽  
Vol 172 (1) ◽  
pp. 219-229 ◽  
Author(s):  
Kaushik Gupta ◽  
Sayan Bhattacharya ◽  
Dhrubajyoti Chattopadhyay ◽  
Aniruddha Mukhopadhyay ◽  
Harishankar Biswas ◽  
...  

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