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Hayat Majid,Ali Bakhat,Yunis Muhammad,Al-Sehemi Abdullah G.,Messali Mouslim,Manzoor Sumaira,Abdullah Muhammad,Alanazi Meznah M.,Abdelmohsen Shaimaa A. M.,Ashiq Muhammad Naeem 한국세라믹학회 2023 한국세라믹학회지 Vol.60 No.4
There is a persistent imbalance between energy demand and supply since renewable energy sources are intermittent. A potential answer to this ongoing problem is the development of suitable materials that could be utilized in storage energy devices. Among all the devices, supercapacitors with effficient electrode material are one of the possible storage technologies. Here in the present work, a cerium selenide/reduced graphene oxide (CeSe/rGO) heterostructure-based electrode is fabricated via hydrothermal technique. The synthesized CeSe/rGO performs well with 810.45 F g −1 specific capacitance at 1.5 A g −1, and an exceptional rate of capability with negligible instability up to 5000th cycles. Additionally, the probable contribution of rGO to the composite's ability to increase supercapacitance through synergy effect of CeSe and rGO has been observed. EIS (Electrochemical impedance spectroscopy) was exploited to fi nd out the mechanism of charge transmission for the fabricated material. The electrochemical analysis indicates that CeSe/rGO exhibited the superior performance than the apparently cutting-edge structures.
Malik Abdul Rub,Naved Azum,Farah Khan,Abdullah G. Al-Sehemi,Abdullah M. Asiri 한국화학공학회 2015 Korean Journal of Chemical Engineering Vol.32 No.10
We studied the influence of cationic hydrotrope aniline hydrochloride on the micellization behavior of cationic amphiphilic phenothiazine drug promazine hydrochloride in the presence and absence of 50mmol kg−1 NaCl. The experimental critical micelle concentration (CMC) values came out to be lower than ideal CMC (CMCid) values, signifying attractive interactions between the two components in mixed micelles. NaCl further decreases the CMC of pure PMZ and aniline hydrochloride as well as their mixture due to screening of the electrostatic repulsion among the polar head groups. The bulk properties of solution were examined by using different theoretical models for justification and comparison of results. The micellar mole fraction of aniline hydrochloride (X1 Rub, X1 M, X1 Rod and X1 id) was evaluated by different proposed models, showing greater contribution of hydrotrope in mixed micelle. The negative values of interaction parameter (β) indicate synergistic interactions and negative values of β further decrease by the addition of salt in mixed systems. From the CMC values as a function of temperature, various thermodynamic properties have been evaluated and discussed in detail.
Asif Mahmood,Mudassir HussainTahir,Ahmad Irfan,Bilal Khalid,Abdullah G. Al-Sehemi 대한화학회 2015 Bulletin of the Korean Chemical Society Vol.36 No.11
In this paper, we present the design of five new derivatives of triphenylamine dyes with variable thiophene rings (0–5) and shed light on their electrooptical and charge-injection properties. Computational techniques are used to study the effect of the thiophene moieties on the properties of interest, i.e., how the number of thiophene rings in π-conjugated systems influence the absorption spectra and electron injection of the dyes. The results show that the absorption spectra gradually became broad and red-shifted (384–542 nm) with the number of thiophene units. The effect of thiophene units on the performance of sensitizers in dye-sensitized solar cells is also determined. During theoretical examination, the electron injection efficiency (Φinject) and light harvesting efficiency (LHE) are determined. Results indicate that the selection of appropriate lengths of conjugated bridges in the dye sensitizer is very important in designing high-efficiency dyes.