Fuel Cell Based on Novel Hyper-Branched Polybenzimidazole Membrane

Changzhi Liu,Sher Bahadar Khan,이민주,김광인,Kalsoom Akhtar,한학수,Abdullah M. Asiri 한국고분자학회 2013 Macromolecular Research Vol.21 No.1

A novel hyper-branched polybenzimidazole (HB-PBI) has been synthesized and efficiently utilized as a conducting polymer for the fabrication of an efficient high temperature fuel cell. The developed fuel cell showed outstanding proton conductivity (0.168 Scm-1 at 150 ºC) along with excellent single cell performance, displaying a maximum power density of 0.346 Wcm-2. The HB-PBI has been synthesized by polymerization of bibenzimidazole diterephthalic acid (BBIDTA) and 3,3'-diaminobenzene in the presence of poly phosphoric acid while the BBIDTA was synthesized by treating trimellitic anhydride with 3,3'-diaminobenzene. Both HB-PBI and BBIDTA were structurally characterized by nuclear magnetic resonance (1H and 13C NMR). HB-PBI showed high thermal stability and mechanical properties, findings that were corroborated by thermogravimetric analysis and use of a universal testing machine. Additionally, proton conduction and the thermal and mechanical properties of HB-PBI were compared with polybenzene imidazole (m-PBI), and found that HB-PBI has higher proton conducting, thermal and mechanical properties.

Synthesis, Characterization, Absorbance, Fluorescence and Non Linear Optical Properties of Some Donor Acceptor Chromophores

Asiri, Abdullah M.,Khan, Salman A.,Al-Amoudi, Muhammed S.,Alamry, Kalid A. Korean Chemical Society 2012 Bulletin of the Korean Chemical Society Vol.33 No.6

Three carbazole chromophores featuring dicyano, cyano, ethyl acetate and dimethyl acetate groups as an acceptor moiety with a ${\pi}$-conjugated spacer and $N$-methyl dibenzo[$b$]pyrole as donor were synthesized by Knovenagel condensation and characterized by IR, $^1HNMR$, $^{13}CNMR$, UV-vis, fluorescence spectroscopy, electrochemistry and theoretical B3LYP/6-$311G^*$ level whilst NLO properties and spectroscopic quantities were calculated. Calculations showed remarkable trend with HOMO located on the donor moiety and LUMO on the acceptors dicyano methylene, cyano, ethyl acetate methylene and dimethyl acetate methylene. In agreement with the calculations, solvatochromic, behavior intramolecular charge transfer band was observed in the visible region.

Synthesis, Characterization, Absorbance, Fluorescence and Non Linear Optical Properties of Some Donor Acceptor Chromophores

Abdullah M. Asiri,Salman A. Khan,Muhammed S. Al-Amoudi,Kalid A. Alamry 대한화학회 2012 Bulletin of the Korean Chemical Society Vol.33 No.6

Three carbazole chromophores featuring dicyano, cyano, ethyl acetate and dimethyl acetate groups as an acceptor moiety with a π-conjugated spacer and N-methyl dibenzo[b]pyrole as donor were synthesized by Knovenagel condensation and characterized by IR, 1HNMR, 13CNMR, UV-vis, fluorescence spectroscopy, electrochemistry and theoretical B3LYP/6-311G* level whilst NLO properties and spectroscopic quantities were calculated. Calculations showed remarkable trend with HOMO located on the donor moiety and LUMO on the acceptors dicyano methylene, cyano, ethyl acetate methylene and dimethyl acetate methylene. In agreement with the calculations, solvatochromic, behavior intramolecular charge transfer band was observed in the visible region.

Sensitive and selective heavy metal ion, Mn2+ sensor development based on the synthesized (E)-N′-chlorobenzylidene-benzenesulfonohydrazide (CBBSH) molecules modified with nafion matrix

Abdullah M. Asiri,Mohammad M. Hussain,Muhammad N. Arshad,Mohammed M. Rahman 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.63 No.-

A set of (E)-N′-chlorobenzylidene-benzenesulfonohydrazide (CBBSH) molecules were synthesized using a condensation method from the derivatives of chlorobenzaldehyde and benzenesulfonylhydrazine in a medium yield which crystallized in EtOH. CBBSH derivatives were characterized using highly refined spectroscopic techniques such as 1H NMR, 13C NMR, FT-IR, FESEM, and UV–Vis. Structure of the CBBSH compounds was confirmed using a single crystal X-ray diffraction technique (SCXRDT) and applied for the potential detection of selective heavy metal ion (HMI), manganese ion (Mn2+) by using reliable electrochemical method. A small layer of CBBSH was deposited onto a smooth GCE with coating binder in order to modify a sensitive and selective Mn2+ sensor. Analytical parameters such as sensitivity, LOD, LOQ of the modified sensor (3-CBBSH/GCE) toward Mn2+ were calculated from the calibration curve (CC) as 1270.0 pA μM−1 cm−2, ≈10.0 pM, and 335.0 mM respectively. This prospective 3-CBBSH/GCE sensor used to the selective measurement of Mn2+ in spiked real samples for example industrial effluent and various water samples (red sea, surface, and tap), and found acceptable and rational results.

Efficient electrochemical detection of L-lactic acid using platinum nanoparticle decorated Chitosan/ZnTiO3 nanocomposites

M. Faisal,M.M. Alam,Jahir Ahmed,Abdullah M. Asiri,S.A. Alsareii,Raja Saad Alruwais,Norah Faihan Alqahtani,Mohammed M. Rahman,Farid A. Harraz 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.118 No.-

Herein, a facile L-lactic acid electrochemical sensor based on Pt-nanoparticles (NPs)@Chitosan/ZnTiO3nanocomposites (NCs) coated on a glassy carbon electrode (GCE) is demonstrated. Ultra-sonicationmethod followed by irradiation using an Osram Hg-lamp was applied to prepare Pt-NPs@Chitosan/ZnTiO3 NCs, and the characterization of prepared NCs was executed by Field Emission ScanningElectron Microscopy FESEM, Energy Dispersive Spectroscopy EDS, Transmission Electron MicroscopyTEM, High Resolution Transmission Electron Microscopy HRTEM, Fourier Transform InfraredSpectroscopy FTIR, Ultraviolet–visible spectroscopy UV–vis., and X ray Diffraction XRD analysis. A linearcurrent versus potential responses relation was obtained in a concentration range of L-lactic acid of 0. 30 2.40 mM at differential pulse voltammetric (DPV) analysis in a pH 7.0 buffer medium and resultedconcentration range was defined as the dynamic detection range (LDR) for L-lactic acid analysis. The Llacticacid sensor sensitivity (0.4529 lAlM-1cm2), limit of detection (LOD; 22.36 ± 1.12 lM), and limitof quantification (LOQ; 79.88 lM) were obtained. Besides this, the sensor reproducibility and responsetime were found to be reliable. Finally, the assembled sensor probe was validated by the testing of realsamples, which exhibited acceptable and satisfied results. It is introduced a new route for the detection ofchemicals using novel nanocomposite materials by electrochemical approach for the safety of healthcarefields in a broad scales.

Carbon black co-adsorbed ZnO nanocomposites for selective benzaldehyde sensor development by electrochemical approach for environmental safety

Mohammed M. Rahman,M.M. Alam,Abdullah M. Asiri 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.65 No.-

The nanocomposites (NCs) of carbon black (CB) co-adsorbed ZnO nanomaterials were synthesized by facile wet-chemical process at low temperature. The prepared NCs were characterized by UV/vis, EDS, TEM, FTIR, EIS, XPS, and powder XRD. In this research approach, a newly developed benzaldehyde (BZH) chemical sensor with active ZnO/CB is studied by electrochemical method. A uniform thin layer of ZnO/CB NCs was deposited on a glassy carbon electrode (GCE) with conducting binder to result the working electrode for BZH chemical sensor. The proposed chemical sensor is displays good selectivity with lower detection limit, long-term stability and enhanced electrochemical responses. The calibration plot is found to be linear over the concentration (LDR) range of 0.1 nM–0.1 mM. The sensitivity (5.0633 μA μM−1 cm−2) and detection limit (18.75 ± 0.94 pM) of projected BZH chemical sensor were estimated from the slope of calibration plot. Based on sensing performance of ZnO/CB NCs/binder/GCE, this chemical sensor is introduced a well-organized route of efficient detection of hazardous and carcinogenic chemicals to safe the environmental and healthcare sectors in broad scales.

Sensitive 1,2-dichlorobenzene chemi-sensor development based on solvothermally prepared FeO/CdO nanocubes for environmental safety

Mohammed M. Rahman,M.M. Alam,Abdullah M. Asiri 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.62 No.-

In this approach, we report the assembly of a dynamic, high sensitive, selective and reproducible 1,2-dichlorobenzene (1,2-DCB) chemi-sensor development based on solvothermally prepared nanocubes (NCs) of FeO/CdO. The synthesized FeO/CdO NCs was exhibited as an excellent electron mediator during the sensing performance of 1,2-DCB in aqueous medium and this research work was executed by electrochemical method. The morphological, optical, elemental, and structural characterization of synthesized NCs were investigated by various conventional techniques such as FTIR, UV–vis, FESEM, XPS, EDS, and XRD. NCs were used to fabricate glassy carbon electrode (GCE) with nafion conducting binder. The sensitivity of proposed chemi-sensor was estimated from the slope of calibration curve attained as current versus concentration of 1,2-DCB relation. It was introduced a reliable future sensitive sensor development using FeO/CdO NCs by electrochemical approach for the probable detection of toxic 1,2-DCB and other environmental carcinogenic chemicals for the safety of environmental and health care fields.

Studies of methanol electro-oxidation with ternary wet-chemically prepared ZCSO hexagonal nanodiscs with electrochemical approach

Mohammed M. Rahman,M.M. Alam,Abdullah M. Asiri,Sulaiman Y. M. Alfaifi,Hadi M. Marwani 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.106 No.-

High performance acute toxic methanol sensor based on hydrothermally prepared hexagonal nanodiscs(NDs) of ZnO/CdO/SnO2 (ZnCdSnO2 or ZCSO) was fabricated onto glassy carbon electrode (GCE). The characterizationof ZCSO NDs in-terms of functional group analysis, binding energy evaluation, oxidationstates, optical absorbance, crystallinity, structural morphology, and elemental compositions were performedby FTIR spectroscopy, X-ray photoelectron spectroscopy (XPS), UV–visible spectroscopy, XRD,FESEM-coupled-EDS analysis respectively. The current versus concentration plot was exhibited linearon a wide range of methanol concentration (0.01 nM to 0.1 mM) clarified as linear dynamic methanoldetection range (LDR). Considering the ZCSO NDs-coated surface area onto GCE over the slope of LDR,noticeable methanol sensor sensitivity (4.5475 mA mM1 cm2) was perceived. Besides this, a considerablelower limit (7.69 ± 0.38 pM) of detection at signal/noise = 3 is obtained. The overall results of methanolchemical sensor were found with satisfactory and acceptable results in terms of their reproducibility,sensitivity, stability, and response-time. Additionally, the assembled ZCSO NDs-coated electrode was validatedwith real environmental samples and result was found good and acceptable. On considering theoutcome of applicability and the way of this sensor assembling, this unique method might be a potentialtechnique in the field of portable sensor development for the safety of environmental and healthcarefields in a broad scale.

Cu-loaded ZSM-5 zeolites: An ultra-sensitive phenolic sensor development for environmental safety

Mohammed M. Rahman,Bahaa M. Abu-Zied,Abdullah M. Asiri 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.61 No.-

Various copper loaded ZSM-5 zeolites was prepared and characterized in details of their optical, structural, morphological, elemental properties by various conventional methods. The Cu-ZSM-5 zeolites were deposited on silver electrode to result in a chemical sensor that has a fast response to selective 3-methoxyphenol (3-MP) in buffer phase. Analytical sensor parameters such as sensitivity, detection limit, reproducibility, selectivity, repeatability, linear dynamic range, and electrochemical performances were investigated in details with the Cu-ZSM-5 zeolites fabricated sensors. The calibration plot is linear over the large 3-MP concentration range. The sensitivity and detection limit of target 3-MP is calculated as ∼13.232 μA cm−2 μM−1 and 0.083 ± 0.002 nM (at a signal-to-noise-ratio, SNR of 3) respectively. With such excellent features as wide linear dynamic range, higher sensitivity, good stability, lowest detection limit, excellent selectivity, the developed sensor provides a new strategy for determination of 3-MP in biomedical and environmental sample with satisfactory results.

Low dimensional Ni-ZnO nanoparticles as marker of toxic lead ions for environmental remediation

Mohammed M. Rahman,Sher Bahadar Khan,Hadi M. Marwani,Abdullah M. Asiri,Khalid A. Alamry,Malik Abdul Rub,Anish Khan,Aftab Aslam Parwaz Khan,Abdullah H. Qusti 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.3

We have synthesized Ni-ZnO nanoparticles (NPs) by a wet-chemical route using reducing agents. Thestructural and optical properties of Ni-ZnO NPs were investigated by various conventional methods. Theanalytical potential of the Ni-ZnO NPs was studied for a selective detection of toxic Pb(II) ion usingrecognized ICP-OES method for environmental remediation. Data obtained from the selectivity studyindicated that the selectivity of Ni-ZnO NPs phase was the most toward Pb(II) ion. However, theadsorption isotherm data of Pb(II) on Ni-ZnO NPs phase was good-match with the Langmuir-Adsorption-Isotherm, strongly supporting that the adsorption process was mainly monolayer on homogeneousadsorbent surfaces.