Search

لقد ارتبطت الغازات الخطيرة بشكل كبير بالتحيز ضد حياة الإنسان داخل البيئة. تطور حساس الغاز الموثوق به ذو ارتفاع تعتبر الاستجابة ذات أهمية كبيرة للكشف عن الغازات الخطرة المختلفة. التيتانيوم تعتبر أنابيب ثاني أكسيد الكربون (TiO2) النانوية (TNTs) من المرشحين المفضلين ذوي الإمكانات الكبيرة والأداء الممتاز في تطبيقات استشعار الغاز. لقد قمنا في هذا العمل بدراسة تأثير الجهد على تحضير مصفوفات TiO2 النانوية عبر تقنية الأنودة لتطبيقات استشعار الغاز. تم استخدام نهج أنودة الكهروكيميائية بسيط لتصنيع أنابيب ثاني أكسيد التيتانيوم النانوية. كانت هناك تقنيات متنوعة للتوصيف تستخدم لتقييم TNTs. النتائج المكتسبة من مسح الإلكترون بالانبعاث الميداني الفحص المجهري (FESEM)، التحليل الطيفي لتشتت الطاقة (EDS)، وحيود الأشعة السينية تشير (XRD) إلى تشكل TiO2. تم إنشاء أجهزة استشعار الغاز، والكشف عن الغاز تم توجيه الخصائص نحو كبريتيد الهيدروجين (H2S) وهو غير صحي غاز. يستجيب المستشعر المصنوع من هذه الأنابيب النانوية جيدًا لهذا الغاز بدرجات مختلفة درجات الحرارة ولها حساسية عالية. وكانت خصائص الكشف عن H2S تم تقييمها بقيم تتراوح من درجة حرارة الغرفة حتى 300 درجة مئوية. تظهر النتائج ذلك إن أجهزة استشعار الغاز TNTs التي تم إعدادها عند 30 فولت لاستشعار غاز H2S لديها الأعلى الحساسية وأقصر زمن استجابة في درجة حرارة الغرفة. [ABSTRACT FROM AUTHOR]

Prior to the start of production, several factors must be considered, including the price, effectiveness, and environmental friendliness of batteries. Ionic liquids and deep eutectic solvents have shown significant success when employed as electrolytes with Titanium-graphite cells, especially when combined with additives that enhance their conductivity by reducing the high viscosity of these liquids. Evaluating the discharge voltage of the AlCl3-chloroacetamide IL with DCM as an additive revealed a voltage of 1.16V and an internal resistance of 11 Ohm. These electrochemical cells exhibited an intriguing response. Otherwise, when utilizing CaCl2.2H2O: Acetamide DES with DI water as an additive, the cell voltage measured 0.97V, with an internal resistance of 23 Ohm. Moreover, these cells demonstrated thermal stability during both charging and discharging processes, which can be attributed to the concentration and quality of the ionic species. Furthermore, the surfaces of the Titanium electrodes were examined using FESEM and EDXA equipment to assess the impact of the ionic liquid and DES on these electrodes. [ABSTRACT FROM AUTHOR]

Copyright of Iraqi Journal of Physics is the property of Republic of Iraq Ministry of Higher Education & Scientific Research (MOHESR) and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The use of nanostructure has mainly been explored as a photoanode; however, lately, they have gained interest in photoelectrochemical applications due to tunable band gaps and long electron lifetimes achieved via structure control. In this work, we have investigated the influence of manganese concentration on the deposit of Mn nanoparticles on CdS nanoparticles as a sensitizing coat in photoelectrochemical applications using titanium dioxide nanotubular arrays prepared through the anodization technique. The manganese nanoparticles were synthesized and electrochemically deposited onto cadmium sulfide/titanium dioxide nanotube. Diverse characterization techniques indicate the successful incorporation of Mn nanoparticles within CdS nanoparticles and TiO2 nanotubes. The effect of manganese concentration on the photocurrent performance was inspected, and the optimal combination was found to be 7 mM of Mn deposited onto CdS /TiO2 nanotube. The addition of Mn nanoparticles to CdS and TiO2 nanotubes was found in order to improve the photoelectrochemical performance by increasing absorption in the visible region. [ABSTRACT FROM AUTHOR]

The synthesis of bismuth (III) sulphide (Bi2S3)-sensitized titanium dioxide nanotubes arrays (TiO2 NTAs) was carried out using the SILAR (successive ionic layer adsorption and reaction) method. The effect of different cycles on the performance of a photoanode made of Bi2S3/TiO2 NTAs in photoelectrochemical cells was investigated. Field-emission scanning electron microscopy, energy-dispersive X-ray spectroscopy, X-ray diffraction (XRD), Fourier transform infrared spectroscopy and UV–visible spectroscopy were used to investigate Bi2S3/TiO2 NTs morphological, elemental composition, structural and optical absorption, respectively. TiO2 nanotubes had a tetragonal crystal structure, whereas Bi2S3 had an orthorhombic crystal structure, according to XRD measurements. Absorbance spectra showed that the absorbance edges shifted towards longer wavelengths as the number of cycles increased, showing that the optical properties had significantly improved following deposition. Bi2S3/TiO2 NTAs photoanode was proposed as a viable alternative photoanode in photoelectrochemical applications. The photocurrent density of the Bi2S3/TiO2 NTAs composite film grew first, then declined as the number of Bi2S3 deposition cycles increased. After three cycles of deposition of Bi2S3, the Bi2S3/TiO2 composite films displayed the highest photoelectrochemical characteristics. The photocurrent density of Bi2S3-3Cy/TiO2 NTAs was 1.427 mA cm–2, about four times that of plain TiO2 NTAs. The Bi2S3/TiO2 NTAs photoanode was offered as a feasible alternative photoanode in photoelectrochemical applications based on the findings of this study. [ABSTRACT FROM AUTHOR]

This research focuses on improving the photoelectrochemical performance of binary heterostructure Ag2S/ZnO NRs/ITO by manipulating synthesis conditions, particularly the concentrations of sliver nitrate AgNO3 and thiourea CS(NH2)2. The photoelectrochemical performance of Ag2S/ZnO nanorods on indium tin oxide (ITO) nanocomposite was compared to pristine ZnO NRs/ITO photoanode. The hydrothermal technique, an eco-friendly, low-cost method, was used to successfully produce Ag2S/ZnO NRs at different concentrations of AgNO3 and CS(NH2)2. The obtained thin films were characterized using field emission scanning electron microscopy (FESEM), energy-dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD), ultraviolet-visible spectroscopy (UV-vis), and photoelectrochemical studies (PECs). We observed that there was an enhancement in absorbance in the visible region and effective photoelectron transfer between the Ag2S/ZnO NRs/ITO photoelectrode and the electrolyte Red-Ox when illuminated with 100 mW cm−2. Increasing the concentration of AgNO3 caused a remarkable decrease in the optical bandgap energy (Eg) values. However, we noticed that there was an unstable trend in Eg when the concentration of CS(NH2)2 was adjusted. The photoelectrochemical studies revealed that at a bias of 1.0 V, and 0.005 M of AgNO3 and 0.03 M of CS(NH2)2, the maximum photocurrent of the Ag2S/ZnO NRs/ITO photoanode was 3.97 mA/cm2, which is almost 11 times that of plain ZnO nanorods. Based on the outcomes of this investigating, the Ag2S/ZnO NRs/ITO photoanode is proposed as a viable alternative photoanode in photoelectrochemical applications. [ABSTRACT FROM AUTHOR]

Surface alteration of titanium dioxide nanotube arrays by semiconductor and metal is one of the pathways to narrow the wide bandgap of titanium dioxide and thereby increase its absorption in the visible region. Cu-CdSe-cosensitized titanium dioxide nanotube arrays (Cu-CdSe/TiO2 nanotube) have been produced for use as photoanodes in photoelectrochemical cells. Ordered Cu-CdSe/TiO2 nanotubes were successfully prepared by varying the deposition time (1 min to 4 min) using a facile three-step electrochemical method. The composition, morphological structure, and visible-light response were characterized by field-emission scanning electron microscopy, x-ray diffraction (XRD) analysis, energy-dispersive x-ray spectroscopy, ultraviolet–visible (UV–Vis) diffusion reflection spectroscopy (DRS), and photoelectrochemical testing. XRD analysis demonstrated that sensitization using Cu-CdSe did not destroy the structure of the anatase-phase nanotube arrays, with the formation of copper nanoparticles composed of cubic-like particles with increasing deposition time. UV–Vis DRS of the Cu-CdSe/TiO2 nanotubes revealed a red-shift of the photoresponse towards the visible-light region, characterized by bandgap narrowing and improved photoefficiency. The optimal photoelectrochemical performance was observed when depositing Cu nanoparticles for 1 min, surpassing that of pristine titania nanotube arrays and other materials prepared under different conditions. The features of these photoanodes for many applications include easy synthesis, low cost, high efficiency for visible lighting, and good stability. The present work demonstrates a feasible modification of TiO2 nanotubes with Cu-CdSe to form potential photoanodes for solar conversion devices. [ABSTRACT FROM AUTHOR]

Copyright of Al-Mustansiriyah Journal of Science is the property of Republic of Iraq Ministry of Higher Education & Scientific Research (MOHESR) and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Baghdad Science Journal is the property of Republic of Iraq Ministry of Higher Education & Scientific Research (MOHESR) and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

In this study, a composite material, manganese oxide/reduced titania nanotubes (Mn 2 O 3 /R-TNTs), was synthesized through incorporation of Mn 2 O 3 onto R-TNTs via the reverse pulse electrodeposition technique. The influence of pulse reverse duty cycles on the morphological, structural and electrochemical performance of the surface was studied by varying the applied duty cycle from 10% to 90% for 5 min total on-time at an alternate potential of -0.90 V ( E on ) and 0.00 V ( E off ). FESEM analysis revealed the uniform deposition of Mn 2 O 3 on the circumference of the nanotubes. The amount of Mn 2 O 3 loaded onto the R-TNTs increased as a higher duty cycle was applied. Cyclic voltammetry and galvanostatic charge-discharge tests were employed to elucidate the electrochemical properties of all the synthesized samples in 1 M KCl. The specific capacitance per unit area was greatly enhanced upon the incorporation of Mn 2 O 3 onto R-TNTs, but showed a decrease as a high duty cycle was applied. This proved that low amounts of Mn 2 O 3 loading enhanced the facilitation of the active ions for charge storage purposes. The optimized sample, Mn 2 O 3 /R-TNTs synthesized at 10% duty cycle, exhibited high specific capacitance of 18.32 mF cm -2 at a current density of 0.1 mA cm -2 obtained from constant current charge-discharge measurements. This revealed that the specific capacitance possessed by Mn 2 O 3 /R-TNTs synthesized at 10% duty cycle was 6 times higher than bare R-TNTs., Competing Interests: The authors declare that there is no conflict of interest regarding the publication of this paper., (This journal is © The Royal Society of Chemistry.)