S. R. Ahmed^a,*, M. V. V. K. Srinivas Prasad^b, K. Keerthivasan^c

Chalcogenide Letters, Vol.22, No.8, pp. 679-691, 2025, DOI:10.15251/CL.2025.228.679

Abstract This work used a sonication-aided approach to make Cadmium sulfide nanoparticles and Nitrogen-doped CdS nanoparticles. Doping Nitrogen into CdS NPs enhances the material's electrical, chemical, and structural properties by altering its surface area and functional sites. XRD, FTIR, SEM/EDX, TGA, UV-Vis, and PSA are used to evaluate the characteristic features of CdS NPs. The photovoltaic responses of the prepared CdS and CdS-N NPs were evaluated by electrochemical impedance and IV analysis. The obtained XRD data confirms that nitrogen doping significantly changes the crystal size of CdS NPs. The XPS spectrum depicts the presence of trace More >

Thanattha Chobsilp¹, Alongkot Treetong², Visittapong Yordsri³, Mattana Santasnachok^4,5, Pollawat Charoeythornkhajhornchai⁶, Jaruvit Sukkasem⁷, Winadda Wongwiriyapan⁸, Worawut Muangrat^1,5,*

Journal of Renewable Materials, Vol.13, No.11, pp. 2155-2168, 2025, DOI:10.32604/jrm.2025.02025-0111 - 24 November 2025

Abstract Nitrogen-doped activated carbon (N-AC) was successfully prepared by KOH-activation and nitrogen doping using ammonia (NH₃) heat treatment. Coconut shell-derived activated carbon (AC) was heat-treated under NH₃ gas in the temperature range of 700°C–900°C. Likewise, the mixture of potassium hydroxide (KOH) and AC was heated at 800°C, followed by heat treatment under NH₃ gas at 800°C (hereafter referred to as KOH-N-AC800). Scanning electron microscopy (SEM), Raman spectroscopy, X-ray photoelectron spectroscopy (XPS) and Brunauer-Emmett-Teller (BET) method were utilized to analyze morphology, crystallinity, chemical bonding, chemical composition and surface area. The surface area and porosity of N-AC increased with increasing… More >

Xin Zhang^1,*, Shixing Zhang¹, Lina Chen², Jihong Zhang¹, Peihong Yang¹, Zilei Zhang¹, Xiaoming Zhang¹

Energy Engineering, Vol.122, No.9, pp. 3647-3679, 2025, DOI:10.32604/ee.2025.067035 - 26 August 2025

Abstract A park hydrogen-doped integrated energy system (PHIES) can maximize energy utilization as a system with multiple supplies. To realize win-win cooperation between the PHIES and active distribution network (ADN), the cooperative operation problem of multi-PHIES connected to the same ADN is studied. A low-carbon hybrid game coordination strategy for multi-PHIES accessing ADN based on dynamic carbon base price is proposed in the paper. Firstly, multi-PHIES are constructed to form a PHIES alliance, including a hydrogen-doped gas turbine (HGT), hydrogen-doped gas boiler (HGB), power to gas and carbon capture system (P2G-CCS), and other equipment. Secondly, a… More > Graphic Abstract

Lekaa K. Abdul Karem¹, Badriah Saad Al-Farhan², Ghada M. G. Eldin³, Samir Kamel⁴, Ahmed M. Khalil^5,*

Journal of Renewable Materials, Vol.13, No.7, pp. 1459-1473, 2025, DOI:10.32604/jrm.2025.02025-0046 - 22 July 2025

Abstract In this study, the casting process is used to fabricate modified polyvinyl alcohol (PVA), starch (S), and carboxymethyl cellulose (CMC) polymer blend films (PVA/S/CMC) loaded with various concentrations of iron-doped carbon quantum dots (Fe-CQDs) and denoted as (PVA/S/CMC@Fe-CQDs). A one-step microwave strategy was employed as a facile method to prepare Fe-CQDs. Through a series of characterization techniques, fourier-transform infrared (FTIR) spectroscopy, x-ray diffraction (XRD) analysis, and scanning electron microscopy (SEM) have been used to show the successful integration of Fe-CQDs into the PVA/S/CMC matrix. Loading the synthesized Fe-CQDs to the polymeric matrix significantly enhanced the… More > Graphic Abstract

Budhi Priyanto^1,2,*, Imam Khambali^1,2, Irma Septi Ardiani², Khoirotun Nadhiyah², Anna Zakiyatul Laila², M. Chasrun Hasani¹, Bima Romadhon³, Retno Asih², Yoyok Cahyono², Triwikantoro², Darminto^2,*

Journal of Renewable Materials, Vol.12, No.1, pp. 57-69, 2024, DOI:10.32604/jrm.2023.028619 - 23 January 2024

Abstract An a-C/a-C:N junction, which used palmyra sugar as the carbon source and ammonium hydroxide (NH₄OH) as the dopant source, was successfully deposited on the ITO glass substrate using the nano-spraying method. The current-voltage relationship of the junction was found to be a Schottky-like contact, and therefore the junction shows the characteristic rectifiers. This means the a-C and a-C:N are semiconductors with different types of conduction. Moreover, the samples showed an increase in current and voltage value when exposed to visible light (bright state) compared to the dark condition, thereby, indicating the creation of electron-hole pairs during the More > Graphic Abstract

R. Ranjan^a,b, C. M. S. Negi^b, S. K. Choubey^a, K. P. Tiwary^c,*

Chalcogenide Letters, Vol.20, No.10, pp. 709-724, 2023, DOI:10.15251/CL.2023.2010.709

Abstract Manganese-doped cadmium sulphide semiconductor nanoparticles (CdS: Mn) NPs have been created utilizing a microwave-assisted solvothermal technique at different Mn concentrations (0, 1%, 3%, and 5%). The chemicals utilized for the preparation of Mn doped CdS nanoparticles were sodium sulphide (Na₂S.xH₂O), manganese chloride (MnCl₂.4H₂O), and cadmium acetate (CH₃COO)₂Cd., H₂O). To determine the structural dimensions of the generated nanoparticles, the Debye-Scherer equation was used to calculate the average crystallite size at the full-width half maximum (FWHM) of the diffraction peaks. FTIR spectra analysis was used to look at the various functional and vibrational groups present in the Mn-doped CdS More >

Hamdi Hachicha^1,2, Mamadou Dia², Hassine Bouafif², Ahmed Koubaa¹, Mohamed Khlif³, Flavia Lega Braghiroli^1,*

Journal of Renewable Materials, Vol.11, No.11, pp. 3807-3829, 2023, DOI:10.32604/jrm.2023.029454 - 31 October 2023

Abstract Reconstituted wood panels have several advantages in terms of ease of manufacturing, but their shorter life span results in a huge amount of reconstituted wood panels being discarded in sorting centers yearly. Currently, the most common approach for dealing with this waste is incineration. In this study, reconstituted wood panels were converted into activated biochar through a two-step thermochemical process: (i) biochar production using pilot scale fast pyrolysis at 250 kg/h and 450°C; and (ii) a physical activation at three temperatures (750°C, 850°C and 950°C) using an in-house activation furnace (1 kg/h). Results showed that… More > Graphic Abstract

Imam Khambali^1,2,*, Budhi Priyanto^1,2, Retno Asih¹, Malik Anjelh Baqiya¹, Muhammad Mahyiddin Ramli³, Nurul Huda Osman⁴, Sarayut Tunmee⁵, Hideki Nakajima⁵, Triwikantoro¹, Mochamad Zainuri¹, Darminto^1,*

Journal of Renewable Materials, Vol.11, No.4, pp. 1823-1833, 2023, DOI:10.32604/jrm.2023.025026 - 01 December 2022

Abstract An rGO−like carbon compound has been synthesized from biomass, i.e., old coconut shell, by a carbonization process followed by heating at 400°C for 5 h. The nitrogen doping was achieved by adding the urea (CH₄N₂O) and stirring at 70°C for 14 h. The morphology and structure of the rGO-like carbon were investigated by electron microscopies and Raman spectroscopy. The presence of C-N functional groups was analyzed by Fourier transform infrared and synchrotron X-ray photoemission spectroscopy, while the particle and the specific capacitance were measured by particle sizer and cyclic voltammetry. The highest specific capacitance of 72.78 More > Graphic Abstract

Kaihan Xie¹, Yamin Hu^1,*, Stephen Afonaa-Mensah², Chuan Yuan¹, Bin Cao¹, Shuang Wang^1,*, Qian Wang¹

Journal of Renewable Materials, Vol.10, No.2, pp. 541-560, 2022, DOI:10.32604/jrm.2022.017911 - 30 August 2021

Abstract Use Enteromorpha clathrate as a carbon and nitrogen precursor could obtain the N-doped porous carbon materials by two-step pyrolysis. In this paper, the exogenous nitrogen (urea, melamine) and activating agents (KOH, ZnCl₂) were employed for the production of higher-performance carbon materials from seaweed biomass. SEM, BET, FTIR, XRD, XPS, Raman and ultimate analyses were carried out to investigate the morpho-structural and elemental peculiarities of the carbonaceous materials. Moreover, cyclic voltammetry (CV) , galvanostatic charge-discharge (GCD) and cyclic charge-discharge tests were carried out to examine the electrochemical properties of the samples. The results showed that electrochemical performance of… More > Graphic Abstract

Yinghui Sun¹, Guojie Zhang^1,2,*

The International Conference on Computational & Experimental Engineering and Sciences, Vol.22, No.1, pp. 105-105, 2019, DOI:10.32604/icces.2019.05173

Abstract A series of Co-M (M = Ce, Fe, Zr) binary oxides supported on N-doped catalysts were prepared by impregnation methods and tested for DRM reaction. Moreover, the influence of Co and Ce atomic contents in the catalysts on DRM performance was investigated. Significant enhancement of activity performance over Ce promoted 3Co-1Ce/AC-N catalyst was observed. Compared with Fe and Zr, the catalyst with 1/4 mol% of Ce showed the highest activity and was higher than the supported Co catalyst. The calcined and spent catalysts were characterized by XPS, H₂-TPR, TEM and EDX mapping studies. The characterization results… More >