SOLAR ENERGY MATERIALS AND SOLAR CELLS
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2025
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IF 6.3
Getinet Yenealem Ashebir,Chao Dong
We present a Cd-diffusion strategy to fabricate large-grained, phase-pure Cu 2 CdSnS 4 absorber films by sulfurizing a solution-processed bi-layer CdS/Cu 2 SnS 3 films. The key novelty lies in using Cd diffusion from a thin underlying CdS layer to uniformly convert a Cu 2 SnS 3 layers into Cu 2 CdSnS 4 , successfully eliminating the small-grained bottom layer that typically plagues solution-processed kesterite/stannite films. We demonstrate that the phase transformation to pure Cu 2 CdSnS 4 is governed by the final Cd content in the film matrix, not by the Cd diffusion length. Optimized films, obtained at a sulfurization temperature of 550 °C, exhibit ideal optoelectronic properties with a band gap of ∼1.40 eV and a high absorption coefficient (>10 5 cm −1 ). Solar cells in a FTO/TiO 2 /Cu 2 CdSnS 4 /P3HT/MoO 3 /Ag configuration achieve a power conversion efficiency of 3.81 %, attributed to the high-quality, large-grained Cu 2 CdSnS 4 absorber. This work provides a promising pathway for developing efficient thin-film solar cells with homogeneous morphology.
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PHOTOCHEMICAL & PHOTOBIOLOGICAL SCIENCES
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2026
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IF 3.5
Bekena Fekadu Tadesse,Kuo Dong-Hau,Duresa Lalisa Wakjera
Photocatalysis is one of the latest and the most promising technologies to remove organic pollutants from the environment. In this work, novel Nb/Co-codoped MoOS photocatalyst was prepared by a simple chemical precipitation method and thereafter the as-prepared photocatalysts were systematically characterized by different techniques. The photocatalytic performance of the as-prepared samples was surveyed by the degradation of methyl orange (MO), rhodamine B (RhB), and methylene blue (MB) dyes under visible light irradiation. All the codoped photocatalysts exhibited enhanced photocatalytic activity than pure and mono doped samples for degradation of these dyes with the highest degradation efficiency observed for the sample with 10 % Nb amount, which degrade 94.4 % of MO, 97.1 % of RhB, and 99.7 % of MB within 150, 20, and 40 min irradiation time, respectively. The HPLC test further confirmed the degradation of these dyes. The rate constants of MO, RhB, and MB removal in the photodegradation process over 10Nb-10Co-MoOS were determined. The enhanced photocatalytic activity of the sample was due to high charge separation and inhibition of recombination of photogenerated electron-hole pairs. The scavenger studies indicate that the primary active species in the photocatalytic process for MO and MB were superoxide radicals and for RhB were hydroxyl radicals, indicating 10Nb-10Co-MoOS had be widely used for different dye degradation. The catalyst revealed excellent recyclability and stability even after three runs. Finally, a reasonable reaction mechanism was proposed.
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Chemical Engineering Journal Advances
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2025
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IF 7.1
Amare Aregahegn Dubale,Borsamo Boroje,Workineh Mengesha Fereja,Wei-Qi Wang
The use of herbicides in farming to manage growth, combat pests, and enhance crop production ultimately contributes to environmental pollution. However, the removal of these herbicides remains challenging due to high costs, limited adsorption efficiency, complex synthesis, and poor stability of the adsorbents. In this study, we synthesized a nickel oxalate metal-organic frameworks like coordination compound (Ni-Ox) using a straightforward hydrothermal method for the adsorptive removal of 2,4-dichlorophenoxyacetic acid (2,4-D) from wastewater samples. The adsorbent exhibited a unique morphology with a mesoporous structure, abundant functional groups, and a homogeneous elemental composition and distribution, as characterized by X-ray diffraction (XRD), Fourier transform infrared (FTIR), scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM) and Brunauer-Emmett-Teller (BET) analysis. Ni-Ox demonstrated an exceptionally high removal efficiency of 99.7% for 2,4-D under optimal adsorption conditions: pH 2, contact time of 60 minutes, dose of 80 mg, stirring speed of 120 rpm, batch volume of 50 mL, and an initial concentration of 100 mg L⁻¹. The adsorption of 2,4-D on Ni-Ox was best described by the Langmuir model, with a maximum theoretical adsorption capacity of 384.6 mg g⁻¹ at 298 K. The kinetic data were best fitted by the pseudo-second-order model, yielding a rate constant of 2.8 × 10⁻³ g mg⁻¹ min⁻¹ and a q e value of 60.98 mg g⁻¹. Thermodynamic analysis indicated that the adsorption process was both endothermic and spontaneous, as evidenced by a positive ΔH° (+65.9 kJ mol⁻¹) and negative ΔG° values. The adsorption mechanism of 2,4-D on Ni-Ox was elucidated through post-characterization using XPS, FTIR, and XRD, and was found to be primarily driven by electrostatic attraction, hydrogen bonding, and van der Waals forces. Furthermore, Ni-Ox maintained an efficiency of over 80% even after multiple regeneration and reuse cycles. These findings provide valuable insights for the design of effective adsorbents for the herbicide removal from aquatic environment.
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NANOTECHNOLOGY
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2025
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IF 2.8
Abdudin Geremu TEMAM,Adil Alshoaibi,Chawki Awada,Assumpta Chinwe Nwanya,Fabian I Ezema,P. M. Ejikeme
The development of renewable energy technologies requires effective energy storage devices. Supercapacitors are promising energy storage devices that have attracted considerable attention from researchers due to their fast charging and discharging rates. In this study, V2O5 and f-CNT integrated V2O5 composites (f-CNT/V2O5) were synthesized and studied for electrochemical capacitors' application. While the V2O5 was synthesised using a hydrothermal process. The f-CNT integrated V2O5 (f-CNT/V2O5) composites at various percentages of f-CNT were synthesized using a wet impregnation process. The specific capacitance obtained for V2O5 nanoparticles was 20.78 F.g-1 at 0.1 A.g-1, but f-CNT integrated V2O5 composites showed enhanced specific capacitance of 66.58, 140.94 and 73.15 F.g-1 at 0.1 A.g-1 for f-CNT/V2O5 (10:90), f-CNT/V2O5 (20:80) and f-CNT/V2O5 (30:70) composite, respectively. These results confirmed the enhancement in the supercapacitive performance of V2O5 due to the integration of f-CNT into it. The f-CNT facilitates electron transfer through enhanced conductivity and promote redox reactions through an increased electrode surface area. The best performing f-CNT/V2O5 composite (f-CNT/V2O5 (20:80)) electrode was used to assemble an asymmetrical supercapacitor cell. The f-CNT/V2O5//C device shows a specific capacitance of 261.1 F.g-1 at 1 A.g-1, and 81.8 % of coulombic efficiency for 5000 cycles at 4 A.g-1. Additionally, the assembled device shows a characteristic energy density (52.2 Wh.kg-1) and power density (2400 W.kg-1), which is better than many similar devices.
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LANGMUIR
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2024
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IF 3.7
Adugna Boke Abdeta,Feyisa Wedajo,Qinhan Wu,Dong-Hau Kuo,Ping Li,Hanya Zhang,Ting Huang,Jinguo Lin,Xiaoyun Chen
Cellulose plays a significant role in designing efficient and stable cellulose-based metallic catalysts, owing to its surface functionalities. Its hydroxyl groups are used as anchor sites for the nucleation and growth of metallic nanoparticles and, as a result, improve the stability and catalytic activity. Meanwhile, cellulose is also amenable to surface modifications to be more suitable for incorporating and stabilizing metallic nanoparticles. Herein, the Ag-/Bi-doped Mo(S,O)3 trimetallic sulfo-oxide anchored on B and N codoped cellulose (B–N–C) synthesized by a facile approach showed excellent stability and catalytic activity for PHER at 573.28 μmol/h H2 with 25 mg of catalyst under visible light, and 92.3% of the 4-nitrophenol (4-NP) reduction was achieved within 135 min by in situ-generated protons. In addition to B and N codoping, our use of the calcination method for B–N–C preparation further increases the structural disorders and defects, which act as anchoring sites for Ag-/Bi-doped Mo(S,O)3 nanoparticles. The Ag-/Bi-doped Mo(S,O)3@B–N–C surface active site also stimulates H2O molecule adsorption and activation kinetics and reduces the photogenerated charge carrier’s recombination rate. The Mo4+ → Mo6+ electron hopping transport and the O 2p and Bi 6s orbital overlap facilitate the fast electron transfer by enhancing the electron’s lifetime and photoinduced charge carrier mobility, respectively. In addition to acting as a support, B–N–C provides a highly conductive network that enhances charge transport, and the relocated electron in B–N–C activates the H2O molecule, which enables Ag-/Bi-doped Mo(S,O)3@B–N–C to have appreciable PHER performance.
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