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Hien, Truong Thi,Van Lam, Do,Kim, Chunjoong,Vuong, Nguyen Minh,Quang, Nguyen Duc,Kim, Dahye,Chinh, Nguyen Duc,Hieu, Nguyen Minh,Lee, Seung-Mo,Kim, Dojin Elsevier 2016 Journal of Power Sources Vol.336 No.-
<P><B>Abstract</B></P> <P>The photoelectrochemical properties of CdS-sensitized ZnO nanorods grown on Pt-coated WO<SUB>3</SUB> nanoplates are investigated to evaluate their effectiveness in hydrogen production. WO<SUB>3</SUB> nanonanoplates are synthesized on glass substrates, followed by atomic layer deposition of Pt thin films as the terminal electrode to efficiently collect the photo-carriers generated from the ZnO/CdS absorption layers. Optimization of the fabrication process for the 3D hierarchical structure is performed, and the morphology and its effect on the photoelectrochemical performance of the electrodes are carefully studied using scanning electron microscopy, x-ray diffraction, and measurements of the photocurrent density and photo-conversion efficiencies. The enhanced PEC performance is elucidated by the 3D hierarchical geometry of the electrode. The optimized electrode shows a photocurrent density of ∼ 13 mA cm<SUP>−2</SUP> and a conversion efficiency of ∼8.0% at −0.83 V (<I>vs</I>. SCE) in 0.5 M Na<SUB>2</SUB>S solution under the illumination of simulated solar light.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Fabrication of 3D hierarchical nanostructure by 2D WO<SUB>3</SUB> combined with 1D ZnO/CdS. </LI> <LI> Pt layer insertion to enhance current collecting capability of the electrode. </LI> <LI> Optimized nanostructural electrode design for the maximum performance. </LI> <LI> Extract the ultimate performance of CdS as a water-splitting photoanode. </LI> </UL> </P>
Sn Doping into Hematite Nanorods for High-Performance Photoelectrochemical Water Splitting
Hien, Truong Thi,Quang, Nguyen Duc,Hung, Nguyen Manh,Yang, Haneul,Chinh, Nguyen Duc,Hong, Soonhyun,Hieu, Nguyen Minh,Majumder, Sutripto,Kim, Chunjoong,Kim, Dojin The Electrochemical Society 2019 Journal of the Electrochemical Society Vol.166 No.15
<P>Photoelectrochemical water splitting is of great attention due to its environmental friendly generation of clean fuels. Hematite (α-Fe<SUB>2</SUB>O<SUB>3</SUB>) is considered one of the promising candidates due to its intrinsic properties for the high performance photoelectrochemical electrode such as favourable bandgap (2.0–2.2 eV), a suitable energy band position, non-toxicity, low cost, and excellent chemical stability. Herein, we report about Sn-doped hematite nanorods and their implementation as photoanodes for photoelectrochemical water splitting. We provide the simple but efficient route to incorporate the Sn into the hematite without structural damage in the nanostructure and scrutinize the effect of Sn dopant on the photoelectrochemical activity of the hematite. By the two-step heat-treatment process, Sn can be successfully incorporated into the hematite, which reveals the enhanced photoelectrochemical responses compared with undoped hematite. We elaborate the effect of Sn dopant in the hematite on the photoelectrochemical activities, thereby the optimum concentration of Sn dopant can be suggested. In addition, the catalyst layer of the cobalt phosphate is introduced to further increase the photoelectrochemical performance of Sn-doped hematite nanorods.</P>
Hong Thi Bich Truong,Hiep Nghia Bui,Hieu Trung Nguyen,Thanh-Luu Pham,Duy Ngoc Nguyen,Yuan-Shing Perng,Linh Thi My Lam,Thi-Dieu-Hien Vo,Van-Truc Nguyen,Ha Manh Bui 한국화학공학회 2022 Korean Journal of Chemical Engineering Vol.39 No.4
Electron-beam (EB) irradiation was employed to degrade enrofloxacin (ENR) in an aqueous solution. Thealgal growth inhibition test revealed that ENR exhibited low toxicity against the cyanobacterium Arthrospira sp., with anEC50-96 h value of 5.17mg/L. The Taguchi design also involved finding the best optimum for ENR treatment using EB. Results revealed that the high-efficiency removal of ENR in an aqueous solution was approximately 98.53% under theoptimum conditions of an absorbed dose of 5 kGy, a pH of 5.0, and an initial ENR concentration of 10 mg/L and anH2O2 concentration of 2mM. The ERR degradation under a couple of EB irradiation and H2O2 followed pseudo-firstorderkinetics, with an R2 of ~0.970. The major degradation pathways of ENR were suggested by density functional theory,natural bond orbital calculations, and liquid chromatography-tandem mass spectrometry (LC/MS/MS) analysis. Lifecycle assessment (LCA) was also performed to evaluate the impact of the EB on removing ENR; the industrial processwas designed based on laboratory tests aimed with the ReCiPe tool. The obtained results indicated that energy consumptionand H2O2 affect environmental impacts with order human health, ecology systems, and natural resource. The LCAalso proved that EB could be a green and efficient method for eliminating pharmaceutical contaminants in water.
Quang, Nguyen Duc,Hien, Truong Thi,Chinh, Nguyen Duc,Kim, Dahye,Kim, Chunjoong,Kim, Dojin Elsevier 2019 ELECTROCHIMICA ACTA Vol.295 No.-
<P><B>Abstract</B></P> <P>The novel photoelectrochemical cell with very high photocurrent density (>35 mA/cm<SUP>2</SUP>) is demonstrated by nanoscale architecturing of TiO<SUB>2</SUB>/CdS/CdSe multi-core-shell nanorods. While dimensions of constituting layers, i.e. TiO<SUB>2</SUB> nanorod templates, CdS, and CdSe shell layers, are optimized by thorough investigation of optical and photoelectrochemical responses of each layer, high light absorption through the nanorod geometry and facile transport of the photo-generated electrons and holes along the high conduction path of CdSe and CdS result in the high photoelectrochemical performances. In addition, the microscopic model for the electron and hole transport in the core-shell nanorod is elaborated using the energy band diagram. The demonstration of the high performance PEC electrode as well as the platform to optimize PEC electrodes are highlighted in the current work.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Design of the TiO<SUB>2</SUB>/CdS/CdSe double-sheath core-shell nanorod array. </LI> <LI> Superior photoelectrochemical properties (high photocurrent density). </LI> <LI> Fundamental understanding about the charge transport mechanism of the core-shell nanorod. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Chinh, Nguyen Duc,Hien, Truong Thi,Do Van, Lam,Hieu, Nguyen Minh,Quang, Nguyen Duc,Lee, Seung-Mo,Kim, Chunjoong,Kim, Dojin Elsevier 2019 Sensors and actuators. B, Chemical Vol.281 No.-
<P><B>Abstract</B></P> <P>ZnO thin-films with precisely controlled thicknesses were fabricated by the atomic layer deposition and their <I>NO</I> gas sensing properties were investigated at different temperatures, and in particular, under light irradiation of various energy and intensity at room temperature with and without Au catalyst. The molecular dynamics of <I>NO</I> and <I>O</I> <SUB>2</SUB> during the response and recovery cycles in relation with the <I>NO</I> sensing performance in air environment was elaborated using the energy diagram modelled for adsorption and desorption kinetics of the gas molecules. The blue light irradiation combined with Au catalytic effect greatly enhanced the <I>NO</I> response rate, but delayed the recovery rate in the air environment via molecular dynamic interference from the environmental oxygen. The optimum condition for <I>NO</I> sensing was obtained for the film thickness, light energy and intensity. Critical issues for the stable sensor operation such as concentration dependence, gas selectivity, and humidity effect were also reported.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Gas sensing response/recovery kinetics of NO sensing by ZnO with light irradiation and Au catalytic effect at room temperature. </LI> <LI> Molecular dynamics consideration for adsorption and desorption to explain the detection of ppm level gas concentrations. </LI> <LI> The nano-effect in varying thicknesses of ZnO. </LI> </UL> </P>
Chien Minh Tran,Ngoc Thi‑Thanh Nguyen,Minh Hieu Ho,Vinh Khanh Doan,Khanh Loan Ly,Nhi Ngoc‑Thao Dang,Nam Minh‑Phuong Tran,Hoai Thi‑Thu Nguyen,Long Phuoc Truong,Thai Minh Do,Quyen Ngoc Tran,Hien Quoc Ng 한국섬유공학회 2023 Fibers and polymers Vol.24 No.1
In this study, we proposed a straightforward electrospun polycaprolactone (PCL) loaded with silver nanoparticles (SNPs)membrane fabrication process, in which SNPs were directly synthesized from silver nitrate (AgNO3) in PCL–acetone mixtureby gamma irradiation. The insolubility of AgNO3in PCL solution was solved using an auxiliary dimethyl sulfoxide solvent. As a physical approach, gamma rays readily converted silver ions into SNPs without the addition of harmful reductionagents, which reduced the cytotoxicity of the synthesized material. By avoiding some processes such as purification, solventremoval, or redispersion of SNPs, this method was more time-saving compared to other related studies. SNPs formation wasconfirmed by both UV–Visible spectrum (UV–Vis) and X-ray diffraction analysis. Scanning electron microscopy (SEM)revealed that the addition of SNPs significantly reduced the fiber diameter of PCL–Ag membranes compared to that of rawPCL. Uniform spherical-shaped SNPs incorporated in PCL fibers were observed under transmission electron microscopy(TEM). The tensile test showed that the electrospun PCL–Ag membranes exhibited good mechanical characteristics. Moistureeasily penetrated the porous microstructure of PCL–Ag, facilitating wound humidity regulation. Inductively coupledplasma-mass spectroscopy (ICP-MS) was employed to study the release profiles of SNPs at different time intervals. Overall,the PCL–Ag 500 ppm sample exerted excellent antibacterial activity against Pseudomonas aeruginosa and Staphylococcusaureus strains and low in vitro cytotoxicity.
3D Inverse-Opal Structured Li4Ti5O12 Anode for Fast Li-Ion Storage Capabilities
김다혜,Nguyen Duc Quang,Truong Thi Hien,Nguyen Duc Chinh,김천중,김도진 대한금속·재료학회 2017 ELECTRONIC MATERIALS LETTERS Vol.13 No.6
Since the demand for high power Li-ion batteries (LIBs) is increasing,spinel-structured lithium titanate, Li4Ti5O12 (LTO), as the anodematerial has attracted great attention because of its excellent cycleretention, good thermal stability, high rate capability, and so on. However, LTO shows relatively low conductivity due to empty 3dorbital of Ti4+ state. Nanoscale architectures can shorten electronconduction path, thus such low electronic conductivity can beovercome while Li+ can be easily accessed due to large surface area. Herein, three dimensional bicontinuous LTO electrodes were preparedvia close-packed self-assembly with polystyrene (PS) spheresfollowed by removal of them, which leads to no blockage of Li+ iontransportation pathways as well as fast electron conduction. 3Dbicontinuous LTO electrodes showed high-rate lithium storagecapability (103 mAh/g at 20 C), which is promising as the powersources that require rapid electrochemical response.