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Hasani, Amirhossein,Tekalgne, Mahider,Le, Quyet Van,Jang, Ho Won,Kim, Soo Young The Royal Society of Chemistry 2019 Journal of materials chemistry. A, Materials for e Vol.7 No.2
<P>The issues of global warming and fossil fuel shortage have increased the demand for clean and renewable energy. Many researchers are investigating strategies to produce hydrogen and reduce CO2 by using solar power. Two-dimensional (2D) materials, such as graphene, graphene derivatives, and transition metal dichalcogenides (TMDs), have been extensively used owing to their extraordinary electronic and optical properties. In this review, we investigate the recent developments in 2D materials for photocatalytic applications involving the hydrogen evolution reaction and CO2 reduction. The synthesis methods and the photocatalytic properties of TMDs and graphene-based 2D materials are thoroughly discussed. Moreover, a summary of the recently developed 2D nanostructures and devices for solar hydrogen production and CO2 reduction is presented, and it is revealed that the use of 2D catalyst materials has great potential for commercialization in the near future to help overcome the energy crisis.</P>
Van Nguyen Tuan,Do Ha Huu,Tekalgne Mahider,Van Le Quyet,Nguyen Thang Phan,Hong Sung Hyun,Cho Jin Hyuk,Van Dao Dung,Ahn Sang Hyun,Kim Soo Young 나노기술연구협의회 2021 Nano Convergence Vol.8 No.33
Following publication of the original article [1], the affiliation of the authors was incorrectly published in the article. The affiliation which was shown in supplementary information is correct. This has been corrected with this erratum.
Tungsten Trioxide Doped with CdSe Quantum Dots for Smart Windows
Hasani, Amirhossein,Le, Quyet Van,Tekalgne, Mahider,Guo, Wenwu,Hong, Sung Hyun,Choi, Kyoung Soon,Lee, Tae Hyung,Jang, Ho Won,Kim, Soo Young American Chemical Society 2018 ACS APPLIED MATERIALS & INTERFACES Vol.10 No.50
<P>Nanocrystal quantum dots (QDs) provide tunable optoelectronic properties on the basis of their dimension. CdSe QDs, which are size-dependent colloidal nanocrystals, are used for efficient electrochromic devices owing to their unique properties in modulating quantum confinement, resulting in enhanced electron insertion during the electrochromic process. Incorporating a well-known metal oxide electrochromic material such as WO<SUB>3</SUB> into CdSe QDs enhances the redox process. Herein, we propose a facile method for producing and optimizing CdSe QDs doped in WO<SUB>3</SUB>. The fabrication of the electrochromic film involves a solution and annealing process. Moreover, the effect of the QD size to optimize the electrochromic layer is studied. As a result, the coloration efficiency of WO<SUB>3</SUB> and optimized CdSe QD-WO<SUB>3</SUB> are obtained as 68.6 and 112.3 cm<SUP>2</SUP>/C, respectively. Thus, size-tunable nanocrystal QDs combined with a metal oxide yield high-performance electrochromic devices and are promising candidates for producing smart windows.</P> [FIG OMISSION]</BR>
WS2–WC–WO3 nano-hollow spheres as an efficient and durable catalyst for hydrogen evolution reaction
Van Nguyen Tuan,Do Ha Huu,Tekalgne Mahider,Van Le Quyet,Nguyen Thang Phan,Hong Sung Hyun,Cho Jin Hyuk,Van Dao Dung,Ahn Sang Hyun,Kim Soo Young 나노기술연구협의회 2021 Nano Convergence Vol.8 No.28
Transition metal dichalcogenides (TMDs), transition metal carbides (TMCs), and transition metal oxides (TMOs) have been widely investigated for electrocatalytic applications owing to their abundant active sites, high stability, good conductivity, and various other fascinating properties. Therefore, the synthesis of composites of TMDs, TMCs, and TMOs is a new avenue for the preparation of efficient electrocatalysts. Herein, we propose a novel low-cost and facile method to prepare TMD–TMC–TMO nano-hollow spheres (WS 2 –WC–WO 3 NH) as an efficient catalyst for the hydrogen evolution reaction (HER). The crystallinity, morphology, chemical bonding, and composition of the composite material were comprehensively investigated using X-ray diffraction, Raman spectroscopy, field emission scanning electron microscopy, and X-ray photoelectron spectroscopy. The results confirmed the successful synthesis of the WS 2 –WC–WO 3 NH spheres. Interestingly, the presence of nitrogen significantly enhanced the electrical conductivity of the hybrid material, facilitating electron transfer during the catalytic process. As a result, the WS 2 –WC–WO 3 NH hybrid exhibited better HER performance than the pure WS 2 nanoflowers, which can be attributed to the synergistic effect of the W–S, W–C, and W–O bonding in the composite. Remarkably, the Tafel slope of the WS 2 –WC–WO 3 NH spheres was 59 mV dec −1 , which is significantly lower than that of the pure WS 2 NFs (82 mV dec −1 ). The results also confirmed the unprecedented stability and superior electrocatalytic performance of the WS 2 –WC–WO 3 NH spheres toward the HER, which opens new avenues for the preparation of low-cost and highly effective materials for energy conversion and storage applications.
Recent progress of two-dimensional materials and metal–organic framework-based taste sensors
HASANI AMIRHOSSEIN,Do Ha Huu,Tekalgne Mahider,홍성현,장호원,김수영 한국세라믹학회 2020 한국세라믹학회지 Vol.57 No.4
In food industries, the detection of diff erent tastes in low level is required to enhance the quality of products. Recently, 2-D materials and metal–organic framework (MOF) have attracted extensive attention owing to their unique properties, and they can be used in various applications, especially chemical and biochemical sensing. In this review, we investigate the recent progress of the 2-D materials and MOF in the taste sensing applications. From the review, we could conclude that these materials would be promising candidates for taste sensing applications, thereby leading to the development of food industry.
The role of metal dopants in WS<sub>2</sub> nanoflowers in enhancing the hydrogen evolution reaction
Hasani, Amirhossein,Nguyen, Thang Phan,Tekalgne, Mahider,Van Le, Quyet,Choi, Kyoung Soon,Lee, Tae Hyung,Jung Park, Tae,Jang, Ho Won,Kim, Soo Young Elsevier 2018 Applied Catalysis A Vol.567 No.-
<P><B>Abstract</B></P> <P>We demonstrate a facile and efficient method for the synthesis of a metal-doped WS<SUB>2</SUB> nanoflower (NF) catalyst. We also report its application for the electrocatalytic hydrogen evolution reaction (HER). The flower-like WS<SUB>2</SUB> particles were produced by a hydrothermal reaction, and, subsequently, the WS<SUB>2</SUB> was doped with metal chlorides such as AuCl<SUB>3</SUB>, AgCl, PtCl<SUB>2</SUB>, and PdCl<SUB>2</SUB>, followed by reduction with sodium borohydride to form metal-doped WS<SUB>2</SUB> NFs. The Pd-doped WS<SUB>2</SUB> NF catalyst showed a high HER performance, having a Tafel slope of 54 mV/dec and an overpotential of -175 mV at −10 mA cm<SUP>−2</SUP>. The improvement is attributed to the energy band alignment near the H<SUP>+</SUP>/H<SUB>2</SUB> reduction potential and the large surface area of the WS<SUB>2</SUB> NFs.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Producing high quality and efficient WS<SUB>2</SUB> nanoflowers by a facile hydrothermal process. </LI> <LI> Metal doping of WS<SUB>2</SUB> nanoflowers <I>via</I> reduction process. </LI> <LI> A uniform distribution of metal atoms into WS<SUB>2</SUB> nanoflowers during doping process. </LI> <LI> Application of optimized Pd-doped WS<SUB>2</SUB> nanoflowers as a catalyst in hydrogen evolution reaction. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>