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Robust graphene-wrapped PtNi nanosponge for enhanced oxygen reduction reaction performance
Tran, Quoc Chinh,An, Hyesung,Ha, Hyunwoo,Nguyen, Van Toan,Quang, Nguyen Duc,Kim, Hyun You,Choi, Ho-Suk The Royal Society of Chemistry 2018 Journal of Materials Chemistry A Vol.6 No.18
<P>We synthesize a graphene-wrapped 3D-PtNi nanosponge (G-PtNi NS) using formic acid as a reducing agent and carbon dots as a structure-directing agent at room temperature. Reduced Ni and Pt atoms initiate the exfoliation of carbon dots into graphene dots, which eventually encapsulate the PtNi nanocrystals. The strong Pt-carbon interaction propels the formation of the G-PtNi NS with large specific surface area and good long-term stability. The G-PtNi NS shows high reactivity for an oxygen reduction reaction (ORR). The ORR activity is maintained even after 3000 cycles. We confirm that the graphene layers physically stabilize the PtNi NS and chemically adjust the oxygen affinity of the PtNi NS, which both positively contribute to the ORR performance.</P>
Tran Thi Thu Thuy,Nguyen Manh Cuong,Tran Quoc Toan,Ngo Ngoc Thang,Bui Huu Tai,Nguyen Xuan Nhiem,Hye-Jin Hong,Sohyun Kim,Stephanie Legoupy,고영상,Young Ho Kim 대한약학회 2013 Archives of Pharmacal Research Vol.36 No.7
A series of N-substituted-1,2,3-triazole murrayafolineAderivativeswere successfully synthesized usingclick azide–alkyne Huisgen cycloaddition reaction between1-methoxy-3-methyl-9-(3-azido)-propyl-9H-carbazole andsubstituted alkynes. Their chemical structures were confirmedby 1H, 13C NMR and HR-ESI–MS spectral data. Inaddition, the interested effects on LPS-stimulated productionof pro-inflammatory cytokines in bone marrow-deriveddendritic cells of synthetic murrayafoline A derivatives werealso investigated. Our results indicated that murrayafoline Aderivatives containing 1,2,3-triazole nucleus potentiallypossessed anti-inflammatory action through inhibiting productionof IL-6, IL-12 p40 and TNF-a.
Nguyen, Van-Toan,Tran, Quoc Chinh,Quang, Nguyen Duc,Nguyen, Ngoc-Anh,Bui, Van-Tien,Dao, Van-Duong,Choi, Ho-Suk Elsevier 2018 Journal of alloys and compounds Vol.766 No.-
<P><B>Abstract</B></P> <P>The improvement of the catalytic performance for methanol and formic acid oxidation reactions remains a key issue for the development of a new generation of direct methanol and formic acid fuel cells. This study reports a simple approach, using selective chemical etching for the synthesis of unique nitrogen-doped carbon dot/Pt<SUB>84</SUB>Pd<SUB>16</SUB> (N-Cdot/Pt<SUB>84</SUB>Pd<SUB>16</SUB>) nano-network structure at room temperature with excellent electrocatalytic properties. The obtained nano-network hybrid material exhibits significant enhancement of the electrocatalytic activity for the electro-oxidation reaction of both methanol and formic acid with current densities of 999.0 and 1919.5 mA/mg<SUB>metal</SUB>, respectively, compared with the commercial ones of 751.32 and 806.02 mA/mg<SUB>metal</SUB>, respectively. Furthermore, the N-Cdot/Pt<SUB>84</SUB>Pd<SUB>16</SUB> nano-network hybrid materials exhibit excellent stability and hydrophilic dispersibility at room temperature.</P> <P><B>Highlights</B></P> <P> <UL> <LI> N-Cdot/PtPd nanonetwork hybrid material is synthesized at room temperature. </LI> <LI> A simple coreduction and a selective chemical etching are applied to the synthesis. </LI> <LI> It generates a nano-network structure with excellent electrocatalytic properties. </LI> <LI> N-Cdot functions as a uniform interconnection between the nanohybrid materials. </LI> <LI> The hybrid exhibits significant enhancement of the activity for both MOR and FAOR. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Nguyen, Van-Toan,Nguyen, Ngoc-Anh,Ali, Yousuf,Tran, Quoc Chinh,Choi, Ho-Suk Elsevier 2019 Carbon Vol.146 No.-
<P><B>Abstract</B></P> <P>A new type of three-dimensional PtMo nanosponge wrapped with graphene dots (abbreviated as 3D Pt<SUB>x</SUB>Mo<SUB>1-x</SUB>@graphene) has been developed for catalyzing the hydrogen evolution reaction (HER). The graphene-dot wrapping takes place via the exfoliation of carbon dots during the co-reduction of Pt/Mo precursors and carbon dots at a low temperature in an aqueous solution. The synergistic effects of inner metallic alloy networks and outer graphene dots in the 3D Pt<SUB>x</SUB>Mo<SUB>1-x</SUB>@graphene are responsible for the outstanding HER performance and superb durability in both acidic and alkaline electrolytes. The 3D Pt<SUB>x</SUB>Mo<SUB>1-x</SUB>@graphene shows a low Tafel slope of 32 mV/dec and 51 mV/dec together with a low overpotential of 32 mV and 97 mV at a current density of −10 mA cm<SUP>−2</SUP> in acidic and alkaline media, respectively. The catalyst also shows superb stability, as confirmed by a large amount of repeated potential cycling exceeding 5000 cycles in acidic solution and long-term durability of over 50,000 seconds in an alkaline solution. This work provides a new feasible mean of synthesizing graphene-dot-wrapped Pt-based nanostructures with highly efficient catalytic activity and superb stability for HER without the need for surfactants or stabilizers.</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Dao, Van-Duong,Larina, Liudmila L.,Tran, Quoc Chinh,Bui, Van-Tien,Nguyen, Van-Toan,Pham, Thanh-Dong,Mohamed, Ibrahim M.A.,Barakat, Nasser A.M.,Huy, Bui The,Choi, Ho-Suk Elsevier 2017 Carbon Vol.116 No.-
<P>This work focuses on systematic studies of dissolution engineering for Pt0.9M0.1/graphene(M = Au, Co, Cu, Fe, Mo, Ni, Pd, Ru, and Sn) counter electrodes (CEs). The developed nanohybrid materials exhibit higher catalytic activity and electrical conductivity compared with those of Pt/graphene CEs. The results also indicate the improved stability of the developed CEs in iodide electrolyte. Furthermore, the trend in the variation of the reactivity of the PtM alloys agrees well with the concept of density functional theory (one-electron description). An enhancement in the catalytic activity of the developed nanohybrids results from the electronic effect that originates from an upward shift of the platinum d-band to the Fermi energy level upon alloying. Thus, the Pt(0.9)M(0.1)graphene nanohybrids are cost-effective alternative CE materials to the expensive Pt. The obtained results provide a foundation for enhancing the catalytic activities of CEs for dye-sensitized solar cells (DSCs). The implementation of the Pt0.9M0.1/graphene nanohybrids offers significant potential for increasing the efficiency of DSCs. (C) 2017 Elsevier Ltd. All rights reserved.</P>
Implementation of Rehabilitation Platform based on Augmented Reality Technology
Nguyen Truong Thinh,Nguyen Anh Quoc,Nguyen Vo Tam Toan,Tran The Luc 제어로봇시스템학회 2021 제어로봇시스템학회 국제학술대회 논문집 Vol.2021 No.10
Stroke is now one of the leading causes of death and disability in both motor and cognitive functions. In addition, rehabilitation for stroke survivors also faces many physical and human difficulties. To address this issue, we studied the use of Augmented Reality (AR) in rehabilitation using a system called RARS. This system creates limbs rehabilitation exercises in the form of games using an AR interface. The goal of the RARS is to increase patient’s positive emotions, which motivates them to enjoy rehabilitation exercises. As a result, recovery efficiency will be improved, and the burden on physiotherapists will be reduced. The RARS is evaluated through a research about the effectiveness of this system on rehabilitation for patients after stroke (n=10). Reported results showed that the RARS produced significant improvement in the patient’s indicators of functional status. From that, this system shows that it not only creates great benefits for personnel and economic but also bring about huge potential for future growth.