http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Reaz Akter Hossain,Saha Shimul,Roy Chanchal Kumar,Wahab Md Abdul,Will Geoffrey,Amin Mohammed A.,Yamauchi Yusuke,Liu Shude,Kaneti Yusuf Valentino,Hossain Md. Shahriar,Firoz Shakhawat H. 나노기술연구협의회 2022 Nano Convergence Vol.9 No.10
This work reports the rational design of MnOx nanorods on 3D crushed reduced graphene oxide (MnOx/C-rGO) by chemical reduction of Ni-incorporated graphene oxide (GO) followed by chemical etching to remove Ni. The resulting MnOx/C-rGO composite synergistically integrates the electronic properties and geometry structure of MnOx and 3D C-rGO. As a result, MnOx/C-rGO shows a significantly higher specific capacitance (Csp) of 863 F g−1 than MnOx/2D graphene sheets (MnOx/S-rGO) (373 F g−1) and MnOx (200 F g−1) at a current density of 0.2 A g−1. Furthermore, when assembled into symmetric supercapacitors, the MnOx/C-rGO-based device delivers a higher Csp (288 F g−1) than MnOx/S-rGO-based device (75 F g−1) at a current density of 0.3 A g−1. The superior capacitive performance of the MnOx/C-rGO-based symmetric device is attributed to the enlarged accessible surface, reduced lamellar stacking of graphene, and improved ionic transport provided by the 3D architecture of MnOx/C-rGO. In addition, the MnOx/C-rGO-based device exhibits an energy density of 23 Wh kg−1 at a power density of 113 Wkg−1, and long-term cycling stability, demonstrating its promising potential for practical application.
Au decorated core-shell structured Au@Pt for the glucose oxidation reaction
Shim, Kyubin,Lee, Won-Chul,Park, Min-Sik,Shahabuddin, Mohammed,Yamauchi, Yusuke,Hossain, Md Shahriar A.,Shim, Yoon-Bo,Kim, Jung Ho Elsevier 2019 Sensors and actuators. B Chemical Vol.278 No.-
<P><B>Abstract</B></P> <P>Core-shell structured Au@Pt nanoparticles (NPs) with Au cores and dendritic Pt shells have been synthesized using the sonochemical method. Then, the Au is electrochemically incorporated into nano-channels between the Pt shells on the Au@Pt NPs (Au@Pt/Au NPs) to form a non-enzymatic glucose sensor. The electrochemically active surface area (ECSA) of the obtained Au@Pt/Au NPs is enlarged compared with that of Au@Pt NPs, which leads to enhanced glucose sensing performance. The particle sizes of Au@Pt/Au NPs are in the range from 35 nm to 60 nm. The ECSA of Au@Pt/Au NPs is calculated to be 6.19 m<SUP>2</SUP> g<SUB>(Pt)</SUB> <SUP>−1</SUP> and 0.8 m<SUP>2</SUP> g<SUB>(Au)</SUB> <SUP>−1</SUP> by cyclic voltammetry. The Au incorporation into the Pt shell region can boost the glucose oxidation process even at neutral pH. The sensor performance under the optimized experimental conditions has been confirmed in phosphate buffered saline (PBS<SUB>sal</SUB>) solution, showing two wide dynamic ranges for glucose (0.5–10.0 μM and 0.01–10.0 mM) with the correlation coefficient of 0.99. The detection limit of glucose in PBS saline solution has been determined to be 445.7 (±10.3) nM.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Bimetallic Au@Pt NPs as core-shell structures demonstrate the enhanced catalytic performance for glucose oxidation. </LI> <LI> Nafion layer and dendritic Pt shells prevent passivation of the Au core. </LI> <LI> Additional Au plating further enhances catalytic performance. </LI> <LI> Rationally designed Au-decorated Au@Pt NPs show enhanced sensitivity, stability, and selectivity towards glucose detection. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Nanoarchitecture of MOF-derived nanoporous functional composites for hybrid supercapacitors
Kim, Jeonghun,Young, Christine,Lee, Jaewoo,Heo, Yoon-Uk,Park, Min-Sik,Hossain, Md. Shahriar A.,Yamauchi, Yusuke,Kim, Jung Ho The Royal Society of Chemistry 2017 Journal of materials chemistry. A, Materials for e Vol.5 No.29
<▼1><P>A new nanoarchitecture approach based on metal–organic frameworks (MOFs) is reported that can achieve high electrochemical energy storage <I>via</I> utilizing both electric double-layer supercapacitive and pseudocapacitive properties within a single nanoporous composite particle.</P></▼1><▼2><P>A new nanoarchitecture approach based on metal–organic frameworks (MOF) is reported that can achieve high electrochemical energy storage <I>via</I> utilizing both electric double-layer supercapacitive and pseudocapacitive properties within a single nanoporous composite particle. Herein, a predesigned Co<SUP>2+</SUP>-excess bimetallic hybrid Co/Zn zeolitic imidazole framework was used to fabricate a composite containing N-doped nanoporous carbon with a rich carbon nanotube (CNT) content on particle surfaces without H2, with the carbon coexisting with Co nanoparticles (NPs) and Co3O4, through controlled carbonization at 800 °C and subsequent oxidation at 250–300 °C. Optimized nanoporous carbon composites were obtained by tracking the formation of Co3O4 and destruction of N-doped nanoporous carbon (NPC) <I>via</I> detailed X-ray diffraction and X-ray photoelectron spectroscopy analysis. The resulting material showed a high surface area of ∼202 m<SUP>2</SUP> g<SUP>−1</SUP> and included coexisting micro- and mesoporous N-doped carbon, CNTs, Co NPs, and Co3O4 (15 nm in size) after a thermal oxidation process in air at 250 °C for 5 h. Surprisingly, the as-prepared MOF-derived nanoarchitecture exhibited superior electrochemical storage performance, with a capacitance of 545 F g<SUP>−1</SUP> within a wide potential window, achieving up to 320% enhanced capacitance compared to that of pristine nanoporous carbon, which is higher than those of most MOF-derived carbons reported so far. Our strategic nanoarchitecture design for MOFs offers a new opportunity for future applications in high performance energy storage systems.</P></▼2>
Shim, Kyubin,Lin, Jianjian,Park, Min-Sik,Shahabuddin, Mohammed,Yamauchi, Yusuke,Hossain, Md Shahriar A.,Kim, Jung Ho Elsevier 2019 Scripta materialia Vol.158 No.-
<P><B>Abstract</B></P> <P>A porous bimetallic palladium-platinum (Pd@Pt) nanoparticles (NPs) are prepared by using two different surfactants, poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide) (Pluronic® F-127) and polyethylene glycol hexadecyl ether (Brij® 58). Using the Pluronic® F-127 results in a more porous structure and a larger electrochemically active surface area, even though the sizes of the Pd@Pt NPs prepared using the two different surfactants are similar, approximately 100 nm. It is revealed that the Pluronic® F-127 surfactant can introduce more electrochemically active sites into the Pd@Pt NPs nanoparticles, results in enhanced bisphenol A detection with better sensitivity.</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
All-in-one energy harvesting and storage devices
Lee, Ju-Hyuck,Kim, Jeonghun,Kim, Tae Yun,Al Hossain, Md Shahriar,Kim, Sang-Woo,Kim, Jung Ho The Royal Society of Chemistry 2016 Journal of Materials Chemistry A Vol.4 No.21
<P>Currently, integration of energy harvesting and storage devices is considered to be one of the most important energy-related technologies due to the possibility of replacing batteries or at least extending the lifetime of a battery. This review aims to describe current progress in the various types of energy harvesters, hybrid energy harvesters, including multi-type energy harvesters with coupling of multiple energy sources, and hybridization of energy harvesters and energy storage devices for self-powered electronics. We summarize research on recent energy harvesters based on the piezoelectric, triboelectric, pyroelectric, thermoelectric, and photovoltaic effects. We also cover hybrid cell technologies to simultaneously generate electricity using multiple types of environmental energy, such as mechanical, thermal, and solar energy. Energy harvesters based on the coupling of multiple energy sources exhibit enhancement of power generation performance with synergetic effects. Finally, integration of energy harvesters and energy storage devices is introduced. In particular, self-charging power cells provide an innovative approach to the direct conversion of mechanical energy into electrochemical energy to decrease energy conversion loss.</P>
Synthesis and Characterization of Dendritic Pt Nanoparticles by Using Cationic Surfactant
Kani, Kenya,Zakaria, Mohamed B.,Lin, Jianjian,Alshehri, Abdulmohsen Ali,Kim, Jeonghun,Bando, Yoshio,You, Jungmok,Hossain, Md Shahriar A.,Bo, Jiang,Yamauchi, Yusuke Chemical Society of Japan 2018 Bulletin of the Chemical Society of Japan Vol. No.
Gold nanoparticles supported on mesoporous iron oxide for enhanced CO oxidation reaction
Tanaka, Shunsuke,Lin, Jianjian,Kaneti, Yusuf Valentino,Yusa, Shin-ichi,Jikihara, Yohei,Nakayama, Tsuruo,Zakaria, Mohamed Barakat,Alshehri, Abdulmohsen Ali,You, Jungmok,Hossain, Md. Shahriar A.,Yamauch The Royal Society of Chemistry 2018 Nanoscale Vol.10 No.10
<P>Herein, we report the synthesis of gold (Au)-loaded mesoporous iron oxide (Fe2O3) as a catalyst for both CO and NH3 oxidation. The mesoporous Fe2O3 is firstly prepared using polymeric micelles made of an asymmetric triblock copolymer poly(styrene-<I>b</I>-acrylic acid-<I>b</I>-ethylene glycol) (PS-<I>b</I>-PAA-<I>b</I>-PEG). Owing to its unique porous structure and large surface area (87.0 m<SUP>2</SUP> g<SUP>−1</SUP>), the as-prepared mesoporous Fe2O3 can be loaded with a considerably higher amount of Au nanoparticles (Au NPs) (7.9 wt%) compared to the commercial Fe2O3 powder (0.8 wt%). Following the Au loading, the mesoporous Fe2O3 structure is still well-retained and Au NPs with varying sizes of 3-10 nm are dispersed throughout the mesoporous support. When evaluated for CO oxidation, the Au-loaded mesoporous Fe2O3 catalyst shows up to 20% higher CO conversion efficiency compared to the commercial Au/Fe2O3 catalyst, especially at lower temperatures (25-150 °C), suggesting the promising potential of this catalyst for low-temperature CO oxidation. Furthermore, the Au-loaded mesoporous Fe2O3 catalyst also displays a higher catalytic activity for NH3 oxidation with a respectable conversion efficiency of 37.4% compared to the commercial Au/Fe2O3 catalyst (15.6%) at 200 °C. The significant enhancement in the catalytic performance of the Au-loaded mesoporous Fe2O3 catalyst for both CO and NH3 oxidation may be attributed to the improved dispersion of the Au NPs and enhanced diffusivity of the reactant molecules due to the presence of mesopores and a higher oxygen activation rate contributed by the increased number of active sites, respectively.</P>