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Kim, Heon Chul,Kim, Yena,Bando, Yoshio,Yamauchi, Yusuke,Hong, Jong Wook The Royal Society of Chemistry 2019 Journal of Materials Chemistry A Vol.7 No.38
<P>Constructing metal nanocrystal (NC)-polymer heteronanostructures (HNSs) with excellent properties in terms of ethanol adsorption and activation will lead to catalysts with a significantly enhanced electrochemical ethanol oxidation reaction (EOR). Herein, we present a facile and effective synthesis method for shape-controlled Pd NC-polyaniline (PANI) HNSs with various PANI thicknesses, which are achieved by using cubic and octahedral Pd NCs as metal NC seeds. By investigating the electrocatalytic properties of various Pd NC-PANI HNSs and their counterparts, we found that the electrocatalytic properties of the Pd NC-PANI HNSs highly depend on both the exposed facets of Pd NCs and thickness of the PANI coating. The cubic Pd NC-PANI (Pdcube-PANI) HNSs with cubic Pd NCs and a 0.7 nm PANI coating significantly improved the electrocatalytic performance for the EOR compared to the Pdcube-PANI HNSs with different PANI coating thicknesses, octahedral Pd NC-PANI (Pdocta-PANI) HNSs with octahedral Pd NCs, cubic Pd NCs, and commercial Pd/C because of synergistic advantages of the favorable exposed facet and optimal PANI coating thickness.</P>
Guo, Yanna,Tang, Jing,Wang, Zhongli,Kang, Yong-Mook,Bando, Yoshio,Yamauchi, Yusuke Elsevier 2018 Nano energy Vol.47 No.-
<P><B>Abstract</B></P> <P>Low efficiency, short lifetimes, and limited kinds of catalysts are still three fundamental shortcomings that have plagued electrochemical water splitting. Herein, we rationally synthesized a cost-effective Co<SUB>3</SUB>S<SUB>4</SUB>@MoS<SUB>2</SUB> hetero-structured catalyst that has proven to be a highly active and stable bifunctional catalyst for both hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) in an alkaline environment. The heterostructure was obtained <I>via</I> a first hydrothermal approach to obtain hollow Co<SUB>3</SUB>S<SUB>4</SUB> nanoboxes based on the ionic exchange reaction between Fe(CN)<SUB>6</SUB> <SUP>3−</SUP> of Co-Fe Prussian blue analogue (PBA) and S<SUP>2−</SUP> at 120 °C, and the subsequent <I>in situ</I> growth of MoS<SUB>2</SUB> nanosheets on the surface of Co<SUB>3</SUB>S<SUB>4</SUB> nanoboxes at an elevated temperature of 200 °C. The synergistic effects between the active and stable HER catalyst of MoS<SUB>2</SUB> and the efficient OER catalyst of Co<SUB>3</SUB>S<SUB>4</SUB>, as well as the morphological superiority of hollow and core-shell structures, endow Co<SUB>3</SUB>S<SUB>4</SUB>@MoS<SUB>2</SUB> with remarkable electrocatalytic performance and robust durability toward overall water splitting. As a result, the designed non-noble electrocatalyst of Co<SUB>3</SUB>S<SUB>4</SUB>@MoS<SUB>2</SUB> exhibits a low overpotential of 280 mV for OER and 136 mV for HER at a current density of 10 mA cm<SUP>−2</SUP> in an alkaline solution. Meanwhile, a low cell voltage of 1.58 V is achieved by using the heterostructure as both anode and cathode catalysts. This work paves the way to the design and construction of other prominent electrocatalysts for overall water splitting.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Co<SUB>3</SUB>S<SUB>4</SUB>@MoS<SUB>2</SUB> is prepared by using a two-step temperature-raising hydrothermal reaction process. </LI> <LI> Co<SUB>3</SUB>S<SUB>4</SUB>@MoS<SUB>2</SUB> is a core-shell, hollow cubic heterostructure with strong interfacial coupling. </LI> <LI> Co<SUB>3</SUB>S<SUB>4</SUB>@MoS<SUB>2</SUB> shows outstanding electrocatalytic activity and stability for overall water splitting. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>Herein, we rationally synthesized a cost-effective Co<SUB>3</SUB>S<SUB>4</SUB>@MoS<SUB>2</SUB> hetero-structured catalyst that has proven to be a highly active and stable bifunctional catalyst for both hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) in an alkaline environment.</P> <P>[DISPLAY OMISSION]</P>
Sun, Ke,Jing, Yi,Park, Namseok,Li, Chun,Bando, Yoshio,Wang, Deli American Chemical Society 2010 JOURNAL OF THE AMERICAN CHEMICAL SOCIETY - Vol.132 No.44
<P>This Communication reports a low-cost solution fabrication of wafer-scale ZnO/Si branched nanowire heterostructures and their high photodetection sensitivity, with an ON/OFF ratio larger than 250 and a peak photoresponsivity of 12.8 mA/W at 900 nm. This reported unique 3D branched nanowire structure offers a generic approach for the integration of new functional materials for photodetection and photovoltaic applications.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jacsat/2010/jacsat.2010.132.issue-44/ja1038424/production/images/medium/ja-2010-038424_0003.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/ja1038424'>ACS Electronic Supporting Info</A></P>
Correlation between Cr Distribution and Ferromagnetism in Iodine-Doped (Zn,Cr)Te
Nozomi Nishizawa,Koichiro Ishikawa,Shinji Kuroda,Koki Takita,Masanori Mitome,Yoshio Bando,Tomasz Dietl 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.5
zation measurements and structural and chemical characterizations were performed on a series of epitaxial lms grown by molecular beam epitaxy. The magnetic properties of (Zn,Cr)Te films were altered significantly by co-doping charge impurities or by changing Zn and Te flux supplies during epitaxy. The nano-scale probing of the constituent elements using energy-dispersive X-ray spectroscopy (EDS) revealed that the Cr distribution in the crystal was clearly correlated with the ferromagnetic properties and the origin of high-temperature ferromagnetism was the formation of nano-scale Cr-rich regions in inhomogeneous Cr distributions. As an origin of the variation of the uniformity of Cr distribution, it is proposed that the aggregation energy of Cr ions is modified by the deviation of the Cr charge state which is manipulated by the co-doping or the deviation from stoichiometry.
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.