Research Highlight

Janus nanoparticle structural motif control via asymmetric cation exchange in edge-protected Cu1.81S@IrxSy hexagonal nanoplates

Extra Form
author J. Park, J. Park, J. Lee, A. Oh, H. Baik, K. Lee
journal ACS Nano, 2018, 12, 7996.
첨부파일 '1'


Prev이전 문서

Next다음 문서

+ - Up Down Comment Print


Prev이전 문서

Next다음 문서

+ - Up Down Comment Print


Post-synthetic transformation of nanoparticles has received great attention, because this approach can provide an unusual route to elaborately composition-controlled nanostructures while maintaining the overall structure of the template. In principle, anisotropic hetero-nanoparticles of semiconductor materials can be synthesized via localized, i.e., single site, cation exchange in symmetric nanoparticles. However, the differentiation of multiple identical cation exchange sites in symmetric nanoparticles can be difficult to achieve, especially for semiconductor systems with very fast cation exchange kinetics. We posited that single-site cation exchange in semiconductor nanoparticles might be realized by imposing a significant kinetic hurdle to the cation exchange reaction. The different atomic arrangements of the core and crown in core-crown structures might further differentiate the surface energies of originally identical cation exchange sites, leading to different reactivities of these sites. The first cation exchange site would be highly reactive due to the presence of a formed interface, thereby continuing to act as a site for cation exchange propagation. Herein, we present the proof-of-concept synthesis of Janus nanoparticles by using edge-protected Cu1.81S@IrxSy hexagonal nanoplates. The Janus nanoparticles comprising {Au2S-Cu1.81S}@IrxSy or {PdS-Cu1.81S}@IrxSy exhibited dissimilar structural motifs due to the disparate cation exchange directions. This synthetic methodology exploiting cation exchange of surface-passivated semiconductor nanoparticles could fabricate the numerous symmetry-controlled Janus heterostructures.

  1. Morphology-controlled metal sulfides and phosphides for electrochemical water splitting

    J. Joo, T. Kim, J. Lee, S.-I. Choi, K. Lee
    Adv. Mater., 2019, accepted
    Because H2 is considered a promising clean energy source, water electrolysis has attracted great interest in related research and technology. Noble-metal-based catalysts have been used as electrode materials in water electroly...
    Read More
  2. Topotactic Transformations in an Icosahedral Nanocrystal to Form Efficient Water-Splitting Catalysts

    A. Oh, H. Y. Kim, H. Baik, B. Kim, N. K. Chaudhari, S. H. Joo, K. Lee
    Adv. Mater., 2019, 31, 1805546
    Designing high‐performance, precious‐metal‐based, and economic electrocatalysts remains an important challenge in proton exchange membrane (PEM) electrolyzers. Here, a highly active and durable bifunctional electrocatalyst for PEM electr...
    Read More
  3. Janus nanoparticle structural motif control via asymmetric cation exchange in edge-protected Cu1.81S@IrxSy hexagonal nanoplates

    J. Park, J. Park, J. Lee, A. Oh, H. Baik, K. Lee
    ACS Nano, 2018, 12, 7996.
    Post-synthetic transformation of nanoparticles has received great attention, because this approach can provide an unusual route to elaborately composition-controlled nanostructures while maintaining the overall structure of the templ...
    Read More
  4. Hollow nanoparticles as emerging electrocatalysts for renewable energy conversion reactions

    J. Park, T. Kwon, J. Kim, H. Jin, H.Y. Kim, B. Kim, S. H. Joo, K. Lee
    Chem. Soc. Rev., 2018, 47, 8173
    While the realization of clean and sustainable energy conversion systems primarily requires the development of highly efficient catalysts, one of the main issues had been designing the structure of the catalysts to fulfill minimum cost as we...
    Read More
  5. Dendrite-embedded Pt-Ni Multiframes as Highly Active and Durable Electrocatalyst towards the Oxygen Reduction Reaction

    H. Kwon, M. K. Kabiraz, J. Park, A. Oh, H. Baik, S.-I. Choi, K. Lee
    Nano Lett., 2018, 18, 2930.
    Pt-based nanoframe catalysts have been explored extensively due to their superior activity towards the oxygen reduction reaction (ORR). Herein, we report the synthesis of Pt-Ni multiframes, which exhibit the unique structure of tightly fu...
    Read More
  6. Vertex-reinforced PtCuCo ternary nanoframes as efficient and stable electrocatalysts for the oxygen reduction reaction and the methanol oxidation reaction

    T. Kwon, M. Jun, H. Y. Kim, A. Oh, J. Park, H. Baik, S. H. Joo, K. Lee
    Adv. Funct. Mater., 2018, 28, 1706440.
    Noble metal binary alloy nanoframes have emerged as a new class of fuel cell electrocatalysts because of their intrinsic high catalytic surface area and accompanied high catalytic activity. However, their inferior structural and comp...
    Read More
  7. Lanthanide Metal-Assisted Synthesis of Rhombic Dodecahedral MNi (M=Ir and Pt) Nanoframes toward Efficient Oxygen Evolution Catalysis

    H. Jin, Y. Hong, J. Yoon, A. Oh, N. K. Chaudhari, H. Baik, S. H. Joo, and K. Lee*
    Nano Energy, 2017, 42, 17.
    Synthesis of MNi (M = Ir or Pt) nanoframe via facet-passivation agents and its excellent electrocatalytic activity and durability to oxygen evolution reaction in acidic electrolyte. Mixed metal alloy nanoframeworks have shown a...
    Read More
  8. Radially Phase Segregated PtCu@PtCuNi Dendrite@Frame Nanocatalyst for the Oxygen Reduction Reaction

    J. Park, M. K. Kabiraz, H. Kwon, S. Park, H. Baik, S.-I. Choi*, K. Lee*
    ACS Nano, 2017, 11, 10844.
    Pt-based alloy nanoframes have shown a great potential as electrocatalysts toward oxygen reduction reaction (ORR) in fuel cells. However, the intrinsically infirm nanoframes could be severely deformed during extended electro-cyclings...
    Read More
  9. Iridium-based multimetallic nanoframe@nanoframe structure: An efficient and robust electrocatalyst toward oxygen evolution reaction

    J. Park, Y. J. Sa, H. Baik, T. Kwon, S. H. Joo*, K. Lee*
    ACS Nano, 2017, 11, 5500.
    Nanoframe electrocatalysts have attracted a great interest due to their inherently high active surface area per a given mass. Although recent progress has enabled the preparation of single nanoframe structures with a variety of...
    Read More
  10. Cobalt assisted synthesis of IrCu hollow octahedral nanocages as highly active electrocatalysts toward oxygen evolution reaction

    T. Kwon, H. Hwang, Y. J. Sa, J. Park, H. Baik, S. H. Joo*, K. Lee*
    Adv. Funct. Mater., 2017, 27, 1604688.
    . Development of oxygen evolution reaction (OER) catalysts with reduced precious metal content while enhancing catalytic performance has been of pivotal importance in cost-effective design of acid polymer electrolyte membrane water elect...
    Read More
  11. Facet-controlled hollow Rh2S3 hexagonal nanoprisms as highly active and structurally robust catalysts toward hydrogen evolution reaction

    D. Yoon, B. Seo, J. Lee, K. S. Nam, B. Kim, S. Park, H. Baik, S. H. Joo*, and K. Lee*
    Energy Environ. Sci., 2016,9, 850-856
    Developing highly active and structurally robust electrocatalysts for hydrogen evolution reaction (HER) is of paramount importance for sustainable and clean production of hydrogen. Metal sulphides exposing catalyti...
    Read More
  12. RhCu 3D Nanoframe as a Highly Active Electrocatalyst for oxygen evolution reaction under alkaline condition

    J. Park, J. Kim, Y. Yang, D. Yoon, H. Baik, S. Haam, H. Yang*, K. Lee*
    Adv. Sci. 2016, 1500252
    One pot synthesis of RhCu alloy truncated octahedral nanoframes, Cu@Rh core–shell nanoparticles, and a bundle of five RhCu nanowires is demonstrated. The RhCu alloy 3D nanoframe, in particular, exhibits excellent catalytic activit...
    Read More
  13. Rational Synthesis of Heterostructured M/Pt (M = Ru or Rh) Octahedral Nanoboxes and Octapods and Their Structure-Dependent Electrochemical Activity Toward the Oxygen Evolution Reaction

    H. Jin, K. W. Lee, N. T. Khi, H. An, J. Park, H. Baik, J. Kim, H. Yang*, K. Lee*
    Small, 2015, 11, 4462 (Cover Paper)
    Shape-controlled Pt-based seeds lead to completely different M/Pt (M = Ru or Rh) structures of nanobox or octapod. Unusually high catalytic activities of Pt@Ru octapod toward the oxygen evolution reaction are observe...
    Read More
  14. Skeletal platinum-based octahedral nanoframe with Cartesian coordinates via geometrically precise nanoscale phase segregation in a Pt@Ni core-shell nanocrystal

    A. Oh, H. Baik, D. S. Choi, J. Y. Cheon, B. Kim, H. Kim, S. Kwon, S. H. Joo*, Y. Jung*, K. Lee*
    ACS Nano, 2015, 9, 2856
    Catalytic properties of nanoparticles can be significantly enhanced by controlling nanoscale alloying and its structure. In this work, by using a facet-controlled Pt@Ni core–shell octahedron nanoparticle, we show that the...
    Read More
  15. Nanomaterials for Theranostics: Recent Advances and Future Challenges

    E. –K. Lim, T. Kim, S. Paik, S. Haam, Y.-M. Huh*, K. Lee*
    Chem. Rev., 2015, 115, 327
    This review mainly describes the theranostic research with nanomaterials since 2006, when nanomaterials started to be used extensively in the development of theranostic systems. First, a brief history of molecular imaging and per...
    Read More
Board Pagination ‹ Prev 1 Next ›
/ 1

Designed by / sketchbook5 board skin

나눔글꼴 설치 안내

이 PC에는 나눔글꼴이 설치되어 있지 않습니다.

이 사이트를 나눔글꼴로 보기 위해서는
나눔글꼴을 설치해야 합니다.

설치 취소

Sketchbook5, 스케치북5

Sketchbook5, 스케치북5

Sketchbook5, 스케치북5

Sketchbook5, 스케치북5