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Showing 1–9 of 9 results
Advanced filters: Author: Kug-Seung Lee Clear advanced filters

  • Integrating heterogeneous single atom nanozyme (SAzyme) configurations and homogeneous enzyme-like mechanism is promising for optimizing SAzymes but elusive. Here the authors address this issue by developing a spatial engineering strategy to fabricate dual-sites SAzymes incorporating single atom Fe active centers (Fe–N4) and Cu atomic sites (Cu–N4) in a vertically stacked Fe–N4 and Cu–N4 geometry.

    • Ying Wang
    • Vinod K. Paidi
    • Kwok-Yin Wong
    ResearchOpen Access
    Nature Communications
    Volume: 15, P: 1-13

  • Producing H2O2 electrochemically currently use electrocatalysts that are insufficient to meet the demands for industrialization. A single-atom electrocatalyst with an optimized Co–N4 moiety incorporated in nitrogen-doped graphene is shown to exhibit enhanced performance for H2O2 production.

    • Euiyeon Jung
    • Heejong Shin
    • Taeghwan Hyeon
    Research
    Nature Materials
    Volume: 19, P: 436-442

  • Electrochemical CO2 conversion to methane offers a promising solution for the large-scale storage of renewable electricity, yet the catalytic selectivity at high current density still needs to be refined. Here the authors report to use both dissolved CO2 and in-situ generated CO2 from bicarbonate to sustain high local CO2 concentration around Cu electrode and thus achieve selective CO2 conversion to methane.

    • Junsic Cho
    • Taejung Lim
    • Chang Hyuck Choi
    ResearchOpen Access
    Nature Communications
    Volume: 14, P: 1-10

  • Reversible and cooperative activation processes are important characteristics of biological enzymes and can be used in designing catalysts. Highly active TiO2 photocatalysts incorporated with site-specific single copper atoms are now shown to exhibit such a photoactivation process.

    • Byoung-Hoon Lee
    • Sunghak Park
    • Taeghwan Hyeon
    Research
    Nature Materials
    Volume: 18, P: 620-626

  • Inexpensive Fe–N–C single-atom catalysts are a promising solution to replace costly Pt-based cathode catalysts in fuel cells, but they typically suffer from low durability. Now, the degradation mechanisms of Fe–N–C catalysts are identified under operando conditions as a function of time, and potential solutions are proposed.

    • Geunsu Bae
    • Minho M. Kim
    • Chang Hyuck Choi
    Research
    Nature Catalysis
    Volume: 6, P: 1140-1150

  • The origins of increased lattice thermal conductivity in Cu-defected Cu2-x(S, Se) remain unknown. Here, neutron diffraction performed on Cu defect-controlled Cu2-xS shows that the anharmonicity can be tuned through Cu defects.

    • Seungyub Song
    • Takashi Saito
    • Takashi Kamiyama
    ResearchOpen Access
    Communications Materials
    Volume: 6, P: 1-8

  • We developed a novel surface engineering technique using electrospinning and hydrothermal processes to create a flexible, binder-free electrode composed of Ti3C2Tx MXene/carbon nanofibers (MCNFs) coated with amorphous RuOx. The MXene served as a template for the growth of amorphous and disordered state RuOx that positively impacted electrochemical performance. The combination of RuOx and MXene resulted in an enhanced pseudocapacitive reaction, resulting in a supercapacitor with a record-high energy density of 8.5 Wh kg–1 at 85.8 W kg–1, as well as excellent flexibility.

    • Hyewon Hwang
    • Sungeun Yang
    • Dongju Lee
    ResearchOpen Access
    NPG Asia Materials
    Volume: 15, P: 1-13