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Browsing by Author "Li, Huaming"

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    Harnessing strong metal-support interactions via a reverse route
    Wu, Peiwen; Tan, Shuai; Moon, Jisue; Yan, Zihao; Fung, Victor; Li, Na; Yang, Shi-Ze; Cheng, Yongqiang; Abney, Carter W.; Wu, Zili; Savara, Aditya; Momen, Ayyoub M.; Jiang, De-en; Su, Dong; Li, Huaming; Zhu, Wenshuai; Dai, Sheng; Zhu, Huiyuan (2020-06-16)
    Engineering strong metal-support interactions (SMSI) is an effective strategy for tuning structures and performances of supported metal catalysts but induces poor exposure of active sites. Here, we demonstrate a strong metal-support interaction via a reverse route (SMSIR) by starting from the final morphology of SMSI (fully-encapsulated core-shell structure) to obtain the intermediate state with desirable exposure of metal sites. Using core-shell nanoparticles (NPs) as a building block, the Pd-FeOx NPs are transformed into a porous yolk-shell structure along with the formation of SMSIR upon treatment under a reductive atmosphere. The final structure, denoted as Pd-Fe3O4-H, exhibits excellent catalytic performance in semi-hydrogenation of acetylene with 100% conversion and 85.1% selectivity to ethylene at 80 degrees C. Detailed electron microscopic and spectroscopic experiments coupled with computational modeling demonstrate that the compelling performance stems from the SMSIR, favoring the formation of surface hydrogen on Pd instead of hydride.
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    High-performance electrolytic oxygen evolution with a seamless armor core-shell FeCoNi oxynitride
    Di, Jun; Zhu, Huiyuan; Xia, Jiexiang; Bao, Jian; Zhang, Pengfei; Yang, Shi-Ze; Li, Huaming; Dai, Sheng (2019-04-21)
    Highly active, low-cost, and durable electrocatalysts for the water oxidation reaction are pivotal in energy conversion and storage schemes. Here we report a nitride-core, oxide-shell-armor structured FeCoNi oxynitride as an efficient oxygen evolution electrocatalyst with a homogeneous nitride (Fe0.70Co0.56Ni0.92N1.0O0.06) core and an oxide (Fe0.48Co0.1Ni0.21N0.05O1.0) shell. The catalyst demonstrated excellent activity for the oxygen evolution reaction with a current density of 10 mA cm(-2) at a low overpotential of 0.291 V in alkaline media (1 M KOH), which is superior to the activities of commercial IrO2, RuO2, and Pt/C catalysts and comparable to those of state-of-the-art catalysts (e.g., NiFe-LDH, NiCo2O4, O-NiCoFe-LDH). Density functional theory simulations suggested that the incorporation of multiple metal elements can indeed improve the reaction energetics with a synergistic effect from the core-shell structure. This unique structure of a nitride-core with a oxide-shell presents a new form of multimetallic oxynitride with compelling performance in electrolytic oxygen evolution.