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21 results on '"Xu Kun"'

3. On‐Surface Synthesis of a Dicationic Diazahexabenzocoronene Derivative on the Au(111) Surface

Author

Biswas, Kalyan, primary, Urgel, José I., additional, Xu, Kun, additional, Ma, Ji, additional, Sánchez‐Grande, Ana, additional, Mutombo, Pingo, additional, Gallardo, Aurelio, additional, Lauwaet, Koen, additional, Mallada, Benjamin, additional, Torre, Bruno, additional, Matěj, Adam, additional, Gallego, José M., additional, Miranda, Rodolfo, additional, Jelínek, Pavel, additional, Feng, Xinliang, additional, and Écija, David, additional

Published
2021
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7. Kationische stickstoffdotierte helikale Nanographene

Author

Xu, Kun, primary, Fu, Yubin, additional, Zhou, Youjia, additional, Hennersdorf, Felix, additional, Machata, Peter, additional, Vincon, Ilka, additional, Weigand, Jan J., additional, Popov, Alexey A., additional, Berger, Reinhard, additional, and Feng, Xinliang, additional

Published
2017
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14. Atomically Dispersed Iron-Nitrogen Species as Electrocatalysts for Bifunctional Oxygen Evolution and Reduction Reactions.

Author

Chen, Pengzuo, Zhou, Tianpei, Xing, Lili, Xu, Kun, Tong, Yun, Xie, Hui, Zhang, Lidong, Yan, Wensheng, Chu, Wangsheng, Wu, Changzheng, and Xie, Yi

Subjects
OXYGEN evolution reactions, RENEWABLE energy industry, OXIDATION-reduction reaction, ENERGY storage, ELECTROCATALYSIS
Abstract

Rational design of non-noble materials as highly efficient, economical, and durable bifunctional catalysts for oxygen evolution and reduction reactions (OER/ORR) is currently a critical obstacle for rechargeable metal-air batteries. A new route involving S was developed to achieve atomic dispersion of Fe-N x species on N and S co-decorated hierarchical carbon layers, resulting in single-atom bifunctional OER/ORR catalysts for the first time. The abundant atomically dispersed Fe-N x species are highly catalytically active, the hierarchical structure offers more opportunities for active sites, and the electrical conductivity is greatly improved. The obtained electrocatalyst exhibits higher limiting current density and a more positive half-wave potential for ORR, as well as a lower overpotential for OER under alkaline conditions. Moreover, a rechargeable Zn-air battery device comprising this hybrid catalyst shows superior performance compared to Pt/C catalyst. This work will open a new avenue to design advanced bifunctional catalysts for reversible energy storage and conversion devices. [ABSTRACT FROM AUTHOR]

Published
2017
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18. Solution-Liquid-Solid Synthesis of Hexagonal Nickel Selenide Nanowire Arrays with a Nonmetal Catalyst.

Author

Xu, Kun, Ding, Hui, Jia, Kaicheng, Lu, Xiuli, Chen, Pengzuo, Zhou, Tianpei, Cheng, Han, Liu, Si, Wu, Changzheng, and Xie, Yi

Subjects
*SOLID-liquid interfaces, *NICKEL compounds synthesis, *SYNTHESIS of nanowires, *HETEROGENEOUS catalysis, *ENERGY storage, *NANOSTRUCTURED materials synthesis
Abstract

Inorganic nanowire arrays hold great promise for next-generation energy storage and conversion devices. Understanding the growth mechanism of nanowire arrays is of considerable interest for expanding the range of applications. Herein, we report the solution-liquid-solid (SLS) synthesis of hexagonal nickel selenide nanowires by using a nonmetal molecular crystal (selenium) as catalyst, which successfully brings SLS into the realm of conventional low-temperature solution synthesis. As a proof-of-concept application, the NiSe nanowire array was used as a catalyst for electrochemical water oxidation. This approach offers a new possibility to design arrays of inorganic nanowires. [ABSTRACT FROM AUTHOR]

Published
2016
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19. Metallic Co4N Porous Nanowire Arrays Activated by Surface Oxidation as Electrocatalysts for the Oxygen Evolution Reaction.

Author

Chen, Pengzuo, Xu, Kun, Fang, Zhiwei, Tong, Yun, Wu, Junchi, Lu, Xiuli, Peng, Xu, Ding, Hui, Wu, Changzheng, and Xie, Yi

Subjects
*OXYGEN evolution reactions, *ELECTROCATALYSTS, *METALLIC oxides, *DENSITY of states, *COBALT oxides
Abstract

Designing highly efficient electrocatalysts for oxygen evolution reaction (OER) plays a key role in the development of various renewable energy storage and conversion devices. In this work, we developed metallic Co4Nporous nanowire arrays directly grown on flexible substrates as highly active OER electrocatalysts for the first time. Benefiting from the collaborative advantages of metallic character, 1D porous nanowire arrays, and unique 3D electrode configuration, surface oxidation activated Co4N porous nanowire arrays/carbon cloth achieved an extremely small overpotential of 257 mV at a current density of 10 mAcm-2, and a low Tafel slope of 44 mVdec-1 in an alkaline medium, which is the best OER performance among reported Co-based electrocatalysts to date. Moreover, in-depth mechanistic investigations demonstrate the active phases are the metallic Co4N core inside with a thin cobalt oxides/hydroxides shell during the OER process. Our finding introduces a new concept to explore the design of highefficiency OER electrocatalysts. [ABSTRACT FROM AUTHOR]

Published
2015
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21. Unlocking the N2 Selectivity of Benzotriazoles: Regiodivergent and Highly Selective Coupling of Benzotriazoles with Allenes.

Author

Xu, Kun, Thieme, Niels, and Breit, Bernhard

Subjects
*BENZOTRIAZOLE, *ALLENE, *COUPLING reactions (Chemistry), *RHODIUM catalysts, *REACTIVITY (Chemistry)
Abstract

The rhodium-catalyzed, highly N2- and N1-selective coupling of benzotriazoles with allenes is reported. The exceptionally high N2 and N1 selectivities were achieved by using a rhodium(I)/DPEphos and rhodium(I)/JoSPOphos catalyst, respectively. This method permits the atom-economic synthesis of valuable branched N2- and N1-allylated benzotriazole derivatives and allows for preliminary studies of their reactivity. [ABSTRACT FROM AUTHOR]

Published
2014
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