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Controllable Synthesis of Ru Nanocrystallites on Graphene Substrate as a Catalyst for Ammonia Synthesis

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Abstract

Controllable synthesis of Ru nanocrystallites on graphene substrate using polyol methods was reported herein. The zeta potential of graphene oxide dispersed in polyols is found to play a key role in tailoring the morphology and oxidation state of Ru nanocrystallites on graphene substrate. Negatively charged graphene oxide can coordinate with Ru3+ precursors via its carboxylic acid groups to form C–O–Ru complexes, leading to the epitaxial growth of hexagonally shaped cationic ruthenium nanocrystallites of 3–5 nm, which shows high catalytic activities for ammonia synthesis as expected; whereas positively charged graphene oxides can only interact with Ru3+ precursors via Van der Waals forces, resulting in a significant agglomeration of metallic ruthenium nanoparticles and thus a low catalytic performance.

Graphical Abstract

The morphology and oxidation state of ruthenium nanocrystallites supported on graphene substrate, thus the catalytic activity for ammonia synthesis, can be tailored by tuning the zeta potential of graphene oxide dispersed in polyols.

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Acknowledgements

This work was financially supported by the National Natural Science Foundation of China (21573163) and the Natural Science Foundation of Hubei Province (2015CFA017).

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Authors and Affiliations

  1. Hubei Key Laboratory of Biomass-Resource Chemistry and Environmental Biotechnology, School of Resources and Environmental Sciences, Wuhan University, Wuhan, 430079, People’s Republic of China

    Jiemin Zhao, Jiande Zhou, Mingwei Yuan & Zhixiong You

  2. International Cooperation Base for Sustainable Utilization of Resources and Energy in Hubei Province, Wuhan, 430072, People’s Republic of China

    Jiemin Zhao, Jiande Zhou, Mingwei Yuan & Zhixiong You

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  1. Jiemin Zhao
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  2. Jiande Zhou
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  3. Mingwei Yuan
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  4. Zhixiong You
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Correspondence to Zhixiong You.

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Zhao, J., Zhou, J., Yuan, M. et al. Controllable Synthesis of Ru Nanocrystallites on Graphene Substrate as a Catalyst for Ammonia Synthesis. Catal Lett 147, 1363–1370 (2017). https://doi.org/10.1007/s10562-017-2045-1

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  • DOI: https://doi.org/10.1007/s10562-017-2045-1

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