Applied Catalysis2022，Vol.30211.DOI:10.1016/j.apcatb.2021.120838

Graphene composites with Ru-RuO2 heterostructures: Highly efficient Mott-Schottky-type electrocatalysts for pH-universal water splitting and flexible zinc-air batteries

Chen, Di Li, Zilong Xu, Jinchang Meng, Hui Zhao, Dengke Li, Ligui Liu, Qiming Lu, Bingzhang Chen, Shaowei Wang, Nan Ning, Shunlian Yu, Xiaolong
Applied Catalysis2022，Vol.30211.DOI:10.1016/j.apcatb.2021.120838
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  • NSTL
  • Elsevier

Graphene composites with Ru-RuO2 heterostructures: Highly efficient Mott-Schottky-type electrocatalysts for pH-universal water splitting and flexible zinc-air batteries

Chen, Di 1Li, Zilong 1Xu, Jinchang 1Meng, Hui 1Zhao, Dengke 2Li, Ligui 2Liu, Qiming 3Lu, Bingzhang 3Chen, Shaowei 3Wang, Nan 1Ning, Shunlian 2Yu, Xiaolong4
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作者信息

  • 1. Jinan Univ
  • 2. South China Univ Technol
  • 3. Univ Calif Santa Cruz
  • 4. Guangdong Univ Petrochem Technol
  • 折叠

Abstract

Development of high-efficiency electrocatalysts for pH-universal overall water splitting is a critical step towards a sustainable hydrogen economy. Herein, graphene nanocomposites with Ru-RuO2 Mott-Schottky heterojunctions (Ru-RuO2@NPC) are prepared pyrolytically and exhibit a remarkable electrocatalytic activity at pH = 0-14 towards both oxygen/hydrogen evolution reactions and overall water splitting, as compared to commercial RuO2 and Pt/C. Ru-RuO2@NPC can also be used as an effective air cathode catalyst for flexible, rechargeable zinc-air batteries. Density functional theory calculations show that the formation of Ru-RuO2 heterojunctions moderately enhances the surface charge density of metallic Ru and brings the d states closer to Fermi level, as compared to that of RuO2 alone, leading to improved intrinsic electrocatalytic activity towards these important reactions. These results demonstrate the significance of Mott-Schottky heterojunctions in the development of high-efficiency electrocatalysts for various new energy technologies.

Key words

Mott-Schottky junction/Graphene nanocomposite/Ru-RuO2 heterostructure/Water splitting/Metal-air battery/HYDROGEN EVOLUTION REACTION/OXYGEN EVOLUTION/CATALYSTS/REDUCTION/OXIDE/RUO2

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出版年

2022
Applied Catalysis

Applied Catalysis

ISSN：0926-3373
被引量90
参考文献量53
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