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Self-Limiting Growth of Single-Layer N-Doped Graphene Encapsulating Nickel Nanoparticles for Efficient Hydrogen Production

Self-Limiting Growth of Single-Layer N-Doped Graphene Encapsulating Nickel Nanoparticles for Efficient Hydrogen Production
Zhang, ChunfeiJu, ShenghongKang, Tong-HyunPark, GisangLee, Byong-JuneMiao, HeWu, YunwenYuan, JinliangYu, Jong-Sung
DGIST Authors
Zhang, Chunfei; Ju, Shenghong; Kang, Tong-Hyun; Park, Gisang; Lee, Byong-June; Miao, He; Wu, Yunwen; Yuan, Jinliang; Yu, Jong-Sung
Issue Date
ACS Applied Materials and Interfaces, 13(3), 4294-4304
Author Keywords
N-doped carbonsingle-layer graphenenickel nanoparticlescore-shell structurebinder-free electrode
GrapheneHydrogen productionNanoparticlesNickelSilicaAlkaline mediumNi NanoparticlesNickel nanoparticlesSynthesis (chemical)Adhesive stabilityNon-precious metal catalystsSelf-limiting growthsSilica nano-sheetsState of the artDoping (additives)AdhesivesCatalystsCost effectivenessElectrodes
Effective nonprecious metal catalysts are urgently needed for hydrogen evolution reaction (HER). The hybridization of N-doped graphene and a cost-effective metal is expected to be a promising approach for enhanced HER performance but faces bottlenecks in controllable fabrication. Herein, a silica medium-assisted method is developed for the high-efficient synthesis of single-layer N-doped graphene encapsulating nickel nanoparticles (Ni@SNG), where silica nanosheets molecule sieves tactfully assist the self-limiting growth of single-layer graphene over Ni nanoparticles by depressing the diffusion of gaseous carbon radical reactants. The Ni@SNG sample synthesized at 800 °C shows excellent activity for HER in alkaline medium with a low overpotential of 99.8 mV at 10 mA cm-2, which is close to that of the state-of-the-art Pt/C catalyst. Significantly, the Ni@SNG catalyst is also developed as a binder-free electrode in magnetic field, exhibiting much improved performance than the common Nafion binder-based electrode. Therefore, the magnetism adsorption technique will be a greatly promising approach to overcome the high electron resistance and poor adhesive stability of polymer binder-based electrodes in practical applications. © 2021 American Chemical Society. All rights reserved.
American Chemical Society
Related Researcher
  • Author Yu, Jong-Sung Light, Salts and Water Research Group
  • Research Interests Materials chemistry; nanomaterials; electrochemistry; carbon and porous materials; fuel cell; battery; supercapacitor; sensor and photochemical catalyst
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Department of Energy Science and EngineeringLight, Salts and Water Research Group1. Journal Articles

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