Tuning active sites on cobalt/nitrogen doped graphene for electrocatalytic hydrogen and oxygen evolution

Zhang, Yijie; Li, Wanfei; Lu, Luhua; Song, Weiguo; Wang, Chunru; Zhou, Lisha; Liu, Jinghai; Chen, Ying; Jin, Hongyun; Zhang, Yuegang

doi:10.1016/j.electacta.2018.01.203

Cited by 59 publications

(43 citation statements)

References 65 publications

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“…Individual Co atoms immobilized on N‐doped graphene (Co−NG) was also reported by Lu, Liu, Zhang, and co‐workers . Single Co atoms could be detected in the HAADF‐STEM image (Figure a).…”

Section: Her Applications Of Sacssupporting

confidence: 68%

Single‐Atom Catalysts for the Hydrogen Evolution Reaction

2018

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Electrocatalytic hydrogen evolution reaction (HER) is recognized as a promising way to generate clean hydrogen energy. However, its large-scale application requires the development of cheap and efficient catalysts. An increasing number of reports have been published lately on the HER over single atom catalysts (SACs) owing to the high catalytic activity, stability and maximum atom utilization of SACs, of which the final point endows noble-metal catalysts with low costs. In this Review, we highlight the electrochemical applications of all reported SACs in the HER, with a particular focus on the discussion of their catalytic properties and mechanisms at the atomic level. The main advantages and challenges of SACs are also summarized. This Review aims to provide a comprehensive understanding of current and future applications of SACs in the HER.

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Section: Her Applications Of Sacssupporting

confidence: 68%

Single‐Atom Catalysts for the Hydrogen Evolution Reaction

2018

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“…Two main peaks were further shift to 60.6 and 63.4 eV. As has been shown in Figure 3D [39] were observed for NG@IrCo/NG-1510-8. In compared with deconvoluted Co2p spectrum of NG@Co/NG-510-8 (Figure S2A), it was found that peak intensity of Co 0 for NG@IrCo/NG-1510-8 was largely increased, which has also been observed in Co2p of NG@IrCo/NG-5510-8 with increased Ir dosage ( Figure S2B).…”

Section: Synthesis and Nomenclaturesupporting

confidence: 62%

“…Our recent research has revealed that Co atoms have strong interaction with carbon and especially nitrogen on basal plane of nitrogen-doped graphene. [39] In this work, the dosage of Co is high and thus Co atoms on nitrogen-doped graphene basal plane have aggregated into particles. Similarly, Ir was found in Co-rich nanoparticles.…”

Section: Synthesis and Nomenclaturementioning

confidence: 84%

“…The catalyzed formation of few layer nitrogen-doped graphene from urea by metal nanoparticles was recently demonstrated by us. [39] By using high-angle annular dark-field scanning transmission electron microscope (HAADF-STEM) image ( Figure 1DÀ G), the dispersion of Co and Ir on basal plane of nitrogen-doped graphene can be clearly observed. Our recent research has revealed that Co atoms have strong interaction with carbon and especially nitrogen on basal plane of nitrogen-doped graphene.…”

Section: Synthesis and Nomenclaturementioning

confidence: 99%

“…Previous works have shown that electron withdraw from carbon atom via it neighbor pyridinic nitrogen that bonded with metal is crucially important to achieve high HER activity. [39,44] In compared with weak electron withdraw from pyridinic nitrogen that is bonded to Co atoms to its neighbor carbon atoms via CoÀ NÀ C, [39,44] IrÀ Co-NÀ C with Ir of slightly higher electronegativity has strengthened electron withdraw from active carbon to neighbor pyridinic nitrogen atoms and thus the IrCo alloy nanoparticle can be more appropriately tune electron density of carbon in graphene shell to achieve desired catalytic active of carbon atoms on surface of nitrogen-doped graphene. [26,39,44,45] Based on above analysis, we can deduce that formation of IrCo alloy particles and doping nitrogen on basal plane of graphene, which have improved dispersion of Iridium atoms in catalyst, have synthetically enhanced HER activity of NG@IrCo/NG-1150-8.…”

Section: Synthesis and Nomenclaturementioning

confidence: 99%

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Nitrogen‐doped Graphene Chainmail Wrapped IrCo Alloy Particles on Nitrogen‐doped Graphene Nanosheet for Highly Active and Stable Full Water Splitting

Zhang

et al. 2019

ChemCatChem

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Electrocatalysts have been used to split water into hydrogen and oxygen for their advantages in clean energy technologies. To reduce cost and enhance stability of electrocatalysts, intensive works have been done in recent decades. Although research on noble‐metal free electrocatalysts has achieved great progress, their full water splitting performance is still incomparable to that of noble metal based catalysts. For this reason, reducing content of noble metal in catalysts is a more practical way. In this work, we report our recent progress on developing bifunctional electrocatalyst based on nitrogen‐doped graphene chainmail wrapped IrCo alloy particles on nitrogen‐doped graphene (NG@IrCo/NG). Benefited from strong interaction among iridium, cobalt and nitrogen‐doped graphene, impressively high electrocatalytic activity of hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) in both acid and alkaline solutions, which are comparable to commercially used Pt/C and IrO2 electrocatalysts respectively, is found. Catalyst with the structure of nitrogen doped chainmail wrapping on metal core is found to have highly stable full water splitting performance.

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Earth‐Abundant Metal‐Based Nanomaterials for Electrochemical Water Splitting

Zheng

Lee

2022

Functional Nanomaterials

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Tuning active sites on cobalt/nitrogen doped graphene for electrocatalytic hydrogen and oxygen evolution

Cited by 59 publications

References 65 publications

Single‐Atom Catalysts for the Hydrogen Evolution Reaction

Single‐Atom Catalysts for the Hydrogen Evolution Reaction

Nitrogen‐doped Graphene Chainmail Wrapped IrCo Alloy Particles on Nitrogen‐doped Graphene Nanosheet for Highly Active and Stable Full Water Splitting

Earth‐Abundant Metal‐Based Nanomaterials for Electrochemical Water Splitting

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