N-doped monolayer graphene catalyst on silicon photocathode for hydrogen production

Sim, Uk; Yang, Tae‐Youl; Moon, Joonhee; An, Junghyun; Hwang, Jun Gi; Seo, Jung‐Hye; Lee, Jun Young; Kim, Kye Yeop; Lee, Joohee; Han, Seungwu; Hong, Byung Hee; Nam, Ki Tae

doi:10.1039/c3ee42106f

Cited by 131 publications

(81 citation statements)

References 24 publications

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“…It was also observed that a monolayer of graphene with nitrogen moieties could act as an active charge transport layer suppressing the oxidation of the Si photocathodes. Figure 8 shows the enhanced electrocatalytic activity of N-doped graphene as reported by Wang et al 79 and Sim et al 81 Moon et al 82 synthesized blue luminescent graphene quantum sheets by direct nitrogen plasma treatment of CVD graphene on Cu (refer to Figure 9). It is evident from their XPS studies, that the quantum sheets were doped with nitrogen (∼2.7%).…”

Section: Nitrogen Functionalizationmentioning

confidence: 87%

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Plasma engineering of graphene

Dey

Chroneos

Braithwaite

et al. 2016

Applied Physics Reviews

136

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Recently, there have been enormous efforts to tailor the properties of graphene.These improved properties extend the prospect of graphene for a broad range of applications. Plasmas find applications in various fields including materials science and have been emerging in the field of nanotechnology. This review focuses on different plasma functionalization processes of graphene and its oxide counterpart. The review aims at the advantages of plasma functionalization over the conventional doping techniques. Selectivity and controllability of the plasma techniques opens up future pathways for large scale, rapid functionalization of graphene for advanced applications. We also emphasize on atmospheric pressure plasma jet as the future prospect of plasma based functionalization processes.

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Section: Nitrogen Functionalizationmentioning

confidence: 87%

“…The enhanced activity of N doped graphene toward H 2 O 2 electrocatalysis, makes it a promising candidate for glucose biosensing. 79 The photocatalytic activity of nitrogen doped monolayer graphene has been reported by Sim et al 81 A 10 Watt Rf (13.56…”

Section: Nitrogen Functionalizationmentioning

confidence: 99%

Plasma engineering of graphene

Dey

Chroneos

Braithwaite

et al. 2016

Applied Physics Reviews

136

View full text Add to dashboard Cite

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“…In addition, previously reported carbon-based electrocatalysts still exhibit several limitations during the synthesis process. For example, the synthesis of CVD-graphene-based catalysts is significantly expensive and requires multiple gas sources with particular pressure control and multiple transfer processes after the synthesis [34]. (Reduced) graphene oxide-based catalysts are a satisfactory alternative to CVD-graphene-based catalysts; however, their synthesis is time-consuming, toxic, and highly exothermal [36,37].…”

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confidence: 99%

Biopolymer-Inspired N-Doped Nanocarbon Using Carbonized Polydopamine: A High-Performance Electrocatalyst for Hydrogen-Evolution Reaction

2020

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Hydrogen-evolution reaction (HER) is a promising technology for renewable energy conversion and storage. Electrochemical HER can provide a cost-effective method for the clean production of hydrogen. In this study, a biomimetic eco-friendly approach to fabricate nitrogen-doped carbon nanosheets, exhibiting a high HER performance, and using a carbonized polydopamine (C-PDA), is described. As a biopolymer, polydopamine (PDA) exhibits high biocompatibility and can be easily obtained by an environmentally benign green synthesis with dopamine. Inspired by the polymerization of dopamine, we have devised the facile synthesis of nitrogen-doped nanocarbons using a carbonized polydopamine for the HER in acidic media. The N-doped nanocarbons exhibit excellent performance for H 2 generation. The required overpotential at 5 mA/cm 2 is 130 mV, and the Tafel slope is 45 mV/decade. Experimental characterizations confirm that the excellent performance of the N-doped nanocarbons can be attributed to the multisite nitrogen doping, while theoretical computations indicate the promotion effect of tertiary/aromatic nitrogen doping in enhancing the spin density of the doped samples and consequently in forming highly electroactive sites for HER applications.Polymers 2020, 12, 912 2 of 12 candidates has not been reported to date. Clearly, the HER performance of carbon materials is not comparable to that of metal-based catalysts and does not presently conform to the benchmarks [31,35] established by metal-based catalysts. In addition, previously reported carbon-based electrocatalysts still exhibit several limitations during the synthesis process. For example, the synthesis of CVD-graphene-based catalysts is significantly expensive and requires multiple gas sources with particular pressure control and multiple transfer processes after the synthesis [34]. (Reduced) graphene oxide-based catalysts are a satisfactory alternative to CVD-graphene-based catalysts; however, their synthesis is time-consuming, toxic, and highly exothermal [36,37]. Furthermore, carbon sources exert a significant influence on the preparation process and the (electro)chemical properties of the resultant electrocatalyst. Among the potential candidates, polydopamine (PDA) has emerged as a new carbon precursor in recent years [28,[38][39][40][41]. PDA is the self-polymerized product of dopamine, which can be synthesized under mild aqueous conditions simulating marine conditions. Due to the presence of catechol groups, the resultant PDA exhibits strong adhesion to bulk substrates or organic and inorganic materials. Therefore, the PDA does not only serve as the functional layer for many applications [42][43][44] but is also a promising carbon source for the preparation of carbon-based materials. So far, although the structure of the PDA is still under debate, carbonized PDA (C-PDA) has been utilized as nitrogen-doped graphite [40,42].In this study, we demonstrate that through a variety of chemical doping processes-active sites for the HER-can be generated in the C-PDA. Furthe...

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“…Therefore, both the photocurrent density and IPCE of the electrode remarkably improved, which were several times higher than those of the pure inverse opaline hematite photoanode. Sim et al [56] transferred a monolayer graphene prepared by chemical vapor deposition (CVD) to a p-type Si wafer, and investigated the role of graphene as a catalyst for solar-driven HER on this Si photocathode (Figure 7.6). They boosted the catalytic activity of graphene by plasma treatment in a nitrogen ambient, as this treatment can induce abundant defects and incorporate nitrogen atoms into the graphene structure, acting as catalytic sites on graphene.…”

Section: Graphene-based Integrated Photoelectrochemical Cellsmentioning

confidence: 99%

Graphene‐Based Solar‐Driven Water‐Splitting Devices

Gong

2015

Graphene‐based Energy Devices

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IntroductionHuman beings are now experiencing the culmination of a fast growth period in economics and technology. But the huge consumption of fossil fuels and the severe deterioration of the environment have restricted the sustainable development of human society. Sufficiently utilizing clean and renewable energy resources is considered as the ultimate solution to the above issues, and has attracted worldwide interest in recent decades [1].Actually, energy from sunlight that arrives on the earth in 1 h is more than all of the energy consumed by humans in an entire year; thus an affordable future can be certainly achieved if solar energy, the most abundant renewable energy in the earth, is efficiently exploited [2]. However, because of the daily and seasonal variability of sunlight, a cost-effective way in which solar energy can be captured, converted, and stored is highly desired. The most widely recognized method for cost-effective massive energy storage is in the form of chemical bonds. Thus, great attention has been given to the development of highly effective technologies for conversion of solar energy to chemical fuels [3,4].Splitting water into hydrogen and oxygen by using sunlight is a promising approach to solar energy storage [1,4]. Among various technologies, direct photolysis of water upon semiconductors, which was first demonstrated by Fujishima and Honda [5] in 1972, is seen as the best path toward this objective, because it is convenient and cost effective, and has huge potential for further development. Therefore, tremendous efforts have been made during the past 40 years to approach this Holy Grail, that is, solar-driven water splitting [6-10].For realizing solar-driven water splitting, one requires, at the minimum, a light absorber, fuel-forming catalysts, and an electrolyte [11,12]. Among them, the light absorber and the catalysts are the two key components that directly determine the final solar conversion efficiency. Hence, most of the research activities in the field of solar-driven water splitting are centralized on the development of light absorbers and catalysts with high efficiency, long durability, and excellent scalability. Several reviews have comprehensively summarized the current achievements Graphene-based Energy Devices, First Edition. Edited by A. Rashid bin Mohd Yusoff.

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N-doped monolayer graphene catalyst on silicon photocathode for hydrogen production

Cited by 131 publications

References 24 publications

Plasma engineering of graphene

Plasma engineering of graphene

Biopolymer-Inspired N-Doped Nanocarbon Using Carbonized Polydopamine: A High-Performance Electrocatalyst for Hydrogen-Evolution Reaction

Graphene‐Based Solar‐Driven Water‐Splitting Devices

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