N-doped graphene quantum sheets on silicon nanowire photocathodes for hydrogen production

Sim, Uk; Moon, Joonhee; An, Junghyun; Kang, Jingu; Jerng, Sung Eun; Moon, Jung Hwan; Cho, Sung‐Pyo; Hong, Byung Hee; Nam, Ki Tae

doi:10.1039/c4ee03607g

Cited by 140 publications

(108 citation statements)

References 47 publications

(100 reference statements)

Supporting

Mentioning

105

Contrasting

Order By: Relevance

“…In a similar work by Sim et al 83 it was suggested that, these nitrogen doped graphene quantum sheets act as a catalyst for photocataytic hydrogen evolution on Si nanowire photocathodes. Here the time of plasma exposure being 12 seconds only.…”

Section: Nitrogen Functionalizationmentioning

confidence: 95%

Plasma engineering of graphene

Dey

Chroneos

Braithwaite

et al. 2016

Applied Physics Reviews

137

View full text Add to dashboard Cite

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.

show abstract

Section: Nitrogen Functionalizationmentioning

confidence: 95%

Plasma engineering of graphene

Dey

Chroneos

Braithwaite

et al. 2016

Applied Physics Reviews

137

View full text Add to dashboard Cite

show abstract

“…Subsequent studies were aimed at deeper understanding of the enhancement mechanism and performance optimization of N‐GQSs/Si photocathodes. Nam, Hong, and co‐workers designed an electrode based on a Si nanowire array possessing abundant nanostructures and then decorated the array with N‐GQSs for PEC measurements ( Figure ) . In the photo‐electrocatalytic measurements, the nanostructured Si/N‐GQS hybrids gave higher onset potentials and current densities compared to planar Si/N‐GQS hybrids and pure Si‐nanowire arrays.…”

Section: Photocatalytic Hydrogen Evolutionmentioning

confidence: 99%

Smart Utilization of Carbon Dots in Semiconductor Photocatalysis

et al. 2016

View full text Add to dashboard Cite

Efficient capture of solar energy will be critical to meeting the energy needs of the future. Semiconductor photocatalysis is expected to make an important contribution in this regard, delivering both energy carriers (especially H ) and valuable chemical feedstocks under direct sunlight. Over the past few years, carbon dots (CDs) have emerged as a promising new class of metal-free photocatalyst, displaying semiconductor-like photoelectric properties and showing excellent performance in a wide variety of photoelectrochemical and photocatalytic applications owing to their ease of synthesis, unique structure, adjustable composition, ease of surface functionalization, outstanding electron-transfer efficiency and tunable light-harvesting range (from deep UV to the near-infrared). Here, recent advances in the rational design of CDs-based photocatalysts are highlighted and their applications in photocatalytic environmental remediation, water splitting into hydrogen, CO reduction, and organic synthesis are discussed.

show abstract

“…More importantly, it is noteworthy that carbon materials can be engineered to exhibit specific catalytic capabilities for specific electrocatalytic reactions by varying the doping types, sites, and levels [21][22][23][27][28][29][30][31]. Although some of these have recently been developed as HER electrocatalysts [32][33][34], the employment of carbon-based nanomaterials as high-performance [38], (b) schematic showing the steps of the C-PDA film transfer onto Si wafer, (c) and the scheme of synthesis of N-doped carbon using dopamine as a precursor [50][51][52].…”

Section: Introductionmentioning

confidence: 99%

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

2020

Self Cite

View full text Add to dashboard Cite

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...

show abstract

N-doped graphene quantum sheets on silicon nanowire photocathodes for hydrogen production

Cited by 140 publications

References 47 publications

Plasma engineering of graphene

Plasma engineering of graphene

Smart Utilization of Carbon Dots in Semiconductor Photocatalysis

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

Contact Info

Product

Resources

About