Self-assembled nitrogen-doped graphene quantum dots (N-GQDs) over graphene sheets for superb electro-photocatalytic activity
- Authors
- Riaz, Rabia; Ali, Mumtaz; Sahito, Iftikhar Ali; Arbab, Alvira Ayoub; Maiyalagan, T.; Anjum, Aima Sameen; Ko, Min Jae; Jeong, Sung Hoon
- Issue Date
- Jun-2019
- Publisher
- ELSEVIER SCIENCE BV
- Keywords
- Reduced graphene oxide; Nitrogen doped graphene quantum dots; Carbon fabric; Flexible; Electro-photocatalysis
- Citation
- APPLIED SURFACE SCIENCE, v.480, pp.1035 - 1046
- Indexed
- SCIE
SCOPUS
- Journal Title
- APPLIED SURFACE SCIENCE
- Volume
- 480
- Start Page
- 1035
- End Page
- 1046
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/2902
- DOI
- 10.1016/j.apsusc.2019.02.228
- ISSN
- 0169-4332
- Abstract
- Nitrogen-doped graphene quantum dots (N-GQDs) are emerging electroactive and visible light active organic photocatalysts, known for their high stability, catalytic activity and biocompatibility. The edge surfaces of N-GQDs are highly active, however, when N-GQDs make the film the edges are not fully exposed for catalysis. To avoid this issue, the N-GQDs are shaped to branched leaf shape, with an extended network of voids, offering highly active surfaces (edge) exposed for electrocatalytic and photocatalytic activity. The nitrogen doping causes a decrease in the bandgap of N-GQDs, thus enabling them to be superb visible light photocatalyst, for degradation of Methylene blue dye from water. Photoluminescence results confirmed that by a synergistic combination of the highly conductive substrate; Carbon fabric coated graphene sheets (CF-rGO) the recombination of photogenerated excitons is significantly suppressed, hence enabling their efficient utilization for catalysis. Comparatively, uniformly coated N-GQDs showed 49.3% lower photocatalytic activity, owing to their hidden active sites. The degradation was further boosted by 30% by combining the electrocatalytic activity, i.e. electro-photocatalysis of the proposed electrode. The proposed electrode material was analyzed using TEM, FE-SEM, FTIR, AFM, and WA-XRD, whereas the stability of electrode was confirmed by TGA, tensile test, bending test, and in harsh chemical environments. The proposed photo-electrocatalyst electrode is binder-free, stable, flexible and highly conductive, which makes the electrode quite suitable for flexible catalytic devices like flexible solar cells and wearable supercapacitors.
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