Shape inducer-free polygonal angle platinum nanoparticles in graphene oxide as oxygen reduction catalyst derived from gamma irradiation

Wang, Wei; Zhao, Xiaomeng; Shi, Haiting; Liu, Liangsen; Deng, Hui; Xu, Zhiwei; Tian, Feng; Miao, Xiaran

doi:10.1016/j.jcis.2020.04.036

Cited by 24 publications

(4 citation statements)

References 63 publications

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“…[6,7] Two-dimensional (2D) semiconductors have attracted enormous research interest in photocatalysis due to merits such as large surface area and abundant surface low-coordination atoms. [8][9][10][11] In addition, the smaller atomic thickness in 2D semiconductors can shorten the carrier migration distance. [12] Whereas, the photogenerated charge separation in 2D semiconductors always challenged by serious charge recombination, which significantly limits the photocatalytic activity.…”

Section: Introductionmentioning

confidence: 99%

“…Among various approaches access to hydrogen sources, photocatalytic hydrogen production via water splitting has been considered as one of environment‐friendly and effective strategies by utilizing sunlight and water [6,7] . Two‐dimensional (2D) semiconductors have attracted enormous research interest in photocatalysis due to merits such as large surface area and abundant surface low‐coordination atoms [8–11] . In addition, the smaller atomic thickness in 2D semiconductors can shorten the carrier migration distance [12] .…”

Section: Introductionmentioning

confidence: 99%

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Continuous Charge Transport in Carbon Nitride Modulated by Interfacial Chemical Bond and Homophase Junction to Boost Photocatalytic Hydrogen Production

Zhang

Luo

Chen

et al. 2022

Chemistry A European J

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Efficient separation of photogenerated electrons and holes is of key importance in photocatalysis. Tuning the charge separation pathway is significant but still suffering from low efficiency for the charge extraction from semiconductors. Herein, taking 2D g-C 3 N 4 (CN) nanosheets as a model photocatalyst, it was found the decoration of homophase junction between brookite TiO 2 rods and nanoparticles (B N -B R ) onto CN can effectively modulate photogenerated charge extraction and transfer in B N -B R /CN composites. The B N -B R /CN exhibits a remarkably enhanced photocatalytic H 2 evolution under visible light irradiation (λ > 420 nm) compared with the single component. A continuous electron transfer channel constructed by an interfacial chemical bond TiÀ OÀ N between CN and brookite rods (B R ) and B N -B R homophase junction between brookite nanoparticles and rods was proposed to benefit the charge extraction and transfer. This work provides a strategy to tune the charge separation and transfer to facilitate the photocatalytic performance in heterogeneous photocatalysis.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Continuous Charge Transport in Carbon Nitride Modulated by Interfacial Chemical Bond and Homophase Junction to Boost Photocatalytic Hydrogen Production

Zhang

Luo

Chen

et al. 2022

Chemistry A European J

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“…Then the platinum nanoparticles were loaded on the surface of CN-CB + by gamma irradiation. Three-dimensional spherical-like structures were formed through the above two steps [34][35][36][37]. Meanwhile, charge decorated carbon black pellets are embedded in the interspaces of CN, which can enhance the electron transport.…”

Section: Introductionmentioning

confidence: 99%

Carbon nitride/positive carbon black anchoring PtNPs assembled by γ-rays as ORR catalyst with excellent stability

et al. 2021

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Electrocatalytic performance of low-cost graphitic carbon nitride (CN) is greatly limited by its limited conductivity and small specific surface area. Herein, a simple and cost-effective idea to produce novel nanocomposite is constructed by the CN and cetyl trimethyl ammonium bromide functionalized carbon black (CB) anchored platinum nanoparticles as highly efficient oxygen reduction catalysts based on gamma irradiation. The assembled carbon nitride/positive carbon black anchoring PtNPs (Pt/CN2-CB+ 1) catalyst exhibits significantly improved specific surface area, high graphitization, and uniformly dispersed ultra-small platinum nanoparticles. For the oxygen reduction reaction (ORR) performance, the catalyst shows more positive onset-potential (0.93 V versus RHE) and larger diffusion limiting current density (5.65 mA cm−2) compared with benchmark Pt/C catalysts in alkaline medium. Moreover, the Pt/CN2-CB+ 1 catalyst exhibits a small Tafel slope (92 mV dec−1). Besides, the catalyst was demonstrated the remarkable methanol tolerance and good long-term stability under working conditions. This work provides a new and effective γ-rays irradiation for synthesizing the carbon nitride catalysts for energy conversion and storage applications.

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“…Carbon supports − have frequently been used to support Pt and exhibit excellent electrocatalytic ORR performances. Among the carbon supports studied, one-dimensional (1D) carbon nanotubes/nanowires/nanofibers − and two-dimensional (2D) graphene/carbon nanosheets − were preferred due to their higher specific surface area. However, the agglomeration stemming from Pt NPs anchored on carbon supports occurs due to aggregation from the stacking of supports with each other, resulting in a significant reduction in ORR activity and durability.…”

Section: Introductionmentioning

confidence: 99%

Ionic Liquid-Derived Ultrafine Pt Nanoparticles with a Uniformly Dispersed State for Long-Life Oxygen Electroreduction

Song

Wang

2021

ACS Sustainable Chem. Eng.

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Ultrafine Pt nanoparticles (NPs) homogeneously anchored on hollow carbon nanoshells (PtIL-HCNs) via a wet-chemistry reduction of a new type of imidazolium-[PtCl6]2– ionic liquid (IL) are reported. Confined [PtCl6]2– in IL molecules effectively prevents the growth and spontaneous aggregation of the Pt NPs due to the electrochemical neutrality of the IL, resulting in a homogeneously dispersed state of Pt NPs. The PtIL-HCNs with a Pt loading of 22 wt % outperform the commercial Pt/C (40 wt %) in terms of oxygen reduction reaction (ORR) activity and durability. The half-wave potential of PtIL-HCNs is 51 mV more positive than that of the commercial Pt/C in 0.1 M HClO4. An electrochemical surface area of 97 m2 mg–1 Pt and specific mass activity of 475 mA mg–1 Pt of PtIL-HCNs were found to be 5.6 and 2.7 times higher than those on the commercial Pt/C. Furthermore, this work demonstrates that unlike one-dimensional (1D) carbon nanotubes and two-dimensional (2D) reduced oxide graphene, the three-dimensional (3D) HCN support plays an indispensable role in preventing any stacking of Pt NPs, leading to significantly enhanced ORR activity and durability.

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Shape inducer-free polygonal angle platinum nanoparticles in graphene oxide as oxygen reduction catalyst derived from gamma irradiation

Cited by 24 publications

References 63 publications

Continuous Charge Transport in Carbon Nitride Modulated by Interfacial Chemical Bond and Homophase Junction to Boost Photocatalytic Hydrogen Production

Continuous Charge Transport in Carbon Nitride Modulated by Interfacial Chemical Bond and Homophase Junction to Boost Photocatalytic Hydrogen Production

Carbon nitride/positive carbon black anchoring PtNPs assembled by γ-rays as ORR catalyst with excellent stability

Ionic Liquid-Derived Ultrafine Pt Nanoparticles with a Uniformly Dispersed State for Long-Life Oxygen Electroreduction

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