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

Abstract

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.

Graphynes: Electronic Properties, Synthesis, and Applications in Catalysis

“…Catalysts act as a key point in these technologies. Noble metal catalysts possess high catalytic properties and are the main catalysts in practical applications. − Nevertheless, the scarcity, high cost, and low stability of noble metals confine their widespread application for noble metal catalysts, − forcing people to develop replaceable materials, such as metal-free catalysts, , metal–organic frameworks, , metal oxides, metal–nitrogen-coordinated carbon materials, , and Mxene. , Beyond that, carbon-based nanomaterials have aroused more interest because of their particular structure and chemical and physical properties, including carbon nanofiber, , carbon nanotube (CNT), , graphene (GR), , graphitic carbon nitride (g-C 3 N 4 ), ,, and biochar . Carbon-based catalysts have more obvious advantages in stability and durability when compared with other materials, which is attributed to two points: (1) loading nanoparticles (NPs) on conductive carbon matrix can avoid serious agglomeration of metal NPs and enhance the conductivity of catalyst materials; (2) the carbon layer can prevent internal NPs from penetrating the electrolyte, thus avoiding corrosion and oxidation caused by the external factors, which gives the catalysts high durability. , These enable them to be prime candidates for noble metal catalysts …”

Self-Assembly of Pt3Co Superlattice as a Catalyst for Oxygen Reduction Reaction

“…The following supporting information can be downloaded at: https:// www.mdpi.com/article/10.3390/catal13020406/s1, Figure S1 S1: detail electrochemical data of all the catalyst in this paper; Table S2: Performance of catalyst in this work and several representative results with high performance from recent published work [4,6,[49][50][51][52][53][54][55][56][57][58].…”

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

“…[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.…”

“…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] .…”