Coupling of N‐Doped Mesoporous Carbon and N‐Ti₃C₂ in 2D Sandwiched Heterostructure for Enhanced Oxygen Electroreduction

Abstract

Abstract2D heterostructures provide a competitive platform to tailor electrical property through control of layer structure and constituents. However, despite the diverse integration of 2D materials and their application flexibility, tailoring synergistic interlayer interactions between 2D materials that form electronically coupled heterostructures remains a grand challenge. Here, the rational design and optimized synthesis of electronically coupled N‐doped mesoporous defective carbon and nitrogen modified titanium carbide (Ti3C2) in a 2D sandwiched heterostructure, is reported. First, a F127‐polydopamine single‐micelle‐directed interfacial assembly strategy guarantees the construction of two surrounding mesoporous N‐doped carbon monolayers assembled on both sides of Ti3C2 nanosheets. Second, the followed ammonia post‐treatment successfully introduces N elements into Ti3C2 structure and more defective sites in N‐doped mesoporous carbon. Finally, the oxygen reduction reaction (ORR) and theoretical calculation prove the synergistic coupled electronic effect between N‐Ti3C2 and defective N‐doped carbon active sites in the 2D sandwiched heterostructure. Compared with the control 2D samples (0.87–0.88 V, 4.90–5.15 mA cm−2), the coupled 2D heterostructure possesses the best onset potential of 0.90 V and limited density current of 5.50 mA cm−2. Meanwhile, this catalyst exhibits superior methanol tolerance and cyclic durability. This design philosophy opens up a new thought for tailoring synergistic interlayer interactions between 2D materials.

Pt nanoparticles anchored by oxygen vacancies in MXenes for efficient electrocatalytic hydrogen evolution reaction

“…The introduction of noble metals can ameliorate the electrocatalytic performance of MXene nanosheets. [60][61][62][63] The HER activity of the MXene series catalysts in 0.5 M H 2 SO 4 was investigated and its influencing factors were explored by adjusting the number of electrodeposition cycles, Pt ion concentration and MXene precursors treated with different annealing temperatures. Fig.…”

“…The introduction of noble metals can ameliorate the electrocatalytic performance of MXene nanosheets. 60–63…”

2D MXene Ti3C2 Coupled with 1D Co3O4 Nanowires on Carbon Cloth for Efficient Chlorine Evolution Activity

“…Layered 2D transition metal carbides (2D MXene) are obtained by the selective removal of the A-layers by MAX. [17][18][19][20][21] MXene possess superior metallic conductivity, diverse chemical functionalization of surfaces, and outstanding hydrophilicity, making them promising candidates for highly efficient electrocatalysis. [22][23][24][25] Ti 3 C 2 with a negatively-charged surface provides an attractive platform for constructing confined hybrid electrocatalysts with well-organized nanostructures and strong interfacial interactions, favoring the optimization of active centers of electrocatalysts.…”

Multilayer Ti3C2‐CNTs‐Au Loaded with Cyclodextrin‐MOF for Enhanced Selective Detection of Rutin

“…Notably, the modification means of combining Ti 3 C 2 with carbon nanomaterials can not only stabilize the interlayer structure but also reduce the degree of aggregation between Ti 3 C 2 lamellae, which opens up new directions for Ti 3 C 2 as a sensing material. [18] For instance, Huang et al [19] have used multi-walled carbon nanotubes (CNTs) as spacers to improve the aggregation of Ti 3 C 2 , and the constructed sensor exhibits good detection performance for catechol and hydroquinone. In addition, gold nanoparticles (AuNPs) have small particle sizes and high surface-to-volume ratios, which increase the electrochemically active surface area and contribute to the rapid diffusion of electrolytes.…”