Heterostructured MoSe₂/Oxygen-Terminated Ti₃C₂ MXene Architectures for Efficient Electrocatalytic Hydrogen Evolution

Abstract

atomically thin transition metal dichalcogenide MoSe 2 has been identified as one of the highly active noble-metal-free catalysts for the electrocatalytic hydrogen evolution reaction (HER), owing to its excellent electronic property and rich active sites. However, the electrocatalytic hydrogen-evolving activity is still hindered by its moderate conductivity, arising from semiconducting property and the thermodynamically stable basal plane. It is anticipated that the integration of 2D MoSe 2 nanosheets with a highly conductive largearea 2D substrate enables the accelerated interfacial electron transfer and the enhanced HER performance. We report herein a facile and scalable fabrication of 2D MoSe 2 /2D Ti 3 C 2 MXene heterostructured architecture, where the layered MoSe 2 nanosheets are in situ decorated on the exfoliated oxygen-terminated Ti 3 C 2 MXene flakes. In comparison to pristine MoSe 2 and the MoSe 2 /unmodified Ti 3 C 2 MXene hybrids, the composite electrocatalysts of MoSe 2 nanosheets and oxygen-terminated Ti 3 C 2 MXene exhibited improved HER activities, owing to higher electrochemically active surface areas, an oxygen-substituted surface, and the synergy effect between nanosized MoSe 2 and oxygen-terminated MXene nanosheets. This study serves to promote continuous efforts toward low-cost, highperformance HER electrocatalysts by taking advantage of merits of transition metal dichalcogenides and 2D nanostructures.

In situ sulfuration synthesis of heterostructure MoS2–Mo2C@C for boosting the photocatalytic H2 production activity of TiO2

“…3C-a) exhibits the typical Mo-C (228.6, 231.8 eV) and Mo-O (229.2, 232.5 eV) bonds. 45,46 With in situ sulfuration, new peaks of S 2s (226.7 eV) and Mo-S bonds are observed in all of the MoS 2 -Mo 2 C@C samples. 47 Moreover, with the increasing sulfuration temperature, the typical signals of Mo-S gradually increase, while the characteristic peaks of Mo-C gradually decrease.…”

Nano‐MOF‐5 (Zn) Derived Porous Carbon as Support Electrocatalyst for Hydrogen Evolution Reaction

“…[58,65] FeÀ Pt/PC electrocatalyst has lower resistance than the other investigated catalyst, which reveal the fast electron transport rate between the interface and exhibiting an excellent HER activity in alkaline medium. [66][67] To further evaluate the intrinsic catalytic activities of FeÀ Pt/PC, turn over frequencies (TOFs) were calculated and shown in Figure 9d. The higher TOF value of the FeÀ Pt/PC indicates that it is more beneficial for HER activity than other catalysts.…”

Hydrogen evolution reaction mechanism on Ti3C2 MXene revealed by in situ/operando Raman spectroelectrochemistry

“…This reaction provides a major upgrade in that the only reagents are water and a properly selected electrocatalyst that is able to overcome the sluggish kinetics. 4…”

“…This reaction provides a major upgrade in that the only reagents are water and a properly selected electrocatalyst that is able to overcome the sluggish kinetics. 4 The current benchmark catalyst for the HER is platinum supported on carbon (Pt/C), which due to the high cost and low availability of Pt, could be limited to only small-scale H 2 productions. 5 To this end, many research efforts have been focused on developing new catalyst systems that can reach similar performance, but at significantly lower costs.…”