Insertion of Platinum Nanoparticles into MoS2 Nanoflakes for Enhanced Hydrogen Evolution Reaction

Abstract

Pt as a chemical inert metal has been widely applied as the counter electrode in various electrochemical measurements. However, it can also be dissolved and redeposit to the working electrode under certain electrochemical circumstances. Herein we demonstrated a cyclic voltammetry (CV) cycling method to synthesize a catalyst comprising inserted Pt nanoparticles into MoS2 nanoflake stack structures on stainless steel mesh (SSM). The binder-free composite structure exhibits significantly enhanced hydrogen evolution reaction (HER) catalytic activity with an overpotentials of 87 mV at 10 mA cm−2. The deposited Pt nanoparticles significantly enhance the catalytic activity through changing the structure of MoS2 and increasing the amount of active sites. This work provides a new way forward for rational design of the nano-electrocatalysts.

Electrodeposition of PdPt Nanoparticles on Edges and S‐Vacancies in Exfoliated MoS2 Nanosheets for Enhanced Hydrogen Evolution Activity

“…The values for η (measured at 10 mA cm À 2 ) and the Tafel slope for the PdPt/MoS 2-x @4k catalyst prepared in this study surpassed the performance of previously reported MoS 2 and PGM based catalysts (Figure 4c). [7,[10][11][12][23][24][25][26][27][28][29][30][31] The higher HER activity of the PdPt/MoS 2-x @4k catalyst in comparison to the previously reported Pt-based and Pd-based MoS 2 catalysts signifies the importance of the methods used for exfoliation, desulfurization, and metal deposition to create catalysts that are stabilized by vacancies in the support material that also help promote an efficient transport and transformation of SO 4 for the series of electrocatalysts that were each supported on separate glassy carbon, working electrodes and rotated at 1600 rpm. These plots were used to determine the onset potentials for each sample towards the HER, as well as the overpotential for each catalyst at 10 mA cm À 2 .…”

“…(b) Tafel plots, derived from the series of LSV plots in (a), for each of the catalysts. (c) A comparison of the HER activity as assessed using the Tafel slopes (mV dec À 1 ) versus the overpotential at a current density of 10 mA cm À 2 for a series of MoS 2 supported electrocatalysts, [7,[10][11][12][23][24][25][26][27][28][29][30][31] a commercial carbon supported Pt nanocatalyst (comm. Pt/C), and the results of the PdPt/MoS 2-x @4k sample prepared in this study.…”

“…[21,22] Incorporating PGMs onto the MoS 2 nanosheets have been reported to improve charge transport and conductivity, thereby reducing the HER overpotentials. [10,[23][24][25][26][27][28][29][30] Recently, palladium (Pd) and Pt metals were each added to the surfaces of MoS 2 to seek a nanocatalyst with improved activity toward the HER. [31] Samples of Pd supported on 2H-MoS 2 (Pd/ MoS 2 ) were synthesized via a hydrothermal method, and Pt was subsequently electrodeposited onto this sample.…”

The synthesis of W–Ni3S2/NiS nanosheets with heterostructure as a high-efficiency catalyst for urea oxidation

“…Due to the diversity, stability and theoretically high catalytic activity of transition metals, recent research has focused on transitionmetal-based electrocatalysts. [29][30][31] It has been shown that nickel sulfide, 32,33 especially its composites with other metal sulfides, has superior UOR properties. For example, Liu et al prepared catalysts with efficient UOR catalytic activity via in situ growth of multistage nickel sulfide composites on nickel foam with a potential of only 1.343 V at a current density of 10 mA cm −2 .…”

Covalent Decoration of MoS2 Platforms by Silver Nanoparticles through the Reversible Addition–Fragmentation Chain Transfer Reaction

“…The main strategy in a noncovalent method is in situ synthesis of metal nanoparticles/MoS 2 hybrids in which metal nanoparticles are synthesized in the presence of MoS 2 sheets . This is a straightforward and efficient strategy in which metal nanoparticles are nucleated and then attached onto MoS 2 sheets. − For example, gold nanoparticles or their core@shell structures have been incorporated onto MoS 2 sheets by sulfur/noble-metal binding to raise the effective gate voltage or to induce a catalytic effect. , A higher density of gold nanoparticles has been found in defect sites and edges of MoS 2 sheets . MoS 2 /gold nanoparticles constructed by this method have been used as efficient electrochemical sensors …”