Molybdenum Disulfide Nanosheets Decorated with Platinum Nanoparticle as a High Active Electrocatalyst in Hydrogen Evolution Reaction

Abstract

Electrochemical hydrogen evolution reaction (HER) refers to the process of generating hydrogen by splitting water molecules with applied external voltage on the active catalysts. HER reaction in the acidic medium can be studied by different mechanisms such as Volmer reaction (adsorption), Heyrovsky reaction (electrochemical desorption) or Tafel reaction (recombination). In this paper, facile hydrothermal methods are utilized to synthesis a high-performance metal-inorganic composite electrocatalyst, consisting of platinum nanoparticles (Pt) and molybdenum disulfide nanosheets (MoS2) with different platinum loading. The as-synthesized composite is further used as an electrocatalyst for HER. The as-synthesized Pt/Mo-90-modified glassy carbon electrode shows the best electrocatalytic performance than pure MoS2 nanosheets. It exhibits Pt-like performance with the lowest Tafel slope of 41 mV dec−1 and superior electrocatalytic stability in an acidic medium. According to this, the HER mechanism is related to the Volmer-Heyrovsky mechanism, where hydrogen adsorption and desorption occur in the two-step process. According to electrochemical impedance spectroscopy analysis, the presence of Pt nanoparticles enhanced the HER performance of the MoS2 nanosheets because of the increased number of charge carriers transport.

Carbon Aerogels Loaded with Noble Metal Nanocrystal Electrocatalysts for Efficient Full Water Splitting

“…The obtained hydrogel-like material was freeze-dried at −48 °C for 1 day until it became aerogel-like. The obtained aerogels got calcined in 450 °C for 2 h in a muffle furnace, the similar reduction processes also have been reported . CG-Pt-0.56%, CG-Pt-0.74%, CG-Pt-1.19%, and CG-Pt-1.79% were obtained.…”

“…The obtained aerogels got calcined in 450 °C for 2 h in a muffle furnace, the similar reduction processes also have been reported. 40 CG-Pt-0.56%, CG-Pt-0.74%, CG-Pt-1.19%, and CG-Pt-1.79% were obtained. Similar to the CG-Pt-X, 10, 30, 50, and 70 μL of chloroiridic acid solution (1 mol/L) were added to 100 mL of PEI-PDA/CNCs solution, respectively.…”

In situ electrochemical metal (Co, Ni) oxide deposition on MoS2 nanosheets for highly efficient electrocatalytic water splitting

“…Thus, they also function as effective supporting materials to efficiently decorate highly catalytically active species such as Pt nanoparticles to obtain HER catalytic activity. [15][16][17] First-row transition metals have been found to be potential candidates for hydrogen evolution in the electrochemical HER. For OER electrocatalysts, Co 3 O 4 as a promising candidate has received significant attention.…”

“…Thus, they also function as effective supporting materials to efficiently decorate highly catalytically active species such as Pt nanoparticles to obtain HER catalytic activity. 15–17…”

Controlled Synthesis of Platinum and Silver Nanoparticles Using Multivalent Ligands

“…In the emerging and attractive world of nanomaterials, nanosized particles of noble metals (platinum, silver, and gold) have attracted much attention in recent years due to their applications in various fields, such as catalysis [1][2][3][4], optics [5][6][7], biological applications [8][9][10][11][12][13], and biosensors [14][15][16][17][18]. Platinum nanoparticles (PtNPs) have shown unique and promising electrocatalytic properties in fuel cells [19][20][21][22]; nonlinear optical properties [23,24] in electronic devices [25,26]; as electrochemical biosensors for the detection of aquatic products [27], glucose [28], and glutamate in food products [29], and for the detection of reactive oxygen species [30,31]. Like PtNPs, silver nanoparticles (AgNPs) have also received much attention in the fields of catalysis in organic synthesis [32][33][34], optics [35,36], and antibacterial agents [37][38][39][40], and in biomedical devices [41][42][43].…”