Edge‐Riched MoSe₂/MoO₂ Hybrid Electrocatalyst for Efficient Hydrogen Evolution Reaction

Abstract

Molybdenum diselenide (MoSe ) is widely considered as one of the most promising catalysts for the hydrogen evolution reaction (HER). However, the absence of active sites and poor conductivity of MoSe severely restrict its HER performance. By introducing a layer of MoO on Mo foil, MoSe /MoO hybrid nanosheets with an abundant edge and high electrical conductivity can be synthesized on the surface of Mo foil. Metallic MoO can improve the charge transport efficiency of MoSe /MoO , thereby enhancing the overall HER performance. MoSe /MoO exhibits fast hydrogen evolution kinetics with a small overpotential of 142 mV versus RHE at a current density of 10 mA cm and Tafel slope of 48.9 mV dec .

Ionic Liquid‐Intercalated Metallic MoS2 as a Superior Electrode for Energy Storage Applications

“…The lowest Tafel slope of 68 mV/dec is observed for 1T‐MoS 2 @CC suggesting the faster kinetics to attain higher current densities with lower over potentials. The observed lower value of the slope indicates that the formation of H 2 molecule over the catalyst surface is occurring through the Volmer‐Heyrovsky mechanism in which the rate limiting step is the combination of H atom with the proton to produce H 2 molecule . The presence of conducting basal plane could improve the kinetics of reaction which might be one of the reason for the observed lower Tafel slope value.…”

“…The observed lower value of the slope indicates that the formation of H 2 molecule over the catalyst surface is occurring through the Volmer-Heyrovsky mechanism in which the rate limiting step is the combination of H atom with the proton to produce H 2 molecule. [44][45] The presence of conducting basal plane could improve the kinetics of reaction which might be one of the reason for the observed lower Tafel slope value. 2H-MoS 2 @CC showed higher Tafel slope of 152 mV/dec which confirms the role of 1T phase along the basal plane for the improvement of HER activity in the case of 1T-MoS 2 @CC.…”

“…Electrochemical active surface area (ECSA) analysis was performed to estimate the number of active sites present on the catalytic surfaces. [44] Cyclic voltammetry was performed to measure the electrochemical double layer capacitance (C dl ) and the results are shown in Figure S9 (Supporting Information). The difference in anodic and cathodic currents (J a -J c ) at potential of 0.1 V vs RHE is plotted against scan rate as shown in Figure 4C.…”

Coupled Biphase (1T‐2H)‐MoSe2 on Mold Spore Carbon for Advanced Hydrogen Evolution Reaction

“…Electrochemical hydrogen evolution reaction (HER) is considered as one of the greenest technologies to produce hydrogen energy . It is well known that the HER efficiency and corresponding energy consumption are largely dependent on the physicochemical & electrochemical properties of electrocatalysts.…”

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energy. [1][2][3][4][5] It is well known that the HER efficiency and corresponding energy consumption are largely dependent on the physicochemical & electrochemical properties of electrocatalysts. Despite excellent HER performance of Pt-and Irbased noble metals, they still cannot be accepted by the market due to their compromised long-term stability, scarcity, and high cost.

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