synthesis of MoS/graphene nanosheets as free-standing and flexible electrode paper for high-efficiency hydrogen evolution reaction.

RSC Adv

Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials, Hubei Key Laboratory of Ferro & Piezoelectric Materials and Devices, Faculty of Physics & Electronic Sciences, Hubei University Wuhan 430062 P. R. China

Published: March 2018

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Biphasic 1T/2H-MoS Nanosheets In Situ Vertically Anchored on Reduced Graphene Oxide via Covalent Coupling of the Mo-O-C Bond for Enhanced Electrocatalytic Hydrogen Evolution.

ACS Appl Mater Interfaces

December 2024

Hebei Key Laboratory of Applied Chemistry, State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, China.

Transition-metal dichalcogenides (TMDs) have recently emerged as promising electrocatalysts for the hydrogen evolution reaction owing to their tunable electronic properties. However, TMDs still encounter inherent limitations, including insufficient active sites, poor conductivity, and instability; thus, their performance breakthrough mainly depends on structural optimization in hybridization with a conductive matrix and phase modulation. Herein, a 1T/2H-MoS/rGO hybrid was rationally fabricated, which is characterized by biphasic 1T/2H-MoS nanosheets in situ vertically anchored on reduced graphene oxide (rGO) with strong C-O-Mo covalent coupling.

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Article Synopsis
  • Metal sulfide-based composites, particularly NiFeS@MoS@rGO, are being researched for their performance as electrodes in supercapacitors due to their high conductivity and electrochemical properties.
  • The synthesized nanocomposite achieved an impressive specific capacitance of 3188 F/g when tested in a three-electrode cell with a KOH electrolyte.
  • The resulting supercapattery design, combining NiFeS@MoS@rGO with activated carbon, demonstrated strong energy and power density, stable performance over 30,000 cycles, and potential for powering portable electronics.
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An electrochemical biosensor was created to identify the liver cancer marker alpha-fetoprotein (AFP) by employing nanocomposite materials. A combination of reduced graphene oxide (rGO) and molybdenum disulfide (MoS) was selected as the substrate material for the sensor to prepare the PtNPs/MoS@rGO electrochemical immunosensor. Among them, rGO has strong conductivity and MoS provides a large surface area for the anchoring of PtNPs for better attachment to the hybridized nanomaterials.

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Article Synopsis
  • Creating lightweight, stable surfaces is essential for reliable energy devices, and aerogel-based electrocatalysts show promise for hydrogen production due to their unique properties.
  • The study presents a simple method for synthesizing a nanorod-like molybdenum sulfide-reduced graphene oxide (M-rG) aerogel, designed for the hydrogen evolution reaction (HER).
  • The M-rG-300 aerogel demonstrated impressive performance with a low overpotential and enhanced reliability, which is linked to effective connectivity between its components, leading to a larger active surface area and better electrocatalytic properties.
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The development of MoS as a cathode electrocatalyst for lithium-oxygen batteries (LOBs) has attracted considerable attention due to its natural abundance, excellent catalytic activity, and chemical stability. However, the sluggish and complicated kinetic of insulating and bulk discharge products on the electrode surface is one of major factors for MoS as a cathode for high performance LOBs. Defect engineering of an electrocatalyst and its hybridization with highly conductive frameworks are effective strategies to address this critical issue.

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