Polythionine Coated on Au/Co3O4 Enhances the Performance for Hydrogen Evolution Reaction

NANO ◽  
2021 ◽  
pp. 2150055
Author(s):  
Xiaolin Zhong ◽  
Jianzhi Huang ◽  
Min Wang ◽  
Lishi Wang
Keyword(s):  
Cyclic Voltammetry ◽  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Electrocatalytic Activity ◽  
Effective Strategy ◽  
One Pot ◽  
Tafel Slope ◽  
Reduced Graphene ◽  
Metal Metal ◽  
Polymer Metal

Developing a general, green and effective strategy to improve the hydrogen evolution reaction (HER) electrocatalyst is urgently needed but challenging. Herein, we report a novel conducting polymer/metal/metal oxide composite as HER catalyst prepared by a two-step strategy, in which the Au/Co3O4 is synthesized by a one-pot hydrothermal method, subsequently, cyclic voltammetry is employed to electropolymerize polythionine on the Au/Co3O4. It is demonstrated that the HER electrocatalytic activity of Au/Co3O4 is effectively improved by the coating polythionine layer. The optimal polythionine/Au/Co3O4 displays an excellent electrocatalytic ability towards HER with an overpotential of 168[Formula: see text]mV at [Formula: see text] and low Tafel slope of 79[Formula: see text]mV[Formula: see text]dec[Formula: see text] in 0.5[Formula: see text]M H2SO4, which is greatly superior to those of the Au/Co3O4 (an overpotential of 300[Formula: see text]mV at [Formula: see text] and tafel slope of [Formula: see text]. Interestingly, the HER performance of N-doped reduced graphene (N-rGO) can also be significantly boosted by the coating polythionine layers, indicating the multifunctionality of polythionine in the enhancement of HER performance of nano electrocatalysts.

scholarly journals Catalytic synergy effect of MoS2/reduced graphene oxide hybrids for a highly efficient hydrogen evolution reaction

RSC Advances ◽  
2017 ◽  
Vol 7 (9) ◽  
pp. 5480-5487 ◽  
Author(s):  
Jung Eun Lee ◽  
Jaemin Jung ◽  
Taeg Yeoung Ko ◽  
Sujin Kim ◽  
Seong-Il Kim ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Electronic Transition ◽  
Catalytic Performance ◽  
Synergy Effect ◽  
Tafel Slope ◽  
Reduced Graphene ◽  
Catalytically Active

GO content tuning gradually enhanced the HER catalytic performance of the MoS2/rGO hybrids, decreasing the Tafel slope from 82 to 48 mV per decade owing to an increase of catalytically active areas and an electronic transition of MoS2.

scholarly journals The effect of surface modification by reduced graphene oxide on the electrocatalytic activity of nickel towards the hydrogen evolution reaction

2015 ◽  
Vol 17 (40) ◽  
pp. 26864-26874 ◽  
Author(s):  
Debabrata Chanda ◽  
Jaromír Hnát ◽  
Ana S. Dobrota ◽  
Igor A. Pašti ◽  
Martin Paidar ◽  
...  
Keyword(s):  
Surface Modification ◽  
Graphene Oxide ◽  
Dft Calculations ◽  
Reduced Graphene Oxide ◽  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Electrocatalytic Activity ◽  
Active Sites ◽  
Reduced Graphene ◽  
Effect Of Surface

The RGO-modified Ni electrode exhibited outstanding activity towards HER. DFT calculations indicate that H atoms, formed upon H2O discharge on Ni, spill onto the RGO, enabling continuous clearance of Ni-active sites.

CoP nanoparticles deposited on reduced graphene oxide sheets as an active electrocatalyst for the hydrogen evolution reaction

2015 ◽  
Vol 3 (10) ◽  
pp. 5337-5343 ◽  
Author(s):  
Lianbo Ma ◽  
Xiaoping Shen ◽  
Hu Zhou ◽  
Guoxing Zhu ◽  
Zhenyuan Ji ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Electrocatalytic Activity ◽  
Reduced Graphene ◽  
Graphene Oxide Sheets

A novel CoP/RGO composite with excellent electrocatalytic activity towards HER was prepared using a facile two-step strategy.

scholarly journals One-pot synthesis of MoS2(1−x)Se2x on N-doped reduced graphene oxide: tailoring chemical and structural properties for photoenhanced hydrogen evolution reaction

2020 ◽  
Vol 2 (10) ◽  
pp. 4830-4840
Author(s):  
Dario Mosconi ◽  
Tomasz Kosmala ◽  
Marco Lunardon ◽  
Alevtina Neyman ◽  
Maya Bar-Sadan ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Hydrogen Evolution ◽  
Structural Properties ◽  
Hydrogen Evolution Reaction ◽  
One Pot ◽  
Control Activity ◽  
One Pot Synthesis ◽  
Reduced Graphene

Molybdenum sulfoselenides are investigated as photoelectrocatalysts for the hydrogen evolution reaction. Crystallinity and selenium-to-sulphur ratio are key to control activity.

Solution-processed MoS2nanotubes/reduced graphene oxide nanocomposite as an active electrocatalyst toward the hydrogen evolution reaction

RSC Advances ◽  
2016 ◽  
Vol 6 (75) ◽  
pp. 70740-70746 ◽  
Author(s):  
Long Song ◽  
Mengjia Zhao ◽  
Xiaoxue Li ◽  
Zhipan Zhang ◽  
Liangti Qu
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Electrocatalytic Activity ◽  
Solution Processed ◽  
Good Electrocatalytic Activity ◽  
Reduced Graphene ◽  
Surfactant Assisted ◽  
3D Nanostructure

A hierarchical 3D nanostructure of MoS2nanotubes supported on a reduced graphene oxide network is prepared through a surfactant-assisted lyophilization process and it exhibits good electrocatalytic activity in the hydrogen evolution reaction.

scholarly journals Cysteine-Induced Hybridization of 2D Molybdenum Disulfide Films for Efficient and Stable Hydrogen Evolution Reaction

Materials ◽  
2021 ◽  
Vol 14 (5) ◽  
pp. 1165
Author(s):  
Arunas Jagminas ◽  
Paulius Gaigalas ◽  
Carla Bittencourt ◽  
Vaclovas Klimas
Keyword(s):  
Electron Microscopy ◽  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Photoelectron Spectroscopy ◽  
Hydrogen Adsorption ◽  
Hydrothermal Process ◽  
Linear Sweep Voltammetry ◽  
One Pot ◽  
Tafel Slope ◽  
Highly Active

The noble, metal-free materials capable of efficiently catalyzing water splitting reactions currently hold a great deal of promise. In this study, we reported the structure and electrochemical performance of new MoS2-based material synthesized with L-cysteine. For this, a facile one-pot hydrothermal process was developed and an array of densely packed nanoplatelet-shaped hybrid species directly on a conductive substrate were obtained. The crucial role of L-cysteine was determined by numerous methods on the structure and composition of the synthesized material and its activity and stability for hydrogen evolution reaction (HER) from the acidic water. A low Tafel slope of 32.6 mV dec−1, close to a Pt cathode, was registered for the first time. The unique HER performance at the surface of this hybrid material in comparison with recently reported MoS2-based electrocatalysts was attributed to the formation of more defective 1T, 2H-MoS2/MoOx, C nanostructures with the dominant 1T-MoS2 phase and thermally degraded cysteine residues entrapped. Numerous stacks of metallic (1T-MoS2 and MoO2) and semiconducting (2H-MoS2 and MoO3) fragments relayed the formation of highly active layered nanosheets possessing a low hydrogen adsorption free energy and much greater durability, whereas intercalated cysteine fragments had a low Tafel slope of the HER reaction. X-ray photoelectron spectroscopy, scanning electron microscopy, thermography with mass spectrometry, high-resolution transmission electron microscopy, Raman spectroscopy techniques, and linear sweep voltammetry were applied to verify our findings.

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