Charge Transfer Kinetics of Photo-Electrochemical Hydrogen Evolution Improved by Nonstoichiometric Ni-rich NiO x -Coated Si Photocathode in Alkaline Electrolyte

2017 ◽  
Vol 2 (2) ◽  
pp. 1700138 ◽  
Author(s):  
Jin-Young Jung ◽  
Jin-Young Yu ◽  
Sanghwa Yoon ◽  
Bongyoung Yoo ◽  
Jung-Ho Lee
Keyword(s):  
Charge Transfer ◽  
Hydrogen Evolution ◽  
Alkaline Electrolyte ◽  
Kinetics Of

scholarly journals Hydrogen evolution activity tuning via two-dimensional electron accumulation at buried interfaces

2019 ◽  
Vol 7 (36) ◽  
pp. 20696-20705 ◽  
Author(s):  
Yudong Xue ◽  
Zachary S. Fishman ◽  
Yunting Wang ◽  
Zhenhua Pan ◽  
Xin Shen ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Hydrogen Evolution ◽  
General Strategy ◽  
Two Dimensional ◽  
Dimensional Electron ◽  
Buried Interfaces ◽  
Electron Accumulation ◽  
System P ◽  
Bimetallic Sulfide ◽  
Kinetics Of

The buried electrocatalytic interfaces between bimetallic sulfide nanosheets and ALD TiO2 coatings achieved remarkable HER activity improvement, offering a general strategy for improving the charge-transfer kinetics of an electrocatalytic system.

scholarly journals Kinetics of Hydrogen Evolution on Copper Electrode Involving Organic Acids as Proton Donors

2011 ◽  
Vol 2011 ◽  
pp. 1-9 ◽  
Author(s):  
A. Survila ◽  
S. Kanapeckaitė ◽  
J. Pileckienė ◽  
J. Būdienė
Keyword(s):  
Charge Transfer ◽  
Hydrogen Evolution ◽  
Total Concentration ◽  
Surface Concentration ◽  
Sweep Rate ◽  
Copper Electrode ◽  
Linear Potential ◽  
Potential Sweep ◽  
Proton Donors ◽  
Kinetics Of

Linear potential sweep (LPS) voltammetry was applied to study the kinetics of hydrogen evolution in solutions containing glycolic, malic, tartaric, and gluconic acids. The CE mechanism of hydrogen evolution was analyzed invoking the 2nd Fick's law equations supplemented by terms that account for chemical interactions between diffusing particles. Acids are considered as components that are capable of releasing hydrated protons taking part in the charge-transfer step. Current peaks observed on LPS voltammograms are in linear dependence onν(νis the potential sweep rate). They obey well-known relationships obtained for simple redox processes, provided that the concentration of oxidant is treated as total concentration of proton donors. Determination of surface concentrations as current density functions makes it possible to transform LPS voltammograms into linear Tafel plots normalized with respect to the surface concentration of hydronium ions. Similar kinetic parameters (α≈0.6andi0≈10 μA cm−2) obtained at pH 3 for all OA solutions indicate that the nature of OA has no noticeable influence on the charge-transfer process.

scholarly journals Interfacial chemical bond and internal electric field modulated Z-scheme Sv-ZnIn2S4/MoSe2 photocatalyst for efficient hydrogen evolution

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Xuehua Wang ◽  
Xianghu Wang ◽  
Jianfeng Huang ◽  
Shaoxiang Li ◽  
Alan Meng ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Electric Field ◽  
Hydrogen Evolution ◽  
Density Functional ◽  
Monochromatic Light ◽  
Density Functional Theory Calculations ◽  
Internal Electric Field ◽  
Apparent Quantum Yield ◽  
Paramagnetic Resonance ◽  
High Hydrogen

AbstractConstruction of Z-scheme heterostructure is of great significance for realizing efficient photocatalytic water splitting. However, the conscious modulation of Z-scheme charge transfer is still a great challenge. Herein, interfacial Mo-S bond and internal electric field modulated Z-scheme heterostructure composed by sulfur vacancies-rich ZnIn2S4 and MoSe2 was rationally fabricated for efficient photocatalytic hydrogen evolution. Systematic investigations reveal that Mo-S bond and internal electric field induce the Z-scheme charge transfer mechanism as confirmed by the surface photovoltage spectra, DMPO spin-trapping electron paramagnetic resonance spectra and density functional theory calculations. Under the intense synergy among the Mo-S bond, internal electric field and S-vacancies, the optimized photocatalyst exhibits high hydrogen evolution rate of 63.21 mmol∙g−1·h−1 with an apparent quantum yield of 76.48% at 420 nm monochromatic light, which is about 18.8-fold of the pristine ZIS. This work affords a useful inspiration on consciously modulating Z-scheme charge transfer by atomic-level interface control and internal electric field to signally promote the photocatalytic performance.

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