• Latest
  • Trending
  • All
Constructing charge transfer channels on a photoanode surface by electrochemical treatment

Constructing charge transfer channels on a photoanode surface by electrochemical treatment

October 29, 2022
Oracle Analytics Cloud Backup: Keep Your Data Safe and Secure

Oracle Analytics Cloud Backup: Keep Your Data Safe and Secure

January 7, 2023
Veeam Backup Cloud Server - The Best for Enterprises

Veeam Backup Cloud Server – The Best for Enterprises

December 31, 2022
Domo marketing analytics

The Domo Marketing Analytics Review: The Most Comprehensive and Powerful Tool Available for Email Marketing

December 30, 2022
What is iCloud Backup? and How to Backup iCloud Fast and Simple

What is iCloud Backup? and How to Backup iCloud Fast and Simple

December 13, 2022
advantages of marketing analytics

The Fantastic Advantages Of Marketing Analytics

December 9, 2022
About Cloud Server and How to Backup Cloud Server 

About Cloud Server and How to Backup Cloud Server 

December 6, 2022
Big Data or Cloud Computing

Big Data or Cloud Computing: Which is Better?

December 6, 2022
Astronomers find cosmic rays driving galaxy’s winds

Astronomers find cosmic rays driving galaxy’s winds

December 5, 2022
Superaerophobic polyethyleneimine hydrogels improve electrochemical hydrogen production by promoting bubble detachment

Superaerophobic polyethyleneimine hydrogels improve electrochemical hydrogen production by promoting bubble detachment

December 4, 2022
Synthetic energy metabolism enables twin engine for cell

Synthetic energy metabolism enables twin engine for cell

December 4, 2022
Target names chief digital, product officer

Target names chief digital, product officer

December 3, 2022
Kohl’s joins early holiday promos trend with October deals

Kohl’s joins early holiday promos trend with October deals

December 3, 2022
Wednesday, February 1, 2023
  • Login
Infodoc.info
  • Home
  • Astronomy & Space
  • Biology
  • Chemistry
  • DTC
  • Marketing
  • Technology
  • Stories
    • Guides
    • How Tos
    • Apple
No Result
View All Result
  • Home
  • Astronomy & Space
  • Biology
  • Chemistry
  • DTC
  • Marketing
  • Technology
  • Stories
    • Guides
    • How Tos
    • Apple
No Result
View All Result
Infodoc.info
No Result
View All Result

Constructing charge transfer channels on a photoanode surface by electrochemical treatment

by Megusta
October 29, 2022
in Chemistry
0
Constructing charge transfer channels on a photoanode surface by electrochemical treatment

Constructing charge transfer channels on photoanode surface by electrochemical treatment
Electrochemical cyclic voltammetry treatment initiates the formation of HyMoOx surface defects, which act as charge transfer channels for photogenerated holes. Via these charge transfer channels, the charge separation and photoelectrochemical performance of Mo-doped BiVO4 electrode are significantly enhanced. Credit: Chinese Journal of Catalysis (2022). DOI: 10.1016/S1872-2067(21)63986-4

Photoelectrochemical (PEC) water splitting presents a promising way to convert solar energy into storable and transportable hydrogen energy. Among investigated semiconducting materials, BiVO4 is considered as an intriguing photoanode candidate, due to its low theoretical onset potential and relatively high photocurrent. Regarding its poor electronic conductivity, Mo doping is demonstrated as an effective strategy for enhancing carrier concentration and n-type conductivity.

However, MoOx is found to segregate at the surface of Mo-doped BiVO4 photoanodes, which serves as recombination centers and degrades the PEC performance. A previous study has proposed an electrochemical treatment to etch these surface MoOx segregations, thus realizing the activation of Mo-doped BiVO4 electrodes.

Yet it is difficult to explain the phenomenon that electrochemically activated Mo-doped BiVO4 electrodes gradually loss their activity when exposed to air at room temperature, because MoOx segregations cannot re-form under this condition. The underlying mechanism for electrochemical activation of Mo-doped BiVO4 needs further clarification.

Recently, a research team led by Prof. Zhaosheng Li from Nanjing University, China offered a new insight into the electrochemical activation of Mo-doped BiVO4 photoanodes: electrochemical treatment not only removes partial MoOx segregations, but also initiates the formation of HyMoOx surface defects which provide charge transfer channels for photogenerated holes. The results were published in Chinese Journal of Catalysis.

Using XPS, Raman and XRD measurements, it is revealed that simultaneous reduction and proton insertion in the MoOx species occur during electrochemical treatment via a faradaic reaction: MoOx + yH+ + ye– = HyMoOx. The formed HyMoOx surface defects are sensitive to oxidative environment under which they would be slowly transformed back to MoOx via a deprotonation process: HyMoOx + (y/4)O2 = MoOx + (y/2)H2O.

See also  Team develops new method to determine flaws in rubber
Powered by Inline Related Posts

Electrochemical oxidation of one-electron, highly reversible redox couple ferricyanide/ferrocyanide, [FeIII(CN)6]3–/[FeII(CN)6]4–, confirms that MoOx species blocks holes while HyMoOx surface defects act as efficient hole-transfer channels. The energy-diagram change of Mo-doped BiVO4, MoOx and electrolyte system before and after electrochemical treatment suggests that HyMoOx surface defects introduce defect energy levels thereby allow photogenerated holes to transport through.

Based on these experimental results, an explanation to photoactivity variation of electrochemically treated Mo-doped BiVO4 exposing to air is proposed. Upon electrochemical treatment, freshly formed HyMoOx surface defects behave as efficient hole transfer channels thereby increase the photocurrent greatly.

When exposing to air, these HyMoOx surface defects would be oxidized and transformed into MoOx, the photoactivity decline depends greatly on environmental temperature and exposure time. Once sufficient oxidation of HyMoOx defects completes, hole-blocking MoOx will dominate at Mo-doped BiVO4 surface and largely suppress the photoactivity.

The introduced concept of surface charge transfer channel is well worth further understanding and optimization, which would offer new opportunities for future development of various fields including energy storage, sensor, and surface/interface science.

Megusta

Megusta

No Result
View All Result

Categories

  • Apple
  • Astronomy & Space
  • Biology
  • Chemistry
  • DTC
  • Guides
  • How Tos
  • Marketing
  • Technology
  • Uncategorized
Infodoc.info

Copyright © 2022 Infodoc.info. All right reserved.

Navigate Site

  • About Us
  • Contact
  • Disclaimers
  • Privacy Policy
  • Terms and Conditons

Follow Us

No Result
View All Result
  • Home
  • Astronomy & Space
  • Biology
  • Chemistry
  • DTC
  • Marketing
  • Technology
  • Stories
    • Guides
    • How Tos
    • Apple

Copyright © 2022 Infodoc.info. All right reserved.

Welcome Back!

Login to your account below

Forgotten Password?

Retrieve your password

Please enter your username or email address to reset your password.

Log In