Efficiency and stability of narrow-gap semiconductor-based photoelectrodes

Zheng, Jianyun; Zhou, Huaijuan; Zou, Yuqin; Wang, Ruilun; Lyu, Yanhong; Jiang, San Ping; Wang, Shuangyin

doi:10.1039/c9ee00524b

Cited by 91 publications

(66 citation statements)

References 365 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Water splitting using renewable electrical energy as a promising environmental friendly technology provides a practical strategy for the future hydrogen‐based economy. [ 1–3 ] The design of efficient, stable, and cost‐effective electrocatalysts for water oxidation as core issue has received considerable attentions. [ 4 ] As potential alternative to noble metal electrocatalysts (like IrO 2 and RuO 2 ) [ 5 ] , cobalt (Co)‐based compounds have been extensively studied as effective and stable electrocatalysts for OER.…”

Section: Introductionmentioning

confidence: 99%

Identifying the Intrinsic Relationship between the Restructured Oxide Layer and Oxygen Evolution Reaction Performance on the Cobalt Pnictide Catalyst

Lyu

Zheng

Xiao

et al. 2020

Small

Self Cite

View full text Add to dashboard Cite

The ORCID identification number(s) for the author(s) of this article can be found under https://doi.org/10.1002/smll.201906867. Cobalt pnictides show good catalytic activity and stability on oxygen evolution reaction (OER) behaviors in a strong alkaline solution.Identifying the intrinsic composition/structure-property relationship of the oxide layer on the cobalt pnictides is critical to design better and cheaper electrocatalysts for the commercial viability of OER technologies. In this work, the restructured oxide layer on the cobalt pnictides and its effect on the activity and mechanism for OER is systematically analyzed. In-situ electrochemical impedance spectroscopy (EIS) and near edge x-ray absorption fine structure (NEXAFS) spectra indicate that a higher OER performance of cobalt pnictides than Co 3 O 4 is attributed to the more structural disorder and oxygen defect sites in the cobalt oxide layer evolved from cobalt pnictides. Using angle resolved x-ray photoelectron spectroscopy (AR-XPS) further demonstrates that the oxygen defect sites mainly concentrate on the subsurface of cobalt oxide layer. The current study demonstrated promising opportunities for further enhancing the OER performance of cobalt-based electrocatalysts by controlling the subsurface defects of the restructured active layer. www.advancedsciencenews.com

show abstract

Section: Introductionmentioning

confidence: 99%

Identifying the Intrinsic Relationship between the Restructured Oxide Layer and Oxygen Evolution Reaction Performance on the Cobalt Pnictide Catalyst

Lyu

Zheng

Xiao

et al. 2020

Small

Self Cite

View full text Add to dashboard Cite

show abstract

“…In order to improve the charge separation efficiency, various strategies have been suggested to date, such as nanofabrication of photoelectrodes, formation of heterojunction, defect engineering, and introduction of surface dipoles . In general, the migration of charge carriers in bulk electrodes and their recombination at the photoelectrode–electrolyte interface are considered two major factors determining the charge separation efficiency of the photoelectrodes . In particular, it was reported that the separation efficiency can be improved by controlling at least one dimension of photoelectrodes shorter than the diffusion length of the charge carriers or by introducing a heterojunction structure for band engineering .…”

Section: Introductionmentioning

confidence: 99%

Modulating Charge Separation Efficiency of Water Oxidation Photoanodes with Polyelectrolyte‐Assembled Interfacial Dipole Layers

Bae

Kim

et al. 2019

Adv Funct Materials

View full text Add to dashboard Cite

The charge separation efficiency of water oxidation photoanodes is modulated by depositing polyelectrolyte multilayers on their surface using layer‐by‐layer (LbL) assembly. The deposition of the polyelectrolyte multilayers of cationic poly(diallyldimethylammonium chloride) and anionic poly(styrene sulfonate) induces the formation of interfacial dipole layers on the surface of Fe2O3 and TiO2 photoanodes. The charge separation efficiency is modulated by tuning their magnitude and direction, which in turn can be achieved by controlling the number of bilayers and type of terminal polyelectrolytes, respectively. Specifically, the multilayers terminated with anionic poly(styrene sulfonate) exhibit a higher charge separation efficiency than those with cationic counterparts. Furthermore, the deposition of water oxidation molecular catalysts on top of interfacial dipole layers enables more efficient photoelectrochemical water oxidation. The approach exploiting the polyelectrolyte multilayers for improving the charge separation efficiency is effective regardless of pH and types of photoelectrodes. Considering the versatility of the LbL assembly, it is anticipated that this study will provide insights for the design and fabrication of efficient photoelectrodes.

show abstract

“…The pH is one of the most vital aspects in PEC water splitting. [13,21] Hence, care must be taken to understand the significant role by the pH of electrolyte. As evidenced by chronoamperogram (CA) curves 1 and 2 in Figure 3a, there is a rapid decrease in photocurrent density of ZnO nanorods to ≈10% within 30 min while this decline is reduced when the pH value changes from 6.8 to 10.5.…”

Section: Ph Effectmentioning

confidence: 99%

Recent Advancement of p‐ and d‐Block Elements, Single Atoms, and Graphene‐Based Photoelectrochemical Electrodes for Water Splitting

Tiwari

Singh

Sultan

et al. 2020

Advanced Energy Materials

View full text Add to dashboard Cite

is produced via steam reforming process, coal gasification, and water splitting methods. [4] Steam reforming and coal gasification generate hydrogen from the reaction of fossil fuels with water which requires high temperatures (≈1000 °C) and pressures. [4a] The steam reforming and coal gasification utilize the conventional fossil fuels for hydrogen fuel generation, therefore, emitting the flue gas (CO and CO 2 ) to the environment that is severely affecting the climate. In contrast, hydrogen fuel produced from water splitting reaction is a highly favored and clean alternative because of the following advantages: i) water splitting reactions proceed at room temperature and pressure which requires less infrastructure, ii) hydrogen and oxygen gases are produced separately, which thus eliminates the gas separation steps, and iii) both reactant (H 2 O) and products (H 2 and O 2 ) are environmentally friendly, which fulfills the concept of green technology. [5] Fundamentally, water splitting is a two half-cell reaction in which hydrogen is generated at cathode through hydrogen evolution reaction (HER) [6] while oxygen is generated at anode through oxygen evolution reaction (OER). [7] Splitting water for hydrogen generation can be mainly achieved via electrocatalytic and photocatalytic/photoelectrocatalytic systems. In electrochemical water splitting, the hydrogen and oxygen are produced through high thermodynamic potential and platinum-/iridium-based catalysts. [8] In electrochemical water splitting, the consumption of high electric power and the uneconomical catalysts hinder the industrial-scale hydrogen production. Therefore, most of the recent efforts for hydrogen generation through water splitting are directed toward sunlightto-hydrogen conversion, since the light from the sun can be regarded as a free energy resource. [1,2,9] In photoelectrochemical (PEC) system, the most prominent solar-to-hydrogen (STH) conversion process is a photoelectrocatalytic hydrogen generation by water splitting. [2,9] The main components of a typical PEC cell are i) a working electrode composed of a semiconducting material responsible for the current generation, ii) a counter electrode designed to complement the main catalytic process, and iii) an electrolyte system which provides efficient mass transport to the surface of each electrode. [9] Figure 1 summarizes the general photoelectrocatalytic

show abstract

Efficiency and stability of narrow-gap semiconductor-based photoelectrodes

Abstract: The efficiency and stability of narrow-gap semiconductor-based photoelectrodes are two fundamental factors for realizing their industrial solar-to-fuel conversion.

Cited by 91 publications

References 365 publications

Identifying the Intrinsic Relationship between the Restructured Oxide Layer and Oxygen Evolution Reaction Performance on the Cobalt Pnictide Catalyst

Identifying the Intrinsic Relationship between the Restructured Oxide Layer and Oxygen Evolution Reaction Performance on the Cobalt Pnictide Catalyst

Modulating Charge Separation Efficiency of Water Oxidation Photoanodes with Polyelectrolyte‐Assembled Interfacial Dipole Layers

Recent Advancement of p‐ and d‐Block Elements, Single Atoms, and Graphene‐Based Photoelectrochemical Electrodes for Water Splitting

Contact Info

Product

Resources

About