Silicon Nanowire-Ta2O5-NGQD Heterostructure: An Efficient Photocathode for Photoelectrochemical Hydrogen Evolution

2021 ◽  
Author(s):  
Sk. Riyajuddin ◽  
Jenifar Sultana ◽  
Shumile Ahmed Siddiqui ◽  
Sushil Kumar ◽  
Damini Badhwar ◽  
...  
Keyword(s):  
Solar Energy ◽  
Hydrogen Evolution ◽  
Water Splitting ◽  
Large Scale ◽  
Silicon Nanowire ◽  
Research Interest ◽  
Hydrogen Fuel ◽  
Environment Friendly ◽  
Pec Water Splitting

Photoelectrochemical (PEC) water splitting propels a broader research interest for large-scale and facile entrapment of solar energy in hydrogen fuel. It offers the most favorable and environment-friendly approach to harvest...

p-i-n Silicon Nanowire Array-NGQD: A Metal-Free Electrocatalyst for Photoelectrochemical Hydrogen Evolution

2021 ◽  
Author(s):  
Riyajuddin Sk ◽  
Sushil Kumar ◽  
Damini Badhwar ◽  
Shumile Ahmed Siddiqui ◽  
Jenifar Sultana ◽  
...  
Keyword(s):  
Hydrogen Evolution ◽  
Water Splitting ◽  
Silicon Nanowire ◽  
Nanowire Array ◽  
Fuel Conversion ◽  
Metal Free ◽  
Silicon Nanowire Array ◽  
Pec Water Splitting

Photoelectrochemical (PEC) water splitting is the most promising approach for the realization of efficient solar-to-fuel conversion. However, the biggest challenge is the development of efficient photoelectrodes with active, durable and...

Immobilized Covalent Triazine Frameworks Films as Effective Photocatalysts for Hydrogen Evolution Reaction

2021 ◽  
Author(s):  
Xunliang Hu ◽  
Irshad Hussain ◽  
Bien Tan
Keyword(s):  
Hydrogen Evolution ◽  
Water Splitting ◽  
Crystalline Structure ◽  
Large Scale ◽  
Interfacial Polymerization ◽  
Point Of View ◽  
Lateral Size ◽  
Free Standing ◽  
X Ray ◽  
Synthetic Approaches

Abstract Covalent triazine frameworks (CTFs) have recently been demonstrated as promising materials for photocatalytic water splitting and are usually used in the form of suspended powder. From a practical point of view, immobilized CTFs materials are more suitable for large-scale water splitting applications, owing to their convenient separation and recycling potential. However, existing synthetic approaches mainly result in insoluble and unprocessable powders, which makes their future device application still a huge challenge. Herein, we report an aliphatic amine-assisted interfacial polymerization method to obtain free-standing, crystalline CTFs film with excellent photoelectric performance. The lateral size of the film was up to 250 cm2, the average thickness can be regulated from 30-500 nm. The crystalline structure was confirmed by high-resolution transmission electron microscope (HR-TEM), powder X-ray diffraction (PXRD), and small-angle X-ray scattering (SAXS) analysis. Intrigued by the good light absorption, crystalline structure, and big lateral size of the film, it was immobilized on a glass support that exhibited good photocatalytic hydrogen evolution performance (5.4 mmol h-1 m-2) and was easy to recycle.

Fe-Co-P multi-heterostructure arrays for efficient electrocatalytic water splitting

2021 ◽  
Author(s):  
Hanwen Xu ◽  
Jiawei Zhu ◽  
Pengyan Wang ◽  
Ding Chen ◽  
Chengtian Zhang ◽  
...  
Keyword(s):  
Hydrogen Production ◽  
Hydrogen Evolution ◽  
Water Splitting ◽  
Oxygen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Oxygen Evolution Reaction ◽  
Rational Design ◽  
Large Scale ◽  
High Efficiency ◽  
Bifunctional Catalysts

Rational design and construction of high-efficiency bifunctional catalysts for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) is crucial for large-scale hydrogen production by water splitting. Herein, by a...

The dual-defective SnS2 monolayers: promising 2D photocatalysts for overall water splitting

2019 ◽  
Vol 21 (48) ◽  
pp. 26292-26300 ◽  
Author(s):  
Batjargal Sainbileg ◽  
Ying-Ren Lai ◽  
Li-Chyong Chen ◽  
Michitoshi Hayashi
Keyword(s):  
Solar Energy ◽  
Water Splitting ◽  
Hydrogen Fuel ◽  
Photocatalytic Water Splitting ◽  
Overall Water Splitting ◽  
Dual Defective

Photocatalytic water splitting on the dual-defective SnS2 monolayer is a promising way to produce hydrogen fuel from solar energy.

An artificial photosynthetic system with CO2-reducing solar-to-fuel efficiency exceeding 20%

2020 ◽  
Vol 8 (35) ◽  
pp. 18310-18317 ◽  
Author(s):  
Yanjun Xiao ◽  
Yao Qian ◽  
Anqi Chen ◽  
Tian Qin ◽  
Fan Zhang ◽  
...  
Keyword(s):  
Solar Energy ◽  
Hydrogen Evolution ◽  
Water Splitting ◽  
Fuel Efficiency ◽  
Photosynthetic System ◽  
Artificial Photosynthetic ◽  
Renewable Hydrogen

Artificial photosynthetic systems store solar energy in chemical fuels via CO2 reduction or renewable hydrogen evolution from water splitting.

scholarly journals TiO2 Nanosheet Arrays with Layered SnS2 and CoOx Nanoparticles for Efficient Photoelectrochemical Water Splitting

2019 ◽  
Vol 14 (1) ◽  
Author(s):  
Zhou Cao ◽  
Yanling Yin ◽  
Peng Fu ◽  
Dong Li ◽  
Yulan Zhou ◽  
...  
Keyword(s):  
Water Splitting ◽  
Water Oxidation ◽  
Environmental Issues ◽  
Charge Carriers ◽  
Oxidation Catalyst ◽  
Hydrogen Fuel ◽  
Nanosheet Array ◽  
Nanosheet Arrays ◽  
Global Energy Supply ◽  
Pec Water Splitting

Abstract Converting solar energy into sustainable hydrogen fuel by photoelectrochemical (PEC) water splitting is a promising technology to solve increasingly serious global energy supply and environmental issues. However, the PEC performance based on TiO2 nanomaterials is hindered by the limited sunlight-harvesting ability and its high recombination rate of photogenerated charge carriers. In this work, layered SnS2 absorbers and CoOx nanoparticles decorated two-dimensional (2D) TiO2 nanosheet array photoelectrode have been rationally designed and successfully synthesized, which remarkably enhanced the PEC performance for water splitting. As the result, photoconversion efficiency of TiO2/SnS2/CoOx and TiO2/SnS2 hybrid photoanodes increases by 3.6 and 2.0 times under simulated sunlight illumination, compared with the bare TiO2 nanosheet arrays photoanode. Furthermore, the TiO2/SnS2/CoOx photoanode also presented higher PEC stability owing to CoOx catalyst served as efficient water oxidation catalyst as well as an effective protectant for preventing absorber photocorrosion.

scholarly journals Nanocarbon-Enhanced 2D Photoelectrodes: A New Paradigm in Photoelectrochemical Water Splitting

2020 ◽  
Vol 13 (1) ◽  
Author(s):  
Jun Ke ◽  
Fan He ◽  
Hui Wu ◽  
Siliu Lyu ◽  
Jie Liu ◽  
...  
Keyword(s):  
Solar Energy ◽  
Water Splitting ◽  
Transition Metal Dichalcogenides ◽  
Future Research ◽  
New Paradigm ◽  
Co Catalysts ◽  
Challenges And Opportunities ◽  
Metal Dichalcogenides ◽  
Double Hydroxides ◽  
Pec Water Splitting

AbstractSolar-driven photoelectrochemical (PEC) water splitting systems are highly promising for converting solar energy into clean and sustainable chemical energy. In such PEC systems, an integrated photoelectrode incorporates a light harvester for absorbing solar energy, an interlayer for transporting photogenerated charge carriers, and a co-catalyst for triggering redox reactions. Thus, understanding the correlations between the intrinsic structural properties and functions of the photoelectrodes is crucial. Here we critically examine various 2D layered photoanodes/photocathodes, including graphitic carbon nitrides, transition metal dichalcogenides, layered double hydroxides, layered bismuth oxyhalide nanosheets, and MXenes, combined with advanced nanocarbons (carbon dots, carbon nanotubes, graphene, and graphdiyne) as co-catalysts to assemble integrated photoelectrodes for oxygen evolution/hydrogen evolution reactions. The fundamental principles of PEC water splitting and physicochemical properties of photoelectrodes and the associated catalytic reactions are analyzed. Elaborate strategies for the assembly of 2D photoelectrodes with nanocarbons to enhance the PEC performances are introduced. The mechanisms of interplay of 2D photoelectrodes and nanocarbon co-catalysts are further discussed. The challenges and opportunities in the field are identified to guide future research for maximizing the conversion efficiency of PEC water splitting.

scholarly journals Solar Energy Harvesting with Carbon Nitrides: Do We Understand the Mechanism?

2018 ◽  
Author(s):  
Wolfgang Domcke ◽  
Johannes Ehrmaier ◽  
Andrzej L. Sobolewski
Keyword(s):  
Excited State ◽  
Solar Energy ◽  
Water Molecule ◽  
Hydrogen Evolution ◽  
Water Splitting ◽  
Hydroxyl Radicals ◽  
Carbon Nitride ◽  
Carbon Nitrides ◽  
Polymeric Carbon ◽  
Carbon Nitride Materials

The photocatalytic splitting of water into molecular hydrogen and molecular oxygen with sunlight is the dream reaction for solar energy conversion. Since decades, transition-metal-oxide semiconductors and supramolecular organometallic structures have been extensively explored as photocatalysts for solar water splitting. More recently, polymeric carbon nitride materials consisting of triazine or heptazine building blocks have attracted considerable attention as hydrogen-evolution photocatalysts. The mechanism of hydrogen evolution with polymeric carbon nitrides is discussed throughout the current literature in terms of the familiar concepts developed for photoelectrochemical water splitting with semiconductors since the 1970s. We discuss in this perspective an alternative mechanistic paradigm for photoinduced water splitting with carbon nitrides, which focusses on the specific features of the photochemistry of aromatic N-heterocycles in aqueous environments. It is shown that a water molecule which is hydrogen-bonded to an N-heterocycle can be decomposed into hydrogen and hydroxyl radicals by two simple sequential photochemical reactions. This concept is illustrated by first-principles calculations of excited-state reaction paths and their energy profiles for hydrogen-bonded complexes of pyridine, triazine and heptazine with a water molecule. It is shown that the excited-state hydrogen-transfer and hydrogen-detachment reactions are essentially barrierless, in sharp contrast to water oxidation in the electronic ground state, where high barriers prevail. We also discuss in some detail the products of possible reactions of the highly reactive hydroxyl radicals with the chromophores. We hypothesize that the challenge of efficient solar hydrogen generation with carbon-nitride materials is less the decomposition of water as such, but rather the controlled recombination of the photogenerated radicals to the closed-shell products H2 and H2O2.

Interfacial engineering of Mo2C–Mo3C2 heteronanowires for high performance hydrogen evolution reactions

Nanoscale ◽  
2019 ◽  
Vol 11 (48) ◽  
pp. 23318-23329 ◽  
Author(s):  
Lina Jia ◽  
Chen Li ◽  
Yaru Zhao ◽  
Bitao Liu ◽  
Shixiu Cao ◽  
...  
Keyword(s):  
High Activity ◽  
Hydrogen Evolution ◽  
Water Splitting ◽  
Precious Metal ◽  
High Performance ◽  
Large Scale ◽  
Low Cost ◽  
Critical Importance ◽  
Interfacial Engineering ◽  
Hydrogen Evolution Reactions

Non-precious metal-based electrocatalysts with high activity and stability for efficient hydrogen evolution reactions are of critical importance for low-cost and large-scale water splitting.

Sign in / Sign up

Export Citation Format

Share Document