Fluorine Doping Assisted Vacancy Engineering for Efficient Electrocatalyst towards Hydrogen Production

2021 ◽  
Author(s):  
Xinhong Chen ◽  
Mengjiao Wei ◽  
Jia Zhou
Keyword(s):  
Hydrogen Production ◽  
Rational Design ◽  
Energy Crisis ◽  
Fluorine Doping

The rational design of an efficient and stable electrocatalyst utilizing defects plays a key role in promoting hydrogen production from electrolytic water to tackle the energy crisis. In this work,...

FeS2-anchored transition metal single atoms for high-efficient overall water splitting: A DFT computational screening study

2021 ◽  
Author(s):  
Yingju Yang ◽  
Jing Liu ◽  
Feng Liu ◽  
Zhen Wang ◽  
Dawei Wu
Keyword(s):  
Hydrogen Production ◽  
Rational Design ◽  
Water Electrolysis ◽  
Energy Crisis ◽  
Human Society ◽  
Renewable Electricity ◽  
Single Atoms ◽  
Computational Screening ◽  
High Efficient ◽  
Screening Study

Hydrogen production from water electrolysis using the renewable electricity is widely regarded as a highly promising route to solve the energy crisis of human society. However, the rational design of...

scholarly journals Ag–Au Core–Shell Triangular Nanoprisms for Improving p-g-C3N4 Photocatalytic Hydrogen Production

Nanomaterials ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 3347
Author(s):  
Yali Guo ◽  
Anzhou Xu ◽  
Juan Hou ◽  
Qingcui Liu ◽  
Hailong Li ◽  
...  
Keyword(s):  
Hydrogen Production ◽  
Self Assembly ◽  
Rational Design ◽  
Photogenerated Electron ◽  
Core Shell ◽  
Co Catalyst ◽  
Replacement Method ◽  
Assembly Method ◽  
Free Replacement ◽  
Electron Holes

Ag–Au core–shell triangular nanoprisms (Ag@Au TNPs) have aroused extensive research interest in the field of hydrogen evolution reaction (HER) due to their strong plasmon effect and stability. Here, Ag@Au TNPs were fabricated by the galvanic-free replacement method. Then, we loaded them on protonated g-C3N4 nanoprisms (P–CN) by the electrostatic self-assembly method as an efficient plasmonic photocatalyst for HER. The hydrogen production rate of Ag@Au TNPs/P–CN (4.52 mmol/g/h) is 4.1 times higher than that of P–CN (1.11 mmol/g/h) under simulated sunlight irradiation, making it the most competitive material for water splitting. The formed Schottky junction helps to trap the hot electrons generated from Ag@Au TNPs, and the well-preserved tips of the Ag@Au TNPs can effectively generate an electromagnetic field to inhibit the photogenerated electron–holes pairs recombination. This study suggests that the rational design of Ag@Au TNPs by the galvanic-free replacement method is an effective co-catalyst for HER and boosting the additional combination of plasmonic metals and catalyst metals for the enhancement to HER.

A p-Si/NiCoSex core/shell nanopillar array photocathode for enhanced photoelectrochemical hydrogen production

2016 ◽  
Vol 9 (10) ◽  
pp. 3113-3119 ◽  
Author(s):  
Hongxiu Zhang ◽  
Qi Ding ◽  
Denghong He ◽  
Hu Liu ◽  
Wei Liu ◽  
...  
Keyword(s):  
Hydrogen Production ◽  
Rational Design ◽  
Hydrogen Generation ◽  
Core Shell ◽  
Photoelectrochemical Hydrogen Production

We report the rational design and successful preparation of p-Si/NiCoSex core/shell nanopillar array photocathodes for enhanced solar-driven photoelectrochemical hydrogen generation.

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...

Rational design of Ru(II)-phenanthroline complex embedded porous TiO2photocatalyst for efficient hydrogen production

2020 ◽  
Vol 159 ◽  
pp. 1-9
Author(s):  
Spandana Gonuguntla ◽  
Amritanjali Tiwari ◽  
Jonnalagadda Gopinath ◽  
Soujanya Yarasi ◽  
Annadanam V. Sesha Sainath ◽  
...  
Keyword(s):  
Hydrogen Production ◽  
Rational Design ◽  
Phenanthroline Complex

scholarly journals Covalent organic frameworks in Lieb lattice for tunable photocatalytic water splitting under visible light

2021 ◽  
Author(s):  
Hongde Yu ◽  
Dong Wang
Keyword(s):  
Hydrogen Production ◽  
Water Splitting ◽  
Active Sites ◽  
Rational Design ◽  
Near Infrared ◽  
Band Alignment ◽  
Covalent Organic Frameworks ◽  
Photocatalytic Water Splitting ◽  
Metal Free ◽  
Lieb Lattice

Covalent organic frameworks (COFs) with highly designable skeleton and inherent pores have emerged as promising organic photocatalysts for hydrogen production. However, inefficient solar light harvesting, strong excitonic effect, and the lack of active sites still pose major challenges to the rational design of COFs for efficient photocatalytic water splitting and the structure-property relationship has not been established. In this work, we investigated the fundamental mechanism of photoelectrochemical conversion in fully conjugated donor (D)-acceptor (A) COFs in Lieb lattice and proposed a facile strategy to achieve broad visible and near-infrared absorption, prompt exciton dissociation, tunable band alignment for overall water splitting, and metal-free catalysis of hydrogen production. Interestingly, we found that the exciton binding energy was substantially reduced with the narrowing of optical band gap and the increase of static dielectric constant. Further, we unraveled that the hydrogen bond played a vital role in suppressing the overpotential for hydrogen evolution reaction to enable metal-free catalysis. These findings not only highlight a novel route to modulating electronic properties of COFs towards high photocatalytic activity for water splitting, but also offer tremendous opportunities to design metal-free catalysts for other chemical transformations.

scholarly journals Metal-Free Heptazine-Based Porous Polymeric Network as Highly Efficient Catalyst for CO2 Capture and Conversion

2021 ◽  
Vol 9 ◽  
Author(s):  
Neha Sharma ◽  
Bharat Ugale ◽  
Sunil Kumar ◽  
Kamalakannan Kailasam
Keyword(s):  
Rational Design ◽  
Structural Integrity ◽  
Cycloaddition Reaction ◽  
Value Added ◽  
Cyclic Carbonate ◽  
Energy Crisis ◽  
Water Stability ◽  
High Chemical ◽  
Efficient Catalyst ◽  
Microporous Polymer

The capture and catalytic conversion of CO2 into value-added chemicals is a promising and sustainable approach to tackle the global warming and energy crisis. The nitrogen-rich porous organic polymers are excellent materials for CO2 capture and separation. Herein, we present a nitrogen-rich heptazine-based microporous polymer for the cycloaddition reaction of CO2 with epoxides in the absence of metals and solvents. HMP-TAPA, being rich in the nitrogen site, showed a high CO2 uptake of 106.7 mg/g with an IAST selectivity of 30.79 toward CO2 over N2. Furthermore, HMP-TAPA showed high chemical and water stability without loss of any structural integrity. Besides CO2 sorption, the catalytic activity of HMP-TAPA was checked for the cycloaddition of CO2 and terminal epoxides, resulting in cyclic carbonate with high conversion (98%). They showed remarkable recyclability up to 5 cycles without loss of activity. Overall, this study represents a rare demonstration of the rational design of POPs (HMP-TAPA) for multiple applications.

scholarly journals Graphitic Carbon Nitride Materials for Photocatalytic Hydrogen Production via Water Splitting: A Short Review

Catalysts ◽  
2019 ◽  
Vol 9 (10) ◽  
pp. 805 ◽  
Author(s):  
Seong Jun Mun ◽  
Soo-Jin Park
Keyword(s):  
Hydrogen Production ◽  
Water Splitting ◽  
Rational Design ◽  
Carbon Nitride ◽  
Clean Energy ◽  
Graphitic Carbon ◽  
Graphitic Carbon Nitride ◽  
Future Research ◽  
Metal Doping ◽  
Photocatalytic Hydrogen Production

The generation of photocatalytic hydrogen via water splitting under light irradiation is attracting much attention as an alternative to solve such problems as global warming and to increase interest in clean energy. However, due to the low efficiency and selectivity of photocatalytic hydrogen production under solar energy, a major challenge persists to improve the performance of photocatalytic hydrogen production through water splitting. In recent years, graphitic carbon nitride (g-C3N4), a non-metal photocatalyst, has emerged as an attractive material for photocatalytic hydrogen production. However, the fast recombination of photoexcited electron–hole pairs limits the rate of hydrogen evolution and various methods such as modification, heterojunctions with semiconductors, and metal and non-metal doping have been applied to solve this problem. In this review, we cover the rational design of g-C3N4-based photocatalysts achieved using methods such as modification, metal and non-metal doping, and heterojunctions, and we summarize recent achievements in their application as hydrogen production photocatalysts. In addition, future research and prospects of hydrogen-producing photocatalysts are also reviewed.

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