Boron-doped nitrogen-deficient carbon nitride-based Z-scheme heterostructures for photocatalytic overall water splitting

Nature Energy, Journal Year: 2021, Volume and Issue: 6(4), P. 388 - 397

Published: March 22, 2021

Language: Английский

---

Z‐Scheme Photocatalytic Systems for Solar Water Splitting

Advanced Science, Journal Year: 2020, Volume and Issue: 7(7)

Published: Feb. 13, 2020

As the world decides on next giant step for renewable energy revolution, scientists have begun to reinforce their headlong dives into exploitation of solar energy. Hitherto, numerous attempts are made imitate natural photosynthesis plants by converting chemical fuels which resembles "Z-scheme" process. A recreation this system is witnessed in artificial Z-scheme photocatalytic water splitting generate hydrogen (H2). This work outlines recent significant implication splitting, particularly role electron mediator and key factors that improve performance. The Review begins with fundamental rationales followed a survey development roadmap three different generations system: 1) PS-A/D-PS (first generation), 2) PS-C-PS (second 3) PS-PS (third generation). Focus also placed scaling up "leaf-to-tree" challenge system, known as photocatalyst sheet. detailed investigation achieving H2 evolution from past present accompanied in-depth discussion challenges area provided.

Language: Английский

---

Strong‐Base‐Assisted Synthesis of a Crystalline Covalent Triazine Framework with High Hydrophilicity via Benzylamine Monomer for Photocatalytic Water Splitting

Angewandte Chemie International Edition, Journal Year: 2020, Volume and Issue: 59(15), P. 6007 - 6014

Published: Jan. 13, 2020

Methods to synthesize crystalline covalent triazine frameworks (CTFs) are limited and little attention has been paid development of hydrophilic CTFs photocatalytic overall water splitting. A route CTF-HUST-A1 with a benzylamine-functionalized monomer is presented. The base reagent used plays an important role in the enhancement crystallinity hydrophilicity. exhibits good crystallinity, excellent hydrophilicity, activity sacrificial hydrogen evolution (hydrogen rate up 9200 μmol g-1 h-1 ). Photocatalytic splitting achieved by depositing dual co-catalysts CTF-HUST-A1, H2 O2 rates 25.4 12.9 pure without using agent.

Language: Английский

---

Construction of Interfacial Electric Field via Dual‐Porphyrin Heterostructure Boosting Photocatalytic Hydrogen Evolution

Advanced Materials, Journal Year: 2021, Volume and Issue: 34(3)

Published: Nov. 5, 2021

A dual-porphyrin heterostructure is successfully constructed by coupling tetrakis (4-carboxyphenyl) zinc porphyrin (ZnTCPP) with (4-hydroxyphenyl) (THPP). The high photocatalytic H2 evolution rate of 41.4 mmol h-1 g-1 obtained for ZnTCPP/THPP under full spectrum, which ≈5.1 and ≈17.0 times higher than that pure ZnTCPP THPP, respectively. significantly enhanced activity mainly attributed to the giant interfacial electric field formed between dual porphyrins, greatly facilitates efficient charge separation transfer. Meanwhile, similar conjugated structures porphyrins also provide proper interface match decrease defects, thus inhibiting recombination photoproduced carriers. By rationally combining appropriate band high-quality contact this work provides a fresh insight into construction improve performance.

Language: Английский

---

Construction of core-shell heterojunction regulating α-Fe2O3 layer on CeO2 nanotube arrays enables highly efficient Z-scheme photoelectrocatalysis

Applied Catalysis B Environment and Energy, Journal Year: 2020, Volume and Issue: 276, P. 119138 - 119138

Published: May 21, 2020

Language: Английский

---

Covalent Organic Frameworks Enabling Site Isolation of Viologen‐Derived Electron‐Transfer Mediators for Stable Photocatalytic Hydrogen Evolution

Angewandte Chemie International Edition, Journal Year: 2021, Volume and Issue: 60(17), P. 9642 - 9649

Published: Jan. 23, 2021

Abstract Electron transfer is the rate‐limiting step in photocatalytic water splitting. Viologen and its derivatives are able to act as electron‐transfer mediators (ETMs) facilitate rapid electron from photosensitizers active sites. Nevertheless, ability often suffers formation of a stable dipole structure through coupling between cationic‐radical‐containing viologen‐derived ETMs, by which process becomes restricted. Herein, cyclic diquats, kind ETM, integrated into 2,2′‐bipyridine‐based covalent organic framework (COF) post‐quaternization reaction. The content distribution embedded diquat‐ETMs elaborately controlled, leading favorable site‐isolated arrangement. resulting materials integrate photosensitizing units ETMs one system, exhibiting enhanced hydrogen evolution rate (34600 μmol h −1 g ) sustained performances when compared single‐module COF COF/ETM mixture. integration strategy applied 2D platform promotes consecutive photochemical processes multi‐component cooperation.

Language: Английский

---

A [001]‐Oriented Hittorf's Phosphorus Nanorods/Polymeric Carbon Nitride Heterostructure for Boosting Wide‐Spectrum‐Responsive Photocatalytic Hydrogen Evolution from Pure Water

Angewandte Chemie International Edition, Journal Year: 2019, Volume and Issue: 59(2), P. 868 - 873

Published: Oct. 30, 2019

Abstract Red phosphorus is a promising photocatalyst with wide visible‐light absorption up to 700 nm, but the fast charge recombination limits its photocatalytic hydrogen evolution reaction (HER) activity. Now, [001]‐oriented Hittorf's (HP) nanorods were successfully grown on polymeric carbon nitride (PCN) by chemical vapor deposition strategy. Compared bare PCN and HP, optimized PCN@HP hybrid exhibited significantly enhanced activity, HER rates reaching 33.2 17.5 μmol h −1 from pure water under simulated solar light visible irradiation, respectively. It was theoretically experimentally indicated that strong electronic coupling between HP gave rise greatly accelerated photoinduced electron–hole separation transfer, which benefited performance.

Language: Английский

---

Perylenetetracarboxylic acid nanosheets with internal electric fields and anisotropic charge migration for photocatalytic hydrogen evolution

Nature Communications, Journal Year: 2022, Volume and Issue: 13(1)

Published: April 19, 2022

Abstract Highly efficient hydrogen evolution reactions carried out via photocatalysis using solar light remain a formidable challenge. Herein, perylenetetracarboxylic acid nanosheets with monolayer thickness of ~1.5 nm were synthesized and shown to be active photocatalysts production rates 118.9 mmol g −1 h . The carboxyl groups increased the intensity internal electric fields from perylene center border by 10.3 times promote charge-carrier separation. photogenerated electrons holes migrated edge plane, respectively, weaken recombination. Moreover, reduction potential increases −0.47 V −1.13 due decreased molecular conjugation enhances ability. In addition, created hydrophilic sites. This work provides strategy engineer structures future photocatalysts.

Language: Английский

---

Considerations for a More Accurate Evaluation Method for Photocatalytic Water Splitting

Angewandte Chemie International Edition, Journal Year: 2020, Volume and Issue: 59(42), P. 18312 - 18320

Published: Sept. 9, 2020

Abstract Over the past decades, various photocatalysts have been developed and great progress has achieved in field of solar‐driven photocatalytic water splitting. However, lack an accurate comprehensive evaluation method greatly hinders meaningful comparison between different systems becomes a serious impediment for development photocatalysts. Although many researchers are aware this, there little work this area. In Viewpoint, we first analyze insufficiencies existing methods then make preliminary suggestions, aiming to stimulate discussion research community hopefully lead widely accepted authoritative system assess photocatalyst performance.

Language: Английский

---

Visually resolving the direct Z-scheme heterojunction in CdS@ZnIn2S4 hollow cubes for photocatalytic evolution of H2 and H2O2 from pure water

Applied Catalysis B Environment and Energy, Journal Year: 2021, Volume and Issue: 293, P. 120213 - 120213

Published: April 7, 2021

Language: Английский

---