Exploring Advanced Oxygen Reduction Reaction Electrocatalysts: The Potential of Metal-Free and Non-Pyrolyzed Covalent Organic Frameworks
ChemSusChem. 2024 Apr 17:e202400558. doi: 10.1002/cssc.202400558. Online ahead of print.ABSTRACTOxygen reduction reaction (ORR) electrocatalysis is an area of increasing interest for the in-situ production of H2O2 or the development of energy-related devices such as hydrogen fuel cells. Although pyrolyzed catalysts still offer the best performances to date with reference to the organic-based catalysts, metal-free and non-pyrolyzed covalent organic frameworks (COFs) stands out as promising alternatives candidates due to their favourable characteristics such as crystallinity, porosity, and organic composition, allowing the s...
Source: ChemSusChem - April 17, 2024 Category: Chemistry Authors: Marcos Mart ínez-Fernández Jose L Segura Source Type: research
Implications of Defect Density and Polymer Interactions for CO2 Capture on Amine-Functionalized MIL-101(Cr)
ChemSusChem. 2024 Apr 16:e202400249. doi: 10.1002/cssc.202400249. Online ahead of print.ABSTRACTRising anthropogenic carbon emissions have dire environmental consequences, necessitating remediative approaches, which includes use of solid sorbents. Here, aminopolymers (poly(ethylenimine) (PEI) and poly(propylenimineimine) (PPI)) are supported within solid mesoporous MIL-101(Cr) to examine effects of support defect density on aminopolymer-MOF interactions for CO2 uptake and stability during uptake-regeneration cycles. Using simulated flue gas (10 % CO2 in He), MIL-101(Cr)-ρhigh (higher defect density) shows 33 % higher upta...
Source: ChemSusChem - April 17, 2024 Category: Chemistry Authors: Rachel A Yang Stanley Cho Sydney N Hughes Michele L Sarazen Source Type: research
Adaptability of Heteropolytungstate Anions as Efficient Anode Redox Mediators in Redox Flow Polymer Electrolyte Fuel Cells
In this study, heteropolytungstate anions with different heteroatoms were adapted as anodic redox mediators in a redox flow PEFC. In power generation tests, the redox flow PEFC with an anolyte of zinctungstate anion showed the highest performance. Zinctungstate anion exhibited the fastest reduction and oxidation rates among the W-HPAs investigated in this study.PMID:38628077 | DOI:10.1002/cssc.202301305 (Source: ChemSusChem)
Source: ChemSusChem - April 17, 2024 Category: Chemistry Authors: Shinji Naruse Hiroki Muroyama Toshiaki Matsui Koichi Eguchi Source Type: research
CO2 Valorization in Deep Eutectic Solvents
ChemSusChem. 2024 Apr 17:e202400197. doi: 10.1002/cssc.202400197. Online ahead of print.ABSTRACTThe deep eutectic solvent (DES) has emerged in recent years as a valuable medium for converting CO2 into valuable chemicals because of its easy availability, stability, and safety, and its capability to dissolve carbon dioxide. CO2 valorization in DES has evolved rapidly over the past 20 years. As well as being used as solvents for acid/base-promoted CO2 conversion for the production of cyclic carbonates and carbamates, DESs can be used as reaction media for electrochemical CO2 reduction for formic acid and CO. Among these produ...
Source: ChemSusChem - April 17, 2024 Category: Chemistry Authors: Zhenbo Guo Zhicheng Zhang Yuchen Huang Tianxing Lin Yixin Guo Liang-Nian He Tianfei Liu Source Type: research
Hierarchical Ni3V2O8@N-Doped Carbon Hollow Double-Shell Microspheres for High-Performance Lithium-Ion Storage
ChemSusChem. 2024 Apr 16:e202400091. doi: 10.1002/cssc.202400091. Online ahead of print.ABSTRACTTransition metal oxides (TMOs) are highly dense in energy and considered as promising anode materials for a new generation of alkaline ion batteries. However, their electrode structure is disrupted due to significant volume changes during charging and discharging, resulting in the short cycle life of batteries. In this paper, the hierarchical Ni3V2O8@N-doped carbon (Ni3V2O8@NC) hollow double-shell microspheres were prepared and used as electrode materials for lithium-ion batteries (LIBs). The utilization efficiency and ion trans...
Source: ChemSusChem - April 16, 2024 Category: Chemistry Authors: Yu Zhao Xiaobin Li Ning Li Dongqiang Zhang Haowen Ma Xuecheng Zhan Shiling Zhao Source Type: research
Towards the Use of Renewable Syngas for the Decarbonization of Industry
ChemSusChem. 2024 Apr 16:e202400059. doi: 10.1002/cssc.202400059. Online ahead of print.ABSTRACTIn this article we analyze how syngas produced in a renewable way can replace fossil-fuel based syngas production and thereby play an essential role in the decarbonization of industry. We show that in essentially all industrial applications renewable H2 and/or CO can replace syngas from fossil fuel feedstocks, and quantify the flows of these chemical building blocks required for the transformation of industry towards a net-zero emitting sector. We also undertake a techno-economic analysis, in which we demonstrate that under spec...
Source: ChemSusChem - April 16, 2024 Category: Chemistry Authors: Remko Detz Marit Beerse Nicole Meulendijks Pascal Buskens Bob van der Zwaan Source Type: research
Photo-switchable Collectors for the Flotation of Lithium Aluminate for the Recycling of the Critical Raw Material Lithium
ChemSusChem. 2024 Apr 16:e202301900. doi: 10.1002/cssc.202301900. Online ahead of print.ABSTRACTFlotation of the mineral lithium aluminate by application of the natural product punicine and some derivatives as collectors is examined. Punicines, 1-(2´,5´-dihydroxyphenyl)-pyridinium compounds, are switchable molecules whose properties can be changed reversibly. They exist as cations, neutral mesomeric betaines, anions, and dianions depending on the pH. In light, they form radicals. Five punicine derivatives were prepared which possess β-methyl, β-chlorine, γ-tert.-butyl, and γ-acetyl groups attached to the pyridinium r...
Source: ChemSusChem - April 16, 2024 Category: Chemistry Authors: Ali Zgheib Maximilian H Fischer Jan C Namyslo Ursula E A Fittschen Annett Wollmann Alfred P Weber Andreas Schmidt Source Type: research
Triflic Acid-Assisted Regioselective Bromination of Quinoxaline Derivatives Enables a Facile Synthesis of Polymer PTQ10
This study investigates triflic acid-assisted regioselective bromination of quinoxaline derivatives and proposes an alternative synthetic pathway for PTQ10. The developed route benefits from concise synthetic steps, a dependable procedure, and high overall yield. Starting with the condensation of 4,5-difluorobenzene-1,2-diamine with ethyl oxoacetate to yield 6,7-difluoroquinoxaline-2-ol, subsequent triflic acid-assisted regioselective bromination produces 5,8-dibromo-6,7-difluoroquinoxaline-2-ol in high yield. Alkylation under Mitsunobu reaction conditions yields 5,8-dibromo-6,7-difluoro-2-(2-hexyldecyloxy)quinoxaline, fol...
Source: ChemSusChem - April 16, 2024 Category: Chemistry Authors: Junmo Kang Shin Yeong Kim Hwan Hee Jo Kyukwan Zong Source Type: research
Pivotal Impact Factors in Photocatalytic Reduction of CO2 to Value-Added C1 and C2 Products
ChemSusChem. 2024 Apr 15:e202400551. doi: 10.1002/cssc.202400551. Online ahead of print.ABSTRACTOver the past decades, CO2 greenhouse emission has been considerably increased, causing global warming and climate change. Indeed, converting CO2 into valuable chemicals and fuels is a desired option to resolve issues caused by its continuous emission into the atmosphere. Nevertheless, CO2 conversion has been hampered by the ultrahigh dissociation energy of C=O bonds, which makes it thermodynamically and kinetically challenging. From this prospect, photocatalytic approaches appear promising for CO2 reduction in terms of their ef...
Source: ChemSusChem - April 15, 2024 Category: Chemistry Authors: Yongqian Cui Abdelkader Labidi Xinxin Liang Xin Huang Jingyi Wang Ximing Li Qibing Dong Xiaolong Zhang Sarah I Othman Ahmed A Allam Detlef W Bahnemann Chuanyi Wang Source Type: research
Continuous and Scalable Synthesis of Prussian Blue Analogues with Tunable Structure and Composition in Surfactant-Free Microreactor for Stable Zinc-Ion Storage
ChemSusChem. 2024 Apr 15:e202400552. doi: 10.1002/cssc.202400552. Online ahead of print.ABSTRACTWe represent a segmented flow surfactant-free microfluidic strategy for continuous synthesis of Prussian blue analogues (PBAs) with high dispersity and high crystallization. Representative zinc hexacyanoferrate (ZnHCF) nanocubes were successfully synthesized in a microfluidic reactor within a few minutes via the cooperation method and possessed lower contents of crystal water and Fe(CN)63- vacancies than that of synthesis in bulk solution. The nucleation and particle growth process can be precisely controlled by the exploration ...
Source: ChemSusChem - April 15, 2024 Category: Chemistry Authors: Mingli Wang Jingkang Ma Ke Lu Songtao Lu Hong Zhang Source Type: research
Modification of Visible-Light-Responsive Pb2Ti2O5.4F1.2 with Metal Oxide Cocatalysts to Improve Photocatalytic O2 Evolution toward Z-scheme Overall Water Splitting
ChemSusChem. 2024 Apr 15:e202400408. doi: 10.1002/cssc.202400408. Online ahead of print.ABSTRACTThe development of a highly active photocatalyst for visible-light water splitting requires a high-quality semiconductor material and a cocatalyst, which promote the migration of photogenerated charge carriers and surface redox reactions. In this work, cocatalyst loading on an oxyfluoride photocatalyst Pb2Ti2O5.4F1.2 was applied to improve the water oxidation activity. Among the metal oxides examined, RuO2 was found to be the most suitable, and the O2 evolution activity depended on the preparation conditions of Ru/Pb2Ti2O5.4F1.2...
Source: ChemSusChem - April 15, 2024 Category: Chemistry Authors: Yoshitaka Tamura Megumi Okazaki Hiroto Ueki Kenta Aihara Tomoki Kanazawa Dongxiao Fan Rie Haruki Akihide Iwase Shunsuke Nozawa Fumitaka Ishiwari Kunihisa Sugimoto Akinori Saeki Kazuhiko Maeda Source Type: research
Pivotal Impact Factors in Photocatalytic Reduction of CO2 to Value-Added C1 and C2 Products
ChemSusChem. 2024 Apr 15:e202400551. doi: 10.1002/cssc.202400551. Online ahead of print.ABSTRACTOver the past decades, CO2 greenhouse emission has been considerably increased, causing global warming and climate change. Indeed, converting CO2 into valuable chemicals and fuels is a desired option to resolve issues caused by its continuous emission into the atmosphere. Nevertheless, CO2 conversion has been hampered by the ultrahigh dissociation energy of C=O bonds, which makes it thermodynamically and kinetically challenging. From this prospect, photocatalytic approaches appear promising for CO2 reduction in terms of their ef...
Source: ChemSusChem - April 15, 2024 Category: Chemistry Authors: Yongqian Cui Abdelkader Labidi Xinxin Liang Xin Huang Jingyi Wang Ximing Li Qibing Dong Xiaolong Zhang Sarah I Othman Ahmed A Allam Detlef W Bahnemann Chuanyi Wang Source Type: research
Heterointerface-Rich Ni3N/WO3 Hierarchical Nanoarrays for Efficient Glycerol Oxidation-Assisted Alkaline Hydrogen Evolution
ChemSusChem. 2024 Apr 14:e202400624. doi: 10.1002/cssc.202400624. Online ahead of print.ABSTRACTGlycerol oxidation-assisted water electrolysis has emerged as a cost-effective way of co-producing green hydrogen and HCOOH. Still, preparing highly selective and stable nickel-based metal electrocatalysts remains a challenge. Herein, heterostructure Ni3N/WO3 nanosheet arrays of bifunctional catalysts with large specific surface areas loaded on nickel foam (denoted as Ni3N/WO3/NF) were synthesized. This catalyst was for glycerol oxidation reaction (GOR) and hydrogen evolution reaction (HER) with excellent catalytic performance, ...
Source: ChemSusChem - April 14, 2024 Category: Chemistry Authors: Hongjing Wang Wenjie Zhan Shaojian Jiang Kai Deng Ziqiang Wang You Xu Hongjie Yu Liang Wang Source Type: research
Synthetic Chemistry in Flow: From Photolysis & amp; Homogeneous Photocatalysis to Heterogeneous Photocatalysis
ChemSusChem. 2024 Apr 12:e202400064. doi: 10.1002/cssc.202400064. Online ahead of print.ABSTRACTPhotocatalytic synthesis of value-added chemicals has gained increasing attention in recent years owing to its versatility in driving many important reactions under ambient conditions. Selective hydrogenation, oxidation, coupling, and halogenation with a high conversion of the reactants have been realized using designed photocatalysts in batch reactors with small volumes at a laboratory scale; however, scaling-up remains a critical challenge due to inefficient utilization of incident light and active sites of the photocatalysts,...
Source: ChemSusChem - April 12, 2024 Category: Chemistry Authors: Sitong Feng Ren Su Source Type: research
Hydrogenolysis of Poly(Ethylene-co-Vinyl Alcohol) and Related Polymer Blends over Ruthenium Heterogeneous Catalysts
We report that Ru/ZrO2 is active for the concurrent hydrogenolysis, hydrogenation, and hydrodeoxygenation of EVOH and its thermal degradation products into alkanes (C1-C35) and water. Detailed reaction data, product analysis, and catalyst characterization reveal that the in-situ thermal degradation of EVOH forms aromatic intermediates that are detrimental to catalytic activity. Increased hydrogen pressure promotes hydrogenation of these aromatics, preventing catalyst deactivation and improving alkane product yields. Calculated apparent rates of C-C scission reveal that the hydrogenolysis of EVOH is slower than low-density ...
Source: ChemSusChem - April 12, 2024 Category: Chemistry Authors: Christine M Oberhausen Jignesh S Mahajan Jessie A Sun Thomas H Epps LaShanda T J Korley Dionisios G Vlachos Source Type: research
