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Liu J, Guðmundsson A, Bäckvall J. Efficient Aerobic Oxidation of Organic Molecules by Multistep Electron Transfer. Angew Chem Int Ed Engl 2021; 60:15686-15704. [PMID: 33368909 PMCID: PMC9545650 DOI: 10.1002/anie.202012707] [Citation(s) in RCA: 34] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2020] [Indexed: 12/17/2022]
Abstract
This Minireview presents recent important homogenous aerobic oxidative reactions which are assisted by electron transfer mediators (ETMs). Compared with direct oxidation by molecular oxygen (O2 ), the use of a coupled catalyst system with ETMs leads to a lower overall energy barrier via stepwise electron transfer. This cooperative catalytic process significantly facilitates the transport of electrons from the reduced form of the substrate-selective redox catalyst (SSRCred ) to O2 , thereby increasing the efficiency of the aerobic oxidation. In this Minireview, we have summarized the advances accomplished in recent years in transition-metal-catalyzed as well as metal-free aerobic oxidations of organic molecules in the presence of ETMs. In addition, the recent progress of photochemical and electrochemical oxidative functionalization using ETMs and O2 as the terminal oxidant is also highlighted. Furthermore, the mechanisms of these transformations are showcased.
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Affiliation(s)
- Jie Liu
- State Key Laboratory of Chemo/Biosensing and ChemometricsCollege of Chemistry and Chemical EngineeringHunan University410082ChangshaChina
- Department of Organic ChemistryArrhenius LaboratoryStockholm UniversitySE-10691StockholmSweden
| | - Arnar Guðmundsson
- Department of Organic ChemistryArrhenius LaboratoryStockholm UniversitySE-10691StockholmSweden
| | - Jan‐E. Bäckvall
- Department of Organic ChemistryArrhenius LaboratoryStockholm UniversitySE-10691StockholmSweden
- Department of Natural SciencesMid Sweden UniversityHolmgatan 10SE-85170SundsvallSweden
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52
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González J, Sequí J. Analysis of the Electrochemical Response of Surface‐confined Bidirectional Molecular Electrocatalysts in the Presence of Intermolecular Interactions. ChemCatChem 2021. [DOI: 10.1002/cctc.202001599] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Joaquín González
- Departamento de Química Física Facultad de Química Regional Campus of International Excellence “Campus Mare Nostrum” Universidad de Murcia 30100 Murcia Spain
| | - José‐Alfonso Sequí
- Departamento de Química Física Facultad de Química Regional Campus of International Excellence “Campus Mare Nostrum” Universidad de Murcia 30100 Murcia Spain
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53
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Antolini E. Lignocellulose, Cellulose and Lignin as Renewable Alternative Fuels for Direct Biomass Fuel Cells. CHEMSUSCHEM 2021; 14:189-207. [PMID: 32991061 DOI: 10.1002/cssc.202001807] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/28/2020] [Revised: 09/27/2020] [Indexed: 06/11/2023]
Abstract
In recent years the use of renewable sources, such as lignocellulosic biomass (LCB), as the fuel for various types of fuel cells received growing interest. Different types of fuel cells, that is, operated at low temperatures (T<100 °C; microbial fuel cells (MFC), alkaline (AFCs) and flow fuel cells (FFCs)), intermediate temperatures (T in the range 150-300 °C, proton-conducting inorganic-organic composite membrane fuel cells), and high temperatures (T≥500 °C, direct carbon fuel cells (DCFCs)), have been used for the conversion of the chemical energy in LCB to electrical energy. The economic advantage of the direct use of LCB consists of avoiding the acid hydrolysis of cellulose to glucose for low-temperature fuel cells and the pretreatment at high temperatures necessary to convert biomass to biochar (pyrolysis) in the case of high-temperature fuel cells. In this Review, the characteristics of direct biomass fuel cells are presented and their performance is compared with that of indirect biomass fuel cells fed with glucose (low-temperature fuel cells) and biochar (high-temperature fuel cells).
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Affiliation(s)
- Ermete Antolini
- Scuola di Scienza dei Materiali, Via 25 aprile 22, Cogoleto, 16016, Genova, Italy
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54
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Zheng J, Wang CG, Zhou H, Ye E, Xu J, Li Z, Loh XJ. Current Research Trends and Perspectives on Solid-State Nanomaterials in Hydrogen Storage. RESEARCH (WASHINGTON, D.C.) 2021; 2021:3750689. [PMID: 33623916 PMCID: PMC7877397 DOI: 10.34133/2021/3750689] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/05/2020] [Accepted: 12/02/2020] [Indexed: 11/26/2022]
Abstract
Hydrogen energy, with environment amicable, renewable, efficiency, and cost-effective advantages, is the future mainstream substitution of fossil-based fuel. However, the extremely low volumetric density gives rise to the main challenge in hydrogen storage, and therefore, exploring effective storage techniques is key hurdles that need to be crossed to accomplish the sustainable hydrogen economy. Hydrogen physically or chemically stored into nanomaterials in the solid-state is a desirable prospect for effective large-scale hydrogen storage, which has exhibited great potentials for applications in both reversible onboard storage and regenerable off-board storage applications. Its attractive points include safe, compact, light, reversibility, and efficiently produce sufficient pure hydrogen fuel under the mild condition. This review comprehensively gathers the state-of-art solid-state hydrogen storage technologies using nanostructured materials, involving nanoporous carbon materials, metal-organic frameworks, covalent organic frameworks, porous aromatic frameworks, nanoporous organic polymers, and nanoscale hydrides. It describes significant advances achieved so far, and main barriers need to be surmounted to approach practical applications, as well as offers a perspective for sustainable energy research.
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Affiliation(s)
- Jie Zheng
- Institute of Materials Research and Engineering, ASTAR (Agency for Science Technology and Research), 2 Fusionopolis Way, Innovis, #08-03, Singapore, Singapore 138634
| | - Chen-Gang Wang
- Institute of Materials Research and Engineering, ASTAR (Agency for Science Technology and Research), 2 Fusionopolis Way, Innovis, #08-03, Singapore, Singapore 138634
| | - Hui Zhou
- Institute of Materials Research and Engineering, ASTAR (Agency for Science Technology and Research), 2 Fusionopolis Way, Innovis, #08-03, Singapore, Singapore 138634
| | - Enyi Ye
- Institute of Materials Research and Engineering, ASTAR (Agency for Science Technology and Research), 2 Fusionopolis Way, Innovis, #08-03, Singapore, Singapore 138634
| | - Jianwei Xu
- Institute of Materials Research and Engineering, ASTAR (Agency for Science Technology and Research), 2 Fusionopolis Way, Innovis, #08-03, Singapore, Singapore 138634
| | - Zibiao Li
- Institute of Materials Research and Engineering, ASTAR (Agency for Science Technology and Research), 2 Fusionopolis Way, Innovis, #08-03, Singapore, Singapore 138634
| | - Xian Jun Loh
- Institute of Materials Research and Engineering, ASTAR (Agency for Science Technology and Research), 2 Fusionopolis Way, Innovis, #08-03, Singapore, Singapore 138634
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55
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Aerobic asymmetric oxygenation catalysis: a well forgotten… future? MENDELEEV COMMUNICATIONS 2021. [DOI: 10.1016/j.mencom.2021.01.002] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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56
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Galvin CM, Waymouth RM. Electron-Rich Phenoxyl Mediators Improve Thermodynamic Performance of Electrocatalytic Alcohol Oxidation with an Iridium Pincer Complex. J Am Chem Soc 2020; 142:19368-19378. [DOI: 10.1021/jacs.0c09605] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Affiliation(s)
- Conor M. Galvin
- Department of Chemistry, Stanford University, Stanford, California 94305, United States
| | - Robert M. Waymouth
- Department of Chemistry, Stanford University, Stanford, California 94305, United States
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57
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Weber RS, Ramasamy KK. Electrochemical Oxidation of Lignin and Waste Plastic. ACS OMEGA 2020; 5:27735-27740. [PMID: 33163755 PMCID: PMC7643066 DOI: 10.1021/acsomega.0c03989] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/18/2020] [Accepted: 10/12/2020] [Indexed: 06/11/2023]
Abstract
Both lignin and waste plastic are refractory polymers whose oxidation can produce feedstocks for the manufacture of chemicals and fuels. This brief review explores how renewably generated electricity could provide energy needed to selectively activate the endothermic depolymerization reactions, which might assist the production of hydrogen. We identify mediated electrochemistry as a particularly suitable approach to contending with these refractory, sparingly soluble materials.
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Affiliation(s)
- Robert S. Weber
- Institute for Integrated
Catalysis, Pacific Northwest National Laboratory, P.O. Box 999 MS-IN K1-83, Richland, Washington 99352, United States
| | - Karthikeyan K. Ramasamy
- Institute for Integrated
Catalysis, Pacific Northwest National Laboratory, P.O. Box 999 MS-IN K1-83, Richland, Washington 99352, United States
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58
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Dunn PL, Cook BJ, Johnson SI, Appel AM, Bullock RM. Oxidation of Ammonia with Molecular Complexes. J Am Chem Soc 2020; 142:17845-17858. [PMID: 32977718 DOI: 10.1021/jacs.0c08269] [Citation(s) in RCA: 41] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Oxidation of ammonia by molecular complexes is a burgeoning area of research, with critical scientific challenges that must be addressed. A fundamental understanding of individual reaction steps is needed, particularly for cleavage of N-H bonds and formation of N-N bonds. This Perspective evaluates the challenges of designing molecular catalysts for oxidation of ammonia and highlights recent key contributions to realizing the goals of viable energy storage and retrieval based on the N-H bonds of ammonia in a carbon-free energy cycle.
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Affiliation(s)
- Peter L Dunn
- Center for Molecular Electrocatalysis, Pacific Northwest National Laboratory, Richland, Washington 99352, United States
| | - Brian J Cook
- Center for Molecular Electrocatalysis, Pacific Northwest National Laboratory, Richland, Washington 99352, United States
| | - Samantha I Johnson
- Center for Molecular Electrocatalysis, Pacific Northwest National Laboratory, Richland, Washington 99352, United States
| | - Aaron M Appel
- Center for Molecular Electrocatalysis, Pacific Northwest National Laboratory, Richland, Washington 99352, United States
| | - R Morris Bullock
- Center for Molecular Electrocatalysis, Pacific Northwest National Laboratory, Richland, Washington 99352, United States
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59
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Diao Y, Liu H, Yao Z, Liu Y, Hu G, Zhang Q, Li Z. Tri-(Fe/F/N)-doped porous carbons as electrocatalysts for the oxygen reduction reaction in both alkaline and acidic media. NANOSCALE 2020; 12:18826-18833. [PMID: 32970058 DOI: 10.1039/d0nr04920d] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Developing a low cost, sustainable and high-performance precious-metal free catalyst to replace platinum (Pt)-based catalysts for the oxygen reduction reaction (ORR) in fuel cells has recently attracted significant attention. It is crucial to produce more abundant and more uniformly dispersed ORR active sites for improving the ORR performance of the catalyst. Herein, we synthesized tri-(Fe/F/N)-doped porous carbons as high-efficiency electrocatalysts for the ORR by using Fe-zeolitic imidazolate framework-8 (Fe-ZIF-8) and ammonium fluoride as precursors. The results indicate that the as-prepared FeFNC-5 catalysts exhibit superior ORR activity, methanol tolerance, and long-term stability compared to commercial 20 wt% Pt/C in both alkaline and acidic media because of the abundant and dispersed Fe-Nx and pyridinic-N active sites, high specific surface area, and hierarchical porous structure. This work provides a new method and insights into the synthesis of Fe, F, and N triple-doped porous carbons as high-efficiency ORR electrocatalysts.
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Affiliation(s)
- Yongxing Diao
- State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, Jilin 130022, China.
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60
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Abstract
The renewed interest in electrosynthesis demonstrated by organic chemists in the last years has allowed for rapid development of new methodologies. In this review, advances in enantioselective electrosynthesis that rely on catalytic amounts of organic or metal-based chiral mediators are highlighted with focus on the most recent developments up to July 2020. Examples of C-H functionalization, alkene functionalization, carboxylation and cross-electrophile couplings are discussed, along with their related mechanistic aspects.
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61
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Vandichel M, Laasonen K, Kondov I. Oxygen Evolution and Reduction on Fe-doped NiOOH: Influence of Solvent, Dopant Position and Reaction Mechanism. Top Catal 2020. [DOI: 10.1007/s11244-020-01334-8] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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62
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Preger Y, Johnson MR, Biswas S, Anson CW, Root TW, Stahl SS. Anthraquinone-Mediated Fuel Cell Anode with an Off-Electrode Heterogeneous Catalyst Accessing High Power Density when Paired with a Mediated Cathode. ACS ENERGY LETTERS 2020; 5:1407-1412. [PMID: 32856004 PMCID: PMC7447196 DOI: 10.1021/acsenergylett.0c00631] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
The development of processes for electrochemical energy conversion and chemical production could benefit from new strategies to interface chemical redox reactions with electrodes. Here, we employ a diffusible low-potential organic redox mediator, 9,10-anthraquinone-2,7-disulfonic acid (AQDS), to promote efficient electrochemical oxidation of H2 at an off-electrode heterogeneous catalyst. This unique approach to integrate chemical and electrochemical redox processes accesses power densities up to 228 mW/cm2 (528 mW/cm2 with iR-correction). These values are significantly higher than those observed in previous mediated electrochemical H2 oxidation methods, including those using enzymes or inorganic mediators. The approach described herein shows how traditional catalytic chemistry can be coupled to electrochemical devices.
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Affiliation(s)
- Yuliya Preger
- Department of Chemical and Biological Engineering, University of Wisconsin-Madison, Madison, WI-53706, USA
| | - Mathew R. Johnson
- Department of Chemistry, University of Wisconsin-Madison, Madison, WI-53706, USA
| | - Sourav Biswas
- Department of Chemistry, University of Wisconsin-Madison, Madison, WI-53706, USA
| | - Colin W. Anson
- Department of Chemistry, University of Wisconsin-Madison, Madison, WI-53706, USA
| | - Thatcher W. Root
- Department of Chemical and Biological Engineering, University of Wisconsin-Madison, Madison, WI-53706, USA
| | - Shannon S. Stahl
- Department of Chemistry, University of Wisconsin-Madison, Madison, WI-53706, USA
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