{"title":"溶剂类型和成分对掺硼有序介孔碳合成的影响","authors":"Silver Güneş","doi":"10.1016/j.micromeso.2024.113235","DOIUrl":null,"url":null,"abstract":"<div><p>Boron-doped ordered mesoporous carbons (B-OMCs) were synthesized using different solvent types and compositions to study the effect of the solvent medium on the physical properties and oxygen reduction activities of the resultant structures. Materials were synthesized by a one-pot self-assembly method, using resorcinol and formaldehyde as carbon source, boric acid as boron source and triblock copolymer Pluronic F127 as the structure directing agent. Different solvents, namely ethanol, n-propanol, isopropanol and acetone were used as solvent media along with water as the cosolvent. Among different solvents, ethanol and n-propanol gave better-ordered structures and also had higher surface areas. At this stage, the highest boron doping percentage was obtained as 1.38 % with n-propanol. In the second stage, B-OMCs were synthesized with n-propanol in different water/n-propanol (W/N) molar ratios varying between 2.5 and 4.75. The orderliness was observed to be better in samples with low W/N ratios of 2.5 and 3.25 and the morphologies shifted from 2D to 3D interconnected type with the increase of water content. The average pore sizes of samples varied between 7.9 and 9.7 nm. On the other hand, the highest surface area (729 m<sup>2</sup>/g) and the highest boron doping percentage (1.53 %) were obtained with the W/N ratio of 4. XPS analysis showed that 23 % (w/w) of doped boron in this sample was in substitutional state while the remaining boron was found in mixed B–C and B–O states. Cyclic voltammetry measurements for the samples with W/N ratios of 2.5, 3.25 and 4 showed significant oxygen reduction activities at −0.28 and −0.29 V. Results showed that the properties of solvent play an effective role in the orderliness, pore structure and surface composition of B-OMCs, which in turn affect their electrochemical properties. Among different types of solvents, n-propanol can be used as an alternative to ethanol with the W/N ratio of 4 giving the highest surface area and boron doping percentage.</p></div>","PeriodicalId":392,"journal":{"name":"Microporous and Mesoporous Materials","volume":null,"pages":null},"PeriodicalIF":4.8000,"publicationDate":"2024-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"The effect of solvent type and composition on the synthesis of boron-doped ordered mesoporous carbons\",\"authors\":\"Silver Güneş\",\"doi\":\"10.1016/j.micromeso.2024.113235\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>Boron-doped ordered mesoporous carbons (B-OMCs) were synthesized using different solvent types and compositions to study the effect of the solvent medium on the physical properties and oxygen reduction activities of the resultant structures. Materials were synthesized by a one-pot self-assembly method, using resorcinol and formaldehyde as carbon source, boric acid as boron source and triblock copolymer Pluronic F127 as the structure directing agent. Different solvents, namely ethanol, n-propanol, isopropanol and acetone were used as solvent media along with water as the cosolvent. Among different solvents, ethanol and n-propanol gave better-ordered structures and also had higher surface areas. At this stage, the highest boron doping percentage was obtained as 1.38 % with n-propanol. In the second stage, B-OMCs were synthesized with n-propanol in different water/n-propanol (W/N) molar ratios varying between 2.5 and 4.75. The orderliness was observed to be better in samples with low W/N ratios of 2.5 and 3.25 and the morphologies shifted from 2D to 3D interconnected type with the increase of water content. The average pore sizes of samples varied between 7.9 and 9.7 nm. On the other hand, the highest surface area (729 m<sup>2</sup>/g) and the highest boron doping percentage (1.53 %) were obtained with the W/N ratio of 4. XPS analysis showed that 23 % (w/w) of doped boron in this sample was in substitutional state while the remaining boron was found in mixed B–C and B–O states. Cyclic voltammetry measurements for the samples with W/N ratios of 2.5, 3.25 and 4 showed significant oxygen reduction activities at −0.28 and −0.29 V. Results showed that the properties of solvent play an effective role in the orderliness, pore structure and surface composition of B-OMCs, which in turn affect their electrochemical properties. Among different types of solvents, n-propanol can be used as an alternative to ethanol with the W/N ratio of 4 giving the highest surface area and boron doping percentage.</p></div>\",\"PeriodicalId\":392,\"journal\":{\"name\":\"Microporous and Mesoporous Materials\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":4.8000,\"publicationDate\":\"2024-06-28\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Microporous and Mesoporous Materials\",\"FirstCategoryId\":\"88\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S1387181124002579\",\"RegionNum\":3,\"RegionCategory\":\"材料科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"CHEMISTRY, APPLIED\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Microporous and Mesoporous Materials","FirstCategoryId":"88","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S1387181124002579","RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CHEMISTRY, APPLIED","Score":null,"Total":0}
The effect of solvent type and composition on the synthesis of boron-doped ordered mesoporous carbons
Boron-doped ordered mesoporous carbons (B-OMCs) were synthesized using different solvent types and compositions to study the effect of the solvent medium on the physical properties and oxygen reduction activities of the resultant structures. Materials were synthesized by a one-pot self-assembly method, using resorcinol and formaldehyde as carbon source, boric acid as boron source and triblock copolymer Pluronic F127 as the structure directing agent. Different solvents, namely ethanol, n-propanol, isopropanol and acetone were used as solvent media along with water as the cosolvent. Among different solvents, ethanol and n-propanol gave better-ordered structures and also had higher surface areas. At this stage, the highest boron doping percentage was obtained as 1.38 % with n-propanol. In the second stage, B-OMCs were synthesized with n-propanol in different water/n-propanol (W/N) molar ratios varying between 2.5 and 4.75. The orderliness was observed to be better in samples with low W/N ratios of 2.5 and 3.25 and the morphologies shifted from 2D to 3D interconnected type with the increase of water content. The average pore sizes of samples varied between 7.9 and 9.7 nm. On the other hand, the highest surface area (729 m2/g) and the highest boron doping percentage (1.53 %) were obtained with the W/N ratio of 4. XPS analysis showed that 23 % (w/w) of doped boron in this sample was in substitutional state while the remaining boron was found in mixed B–C and B–O states. Cyclic voltammetry measurements for the samples with W/N ratios of 2.5, 3.25 and 4 showed significant oxygen reduction activities at −0.28 and −0.29 V. Results showed that the properties of solvent play an effective role in the orderliness, pore structure and surface composition of B-OMCs, which in turn affect their electrochemical properties. Among different types of solvents, n-propanol can be used as an alternative to ethanol with the W/N ratio of 4 giving the highest surface area and boron doping percentage.
期刊介绍：
Microporous and Mesoporous Materials covers novel and significant aspects of porous solids classified as either microporous (pore size up to 2 nm) or mesoporous (pore size 2 to 50 nm). The porosity should have a specific impact on the material properties or application. Typical examples are zeolites and zeolite-like materials, pillared materials, clathrasils and clathrates, carbon molecular sieves, ordered mesoporous materials, organic/inorganic porous hybrid materials, or porous metal oxides. Both natural and synthetic porous materials are within the scope of the journal.
Topics which are particularly of interest include:
All aspects of natural microporous and mesoporous solids
The synthesis of crystalline or amorphous porous materials
The physico-chemical characterization of microporous and mesoporous solids, especially spectroscopic and microscopic
The modification of microporous and mesoporous solids, for example by ion exchange or solid-state reactions
All topics related to diffusion of mobile species in the pores of microporous and mesoporous materials
Adsorption (and other separation techniques) using microporous or mesoporous adsorbents
Catalysis by microporous and mesoporous materials
Host/guest interactions
Theoretical chemistry and modelling of host/guest interactions
All topics related to the application of microporous and mesoporous materials in industrial catalysis, separation technology, environmental protection, electrochemistry, membranes, sensors, optical devices, etc.
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