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Advances in Nanostructured Catalysts
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Advances in Nanostructured Catalysts

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Catalytic Materials".

Deadline for manuscript submissions: closed (20 July 2022) | Viewed by 13705

Special Issue Editor

Dr. Youn Jeong Jang

E-Mail Website
Guest Editor
Department of Chemical Engineering, Hanyang University, Seoul 04763, Korea
Interests: photocatalyst; electrocatalyst; electrochemical CO2 reduction; electrochemical N2 reduction; ammonia production; water splitting

Special Issue Information

Dear Colleagues,

For the past few decades, nanostructured catalysts have seen rapid development in energy-based technologies and an increasing demand for sustainable fuel production and utilization. Interestingly, the nanostructure of catalysts with a designed shape, pore, modified surface, and so on affects various steps for catalytic reaction pathways, including adsorption, desorption, diffusion, separation, charge transfer, and so on. Therefore, nanostructured materials find important applications in all catalysis.

This Special Issue will focus on state-of-the-art catalysis with an emphasis on contributions on nanostructures. For example, a research topic to be covered in this Special Issue is new technologies or novel approaches to prepare nanostructured materials, both experimentally and theoretically. Furthermore, applications in catalysis using nanostructured materials will be covered. The potential applications include energy storage, including supercapacitors, batteries, and flow batteries, energy conversion, including fuel cells and solar cells, sustainable fuel production via (photo)electrolysis, and other catalytic processes.

We kindly invite you to submit a manuscript(s) for this Special Issue on “Advances in Nanostructured Catalysts”. Full papers, communications, and reviews are all welcome.

Dr. Youn Jeong Jang
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Materials is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • nanostructure
  • catalyst
  • electrocatalyst
  • photocatalyst
  • energy application

Published Papers (6 papers)

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Research

13 pages, 3434 KiB  
Article
Pullulan Oxidation in the Presence of Hydrogen Peroxide and N-Hydroxyphthalimide
by Gabriela Biliuta, Raluca Ioana Baron and Sergiu Coseri
Materials 2022, 15(17), 6086; https://doi.org/10.3390/ma15176086 - 02 Sep 2022
Cited by 1 | Viewed by 1295
Abstract
The C-6 in the maltotriose unit of pullulan was oxidized in an alkaline medium (pH = 10), utilizing a green method that included hydrogen peroxide (H2O2) as an oxidant and N-hydroxyphthalimide (NHPI) as a catalyst for various reaction [...] Read more.
The C-6 in the maltotriose unit of pullulan was oxidized in an alkaline medium (pH = 10), utilizing a green method that included hydrogen peroxide (H2O2) as an oxidant and N-hydroxyphthalimide (NHPI) as a catalyst for various reaction times. The structure of the resulting oxidized pullulans (PO) was carefully characterized by titration, intrinsic viscosity, FTIR, 13C-NMR, and zeta potential. The content of carboxyl groups in PO was dependent on reaction time and varied accordingly. Furthermore, a fast reaction rate was found in the first 2–3 h of the reaction, followed by a decreased rate in the subsequent hours. FTIR and 13C-NMR proved that the selective oxidation of the primary alcohol groups of pullulan was achieved. The oxidation also caused the glycoside linkages in the pullulan chain to break, and the viscosity of the pullulan itself went down. Full article
(This article belongs to the Special Issue Advances in Nanostructured Catalysts)
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13 pages, 1877 KiB  
Article
Effects of Mono- and Bifunctional Surface Ligands of Cu–In–Se Quantum Dots on Photoelectrochemical Hydrogen Production
by Soo Ik Park, Sung-Mok Jung, Jae-Yup Kim and Jiwoong Yang
Materials 2022, 15(17), 6010; https://doi.org/10.3390/ma15176010 - 31 Aug 2022
Cited by 3 | Viewed by 1966
Abstract
Semiconductor nanocrystal quantum dots (QDs) are promising materials for solar energy conversion because of their bandgap tunability, high absorption coefficient, and improved hot-carrier generation. CuInSe2 (CISe)-based QDs have attracted attention because of their low toxicity and wide light-absorption range, spanning visible to [...] Read more.
Semiconductor nanocrystal quantum dots (QDs) are promising materials for solar energy conversion because of their bandgap tunability, high absorption coefficient, and improved hot-carrier generation. CuInSe2 (CISe)-based QDs have attracted attention because of their low toxicity and wide light-absorption range, spanning visible to near-infrared light. In this work, we study the effects of the surface ligands of colloidal CISe QDs on the photoelectrochemical characteristics of QD-photoanodes. Colloidal CISe QDs with mono- and bifunctional surface ligands are prepared and used in the fabrication of type-II heterojunction photoanodes by adsorbing QDs on mesoporous TiO2. QDs with monofunctional ligands are directly attached on TiO2 through partial ligand detachment, which is beneficial for electron transfer between QDs and TiO2. In contrast, bifunctional ligands bridge QDs and TiO2, increasing the amount of QD adsorption. Finally, photoanodes fabricated with oleylamine-passivated QDs show a current density of ~8.2 mA/cm2, while those fabricated with mercaptopropionic-acid-passivated QDs demonstrate a current density of ~6.7 mA/cm2 (at 0.6 VRHE under one sun illumination). Our study provides important information for the preparation of QD photoelectrodes for efficient photoelectrochemical hydrogen generation. Full article
(This article belongs to the Special Issue Advances in Nanostructured Catalysts)
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9 pages, 2027 KiB  
Article
Solar-Driven Syngas Production Using Al-Doped ZnTe Nanorod Photocathodes
by Youn Jeong Jang, Chohee Lee, Yong Hyun Moon and Seokwoo Choe
Materials 2022, 15(9), 3102; https://doi.org/10.3390/ma15093102 - 25 Apr 2022
Cited by 2 | Viewed by 1850
Abstract
Syngas, traditionally produced from fossil fuels and natural gases at high temperatures and pressures, is an essential precursor for chemicals utilized in industry. Solar-driven syngas production can provide an ideal pathway for reducing energy consumption through simultaneous photoelectrochemical CO2 and water reduction [...] Read more.
Syngas, traditionally produced from fossil fuels and natural gases at high temperatures and pressures, is an essential precursor for chemicals utilized in industry. Solar-driven syngas production can provide an ideal pathway for reducing energy consumption through simultaneous photoelectrochemical CO2 and water reduction at ambient temperatures and pressures. This study performs photoelectrochemical syngas production using highly developed Al-doped ZnTe nanorod photocathodes (Al:ZnTe), prepared via an all-solution process. The facile photo-generated electrons are transferred by substitutional Al doping on Zn sites in one-dimensional arrays to increase the photocurrent density to −1.1 mA/cm2 at −0.11 VRHE, which is 3.5 times higher than that for the pristine ZnTe. The Al:ZnTe produces a minor CO (FE ≈ 12%) product by CO2 reduction and a major product of H2 (FE ≈ 60%) by water reduction at −0.11 VRHE. Furthermore, the product distribution is perfectly switched by simple modification of Au deposition on photocathodes. The Au coupled Al:ZnTe exhibits dominant CO production (FE ≈ 60%), suppressing H2 evolution (FE ≈ 15%). The strategies developed in this study, nanostructuring, doping, and surface modification of photoelectrodes, can be applied to drive significant developments in solar-driven fuel production. Full article
(This article belongs to the Special Issue Advances in Nanostructured Catalysts)
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22 pages, 7801 KiB  
Article
Effect of Preparation Method on the Catalytic Performance of HZSM-5 Zeolite Catalysts in the MTH Reaction
by Junhua Gao, Hao Zhou, Fucan Zhang, Keming Ji, Ping Liu, Zenghou Liu and Kan Zhang
Materials 2022, 15(6), 2206; https://doi.org/10.3390/ma15062206 - 17 Mar 2022
Cited by 7 | Viewed by 1988
Abstract
A kind of nano-ZSM-5 zeolite crystal was synthesized by the hydrothermal method, and HZSM-5 zeolite powder was obtained via acid exchange. By using pseudoboehmite as a binder, a series of HZSM-5 zeolite catalysts for methanol-to-hydrocarbons (MTH) were prepared through adjusting the binder content [...] Read more.
A kind of nano-ZSM-5 zeolite crystal was synthesized by the hydrothermal method, and HZSM-5 zeolite powder was obtained via acid exchange. By using pseudoboehmite as a binder, a series of HZSM-5 zeolite catalysts for methanol-to-hydrocarbons (MTH) were prepared through adjusting the binder content between 20 and 50% in addition to the molding method of wet extrusion and mechanical mixing. XRD, 27Al NMR, SEM-EDS, ICP, low-temperature N2 adsorption and desorption, NH3-TPD, Py-FTIR, FT-IR, TG and elemental analyses were used to characterize the properties of fresh catalysts and coke-deposited catalysts. Then, MTH catalytic performance was evaluated in a continuous-flow fixed-bed reactor. The characterization and evaluation results showed that the addition of dilute nitric acid during the molding process increased the amount of moderate-strength acid and formed a hierarchical pore distribution, which helped to reduce the reaction ability of cracking, aromatization and hydrogen transfer, improve the diffusion properties of the catalyst and slow down the coke deposition rate. The catalyst with a binder content of 30% made by wet extrusion with dilute nitric acid had the best performance, whose activity stability of MTH increased by 96 h, higher than other catalysts, and the coke deposition rate was slower, which was due to the most suitable distribution of acid strength and B/L ratio as well as the most obvious hierarchical pore structure. Full article
(This article belongs to the Special Issue Advances in Nanostructured Catalysts)
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11 pages, 10549 KiB  
Article
Direct One-Step Growth of Bimetallic Ni2Mo3N on Ni Foam as an Efficient Oxygen Evolution Electrocatalyst
by Sang Heon Park, Soon Hyung Kang and Duck Hyun Youn
Materials 2021, 14(16), 4768; https://doi.org/10.3390/ma14164768 - 23 Aug 2021
Cited by 11 | Viewed by 2805
Abstract
A simple and economical synthetic route for direct one-step growth of bimetallic Ni2Mo3N nanoparticles on Ni foam substrate (Ni2Mo3N/NF) and its catalytic performance during an oxygen evolution reaction (OER) are reported. The Ni2Mo [...] Read more.
A simple and economical synthetic route for direct one-step growth of bimetallic Ni2Mo3N nanoparticles on Ni foam substrate (Ni2Mo3N/NF) and its catalytic performance during an oxygen evolution reaction (OER) are reported. The Ni2Mo3N/NF catalyst was obtained by annealing a mixture of a Mo precursor, Ni foam, and urea at 600 °C under N2 flow using one-pot synthesis. Moreover, the Ni2Mo3N/NF exhibited high OER activity with low overpotential values (336.38 mV at 50 mA cm−2 and 392.49 mV at 100 mA cm−2) and good stability for 5 h in Fe-purified alkaline electrolyte. The Ni2Mo3N nanoparticle surfaces converted into amorphous surface oxide species during the OER, which might be attributed to the OER activity. Full article
(This article belongs to the Special Issue Advances in Nanostructured Catalysts)
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10 pages, 2418 KiB  
Article
Nanostructured Iron Sulfide/N, S Dual-Doped Carbon Nanotube-Graphene Composites as Efficient Electrocatalysts for Oxygen Reduction Reaction
by Gyu Sik Chae, Duck Hyun Youn and Jae Sung Lee
Materials 2021, 14(9), 2146; https://doi.org/10.3390/ma14092146 - 23 Apr 2021
Cited by 19 | Viewed by 2949
Abstract
Nanostructured FeS dispersed onto N, S dual-doped carbon nanotube–graphene composite support (FeS/N,S:CNT–GR) was prepared by a simple synthetic method. Annealing an ethanol slurry of Fe precursor, thiourea, carbon nanotube, and graphene oxide at 973 K under N2 atmosphere and subsequent acid treatment [...] Read more.
Nanostructured FeS dispersed onto N, S dual-doped carbon nanotube–graphene composite support (FeS/N,S:CNT–GR) was prepared by a simple synthetic method. Annealing an ethanol slurry of Fe precursor, thiourea, carbon nanotube, and graphene oxide at 973 K under N2 atmosphere and subsequent acid treatment produced FeS nanoparticles distributed onto the N, S-doped carbon nanotube–graphene support. The synthesized FeS/N,S:CNT–GR catalyst exhibited significantly enhanced electrochemical performance in the oxygen reduction reaction (ORR) compared with bare FeS, FeS/N,S:GR, and FeS/N,S:CNT with a small half-wave potential (0.827 V) in an alkaline electrolyte. The improved ORR performance, comparable to that of commercial Pt/C, could be attributed to synergy between the small FeS nanoparticles with a high activity and the N, S-doped carbon nanotube–graphene composite support providing high electrical conductivity, large surface area, and additional active sites. Full article
(This article belongs to the Special Issue Advances in Nanostructured Catalysts)
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