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Nanomaterials
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Nanomaterials for Catalytic Hydrogen Production
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Nanomaterials for Catalytic Hydrogen Production

A special issue of Nanomaterials (ISSN 2079-4991). This special issue belongs to the section "Energy and Catalysis".

Deadline for manuscript submissions: closed (30 November 2022) | Viewed by 2797

Special Issue Editor

Prof. Dr. Genqiang Zhang

E-Mail Website
Guest Editor
Hefei National Laboratory for Physical Sciences at the Microscale, CAS Key Laboratory of Materials for Energy Conversion, Department of Materials Science and Engineering, University of Science and Technology of China, Hefei 230026, China
Interests: nanomaterial; hydrogen evolution reaction; hydrazine oxidation reaction; transparent materials; heterojunction; electrocatalysts; photocatalysts

Special Issue Information

Dear Colleagues,

Hydrogen (H2) is seen as ideal clean energy on account of its high calorific value and pollution-free combustion products. Compared with the high energy consumption of fossil fuel, water splitting, ammonia resolution, and small molecule decomposition for hydrogen evolution are regarded as potential methods to replace the conventional process of hydrogen production due to the unique advantages of high hydrogen purity and feasible integration with renewable energy utilization techniques. The efficient hydrogen evolution catalysts obtained by adjusting the morphology and composition of nanomaterials have attracted widespread attention in recent reports. Surface-active sites can be regulated by the particle size and the morphology of nanomaterials, effectively enhancing catalytic performance. Similarly, the electronic configuration of heterojunction and alloys is tremendously different than the pristine one, which is beneficial to the activity and stability of nanomaterials.

The purpose of the Special Issue is to collect and report research on the hydrogen production of advanced nanomaterial catalysts with innovative synthesis methods, excellent catalytic performance, and comprehensive mechanism investigation. We invite authors to contribute original research articles and review articles covering current progress on nanomaterials in catalytic hydrogen production.

In this Special Issue, original research articles and reviews are welcome. Research areas may include (but are not limited to) the following: self-organization; heterogeneous catalysts; interface engineering; clusters as catalysts; nanoparticles as catalysts; noble metals as catalysts.

We look forward to receiving your contributions.

Prof. Dr. Genqiang Zhang
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. Nanomaterials 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 2900 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

  • hydrogen production
  • water splitting
  • nanomaterial catalysts
  • self-organization
  • heterogeneous catalysts
  • interface engineering
  • clusters
  • noble metals

Published Papers (2 papers)

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Research

19 pages, 6680 KiB  
Article
H2 Production by Methane Oxy-Reforming: Effect of Catalyst Pretreatment on the Properties and Activity of Rh-Ce0.5Zr0.5O2 Synthetized by Microemulsion
by Jacopo De Maron, Rodolfo Mafessanti, Pio Gramazio, Elisabetta Orfei, Andrea Fasolini and Francesco Basile
Nanomaterials 2023, 13(1), 53; https://0-doi-org.brum.beds.ac.uk/10.3390/nano13010053 - 22 Dec 2022
Cited by 5 | Viewed by 1254
Abstract
Green hydrogen introduction in hard-to-abate processes is held back by the cost of substituting steam reforming plants with electrolyzers. However, green hydrogen can be integrated in properly modified reforming processes. The process proposed here involves the substitution of steam reforming with oxy-reforming, which [...] Read more.
Green hydrogen introduction in hard-to-abate processes is held back by the cost of substituting steam reforming plants with electrolyzers. However, green hydrogen can be integrated in properly modified reforming processes. The process proposed here involves the substitution of steam reforming with oxy-reforming, which is the coupling of the former with catalytic partial oxidation (CPO), exploiting the pure oxygen coproduced during electrolysis to feed CPO, which allows for better heat exchange thanks to its exothermic nature. With the aim of developing tailored catalysts for the oxy-reforming process, Ce0.5Zr0.5O2 was synthetized by microemulsion and impregnated with Rh. The Ce-based supports were calcined at different temperatures (750 and 900 °C) and the catalysts were reduced at 750 °C or 500 °C. Tuning the calcination temperature allowed for an increase in the support surface area, resulting in well-dispersed Rh species that provided a high reducibility for both the metal active phase and the Ce-based support. This allowed for an increase in methane conversion under different conditions of contact time and pressure and the outperformance of the other catalysts. The higher activity was related to well-dispersed Rh species interacting with the support that provided a high concentration of surface OH* on the Ce-based support and increased methane dissociation. This anticipated the occurrence and the extent of steam reforming over the catalytic bed, producing a smoother thermal profile. Full article
(This article belongs to the Special Issue Nanomaterials for Catalytic Hydrogen Production)
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20 pages, 3784 KiB  
Article
Inhibiting the Laydown of Polymeric Carbon and Simultaneously Promoting Its Facile Burn-Off during the Industrial-Scale Production of Hydrogen with Nickel-Based Catalysts: Insights from Ab Initio Calculations
by Aniekan Magnus Ukpong
Nanomaterials 2023, 13(1), 40; https://0-doi-org.brum.beds.ac.uk/10.3390/nano13010040 - 22 Dec 2022
Viewed by 1826
Abstract
This paper presents a computational study of the mechanistic models for the laydown of carbon species on nickel surface facets and the burn-off models for their gasification mechanism in methane steam reforming based on density functional theory. Insights into catalyst design strategies for [...] Read more.
This paper presents a computational study of the mechanistic models for the laydown of carbon species on nickel surface facets and the burn-off models for their gasification mechanism in methane steam reforming based on density functional theory. Insights into catalyst design strategies for achieving the simultaneous inhibition of the laydown of polymeric carbon and the promotion of its burn-off are obtained by investigating the influence of single atom dopants on nickel surfaces. The effects of single atom dopants on adsorption energies are determined at both low and high carbon coverages on nickel and used to introduce appropriate thermodynamic descriptors of the associated surface reactions. It is found that the critical size of the nucleating polymeric carbon adatom contains three atoms, i.e., C3. The results show that the burn-off reaction of a polymeric carbon species is thermodynamically limited and hard to promote when the deposited carbon cluster grows beyond a critical size, C4. The introduction of single atom dopants into nickel surfaces is found to modify the structural stability and adsorption energies of carbon adatom species, as well as the free energy profiles of surface reactions for the burn-off reactions when CH4, H2O, H2, and CO species react to form hydrogen. The results reveal that materials development strategies that modify the sub-surface of the catalyst with potassium, strontium, or barium will inhibit carbon nucleation and promote burn-off, while surface doping with niobium, tungsten, or molybdenum will promote the laydown of polymeric carbon. This study provides underpinning insights into the reaction mechanisms for the coking of a nickel catalyst and the gasification routes that are possible for the recovery of a nickel catalyst during the steam reforming of methane for large-scale production of hydrogen. Full article
(This article belongs to the Special Issue Nanomaterials for Catalytic Hydrogen Production)
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