Journal profile · Engineering-Engineering (miscellaneous)
Hydrogen
ISSN 2673-4141 · MDPI AG · Switzerland
Hydrogen: CAS Zone 4 · Engineering (2026 Xinrui edition); impact factor 5.6 (journal website); JCR Q2 (journal website); fully open access; APC charged, amount not published; review about 7 weeks (community reports); 126 articles in 2025; indexed in ESCI and Scopus.
Scope
Aims, scope and focus
Hydrogen is published by MDPI AG and is classed under Engineering in the CAS Journal Ranking. By OpenAlex counts of its recent articles, its largest topics are Hybrid Renewable Energy Systems, Hydrogen Storage and Materials and Catalysts for Methane Reforming, together about 39.4% of its articles. (generated from OpenAlex topic counts and CAS ranking data)
Topics of interest include (but are not limited to) the following: Hydrogen generation and production; Hydrogen properties; Physics and chemistry of hydrogen; Hydrogen safety; Hydrogen storage; Hydrogen applications; Hydrogen transport, distribution, and infrastructure; Hydrogen-related energy generation; Hydrogen isotopes; Atomic and molecular hydrogen; Hydrogen phases; Hydrogen compounds; Hydrogen-related reactions; Environmental aspects and impact of hydrogen energy technologies.
From the journal's Aims & Scope
Research area (LetPub): Engineering-Engineering (miscellaneous)
Main research topics OpenAlex counts of recent articles; shares are approximate
- Hybrid Renewable Energy SystemsEnergy21.4%
- Hydrogen Storage and MaterialsMaterials Science12%
- Catalysts for Methane ReformingChemical Engineering6%
- Combustion and Detonation ProcessesEngineering5.1%
- Fuel Cells and Related MaterialsEngineering4.8%
- Spacecraft and Cryogenic TechnologiesEngineering4%
- Integrated Energy Systems OptimizationEngineering3.9%
- Electrocatalysts for Energy ConversionEnergy3.7%
Rankings & indexing
CAS ranking and database indexing
CAS Journal Ranking
CAS Journal Ranking, upgraded edition (March 2025)Not covered
Not covered by this edition.
CAS Xinrui Journal Ranking (March 2026)Engineering Zone 4
| Level | Category | Zone |
|---|---|---|
| Major | Engineering | Zone 4 |
| Minor | Chemistry, Physical | Zone 4 |
| Minor | Energy & Fuels | Zone 4 |
Top journal: noReview journal: not marked
CAS Journal Ranking, previous upgraded edition (December 2023)Not covered
Not covered by this edition.
JCR / CiteScore quartiles on the journal's website
- JCR Q2 · Chemistry, Physical · 2026
Publisher-reported: JCR figures are Clarivate's and CiteScore figures Scopus's to confirm; both are a different system from the CAS zones.Publisher website
Database indexing
ESCIScopusDOAJLetPub
International journal early-warning lists: not listed in any editionLetPub
Indexing the journal's website claims
EI CompendexWeb of ScienceCASPublisher website
As the journal's website lists them, not checked against each database; for Web of Science editions the records above apply.
Editions, and major and minor categories, are shown separately and never merged into one zone; check which edition your institution uses before you submit or report.
Metrics
Impact metrics and publication volume
Impact
- Impact factor (publisher) 2025
- 5.6Publisher website ·
- 5-year impact factor (publisher) 2025
- 5.3Publisher website ·
- CiteScore 2026-06
- 5.6LetPub ·
- CiteScore (publisher)
- 5.6Publisher website ·
- SJR 2026-06
- 0.69LetPub ·
- SNIP 2026-06
- 1LetPub ·
- h-index
- 29OpenAlex ·
- i10-index
- 106OpenAlex ·
- 2-year mean citedness
- 4.58OpenAlex ·
- Self-citation rate
- 8.9%LetPub ·
- Share of gold OA articles
- 100%LetPub ·
Volume
- Articles per year
- 126LetPub ·
Articles by year OpenAlex count · 501 in total · the current year is incomplete
| Year | Articles | Open access | Citations |
|---|---|---|---|
| 2026 | 144 | 144 | 84 |
| 2025 | 126 | 126 | 754 |
| 2024 | 74 | 74 | 736 |
| 2023 | 58 | 58 | 957 |
| 2022 | 36 | 36 | 433 |
| 2021 | 25 | 25 | 807 |
Sources count differently and were observed at different times, so each source's own value is kept; "publisher" marks figures from the journal's website.
Review & acceptance
Review time and acceptance
- Average review time (community reports)
- about 7 weeksLetPub ·
- Submission to first decision
- 14.6 daysPublisher website ·
- Acceptance to publication
- 3.9 daysPublisher website ·
- Submission to publication (journal-reported)
- about 7 weeksDOAJ ·
- Peer review
- Single anonymous peer reviewDOAJ
Community reports come from authors' own submissions (confidence 0.5) and are not a promise from the journal; for publisher figures, the journal's own definitions apply.
Fees & open access
APC and open-access policy
Fully open accessDOAJ
Every article is open access; authors usually pay an article processing charge (APC).
| Source | APC | Fee waiver | License | Observed |
|---|---|---|---|---|
| DOAJ | CHF 1,000 | Yes | CC BY | |
| OpenAlex | CHF 1,000 | — | — | |
| LetPub | CHF 1,000 | Yes | — | |
| Publisher website | Yes, amount not published | — | — |
The journal's website is authoritative for fees; sources were observed at different times and each keeps its own value, without averaging.
Submission
Article types and submission policies (journal website)
What to prepare7 items from the author guidelines
- Abstract
- ≤ 200 words
- Reference style
- Author–date
- Templates
- LaTeX and Word
- First submission
- Free format: the journal's layout is not required
- Suggested reviewers
- Required, 3
- Graphical abstract
- Optional
- Cover letter
- Required
Article types accepted20
- articleArticle: These are original research manuscripts. The work should report scientifically sound experiments and provide a substantial amount of new information. T…Length not stated
- book reviewAll Article Types Article Review Communication Editorial Abstract Book Review Brief Communication Brief Report Case Report Clinicopathological Challenge Comment…Length not stated
- brief communicationAll Article Types Article Review Communication Editorial Abstract Book Review Brief Communication Brief Report Case Report Clinicopathological Challenge Comment…Length not stated
- brief reportAll Article Types Article Review Communication Editorial Abstract Book Review Brief Communication Brief Report Case Report Clinicopathological Challenge Comment…Length not stated
- case reportAll Article Types Article Review Communication Editorial Abstract Book Review Brief Communication Brief Report Case Report Clinicopathological Challenge Comment…Length not stated
- commentaryAll Article Types Article Review Communication Editorial Abstract Book Review Brief Communication Brief Report Case Report Clinicopathological Challenge Comment…Length not stated
- conference reportAll Article Types Article Review Communication Editorial Abstract Book Review Brief Communication Brief Report Case Report Clinicopathological Challenge Comment…Length not stated
- editorialAll Article Types Article Review Communication Editorial Abstract Book Review Brief Communication Brief Report Case Report Clinicopathological Challenge Comment…Length not stated
- hypothesisAll Article Types Article Review Communication Editorial Abstract Book Review Brief Communication Brief Report Case Report Clinicopathological Challenge Comment…Length not stated
- letterAll Article Types Article Review Communication Editorial Abstract Book Review Brief Communication Brief Report Case Report Clinicopathological Challenge Comment…Length not stated
- opinionAll Article Types Article Review Communication Editorial Abstract Book Review Brief Communication Brief Report Case Report Clinicopathological Challenge Comment…Length not stated
- perspectiveAll Article Types Article Review Communication Editorial Abstract Book Review Brief Communication Brief Report Case Report Clinicopathological Challenge Comment…Length not stated
- protocolAll Article Types Article Review Communication Editorial Abstract Book Review Brief Communication Brief Report Case Report Clinicopathological Challenge Comment…Length not stated
- registered reportAll Article Types Article Review Communication Editorial Abstract Book Review Brief Communication Brief Report Case Report Clinicopathological Challenge Comment…Length not stated
- reviewAll Article Types Article Review Communication Editorial Abstract Book Review Brief Communication Brief Report Case Report Clinicopathological Challenge Comment…Length not stated
- scoping reviewA Scoping Review type can be submitted as a Review. The structure is similar to that of a review. Scoping reviews should strictly follow the PRISMA extension fo…Length not stated
- systematic reviewAll Article Types Article Review Communication Editorial Abstract Book Review Brief Communication Brief Report Case Report Clinicopathological Challenge Comment…Length not stated
- technical noteAll Article Types Article Review Communication Editorial Abstract Book Review Brief Communication Brief Report Case Report Clinicopathological Challenge Comment…Length not stated
- tutorialAll Article Types Article Review Communication Editorial Abstract Book Review Brief Communication Brief Report Case Report Clinicopathological Challenge Comment…Length not stated
- viewpointAll Article Types Article Review Communication Editorial Abstract Book Review Brief Communication Brief Report Case Report Clinicopathological Challenge Comment…Length not stated
Policy excerpts from the journal's websiteAuthorship, Conflicts of interest, Data availability, Publication ethics, License & copyright, Open access, Peer review, Preprints
- Authorship Authorship
MDPI follows the International Committee of Medical Journal Editors (ICMJE) guidelines which state that, in order to qualify for authorship of a manuscript, the following criteria should be observed: Make substantial contributions to the conception or design of the work, or the acquisition, analysis, or interpretation of data for the work; Draft the work or review it critically for important intel…
Source ↗Publisher website ·- Conflicts of interest Conflicts of Interest
Citation policy: sources must be clearly cited, permission obtained where appropriate, and excessive self-citation is not allowed. Model summary
According to The International Committee of Medical Journal Editors, “Authors should avoid entering into agreements with study sponsors, both for-profit and non-profit, that interfere with authors’ access to all of the study’s data or that interfere with their ability to analyze and interpret the data and to prepare and publish manuscripts independently when and where they choose.” All authors mus…
Source ↗Publisher website ·- Data availability Data availability statements
Data availability statements are required for all articles published with MDPI. Model summary
Data availability statements are required for all articles published with MDPI. During the peer review and editorial decision process, authors can be asked to share existing datasets or raw data that have been analyzed in the manuscript, and whether they will be made available to other researchers following publication. Authors will also be asked for the details of any existing datasets that have …
Source ↗Publisher website ·- Publication ethics Publication Ethics Statement
MDPI is a member of the Committee on Publication Ethics (COPE). We fully adhere to its Code of Conduct and to its Best Practice Guidelines. The editors of this journal enforce a rigorous peer review process together with strict ethical policies and standards to ensure to add high quality scientific works to the field of scholarly publication. Unfortunately, cases of plagiarism, data falsification,…
Source ↗Publisher website ·- License & copyright Copyright / Open Access
Articles published in Hydrogen will be Open-Access articles distributed under the terms and conditions of the Creative Commons Attribution License (CC BY). The copyright is retained by the author(s). MDPI will insert the following note at the end of the published text: © 2026 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and c…
Source ↗Publisher website ·- Open access Open access publication fees
If you transfer your manuscript to another open access (OA) journal, you will be charged an Article Processing Charge (APC) if your article is accepted for publication. The APC for each journal can be found on the individual journal’s website. For more information about APCs, please see here.
Source ↗Publisher website ·- Peer review Editorial Process and Peer Review
All submissions are thoroughly peer-reviewed by experts within the field and undergo a structured editorial workflow designed to ensure quality, transparency, and scientific integrity. The full editorial procedure is available on the Editorial Process page and is also provided below. Pre-check Pre-check consists of a technical pre-check performed by the Editorial Office and an editorial pre-check …
Source ↗Publisher website ·- Preprints Preprints and Conference Papers
Hydrogen accepts submissions that have previously been made available as preprints provided that they have not undergone peer review. A preprint is a draft version of a paper made available online before submission to a journal. MDPI operates Preprints, a preprint server to which submitted papers can be uploaded directly after completing journal submission. Note that Preprints operates independent…
Source ↗Publisher website ·
Excerpts are quoted from the journal's website; "model summary" lines are written by Workers AI and checked against the text. The journal's website is authoritative.
Profile
Publication details and official links
- Publisher
- MDPI AG
- Country or region
- Switzerland
- Language
- English
- ISSN
- 2673-4141
- Latest issue on the website
- Volume 7 (2026)
- Official links
- Journal homepage ↗LetPub
- Submission system ↗Publisher website
- Author guidelines ↗LetPub
- Aims & Scope ↗LetPub
- Special issues ↗Publisher website
- APC information ↗DOAJ
- Fee waivers ↗DOAJ
- Open access statement ↗DOAJ
- License & copyright ↗DOAJ
- Peer review process ↗LetPub
- Editorial board ↗LetPub
FAQ
Frequently asked questions about Hydrogen
What CAS zone is Hydrogen in?
In the 2026 Xinrui edition it is in Zone 4 of Engineering. Zones from different editions, and from major and minor categories, are not interchangeable.
What is the impact factor of Hydrogen?
The journal's website gives an impact factor of 5.6 (2025); this is the journal's own figure, as LetPub lists none for it; CiteScore 5.6, h-index 29.
How long does peer review take at Hydrogen?
Authors report an average review time of about 7 weeks. Article statistics cover accepted papers only, publisher figures follow the journal's own definitions, and community reports come from authors' own submissions; none is a promise from the journal.
What JCR quartile is Hydrogen in?
The journal's website gives JCR Q2; by category, Chemistry, Physical Q2. JCR quartiles are Clarivate's to confirm and a different system from the CAS zones.
What are the manuscript requirements of Hydrogen?
According to the journal's author guidelines: Abstract: ≤ 200 words; Reference style: Author–date; Templates: LaTeX and Word; First submission: Free format: the journal's layout is not required; Suggested reviewers: Required, 3; Graphical abstract: Optional; Cover letter: Required. A model extracted these from the author guidelines and each was checked against the text; check the latest version on the journal's website before submitting.
Which databases index Hydrogen?
According to LetPub and DOAJ records, Hydrogen is indexed in ESCI, Scopus and DOAJ. The journal's website also lists EI Compendex, Web of Science and CAS; that list has not been checked against each database.
Is Hydrogen open access, and what is the APC?
Hydrogen is a fully open-access journal. APC charged, amount not published.
Sources and updates
The facts on this page come from LetPub, Publisher website, OpenAlex, DOAJ; every figure is tagged with its source and the date it was observed, and conflicting values are kept per source. LetPub source page: view ↗ (archived 2026-08-26). Last updated: .