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Analysis of institutional authors

Toledo-Camacho SyCorresponding AuthorContreras SAuthorMedina FAuthor

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September 27, 2021
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Photocatalytic hydrogen production from water-methanol and -glycerol mixtures using Pd/TiO2(-WO3) catalysts and validation in a solar pilot plant

Publicated to:International Journal Of Hydrogen Energy. 46 (73): 36152-36166 - 2021-10-22 46(73), DOI: 10.1016/j.ijhydene.2021.08.141

Authors: Toledo-Camacho, S Y; Rey, A; Maldonado, M I; Llorca, J; Contreras, S; Medina, F

Affiliations

CIEMAT-Plataforma Solar de Almería - Author
Plataforma Solar Almeria CIEMAT, Carretera Senes Km 4, Almeria 04200, Spain - Author
Univ Extremadura, Dept Ingenieria Quim & Quim Fis, Av Elvas S-N, Badajoz 06006, Spain - Author
Univ Politecn Cataluna, Dept Chem Engn, Barcelona 08019, Spain - Author
Univ Politecn Cataluna, Inst Tecn Energet, Barcelona Res Ctr Multiscale Sci & Engn, Barcelona 08019, Spain - Author
Univ Rovira & Virgili, Dept Enginyeria Quim, Av Paisos Catalans 26, Tarragona 43007, Spain - Author
Universidad de Extremadura - Author
Universitat Politècnica de Catalunya - Author
Universitat Rovira i Virgili - Author
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Abstract

This paper is focused on the photocatalytic hydrogen production on Pd/TiO2(-WO3) catalysts from water-methanol and water-glycerol mixtures under UVA and solar irradiation. The photodeposition method for Pd was studied varying conditions such as Pd amount, catalyst concentration and methanol concentration. The catalysts were tested at lab scale under simulated solar light and UVA radiation and also at large scale (25 L) under solar energy using a pilot-scale solar Compound Parabolic Collector (CPC). The catalysts characterization was performed by means of ICP-OES, N2 adsorption–desorption isotherms, XRD, HR-TEM, XPS and DR–UV–Vis spectroscopy. Hydrogen evolution was monitored by on-line gas chromatography.From results it was found the Pd photodeposition method plays a key role to increase the hydrogen evolution, affecting parameters like the Pd amount deposited, the Pd nanoparticles size and dispersion. The highest quantum efficiency (ϕ) obtained in this study was 11.8% and 41.2% under simulated solar and UVA irradiation, respectively, using Pd(0.24 wt%)/P25 in an aqueous solution of methanol (50 vol%). In the pilot-scale solar CPC, for Pd(0.24 wt%)//P25 catalysts in 5 vol% of methanol or glycerol as sacrificial agents, the quantum yield were 2.1 and 2.2%, respectively. When the concentration of the sacrificial agents decreased to 0.37 vol%, the quantum yields were 1.3 and 2.4% for methanol and glycerol, respectively. Compared to literature, the low noble metal content of these catalysts (0.25 wt%) seems to be a competitive factor considering their high price.

Keywords

auethanolevolutiongenerationhydrogennanoparticlespdphotodepositionquantum efficiencysacrificial agentssystemstitaniavisible-lightHydrogenPhotocatalysisPhotodepositionQuantum efficiencySacrificial agentsSimultaneous degradation

Quality index

Bibliometric impact. Analysis of the contribution and dissemination channel

The work has been published in the journal International Journal Of Hydrogen Energy due to its progression and the good impact it has achieved in recent years, according to the agency Scopus (SJR), it has become a reference in its field. In the year of publication of the work, 2021, it was in position , thus managing to position itself as a Q1 (Primer Cuartil), in the category Condensed Matter Physics.

From a relative perspective, and based on the normalized impact indicator calculated from the Field Citation Ratio (FCR) of the Dimensions source, it yields a value of: 2.46, which indicates that, compared to works in the same discipline and in the same year of publication, it ranks as a work cited above average. (source consulted: Dimensions Oct 2025)

Specifically, and according to different indexing agencies, this work has accumulated citations as of 2025-10-20, the following number of citations:

  • WoS: 12
  • Scopus: 19
  • Google Scholar: 17

Impact and social visibility

From the perspective of influence or social adoption, and based on metrics associated with mentions and interactions provided by agencies specializing in calculating the so-called "Alternative or Social Metrics," we can highlight as of 2025-10-20:

  • The use, from an academic perspective evidenced by the Altmetric agency indicator referring to aggregations made by the personal bibliographic manager Mendeley, gives us a total of: 42.
  • The use of this contribution in bookmarks, code forks, additions to favorite lists for recurrent reading, as well as general views, indicates that someone is using the publication as a basis for their current work. This may be a notable indicator of future more formal and academic citations. This claim is supported by the result of the "Capture" indicator, which yields a total of: 42 (PlumX).

With a more dissemination-oriented intent and targeting more general audiences, we can observe other more global scores such as:

  • The Total Score from Altmetric: 0.5.
  • The number of mentions on the social network X (formerly Twitter): 1 (Altmetric).

It is essential to present evidence supporting full alignment with institutional principles and guidelines on Open Science and the Conservation and Dissemination of Intellectual Heritage. A clear example of this is:

  • The work has been submitted to a journal whose editorial policy allows open Open Access publication.
  • Assignment of a Handle/URN as an identifier within the deposit in the Institutional Repository: http://hdl.handle.net/20.500.11797/imarina9228600

Leadership analysis of institutional authors

There is a significant leadership presence as some of the institution’s authors appear as the first or last signer, detailed as follows: First Author (Toledo Camacho, Sandra Yurani) and Last Author (Medina Cabello, Francisco).

the author responsible for correspondence tasks has been Toledo Camacho, Sandra Yurani.