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Catalysts
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Advances in Sustainable Electrocatalytic Processes using Carbon and Metal Oxide...
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Advances in Sustainable Electrocatalytic Processes using Carbon and Metal Oxide Nanomaterials

A special issue of Catalysts (ISSN 2073-4344). This special issue belongs to the section "Electrocatalysis".

Deadline for manuscript submissions: closed (31 December 2022) | Viewed by 5040

Special Issue Editors

Dr. Marta Susete da Silva Nunes

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Guest Editor
REQUIMTE/LAQV, Departamento de Química e Bioquímica, Faculdade de Ciências, Universidade do Porto, Rua do Campo Alegre s/n, 4169-007 Porto, Portugal
Interests: materials chemistry; environment-related catalysis; electrocatalysis; photocatalysis
Special Issues, Collections and Topics in MDPI journals
Dr. Diana M. Fernandes

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Guest Editor
REQUIMTE-LAQV, Departamento de Química e Bioquímica, Faculdade de Ciências, Universidade do Porto, Porto, Portugal
Interests: electrocatalysis; energy-related reactions; nanochemistry and nanotechnology; materials chemistry; CO2 valorization; carbon-based materials; metal oxides; biomass
Special Issues, Collections and Topics in MDPI journals
Dr. Mariana Rocha

E-Mail Website
Guest Editor
IFIMUP, Instituto de Física de Materiais Avançados, Nanotecnologia e Fotónica, Departamento de Física e Astronomia, Faculdade de Ciências, Universidade do Porto, 4169‐007 Porto, Portugal
Interests: nanomaterials; metal nanoparticles; metal and non-metal oxide nanoparticles; energy harvesting; healthcare sensors

Special Issue Information

Dear Colleagues,

Electrocatalysis deals with the catalysis of redox reactions and plays a key role in a proposed human-made sustainable future. The field of electrocatalysis has grown notably, mainly driven by the urgent need for advanced catalytic materials in several research fields, namely corrosion science, electroanalytical sensors, wastewater treatment, and mainly electrochemical energy conversion and storage technologies and electrosynthesis. Some electrocatalytic processes have a prominent position today considering the future switch to a carbon‐neutral economy, as is the case with hydrogen evolution, oxygen evolution and oxygen reduction reactions, CO2 and nitrogen electroreduction, and biomass upgrading.

This Special Issue aims to cover the latest advances in electrocatalytic-related applications, including the preparation and characterization of promising electrocatalysts, evaluation of their performances, and theoretical studies about the electrocatalytic mechanisms involved.

It is our pleasure to invite you to submit a full paper, detailed review, mini-review or significant preliminary communication related to advanced electrocatalysis.

Dr. Marta Nunes
Dr. Diana Fernandes
Dr. Mariana Rocha
Guest Editors

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. Catalysts is an international peer-reviewed open access monthly 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 2700 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

  • Advanced electrocatalysis
  • Electrocatalysts
  • Energy-related technologies
  • Hydrogen and oxygen reactions
  • Electrosynthesis
  • CO2 reduction
  • Wastewater treatment
  • Electro-Fenton processes
  • Electroanalytical sensors
  • Corrosion

Published Papers (2 papers)

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Research

18 pages, 7237 KiB  
Article
Improved the Methanol Electro-Oxidation and Carbon Monoxide Tolerance for Direct Methanol Fuel Cells Using Strontium Molybdate
by Tzu Hsuan Chiang and Jia-Wei Hsu
Catalysts 2022, 12(7), 676; https://0-doi-org.brum.beds.ac.uk/10.3390/catal12070676 - 21 Jun 2022
Cited by 4 | Viewed by 1732
Abstract
A high methanol electro-oxidation (MOR) and carbon monoxide (CO) tolerance satisfied the electrochemical requirements of direct methanol fuel cells (DMFCs). The study investigated strontium molybdate (SrMoO4) mixed with Vulcan XC-72, carbon-loaded with 20% Pt. The electrochemical performance was confirmed by MOR [...] Read more.
A high methanol electro-oxidation (MOR) and carbon monoxide (CO) tolerance satisfied the electrochemical requirements of direct methanol fuel cells (DMFCs). The study investigated strontium molybdate (SrMoO4) mixed with Vulcan XC-72, carbon-loaded with 20% Pt. The electrochemical performance was confirmed by MOR and CO tolerance activities measured via cyclic voltammetry (CV). The synergistic effect between Pt and SrMoO4 is essential to affect the electrochemical characteristic. SrMoO4 can help remove CO-like intermediate products on the Pt surface, enhancing electrochemical performance for DMFCs. In addition, HxMoO3/HyMoO3 existence in Sr0.5Mo0.5O4−δ can quickly remove intermediates from Pt surfaces and accelerate the transformation of adsorbed intermediates to CO2. The results obtained showed that 20%-Pt/uncalcined Sr0.5Mo0.5O4−δ-C electrocatalyst has higher MOR and CO tolerance ability in DMFCs. Furthermore, the fabricated DMFC shows excellent long-term electrochemical stability after 1000 cycles and a maximum power density (1.42 mW/cm2) higher than commercial 20%-Pt/C (1.27 mW/cm2). Full article
(This article belongs to the Special Issue Advances in Sustainable Electrocatalytic Processes using Carbon and Metal Oxide Nanomaterials)
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14 pages, 2774 KiB  
Article
Synergetic Effects of Mixed-Metal Polyoxometalates@Carbon-Based Composites as Electrocatalysts for the Oxygen Reduction and the Oxygen Evolution Reactions
by Inês S. Marques, Bruno Jarrais, Israël-Martyr Mbomekallé, Anne-Lucie Teillout, Pedro de Oliveira, Cristina Freire and Diana M. Fernandes
Catalysts 2022, 12(4), 440; https://0-doi-org.brum.beds.ac.uk/10.3390/catal12040440 - 14 Apr 2022
Cited by 2 | Viewed by 2319
Abstract
The smart choice of polyoxometalates (POMs) and the design of POM@carbon-based composites are promising tools for producing active electrocatalysts for both the oxygen reduction (ORR) and the oxygen evolution reactions (OER). Hence, herein, we report the preparation, characterization and application of three composites [...] Read more.
The smart choice of polyoxometalates (POMs) and the design of POM@carbon-based composites are promising tools for producing active electrocatalysts for both the oxygen reduction (ORR) and the oxygen evolution reactions (OER). Hence, herein, we report the preparation, characterization and application of three composites based on doped, multi-walled carbon nanotubes (MWCNT_N6) and three different POMs (Na12[(FeOH2)2Fe2(As2W15O56)2]·54H2O, Na12[(NiOH2)2Ni2(As2W15O56)2]·54H2O and Na14[(FeOH2)2Ni2(As2W15O56)2]·55H2O) as ORR and OER electrocatalysts in alkaline medium (pH = 13). Overall, the three POM@MWCNT_N6 composites showed good ORR performance with onset potentials between 0.80 and 0.81 V vs. RHE and diffusion-limiting current densities ranging from −3.19 to −3.66 mA cm−2. Fe4@MWCNT_N6 and Fe2Ni2@MWCNT_N6 also showed good stability after 12 h (84% and 80% of initial current). The number of electrons transferred per O2 molecule was close to three, suggesting a mixed regime. Moreover, the Fe2Ni2@MWCNT_N6 presented remarkable OER performance with an overpotential of 0.36 V vs. RHE (for j = 10 mA cm−2), a jmax close to 135 mA cm−2 and fast kinetics with a Tafel slope of 45 mV dec−1. More importantly, this electrocatalyst outperformed not only most POM@carbon-based composites reported so far but also the state-of-the-art RuO2 electrocatalyst. Thus, this work represents a step forward towards bifunctional electrocatalysts using less expensive materials. Full article
(This article belongs to the Special Issue Advances in Sustainable Electrocatalytic Processes using Carbon and Metal Oxide Nanomaterials)
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