Special Issue "Novel Non-Precious Metal Electrocatalysts for Oxygen Electrode Reactions"

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

Deadline for manuscript submissions: 30 September 2018

Special Issue Editors

Guest Editor
Prof. Dr. Nicolas Alonso-Vante

IC2MP-UMR CNRS 7285, University of Poitiers, 86022 Poitiers, France
Website | E-Mail
Interests: electrochemistry; photoelectrochemistry; ORR-, HER-, OER-electrocatalysis; energy and fuels; nanomaterials; micro-fuel cells
Guest Editor
Prof. Dr. Yongjun Feng

State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology (BUCT), No. 15, Beisanhuan East Road, Chaoyang District, Beijing, 100029, China
Website 1 | Website 2 | E-Mail
Interests: non-platinum metal electrocatalysts; oxygen reduction reaction (ORR); oxygen evolution reaction (OER), multifunctional layered nanomaterials; layered double hydroxides (LDHs); high-performance adsorption materials; removal of heavy metals and phosphate
Guest Editor
Prof. Dr. Hui Yang

Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai Pudong New Area, Haike Road No. 99, Shanghai, 201210, China
Website | E-Mail
Interests: Pt-based electrocatalysts for fuel cells’ reaction non-precious metal catalyst for hydrogen oxidation and oxygen reduction reactions; new proton exchange membrane with high stability; direct methanol fuel cells; energy storage materials

Special Issue Information

Dear Colleagues,

Increasing inevitable global demands for energy have stimulated considerable research on alternative energy harvesting technologies, conversion and storage systems with high efficiency, cost-effective and environmentally friendly systems, such as fuel cells, rechargeable metal-air batteries, unitized regenerative cells, and water electrolyzers. In these devices, the conversion between oxygen and water plays a key step in the development of oxygen electrodes: Oxygen reduction reaction (ORR) and oxygen evolution reaction (OER). To date, the state-of-art catalysts for ORR consist of platinum-based materials (Pt), while ruthenium (Ru)- and iridium (Ir)-oxides are the best-known OER catalyst materials. The scarcity of precious metals, their prohibitive cost, and declining activity greatly hamper the practice for large-scale applications. It is of paramount practical importance and interest to develop efficient and stable materials for the oxygen electrode, based on Earth-abundant non-noble metals. With the fast development of advanced nanotechnology, novel non-precious metal electrocatalysts for the oxygen reactions have been explored based on the innovative design in chemical compositions, structure, and morphology, and supports.

This Special Issue aims to cover recent progress and advances in novel non-precious metal electrocatalysts tailoring with high activity and stablity for the catalytic conversion between water and oxygen. Additionally, electrocatalytic activity, selectivity, durability, and mechanism for single or bifunctional oxygen electrode reactions should be important subjects for this Special Issue.

Prof. Dr. Nicolas Alonso-Vante
Prof. Dr. Yongjun Feng
Prof. Dr. Hui Yang
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 papers will be 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 1300 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

  • Non-precious metal electrocatalysts
  • oxygen reduction reaction
  • oxygen evolution reaction
  • bifunctional electrocatalysts
  • electrocatalytic activity
  • electrocatalytic selectivity
  • electrocatalytic durability, unitizes fuel cells.

Published Papers (9 papers)

View options order results:
result details:
Displaying articles 1-9
Export citation of selected articles as:

Research

Jump to: Review

Open AccessArticle Engineering Mesoporous NiO with Enriched Electrophilic Ni3+ and O toward Efficient Oxygen Evolution
Catalysts 2018, 8(8), 310; https://doi.org/10.3390/catal8080310
Received: 29 June 2018 / Revised: 26 July 2018 / Accepted: 26 July 2018 / Published: 30 July 2018
PDF Full-text (2094 KB) | HTML Full-text | XML Full-text
Abstract
Tremendous efforts have been devoted to develop low-cost and highly active electrocatalysts for oxygen evolution reaction (OER). Here, we report the synthesis of mesoporous nickel oxide by the template method and its application in the title reaction. The as-prepared mesoporous NiO possesses a
[...] Read more.
Tremendous efforts have been devoted to develop low-cost and highly active electrocatalysts for oxygen evolution reaction (OER). Here, we report the synthesis of mesoporous nickel oxide by the template method and its application in the title reaction. The as-prepared mesoporous NiO possesses a large surface area, uniform mesopores, and rich surface electrophilic Ni3+ and O species. The overpotential of meso-NiO in alkaline medium is 132 mV at 10 mA cm−1 and 410 mV at 50 mA cm−1, which is much smaller than that of the other types of NiO samples. The improvement in the OER activity can be ascribed to the synergy of the large surface area and uniform mesopores for better mass transfer and high density of Ni3+ and O species favoring the nucleophilic attack by OH to form a NiOOH intermediate. The reaction process and the role of electrophilic Ni3+ and O were discussed in detail. This results are more conducive to the electrochemical decomposition of water to produce hydrogen fuel as a clean and renewable energy. Full article
Figures

Graphical abstract

Open AccessArticle Cobalt and Nitrogen Co-Doped Graphene-Carbon Nanotube Aerogel as an Efficient Bifunctional Electrocatalyst for Oxygen Reduction and Evolution Reactions
Catalysts 2018, 8(7), 275; https://doi.org/10.3390/catal8070275
Received: 13 June 2018 / Revised: 30 June 2018 / Accepted: 3 July 2018 / Published: 7 July 2018
PDF Full-text (2799 KB) | HTML Full-text | XML Full-text | Supplementary Files
Abstract
In this study, a low-cost and environmentally friendly method is developed to synthesize cobalt and nitrogen co-doped graphene-carbon nanotube aerogel (Co-N-GCA) as a bifunctional electrocatalyst for the oxygen reduction reaction (ORR) and the oxygen evolution reaction (OER). The as-prepared Co-N-GCA has a hierarchical
[...] Read more.
In this study, a low-cost and environmentally friendly method is developed to synthesize cobalt and nitrogen co-doped graphene-carbon nanotube aerogel (Co-N-GCA) as a bifunctional electrocatalyst for the oxygen reduction reaction (ORR) and the oxygen evolution reaction (OER). The as-prepared Co-N-GCA has a hierarchical meso- and macroporous structure with a high N doping level (8.92 at. %) and a large specific surface area (456 m2 g−1). In an alkaline medium, the catalyst exhibits superior ORR electrocatalytic activity with an onset potential 15 mV more positive than Pt/C, and its diffusion-limiting current density is 29% higher than that of commercial Pt/C. The obtained Co-N-GCA is also highly active toward the OER, with a small overpotential of 408 mV at a current density of 10 mA cm−2. Its overall oxygen electrode activity parameter (ΔE) is 0.821 V, which is comparable to most of the best nonprecious-metal catalysts reported previously. Furthermore, Co-N-GCA demonstrates superior durability in both the ORR and the OER, making it a promising noble-metal-free bifunctional catalyst in practical applications for energy conversion and storage. Full article
Figures

Figure 1

Open AccessArticle N,S Co-Doped Carbon Nanofibers Derived from Bacterial Cellulose/Poly(Methylene blue) Hybrids: Efficient Electrocatalyst for Oxygen Reduction Reaction
Catalysts 2018, 8(7), 269; https://doi.org/10.3390/catal8070269
Received: 26 May 2018 / Revised: 27 June 2018 / Accepted: 27 June 2018 / Published: 30 June 2018
PDF Full-text (4974 KB) | HTML Full-text | XML Full-text | Supplementary Files
Abstract
Exploring inexpensive and highly efficient electrocatalyst to decrease the overpotential of oxygen reduction reaction (ORR) is one of the key issues for the commercialization of energy conversion and storage devices. Heteroatom-doped carbon materials have attracted increasing attention as promising electrocatalysts. Herein, we prepared
[...] Read more.
Exploring inexpensive and highly efficient electrocatalyst to decrease the overpotential of oxygen reduction reaction (ORR) is one of the key issues for the commercialization of energy conversion and storage devices. Heteroatom-doped carbon materials have attracted increasing attention as promising electrocatalysts. Herein, we prepared a highly active electrocatalyst, nitrogen, sulfur co-doped carbon nanofibers (N/S-CNF), via in situ chemical oxidative polymerization of methylene blue on the bacterial cellulose nanofibers, followed by carbonization process. It was found that the type of nitrogen/sulfur source, methylene blue and poly(methylene blue), has significantly influence on the catalytic activity of the resultant carbon nanofibers. Benefiting from the porous structure and high surface area (729 m2/g) which favors mass transfer and exposing of active N and S atoms, the N/S-CNF displays high catalytic activity for the ORR in alkaline media with a half-wave potential of about 0.80 V, and better stability and stronger methanol tolerance than that of 20 wt % Pt/C, indicating great potential application in the field of alkaline fuel cell. Full article
Figures

Graphical abstract

Open AccessFeature PaperArticle Influence of the Structure-Forming Agent on the Performance of Fe-N-C Catalysts
Catalysts 2018, 8(7), 260; https://doi.org/10.3390/catal8070260
Received: 6 June 2018 / Revised: 21 June 2018 / Accepted: 25 June 2018 / Published: 28 June 2018
PDF Full-text (4222 KB) | HTML Full-text | XML Full-text
Abstract
In this work, the influence of the structure-forming agent on the composition, morphology and oxygen reduction reaction (ORR) activity of Fe-N-C catalysts was investigated. As structure-forming agents (SFAs), dicyandiamide (DCDA) (nitrogen source) or oxalic acid (oxygen source) or mixtures thereof were used. For
[...] Read more.
In this work, the influence of the structure-forming agent on the composition, morphology and oxygen reduction reaction (ORR) activity of Fe-N-C catalysts was investigated. As structure-forming agents (SFAs), dicyandiamide (DCDA) (nitrogen source) or oxalic acid (oxygen source) or mixtures thereof were used. For characterization, cyclic voltammetry and rotating disc electrode (RDE) experiments were performed in 0.1 M H2SO4. In addition to this, N2 sorption measurements and Raman spectroscopy were performed for the structural, and elemental analysis for chemical characterization. The role of metal, nitrogen and carbon sources within the synthesis of Fe-N-C catalysts has been pointed out before. Here, we show that the optimum in terms of ORR activity is achieved if both N- and O-containing SFAs are used in almost similar fractions. All catalysts display a redox couple, where its position depends on the fractions of SFAs. The SFA has also a strong impact on the morphology: Catalysts that were prepared with a larger fraction of N-containing SFA revealed a higher order in graphitization, indicated by bands in the 2nd order range of the Raman spectra. Nevertheless, the optimum in terms of ORR activity is obtained for the catalyst with highest D/G band ratio. Therefore, the results indicate that the presence of an additional oxygen-containing SFA is beneficial within the preparation. Full article
Figures

Figure 1

Open AccessFeature PaperArticle Binary Nitrogen Precursor-Derived Porous Fe-N-S/C Catalyst for Efficient Oxygen Reduction Reaction in a Zn-Air Battery
Catalysts 2018, 8(4), 158; https://doi.org/10.3390/catal8040158
Received: 2 March 2018 / Revised: 16 March 2018 / Accepted: 19 March 2018 / Published: 13 April 2018
PDF Full-text (5353 KB) | HTML Full-text | XML Full-text | Supplementary Files
Abstract
It is still a challenge to synthesize non-precious-metal catalysts with high activity and stability for the oxygen reduction reaction (ORR) to replace the state-of-the art Pt/C catalyst. Herein, a Fe, N, S co-doped porous carbon (Fe-NS/PC) is developed by using g-C3N
[...] Read more.
It is still a challenge to synthesize non-precious-metal catalysts with high activity and stability for the oxygen reduction reaction (ORR) to replace the state-of-the art Pt/C catalyst. Herein, a Fe, N, S co-doped porous carbon (Fe-NS/PC) is developed by using g-C3N4 and 2,4,6-tri(2-pyridyl)-1,3,5-triazine (TPTZ) as binary nitrogen precursors. The interaction of binary nitrogen precursors not only leads to the formation of more micropores, but also increases the doping amount of both iron and nitrogen dispersed in the carbon matrix. After a second heat-treatment, the best Fe/NS/C-g-C3N4/TPTZ-1000 catalyst exhibits excellent ORR performance with an onset potential of 1.0 V vs. reversible hydrogen electrode (RHE) and a half-wave potential of 0.868 V (RHE) in alkaline medium. The long-term durability is even superior to the commercial Pt/C catalyst. In the meantime, an assembled Zn-air battery with Fe/NS/C-g-C3N4/TPTZ-1000 as the cathode shows a maximal power density of 225 mW·cm−2 and excellent durability, demonstrating the great potential of practical applications in energy conversion devices. Full article
Figures

Figure 1

Open AccessArticle Preparation of Ag4Bi2O5/MnO2 Corn/Cob Like Nano Material as a Superior Catalyst for Oxygen Reduction Reaction in Alkaline Solution
Catalysts 2017, 7(12), 379; https://doi.org/10.3390/catal7120379
Received: 21 October 2017 / Revised: 30 November 2017 / Accepted: 30 November 2017 / Published: 6 December 2017
PDF Full-text (4892 KB) | HTML Full-text | XML Full-text | Supplementary Files
Abstract
Ag4Bi2O5/MnO2 nano-sized material was synthesized by a co-precipitation method in concentrated KOH solution. The morphology characterization indicates that MnO2 nanoparticles with a size of 20 nm are precipitated on the surface of nano Ag4
[...] Read more.
Ag4Bi2O5/MnO2 nano-sized material was synthesized by a co-precipitation method in concentrated KOH solution. The morphology characterization indicates that MnO2 nanoparticles with a size of 20 nm are precipitated on the surface of nano Ag4Bi2O5, forming a structure like corn on the cob. The obtained material with 60% Mn offers slightly higher initial potential (0.098 V vs. Hg/HgO) and limiting current density (−5.67 mA cm−2) at a rotating speed of 1600 rpm compared to commercial Pt/C (−0.047 V and −5.35 mA cm−2, respectively). Furthermore, the obtained material exhibits superior long-term durability and stronger methanol tolerance than commercial Pt/C. The remarkable features suggest that the Ag4Bi2O5/MnO2 nano-material is a very promising oxygen reduction reaction catalyst. Full article
Figures

Figure 1

Open AccessArticle A Novel Metal–Organic Framework Route to Embed Co Nanoparticles into Multi-Walled Carbon Nanotubes for Effective Oxygen Reduction in Alkaline Media
Catalysts 2017, 7(12), 364; https://doi.org/10.3390/catal7120364
Received: 1 November 2017 / Revised: 22 November 2017 / Accepted: 23 November 2017 / Published: 27 November 2017
PDF Full-text (10010 KB) | HTML Full-text | XML Full-text
Abstract
Metal–organic framework (MOF) materials can be used as precursors to prepare non-precious metal catalysts (NPMCs) for oxygen reduction reaction (ORR). Herein, we prepared a novel MOF material (denoted as Co-bpdc) and then combined it with multi-walled carbon nanotubes (MWCNTs) to form Co-bpdc/MWCNTs composites.
[...] Read more.
Metal–organic framework (MOF) materials can be used as precursors to prepare non-precious metal catalysts (NPMCs) for oxygen reduction reaction (ORR). Herein, we prepared a novel MOF material (denoted as Co-bpdc) and then combined it with multi-walled carbon nanotubes (MWCNTs) to form Co-bpdc/MWCNTs composites. After calcination, the cobalt ions from Co-bpdc were converted into Co nanoparticles, which were distributed in the graphite carbon layers and MWCNTs to form Co-bpdc/MWCNTs. The prepared catalysts were characterized by TEM (Transmission electron microscopy), XRD (X-ray diffraction), XPS (X-ray photoelectron spectroscopy), BET (Brunauer–Emmett–Teller), and Raman spectroscopy. The electrocatalytic activity was measured by using rotating disk electrode (RDE) voltammetry. The catalysts showed higher ORR catalytic activity than the commercial Pt/C catalyst in alkaline solution. Co-bpdc/MWCNTs-100 showed the highest ORR catalytic activity, with an initial reduction potential and half-wave potential reaching 0.99 V and 0.92 V, respectively. The prepared catalysts also showed superior stability and followed the 4-electron pathway ORR process in alkaline solution. Full article
Figures

Figure 1

Review

Jump to: Research

Open AccessReview Three-Dimensional Heteroatom-Doped Nanocarbon for Metal-Free Oxygen Reduction Electrocatalysis: A Review
Catalysts 2018, 8(8), 301; https://doi.org/10.3390/catal8080301
Received: 12 June 2018 / Revised: 26 June 2018 / Accepted: 27 June 2018 / Published: 27 July 2018
PDF Full-text (5946 KB) | HTML Full-text | XML Full-text
Abstract
The oxygen reduction reaction (ORR) at the cathode is a fundamental process and functions a pivotal role in fuel cells and metal–air batteries. However, the electrochemical performance of these technologies has been still challenged by the high cost, scarcity, and insufficient durability of
[...] Read more.
The oxygen reduction reaction (ORR) at the cathode is a fundamental process and functions a pivotal role in fuel cells and metal–air batteries. However, the electrochemical performance of these technologies has been still challenged by the high cost, scarcity, and insufficient durability of the traditional Pt-based ORR electrocatalysts. Heteroatom-doped nanocarbon electrocatalysts with competitive activity, enhanced durability, and acceptable cost, have recently attracted increasing interest and hold great promise as substitute for precious-metal catalysts (e.g., Pt and Pt-based materials). More importantly, three-dimensional (3D) porous architecture appears to be necessary for achieving high catalytic ORR activity by providing high specific surface areas with more exposed active sites and large pore volumes for efficient mass transport of reactants to the electrocatalysts. In this review, recent progress on the design, fabrication, and performance of 3D heteroatom-doped nanocarbon catalysts is summarized, aiming to elucidate the effects of heteroatom doping and 3D structure on the ORR performance of nanocarbon catalysts, thus promoting the design of highly active nanocarbon-based ORR electrocatalysts. Full article
Figures

Figure 1

Open AccessReview Host-Guest Engineering of Layered Double Hydroxides towards Efficient Oxygen Evolution Reaction: Recent Advances and Perspectives
Catalysts 2018, 8(5), 214; https://doi.org/10.3390/catal8050214
Received: 29 March 2018 / Revised: 17 April 2018 / Accepted: 25 April 2018 / Published: 17 May 2018
PDF Full-text (3576 KB) | HTML Full-text | XML Full-text
Abstract
Electrochemical water splitting has great potential in the storage of intermittent energy from the sun, wind, or other renewable sources for sustainable clean energy applications. However, the anodic oxygen evolution reaction (OER) usually determines the efficiency of practical water electrolysis due to its
[...] Read more.
Electrochemical water splitting has great potential in the storage of intermittent energy from the sun, wind, or other renewable sources for sustainable clean energy applications. However, the anodic oxygen evolution reaction (OER) usually determines the efficiency of practical water electrolysis due to its sluggish four-electron process. Layered double hydroxides (LDHs) have attracted increasing attention as one of the ideal and promising electrocatalysts for water oxidation due to their excellent activity, high stability in basic conditions, as well as their earth-abundant compositions. In this review, we discuss the recent progress on LDH-based OER electrocatalysts in terms of active sites, host-guest engineering, and catalytic performances. Moreover, further developments and challenges in developing promising electrocatalysts based on LDHs are discussed from the viewpoint of molecular design and engineering. Full article
Figures

Figure 1

Back to Top