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Catalysts
Special Issues
Tailored Nanosystems and Nanocatalysts for Electrocatalytic Applications
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Tailored Nanosystems and Nanocatalysts for Electrocatalytic Applications

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

Deadline for manuscript submissions: closed (30 September 2023) | Viewed by 7534

Special Issue Editors

Prof. Dr. Liangliang Feng

E-Mail Website
Guest Editor
School of Materials Science & Engineering, Shaanxi University of Science & Technology, Xi'an 710021, China
Interests: electrocatalysis; inorganic synthesis; energy conversion materials; hydrogen production; fuel cell
Special Issues, Collections and Topics in MDPI journals
Dr. Yipu Liu

E-Mail Website
Guest Editor
State Key Laboratory of Marine Resource Utilization in South China Sea, School of Materials Science and Engineering, Hainan University, Haikou 570228, China
Interests: inorganic materials; electrochemistry; heterogeneous catalysis; water electrolysis; CO2 reduction reaction; nitrogen reduction
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Electrocatalysis plays a pivotal role in bridging electrical energy and valuable chemicals, further paving the way for renewable energy utilization and environmental protection. More specifically, some key reactions, such as hydrogen evolution reaction (HER), oxygen evolution reaction (OER), oxygen reduction reaction (ORR), nitrogen reduction reaction (NRR), and CO2 reduction reaction (CO2RR), should be carefully investigated to achieve an ideal water cycle, nitrogen cycle, and carbon cycle for sustainable energy conversions. For this purpose, cutting-edge research should focus on developing the corresponding nanosystems and nanocatalysts. Accordingly, this Special Issue mainly focuses on advanced electrocatalytic systems including water electrolyzers, fuel cells and metal-air batteries, together with effective catalyst design and catalytic mechanism development. Topics of interest include but are not limited to anything from nanomaterials to devices, from freshwater to seawater, and from experimental efforts to theoretical calculations, which may substantially contribute to (i) identifying reasonable ‘structure–activity’ for catalysts and (ii) constructing long-lasting systems for practical application.

Dr. Liangliang Feng
Dr. Yipu Liu
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

  • electrochemistry
  • water electrolysis
  • fuel cell
  • nitrogen reduction reaction
  • CO2 reduction reaction
  • nanomaterials

Related Special Issue

Published Papers (5 papers)

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Research

12 pages, 4567 KiB  
Article
V6O13 Micro-Flower Arrays Grown In Situ on Ni Foam as Efficient Electrocatalysts for Hydrogen Evolution at Large Current Densities
by Yajie Xie, Jianfeng Huang, Yufei Wang, Liyun Cao, Yong Zhao, Koji Kajiyoshi, Yijun Liu and Liangliang Feng
Catalysts 2023, 13(5), 914; https://doi.org/10.3390/catal13050914 - 22 May 2023
Cited by 3 | Viewed by 1108
Abstract
Developing a high-activity, robust and economic electrocatalyst for large-scale green hydrogen production is still of great significance. Herein, a novel V6O13 nanosheets self-assembled micro-flower array self-supporting electrode is synthesized using a facile one-pot hydrothermal route. Owing to the large electrochemically [...] Read more.
Developing a high-activity, robust and economic electrocatalyst for large-scale green hydrogen production is still of great significance. Herein, a novel V6O13 nanosheets self-assembled micro-flower array self-supporting electrode is synthesized using a facile one-pot hydrothermal route. Owing to the large electrochemically active surface area of a unique hierarchical micro-flower and the stable all-in-one structure, the as-prepared V6O13/NF electrode delivers impressive HER activity with extremely low overpotentials of 125 and 298 mV at large current densities of 100 and 1000 mA cm−2, respectively, and a long-term durability for at least 90 h in an alkaline condition. This work extends the application of vanadium oxides to the realm of electrocatalytic hydrogen fuel production. Full article
(This article belongs to the Special Issue Tailored Nanosystems and Nanocatalysts for Electrocatalytic Applications)
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14 pages, 7143 KiB  
Article
Tailoring CoNi Alloy-Embedded Carbon Nanofibers by Coaxial Electrospinning for an Enhanced Oxygen Reduction Reaction
by Haibo Ouyang, Leer Bao, Jinfan Liu, Cuiyan Li and Ru Gao
Catalysts 2023, 13(5), 890; https://doi.org/10.3390/catal13050890 - 15 May 2023
Viewed by 1313
Abstract
A flexible CoNi@CNF electrochemical catalyst was developed using coaxial electrostatic spinning technology. The distribution and content of CoNi alloy nanoparticles on the surface of carbon fibers were adjusted by regulating the feed speed ratio of the outer and inner axes of coaxial electrostatic [...] Read more.
A flexible CoNi@CNF electrochemical catalyst was developed using coaxial electrostatic spinning technology. The distribution and content of CoNi alloy nanoparticles on the surface of carbon fibers were adjusted by regulating the feed speed ratio of the outer and inner axes of coaxial electrostatic spinning. The results indicate that the content of the CoNi alloy distributed on the carbon fiber surface increased from 26.7 wt.% to 38.4 wt.% with an increase in the feed speed of the inner axis. However, the excessive precipitation of the CoNi alloy on the carbon fiber surface leads to the segregation of the internal CoNi alloy, which is unfavorable for the exposure of active sites during the electrolytic reaction. The best electrocatalytic performance of the composite was achieved when the rate of the outer axis feed speed was constant (3 mm/h) and the rate of the inner axis was 1.5 mm/h. The initial oxygen reduction potential and half-slope potential were 0.99 V and 0.92 V (VS RHE), respectively. The diffusion-limited current density was 6.31 mA/cm−2 and the current strength retention was 95.2% after the 20,000 s timed current test. Full article
(This article belongs to the Special Issue Tailored Nanosystems and Nanocatalysts for Electrocatalytic Applications)
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10 pages, 1662 KiB  
Article
Spinel LiMn2O4 as Electrocatalyst toward Solid-State Zinc–Air Batteries
by Guoqing Zhang, Peng Zhang, Shuying Kong and Binbin Jin
Catalysts 2023, 13(5), 860; https://doi.org/10.3390/catal13050860 - 9 May 2023
Cited by 3 | Viewed by 1167
Abstract
Efficient oxygen reduction reaction (ORR) electrocatalysts are the key to advancement of solid-state alkaline zinc–air batteries (ZAB). We demonstrate an electrocatalyst, spinel lithium-manganese oxide LiMn2O4 (LMO) by a simple hydrothermal method. Scanning electron microscope (SEM), X-ray diffraction (XRD), and Raman [...] Read more.
Efficient oxygen reduction reaction (ORR) electrocatalysts are the key to advancement of solid-state alkaline zinc–air batteries (ZAB). We demonstrate an electrocatalyst, spinel lithium-manganese oxide LiMn2O4 (LMO) by a simple hydrothermal method. Scanning electron microscope (SEM), X-ray diffraction (XRD), and Raman spectra indicate that the as-synthesized LiMn2O4 presents nanoscale irregular-shaped particles with the well-known spinel structure. The polarization curve, chronoamperometery curve, and linear scanning voltammograms of rotating disk electrode (RDE) results reveal that the as-synthesized LiMn2O4 possesses a higher electrocatalytic activity than that of electrolytic manganese dioxide for the ORR. A solid-state zinc–air cell with LiMn2O4 as the air electrode catalyst has a long voltage plateau of discharge and a discharge capacity of 188.4 mAh at a constant discharge current density of 10 mA·cm−2. In summary, spinel LiMn2O4 in which the JT effect enables electron hoping between Mn3+ and Mn4+ can be regarded as an effective robust oxygen reduction catalyst. Full article
(This article belongs to the Special Issue Tailored Nanosystems and Nanocatalysts for Electrocatalytic Applications)
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12 pages, 2733 KiB  
Article
Heterostructured Cu/CuO Nanoparticles Embedded within N-Doped Carbon Nanosheets for Efficient Oxygen Reduction Reaction
by Guoting Xu, Jianfeng Huang, Xiaoyi Li, Qian Chen, Yajie Xie, Zhenting Liu, Koji Kajiyoshi, Lingling Wu, Liyun Cao and Liangliang Feng
Catalysts 2023, 13(2), 255; https://doi.org/10.3390/catal13020255 - 22 Jan 2023
Cited by 3 | Viewed by 1727
Abstract
The development of cost-effective and highly efficient oxygen reduction reaction (ORR) electrocatalysts is an essential component of renewable clean energy technologies, such as fuel cells and metal/air cells, but remains a huge and long-term challenge. Here, novel heterogeneous Cu/CuO nanoparticles embedded within N-doped [...] Read more.
The development of cost-effective and highly efficient oxygen reduction reaction (ORR) electrocatalysts is an essential component of renewable clean energy technologies, such as fuel cells and metal/air cells, but remains a huge and long-term challenge. Here, novel heterogeneous Cu/CuO nanoparticles embedded within N-doped carbon nanosheets (Cu/CuO@NC-900) are successfully synthesized by combining a facile hydrothermal route with a solid calcination technique. Benefitting from the electronic interaction between Cu and CuO, the generated abundant highly active Cu-Nx active sites and the high conductivity of the N-doped carbon nanosheets, the resulting Cu/CuO@NC-900 material shows superior ORR performance in alkaline media, exhibiting a high half-wave potential of ~0.868 V, and a robust stability and methanol tolerance, even outperforming commercial 20 wt% Pt/C. Our study opens up a new avenue for the rational design and fabrication of efficient and durable noble-metal-free Cu-based electrocatalysts for energy conversion and storage. Full article
(This article belongs to the Special Issue Tailored Nanosystems and Nanocatalysts for Electrocatalytic Applications)
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9 pages, 4561 KiB  
Article
Large-Scale Preparation of Ultrathin Bimetallic Nickel Iron Sulfides Branch Nanoflake Arrays for Enhanced Hydrogen Evolution Reaction
by Shengjue Deng, Changsheng Liu, Yan Zhang, Yingxi Ji, Bingbao Mei, Zhendong Yao and Shiwei Lin
Catalysts 2023, 13(1), 174; https://doi.org/10.3390/catal13010174 - 11 Jan 2023
Cited by 5 | Viewed by 1551
Abstract
Developing the large-scale preparation of non-noble metal catalysts with high performance is crucial for promoting the electrochemical production of hydrogen from water. In this work, a novel TiO2@FeNi2S4 (TiO2@FNS) branch nanoflake array on Ni foam can [...] Read more.
Developing the large-scale preparation of non-noble metal catalysts with high performance is crucial for promoting the electrochemical production of hydrogen from water. In this work, a novel TiO2@FeNi2S4 (TiO2@FNS) branch nanoflake array on Ni foam can be prepared at a large scale (50 cm2) by combining an atomic-layer-deposited (ALD) TiO2 skeleton with one-step facile low-temperature (<100 °C) sulfurization method. As-prepared TiO2@FNS arrays exhibit excellent hydrogen evolution reaction (HER) performance with an overpotential of 97 mV at 10 mA cm−2, superior to the FNS counterpart (without TiO2 coating) and other reported catalysts. The enhanced HER catalytic performance of TiO2@FNS is attributed to the increased specific surface area and improved structural stability due to the introduction of TiO2 coating. Moreover, theoretical calculations also show that the bimetallic NFS structure is more favorable to the dissociation of water molecule and the desorption of H than the monometallic Ni3S2 counterpart. With the combination of experimental results and theoretical calculations, this work has enlightened a new way of exploring high-efficient catalysts for HER. Full article
(This article belongs to the Special Issue Tailored Nanosystems and Nanocatalysts for Electrocatalytic Applications)
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