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Catalysts
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Carbon-Based Materials as Efficient Electrocatalysts for Oxygen Evolution Reaction
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Carbon-Based Materials as Efficient Electrocatalysts for Oxygen Evolution Reaction

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

Deadline for manuscript submissions: closed (31 January 2024) | Viewed by 2273

Special Issue Editor

Dr. Jun Yang

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Guest Editor
School of Materials Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, China
Interests: transition metal compound; controlled synthesis; electronic structure modulation; energy storage; high efficiency electrocatalysis; water splitting; oxygen reduction reaction; mechanism investigation; theoretical calculation
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

It is important for regenerative fuel cells, rechargeable metal–air batteries, and water splitting to find reasonably designed nonprecious metal catalysts, which have efficient and durable electrocatalytic activities for oxygen evolution reaction (OER). Different strategies have been put out over the last few decades to enhance OER kinetics. Doping, among them, is a quick and effective way to alter the OER kinetics of a catalyst by adding additional or heteroatoms to the host lattice. Various doping techniques and associated OER mechanisms of cutting-edge catalysts are reported, including those made of metal oxides (such as noble metal oxides, perovskite oxides, spinel oxides, and hydroxides), non-oxides (such as metal sulfides, metal selenides, metal phosphides, metal nitrides, and metal carbides), and carbon-based catalysts (graphene, carbon nanotubes, and others). However, the OER process of doped catalysts differs depending on the host lattice and the dopant. Guidelines for building effective carbon-based catalysts are provided by a fundamental understanding of the doping effects on the OER from both experimental and theoretical studies.

Dr. Jun Yang
Guest Editor

Manuscript Submission Information

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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

  • defect regulation of carbon-based materials
  • structural engineering of carbon-based materials
  • in-situ mechanism studies of OER
  • theoretical calculation of carbon-based materials for OER

Published Papers (2 papers)

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Research

12 pages, 2518 KiB  
Article
Cyanogel-Based Preparation of Amorphous NiFe Nanoaggregates with Enhanced Activity and Stability for OER
by Shun Li, Jinxin Wan, Zhenyuan Liu, Mengdie Zhuang, Pengyuan Ren, Weilong Shi, Xiaojun Zeng and Jun Yang
Catalysts 2023, 13(9), 1261; https://doi.org/10.3390/catal13091261 - 31 Aug 2023
Viewed by 815
Abstract
The development of cost-efficient electrocatalysts for oxygen evolution reaction (OER) with high efficiency is crucial to widespread applications of water splitting for hydrogen production. In this work, porous three-dimensional (3D) amorphous NiFe nanoaggregates composed of interconnected nanograins were synthesized by a cyanogel-based wet [...] Read more.
The development of cost-efficient electrocatalysts for oxygen evolution reaction (OER) with high efficiency is crucial to widespread applications of water splitting for hydrogen production. In this work, porous three-dimensional (3D) amorphous NiFe nanoaggregates composed of interconnected nanograins were synthesized by a cyanogel-based wet chemical reduction method using the NiCl2/Na4Fe(CN)6 cyanogel as the precursor and NaBH4 as the reducing agent. The influence of the incorporated Fe amount was carefully studied by slightly changing the feeding molar ratios of the Ni/Fe atoms in the precursors. The intrinsic 3D backbone structure of the cyanogel resulted in crystal nuclei tending to generate along with the backbones, which is key to the formation of NiFe nanoaggregates with a porous 3D interconnected structure. The synthesized NiFe nanoaggregates with a 3D interconnected structure and high porosity, as well as the incorporation of Fe, are in favor of high surface area, more active sites, and abundant oxygen vacancies, leading to superior activity and stability of OER in alkaline electrolytes with a low overpotential of 0.35 V at 10 mA cm−2, a high current density of 24.8 mA cm−2 at 1.65 V, a small Tafel slope of 76.9 mV dec−1, and attractive durability in 1 M KOH solution. Full article
(This article belongs to the Special Issue Carbon-Based Materials as Efficient Electrocatalysts for Oxygen Evolution Reaction)
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16 pages, 28979 KiB  
Article
The Self-Supporting NiMn-LDHs/rGO/NF Composite Electrode Showing Much Enhanced Electrocatalytic Performance for Oxygen Evolution Reaction
by Jia Wang and Yongfu Lian
Catalysts 2023, 13(6), 1012; https://doi.org/10.3390/catal13061012 - 16 Jun 2023
Cited by 1 | Viewed by 1123
Abstract
The poor conductivity and instability of layered dihydroxides (LDHs) limit their widespread application in oxygen evolution reaction (OER). In this study, the composite electrode of NiMn-LDHs, reduced graphene oxide (rGO) and nickel foam (NF), i.e., NiMn-LDHs/rGO/NF, was prepared by a hydrothermal method. When [...] Read more.
The poor conductivity and instability of layered dihydroxides (LDHs) limit their widespread application in oxygen evolution reaction (OER). In this study, the composite electrode of NiMn-LDHs, reduced graphene oxide (rGO) and nickel foam (NF), i.e., NiMn-LDHs/rGO/NF, was prepared by a hydrothermal method. When subjected to oxygen evolution reaction (OER) catalytic performance in a solution of 1 M KOH, the NiMn-LDHs/rGO/NF composite catalyst exhibited an overpotential of only 140 mV at a current density of 10 mA cm−2 and a Tafel slope of 49 mV dec−1, which is not only better than the comparing RuO2/NF catalyst, but also better than most of the Mn-based and the Ni–Fe-containing bimetallic OER catalysts reported in the literature. The excellent electrocatalytic performance is ascribed to the efficient integration of ultrathin NiMn-LDH sheets, thin-layered rGO and NF, contributing significantly to the decrease in charge transfer resistance and the increase in electrochemically active surface area. Moreover, NF plays a role of current collector and a role of rigid support for the NiMn-LDHs/rGO composite, contributing extra conductivity and stability to the NiMn-LDHs/rGO/NF composite electrode. Full article
(This article belongs to the Special Issue Carbon-Based Materials as Efficient Electrocatalysts for Oxygen Evolution Reaction)
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