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Catalysts
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Hierarchically Catalysts for Water Splitting and Selective Hydrogenation
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Hierarchically Catalysts for Water Splitting and Selective Hydrogenation

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

Deadline for manuscript submissions: 31 August 2024 | Viewed by 1872

Special Issue Editors

Prof. Dr. Guangjie Shao

E-Mail Website
Guest Editor
Hebei Key Laboratory of Applied Chemistry, College of Environmental and Chemical Engineering, Yanshan University, Qinhuangdao 066004, China
Interests: supercapacitors; metal-ion batteries;metal–sulfur batteries; electrocatalysis; hypergravity electrodeposition techniques; nanostructured materials
Dr. Ailing Song

E-Mail Website
Guest Editor
Hebei Key Laboratory of Applied Chemistry, College of Environmental and Chemical Engineering, Yanshan University, Qinhuangdao 066004, China
Interests: electrocatalysis; zinc-air batteries; water-splitting; metal-ion batteries; metal-sulfur batteries

Special Issue Information

Dear Colleagues,

The need for sustainable and renewable energy production, storage, and conversion technologies has never been more pressing than now. To address the energy and environmental crisis, electrochemical water splitting has emerged as a promising method for producing green hydrogen. Similarly, industrial products (such as cyclohexene) are very important chemical intermediates. They are widely used in the production of cyclohexanol, cyclohexanone, and other chemical products, and also constitute the main production cost of enterprises. Selective hydrogenation is an excellent method used to prepare these products in large quantities. These approaches require concerted efforts to design catalytic materials that are highly active, cost-effective, and have long-term stability. Heterostructures, commonly defined as composites consisting of interfaces in different components, have demonstrated exceptional catalytic performance in electrocatalysis and industrial catalysis, particularly in hydrogen evolution reactions (HERs), oxygen evolution reactions (OERs), and benzene selective hydrogenation (BSH). Heterostructured materials often show improved charge transfer because of the diverse arrangements of energy bands in different components and have recieved significant attention because of the fascinating synergistic effects of the interactive coupling between heterogeneous zones, resulting in high activity and long-term stability.

Prof. Dr. Guangjie Shao
Dr. Ailing Song
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

  • heterostructures
  • electrocatalysis
  • hydrogen evolution reaction
  • oxygen evolution reaction
  • benzene selective hydrogenation
  • water splitting

Published Papers (3 papers)

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Research

12 pages, 2402 KiB  
Article
One-Step Synthesis of High-Efficiency Oxygen Evolution Reaction Catalyst FeSx(Y/MB) with High Temperature Resistance and Strong Alkali
by Jing Wang, Lingling Feng, Zikang Zhao, Yan Wang, Ying Zhang, Shan Song, Shengwei Sun, Junshuang Zhou and Faming Gao
Catalysts 2024, 14(5), 324; https://doi.org/10.3390/catal14050324 - 16 May 2024
Viewed by 253
Abstract
Given the energy crisis and escalating environmental pollution, the imperative for developing clean new energy is evident. Hydrogen has garnered significant attention owing to its clean properties, high energy density, and ease of storage and transportation. This study synthesized four types of catalysts—FeS(DI/MB), [...] Read more.
Given the energy crisis and escalating environmental pollution, the imperative for developing clean new energy is evident. Hydrogen has garnered significant attention owing to its clean properties, high energy density, and ease of storage and transportation. This study synthesized four types of catalysts—FeS(DI/MB), FeS(ET/MB), Fe(DI/MB), and Fe(ET/MB)—using two distinct solution systems: DI/MB and ET/MB. The FeS(DI/MB) catalyst, synthesized using the layered solution system (DI/MB), demonstrates a uniformly distributed and dense nanosheet structure, exhibiting excellent resistance to strong bases and superior catalytic properties. The FeS(DI/MB) electrode showed OER overpotentials of 460 mV and 318 mV in 1 M and 6 M, respectively, at current densities of up to 500 mA cm−2. Under industrial electrolysis test conditions, the FeS(DI/MB) electrode required only 262 mV to achieve a current density of 500 mA cm−2, operating in a high-temperature, strong alkaline environment of 6 M at 60 °C. Furthermore, the FeS(DI/MB) electrode exhibited excellent OER catalytic activity and stability, as evidenced by a 60 h stability test These findings provide valuable insights into the preparation of iron nickel sulfide-based catalysts, and further in-depth and comprehensive exploration is anticipated to yield the excellent catalytic performance of these catalysts in the realm of electrolytic water hydrogen production. Full article
(This article belongs to the Special Issue Hierarchically Catalysts for Water Splitting and Selective Hydrogenation)
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14 pages, 7462 KiB  
Article
Strong and Hierarchical Ni(OH)2/Ni/rGO Composites as Multifunctional Catalysts for Excellent Water Splitting
by Lixin Wang, Ailing Song, Yue Lu, Manman Duanmu, Zhipeng Ma, Xiujuan Qin and Guangjie Shao
Catalysts 2024, 14(5), 309; https://doi.org/10.3390/catal14050309 - 7 May 2024
Viewed by 301
Abstract
The lack of efficient and non-precious metal catalysts poses a challenge for electrochemical water splitting in hydrogen and oxygen evolution reactions. Here, we report on the preparation of growing Ni(OH)2 nanosheets in situ on a Ni and graphene hybrid using supergravity electrodeposition [...] Read more.
The lack of efficient and non-precious metal catalysts poses a challenge for electrochemical water splitting in hydrogen and oxygen evolution reactions. Here, we report on the preparation of growing Ni(OH)2 nanosheets in situ on a Ni and graphene hybrid using supergravity electrodeposition and the hydrothermal method. The obtained catalyst displays outstanding performance with small overpotentials of 161.7 and 41 mV to acquire current densities of 100 and 10 mA cm−2 on hydrogen evolution reaction, overpotentials of 407 and 331 mV to afford 100 and 50 mA cm−2 on oxygen evolution reaction, and 10 mA·cm−2 at a cell voltage of 1.43 V for water splitting in 1 M KOH. The electrochemical activity of the catalyst is higher than most of the earth-abundant materials reported to date, which is mainly due to its special hierarchical structure, large surface area, and good electrical conductivity. This study provides new tactics for enhancing the catalytic performance of water electrolysis. Full article
(This article belongs to the Special Issue Hierarchically Catalysts for Water Splitting and Selective Hydrogenation)
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Graphical abstract

13 pages, 2528 KiB  
Article
Ru-Loaded Biphasic TiO2 Nanosheet-Tubes Enriched with Ti3+ Defects and Directionally Deficient Electrons as Highly Efficient Catalysts in Benzene Selective Hydrogenation
by Shuo Wang, Xianrui Chen, Shuangsheng Xiong, Xiaoting Zhang, Li Hou, Qian Zhang, Yatao Wang and Faming Gao
Catalysts 2024, 14(1), 31; https://doi.org/10.3390/catal14010031 - 29 Dec 2023
Viewed by 980
Abstract
Crystalline phase engineering is a prominent strategy for synergistically optimizing the surface–body phases of a catalyst. In this work, TiO2 nanosheets assembled into nanotubes (TNSTs) with two phases, anatase and rutile, were firstly synthesized via crystal engineering by simple thermal annealing. These [...] Read more.
Crystalline phase engineering is a prominent strategy for synergistically optimizing the surface–body phases of a catalyst. In this work, TiO2 nanosheets assembled into nanotubes (TNSTs) with two phases, anatase and rutile, were firstly synthesized via crystal engineering by simple thermal annealing. These were subsequently loaded with Ru nanoparticles, with a mean size of 5.0 nm, to create the efficient benzene hydrogenation catalyst Ru/TNSTs. The well-designed nanosheet-tube structure boasts a large specific surface area and excellent transmission channels, which effectively prevents the agglomeration and deactivation of loaded Ru nanoparticles, as well as promoting the internal diffusion in the reaction process of benzene hydrogenation to cyclohexene. Furthermore, titanium dioxide nanosheet-tubes contain numerous Ti3+ defects, which not only improves the overall conversion rate of cyclohexene but also enhances the suppression of cyclohexene adsorption. Most importantly, the titanium dioxide with its two-phase composition of 75 wt% anatase and 25 wt% rutile increases the ratio of electron deficiencies of Ru and promotes cyclohexene desorption. These synergistic properties enhance the selectivity and efficiency of the Ru/TNSTs catalysts, resulting in excellent performance in the hydrogenation of benzene to cyclohexene. In particular, the Ru/TNSTs-4 catalyst (annealed for 4 h), under the specific conditions of 140 °C temperature and 5 MPa hydrogen pressure for the hydrogenation process, achieves a 95% initial selectivity and 51% yield of cyclohexene in the reaction, outperforming most supported Ru-based catalysts. This work may provide new perspectives for designing efficient benzene hydrogenation catalysts via crystalline phase engineering. Full article
(This article belongs to the Special Issue Hierarchically Catalysts for Water Splitting and Selective Hydrogenation)
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