Green Catalysis in Nanomaterials—Photocatalysis and Electrocatalysis

A special issue of Nanomaterials (ISSN 2079-4991). This special issue belongs to the section "Energy and Catalysis".

Deadline for manuscript submissions: 20 June 2024 | Viewed by 3853

Special Issue Editors


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Guest Editor
College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, China
Interests: green catalysis

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Guest Editor
College of Electronic and Optical Engineering & College of Flexible Electronics (Future Technology), Nanjing University of Posts and Telecommunications, Nanjing, China
Interests: 2D energy materials for hydrogen evolution

Special Issue Information

Dear Colleagues,

Energy shortage and environmental pollution have become two serious problems in the process of sustainable development. Developing green catalysis in nanomaterials with distinctive properties is an effective method of relieving environmental pressure. The current Research Topic aims to cover: (1) developing new methods for the synthesis of functional inorganic and inorganic–organic nanomaterials with novel structures; (2) advanced novel functional materials such as low-dimensional hybrid and/or multi-junction assemblies for utilizing renewable energy resources, energy conversion, hydrogen and green fuel production; and (3) catalytic remediation of pollutants in wastewater using advanced oxidation processes (e.g., photocatalysis, photo-electrocatalysis, sonocatalysis and electrocatalysis) and heterogeneous catalysis strategies.

The present Special Issue of Nanomaterials aims to present the current state of the art regarding Green Catalysis in Nanomaterials—Photocatalysis and Electrocatalysis. In the present Special Issue, we have invited contributions from leading groups in the field with the aim of providing a balanced view of the current state of the art in this discipline.

Prof. Dr. Chengbin Liu
Prof. Dr. Longlu Wang
Guest Editors

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Keywords

  • nanomaterials
  • photocatalysis
  • electrocatalysis
  • energy conversion
  • advanced oxidation processes

Published Papers (4 papers)

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Research

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17 pages, 4145 KiB  
Article
MOF Template-Derived Carbon Shell-Embedded CoP Hierarchical Nanosheet as Bifunctional Catalyst for Overall Water Splitting
by Mei-Jun Liu, Fu-Hao Yang, Ji-Cheng Mei, Xu Guo, Hua-Yang Wang, Meng-Yao He, Yu-Ang Yao, Hai-Feng Zhang and Cheng-Bin Liu
Nanomaterials 2023, 13(17), 2421; https://doi.org/10.3390/nano13172421 - 25 Aug 2023
Viewed by 815
Abstract
The design of earth-abundant and highly efficient bifunctional electrocatalysts for hydrogen evolution and oxygen evolution reactions (HER/OER) is crucial for hydrogen production through overall water splitting. Herein, we report a novel nanostructure consisting of vertically oriented CoP hierarchical nanosheet arrays with in situ-assembled [...] Read more.
The design of earth-abundant and highly efficient bifunctional electrocatalysts for hydrogen evolution and oxygen evolution reactions (HER/OER) is crucial for hydrogen production through overall water splitting. Herein, we report a novel nanostructure consisting of vertically oriented CoP hierarchical nanosheet arrays with in situ-assembled carbon skeletons on a Ti foil electrode. The novel Zeolitic Imidazolate Framework-67 (ZIF-67) template-derived hierarchical nanosheet architecture effectively improved electrical conductivity, facilitated electrolyte transport, and increased the exposure of the active sites. The obtained bifunctional hybrid exhibited a low overpotential of 72 mV at 10 mA cm−2 and a small Tafel slope of 65 mV dec−1 for HER, and an improved overpotential of 329 mV and a Tafel slope of 107 mV dec−1 for OER. Furthermore, the assembled C@CoP||C@CoP electrolyzer showed excellent overall water splitting performance (1.63 V) at a current density of 10 mA cm−2 and superior durability. This work provides a structure engineering strategy for metal–organic framework (MOF) template-derived hybrids with outstanding electrocatalytic performance. Full article
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19 pages, 6829 KiB  
Article
Efficient Dual-Function Catalyst: Palladium–Copper Nanoparticles Immobilized on Co-Cr LDH for Seamless Aerobic Oxidation of Benzyl Alcohol and Nitrobenzene Reduction
by Linah A. Alzarea, Mosaed S. Alhumaimess, Ibrahim Hotan Alsohaimi, Hassan M. A. Hassan, M. R. El-Aassar, Amr A. Essawy and Haitham Kalil
Nanomaterials 2023, 13(13), 1956; https://doi.org/10.3390/nano13131956 - 27 Jun 2023
Cited by 3 | Viewed by 1135
Abstract
Layered double hydroxides (LDHs) present exciting possibilities across various industries, ranging from catalytic applications to water remediation. By immobilizing nanoparticles, LDHs’ characteristics and functionality can be enhanced, allowing for synergetic interactions that further expand their potential uses. A simple chemical method was developed [...] Read more.
Layered double hydroxides (LDHs) present exciting possibilities across various industries, ranging from catalytic applications to water remediation. By immobilizing nanoparticles, LDHs’ characteristics and functionality can be enhanced, allowing for synergetic interactions that further expand their potential uses. A simple chemical method was developed to produce well-dispersed Pd-Cu NPs on a Co-Cr LDH support using a combination of in situ coprecipitation/hydrothermal and sol-immobilization techniques. The Pd-Cu@Co-Cr LDH catalysts was obtained, showing its catalytic activity in promoting the aerobic oxidation of alcohols and enabling the reduction of nitro-compounds through NaBH4 mediation. The physicochemical properties of the prepared catalyst were comprehensively investigated utilizing a range of analytical techniques, comprising FTIR, XRD, XPS, TGA, nitrogen adsorption isotherm, FESEM, and HRTEM-EDX. The findings showed the significance of immobilizing the bimetallic Pd-Cu nanoparticles on the Co-Cr LDH via an exceptional performance in the aerobic oxidation of benzyl alcohol (16% conversion, 99.9% selectivity to benzaldehyde) and the reduction of nitrobenzene (98.2% conversion, rate constant of 0.0921 min−1). The improved catalytic efficacy in benzyl alcohol oxidation and nitrobenzene reduction on the Pd-Cu@Co-Cr LDH catalyst is attributed to the uniform distribution and small size of the Pd-Cu NPs as active sites on the Co-Cr LDH surface. The prepared catalyst demonstrated exceptional stability during repeated runs. This study paves the way for multiple opportunities in tailoring, producing, and precisely controlling catalysts for various organic transformation reactions. Full article
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Review

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14 pages, 3737 KiB  
Review
Recent Advances in Carbon-Based Single-Atom Catalysts for Electrochemical Oxygen Reduction to Hydrogen Peroxide in Acidic Media
by Hao Yin, Ronglan Pan, Manman Zou, Xin Ge, Changxuan Shi, Jili Yuan, Caijuan Huang and Haibo Xie
Nanomaterials 2024, 14(10), 835; https://doi.org/10.3390/nano14100835 - 9 May 2024
Viewed by 586
Abstract
Electrochemical oxygen reduction reaction (ORR) via the 2e pathway in an acidic media shows great techno-economic potential for the production of hydrogen peroxide. Currently, carbon-based single-atom catalysts (C-SACs) have attracted extensive attention due to their tunable electronic structures, low cost, and sufficient [...] Read more.
Electrochemical oxygen reduction reaction (ORR) via the 2e pathway in an acidic media shows great techno-economic potential for the production of hydrogen peroxide. Currently, carbon-based single-atom catalysts (C-SACs) have attracted extensive attention due to their tunable electronic structures, low cost, and sufficient stability in acidic media. This review summarizes recent advances in metal centers and their coordination environment in C-SACs for 2e-ORR. Firstly, the reaction mechanism of 2e-ORR on the active sites of C-SACs is systematically presented. Secondly, the structural regulation strategies for the active sites of 2e-ORR are further summarized, including the metal active center, its species and configurations of nitrogen coordination or heteroatom coordination, and their near functional groups or substitute groups, which would provide available and proper ideas for developing superior acidic 2e-ORR electrocatalysts of C-SACs. Finally, we propose the current challenges and future opportunities regarding the acidic 2e-ORR pathway on C-SACs, which will eventually accelerate the development of the distributed H2O2 electrosynthesis process. Full article
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14 pages, 4357 KiB  
Review
Revisited Catalytic Hydrogen Evolution Reaction Mechanism of MoS2
by Yuhao He, Xiangpeng Chen, Yunchao Lei, Yongqi Liu and Longlu Wang
Nanomaterials 2023, 13(18), 2522; https://doi.org/10.3390/nano13182522 - 8 Sep 2023
Cited by 1 | Viewed by 929
Abstract
MoS2 has long been considered a promising catalyst for hydrogen production. At present, there are many strategies to further improve its catalytic performance, such as edge engineering, defect engineering, phase engineering, and so on. However, at present, there is still a great [...] Read more.
MoS2 has long been considered a promising catalyst for hydrogen production. At present, there are many strategies to further improve its catalytic performance, such as edge engineering, defect engineering, phase engineering, and so on. However, at present, there is still a great deal of controversy about the mechanism of MoS2 catalytic hydrogen production. For example, it is generally believed that the base plane of MoS2 is inert; however, it has been reported that the inert base plane can undergo a transient phase transition in the catalytic process to play the catalytic role, which is contrary to the common understanding that the catalytic activity only occurs at the edge. Therefore, it is necessary to further understand the mechanism of MoS2 catalytic hydrogen production. In this article, we summarized the latest research progress on the catalytic hydrogen production of MoS2, which is of great significance for revisiting the mechanism of MoS2 catalytic hydrogen production. Full article
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