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Emerging Nanomaterials for New Energy Applications

A special issue of International Journal of Molecular Sciences (ISSN 1422-0067). This special issue belongs to the section "Molecular Nanoscience".

Deadline for manuscript submissions: 30 August 2024 | Viewed by 1552

Special Issue Editors


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Guest Editor
Low-Carbon Technology & Chemical Reaction Engineering Lab, College of Chemical Engineering, Sichuan University, Chengdu 610065, China
Interests: nano environmental materials; adsorption; CO2 capture; supercapacitor; supwetting surfaces for oil/water separation
Special Issues, Collections and Topics in MDPI journals
Low-Carbon Technology & Chemical Reaction Engineering Lab, College of Chemical Engineering, Sichuan University, Chengdu 610065, China
Interests: applied chemistry

Special Issue Information

Dear Colleagues,

Nanoarchitecture design significantly influences various energy and environmental domains, spanning from rechargeable batteries, flow batteries, supercapacitors, microelectronics, chemical sensors, to electrocatalytic cathodes/anodes. This novel discipline delves into how structure and surface chemistry impact charge transfer, molecular transport, and ion diffusion. Exploring structure–performance connections further promotes the future development of cutting-edge functional materials with exceptional attributes.

This Special Issue focuses on the molecular aspects of preparing and enhancing nanomaterials to improve charge transfer and interactions with substances and electronics. Moreover, it seeks to offer in-depth insights into the intricate interplay of structure and electrochemical performance, fostering an extensive comprehension of molecular-scale electronic/ionic transport mechanisms. These endeavors collectively drive the rapid progress of nanomaterials’ applications.

Prof. Dr. Shaojun Yuan
Dr. Yuan Wang
Guest Editors

Manuscript Submission Information

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Published Papers (2 papers)

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15 pages, 2759 KiB  
Article
Nitrogen-Doped Porous Carbons Derived from Peanut Shells as Efficient Electrodes for High-Performance Supercapacitors
by Shibo Liu, Qishan Zhang, Jiani Liu, Jiarui Li, Wenjia Liu, Yuan Wang and Shaojun Yuan
Int. J. Mol. Sci. 2024, 25(14), 7583; https://doi.org/10.3390/ijms25147583 - 10 Jul 2024
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Abstract
The doping of porous carbon materials with nitrogen is an effective approach to enhance the electrochemical performance of electrode materials. In this study, nitrogen-doped porous carbon derived from peanut shells was prepared as an electrode for supercapacitors. Melamine, urea, urea phosphate, and ammonium [...] Read more.
The doping of porous carbon materials with nitrogen is an effective approach to enhance the electrochemical performance of electrode materials. In this study, nitrogen-doped porous carbon derived from peanut shells was prepared as an electrode for supercapacitors. Melamine, urea, urea phosphate, and ammonium dihydrogen phosphate were employed as different nitrogen dopants. The optimized electrode material PA-1-1 prepared by peanut shells, with ammonium dihydrogen phosphate as a nitrogen dopant, exhibited a N content of 3.11% and a specific surface area of 602.7 m2/g. In 6 M KOH, the PA-1-1 electrode delivered a high specific capacitance of 208.3 F/g at a current density of 1 A/g. Furthermore, the PA-1-1 electrode demonstrated an excellent rate performance with a specific capacitance of 170.0 F/g (retention rate of 81.6%) maintained at 20 A/g. It delivered a capacitance of PA-1-1 with a specific capacitance retention of 98.8% at 20 A/g after 5000 cycles, indicating excellent cycling stability. The PA-1-1//PA-1-1 symmetric supercapacitor exhibited an energy density of 17.7 Wh/kg at a power density of 2467.0 W/kg. This work not only presents attractive N-doped porous carbon materials for supercapacitors but also offers a novel insight into the rational design of biochar carbon derived from waste peelings. Full article
(This article belongs to the Special Issue Emerging Nanomaterials for New Energy Applications)
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14 pages, 3496 KiB  
Article
Synergy of Oxygen Vacancy and Surface Modulation Endows Hollow Hydrangea-like MnCo2O4.5 with Enhanced Capacitive Performance
by Gaofeng Li, Yanyan Li, Pengfei Wang, Lingling Chen, Longfei Li, Chen Bao, Jianfei Tu and Dianbo Ruan
Int. J. Mol. Sci. 2024, 25(10), 5075; https://doi.org/10.3390/ijms25105075 - 7 May 2024
Viewed by 517
Abstract
Surface chemistry and bulk structure jointly play crucial roles in achieving high-performance supercapacitors. Here, the synergistic effect of surface chemistry properties (vacancy and phosphorization) and structure-derived properties (hollow hydrangea-like structure) on energy storage is explored by the surface treatment and architecture design of [...] Read more.
Surface chemistry and bulk structure jointly play crucial roles in achieving high-performance supercapacitors. Here, the synergistic effect of surface chemistry properties (vacancy and phosphorization) and structure-derived properties (hollow hydrangea-like structure) on energy storage is explored by the surface treatment and architecture design of the nanostructures. The theoretical calculations and experiments prove that surface chemistry modulation is capable of improving electronic conductivity and electrolyte wettability. The structural engineering of both hollow and nanosheets produces a high specific surface area and an abundant pore structure, which is favorable in exposing more active sites and shortens the ion diffusion distance. Benefiting from its admirable physicochemical properties, the surface phosphorylated MnCo2O4.5 hollow hydrangea-like structure (P-MnCoO) delivers a high capacitance of 425 F g−1 at 1 A g−1, a superior capability rate of 63.9%, capacitance retention at 10 A g−1, and extremely long cyclic stability (91.1% after 10,000 cycles). The fabricated P-MnCoO/AC asymmetric supercapacitor achieved superior energy and power density. This work opens a new avenue to further improve the electrochemical performance of metal oxides for supercapacitors. Full article
(This article belongs to the Special Issue Emerging Nanomaterials for New Energy Applications)
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