Article
Chemistry, Physical
Jonas Mart Linge, Heiki Erikson, Peeter Ritslaid, Arvo Kikas, Vambola Kisand, Jaan Aruvali, Jekaterina Kozlova, Aile Tamm, Ave Sarapuu, Kaido Tammeveski
Summary: In this study, MnO2 and multiwalled carbon nanotube (MWCNT) composites decorated with silver were prepared to evaluate their electrocatalytic activity towards the oxygen reduction reaction (ORR). The physicochemical characterisation was done using scanning electron microscopy, energy-dispersive X-ray spectroscopy, and X-ray photoelectron spectroscopy. The electrochemical studies revealed that the activity and stability of the composite catalysts depend on the substrate material and the thickness of the silver layer.
Article
Materials Science, Multidisciplinary
Hussein O. Badr, Kiana Montazeri, Tarek El-Melegy, Varun Natu, Michael Carey, Ramchandra Gawas, Phu Phan, Qian Qian, Christopher Y. Li, Ulf Wiedwald, Michael Farle, Erika Colin-Ulloa, Lyubov V. Titova, Marc Currie, Thierry Ouisse, Maxime Barbier, Andrei Rogalev, Fabrice Wilhelm, Marcus Hans, Jochen M. Schneider, Christopher Tandoc, Young-Jie Hu, Joshua Snyder, Michel W. Barsoum
Summary: Researchers have successfully synthesized high-quality two-dimensional flakes using a new method that is simple and cost-effective. By converting water-insoluble Mn-bearing precursors into birnesite-based materials, they have achieved remarkable crystallinity for the synthesized flakes.
Article
Acoustics
Bhaskar J. Choudhury, Vijayanand S. Moholkar
Summary: In this study, a ternary nanocomposite with commercial-level mass loading was developed for supercapacitors, demonstrating high capacitive performance and cycle life. The nanocomposite was synthesized using a facile ultrasound-assisted one-pot method, resulting in a porous ternary structure with efficient ion diffusion channels and high electrochemically active surface area.
ULTRASONICS SONOCHEMISTRY
(2022)
Article
Engineering, Environmental
Hemam Rachna Devi, Omeshwari Yadorao Bisen, Zhong Chen, Karuna Kar Nanda
Summary: The rational design of bifunctional electrocatalyst is important for sustainable energy storage and conversion devices. In this study, a unique architecture of carbon nanotubes supported on an oxide template was designed. This design showed enhanced water oxidation performance and oxygen reduction reaction activity.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Chemistry, Physical
He Wang, Chenhong Liu, Xiaoli Yang, Jiali Gu, Mengyuan Niu, Lin Yang, Zhengyu Bai
Summary: In this study, a CoFe2O4-NC electrocatalyst with excellent ORR activity and long-term stability was synthesized through the incorporation of CoFe2O4 nanoparticles in N-doped carbon nanotubes. The obtained electrocatalyst outperformed previously reported catalysts with a higher half-wave potential and continuous cycling. This work opens up a new direction for the development of low-cost and efficient ORR electrocatalysts.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Chemistry, Multidisciplinary
Sai Che, Na Ta, Fan Yang, Xingru Yan, Hongchen Liu, Neng Chen, Siyuan Sun, Chaonan Wang, Bo Jiang, Yang Sun, Ying Wang, Yongfeng Li
Summary: This study reports a novel synthesis method of heterostructure CoSe/Co-N-C material, where uniform CoSe nanoparticles are supported on carbon backbones. CoSe/Co-N-C material demonstrates superior hydrogen evolution reaction (HER) activities and stabilities under both acidic and alkaline conditions, revealing its great potential in practical hydrogen mass production.
MATERIALS CHEMISTRY FRONTIERS
(2022)
Article
Chemistry, Multidisciplinary
Xialiang Li, Haonan Qin, Jinxiu Han, Xiaotong Jin, Yuhan Xu, Shujiao Yang, Wei Zhang, Rui Cao
Summary: This study presents a one-pot three-in-one strategy to immobilize Co corroles on carbon nanotubes (CNTs) for oxygen electrocatalysis. By using pyridine-functionalized CNTs as the platforms, Co corroles can be grabbed through axial pyridine ligation. This strategy combines axial ligand effect, electron transfer effect, and chemical bond effect to regulate electrocatalysis. The resulting hybrid materials exhibit high efficiency for oxygen electrocatalysis and comparable performance to Pt/Ir-based batteries. The electrocatalytic features of the molecule-engineered materials can be selectively regulated by using different pyridines. This work is of significant importance for the immobilization of catalyst molecules on CNTs for electrocatalysis.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Chemistry, Physical
Eirini Zagoraiou, Fotios Paloukis, Maria K. Daletou
Summary: This study utilized oxpyMWCNT functionalized with pyridine groups as a support to develop Pt supported catalysts, examining the impact of different metal loadings. It was found that using this support allowed for small particle size and homogeneous dispersion, affecting the correlation between properties and electrocatalytic activity.
APPLIED SURFACE SCIENCE
(2021)
Article
Chemistry, Inorganic & Nuclear
Michael A. Stevens, Li Feng Lim, Le Nhan Pham, Nicholas Cox, Michelle L. Coote, Annie L. Colebatch
Summary: The reaction between the ligand 2,7-bis(6-methyl-2-pyridyl)-1,8-naphthyridine (MeL) and the MnI and MnII precursors resulted in the formation of monometallic and bimetallic manganese complexes. The EPR results showed the magnetic properties of one of the complexes.
DALTON TRANSACTIONS
(2023)
Article
Environmental Sciences
J. X. Flores-Lasluisa, D. Salinas-Torres, M. Lopez-Ramon, C. Moreno-Castilla, M. A. Alvarez, E. Morallon, D. Cazorla-Amoros
Summary: The study showed that the calcination temperature of the synthesized MnFe2O4 solid nanospheres significantly influenced their electrocatalytic properties, while the presence of manganese species played a key role in the oxygen reduction reaction activity. Among the tested materials, MSN200/CB and MSN350/CB showed the best electrochemical performances and outstanding stability.
ENVIRONMENTAL RESEARCH
(2022)
Article
Chemistry, Multidisciplinary
P. Muthu Pandian, A. Pandurangan
Summary: The article introduces the synthesis of boron and nitrogen co-doped reduced graphene material (BNUG) and its application in solid-state supercapacitors. BNUG exhibits high specific capacitance and cycling stability, and the fabricated supercapacitors show high energy density and efficiency in different electrolytes.
NEW JOURNAL OF CHEMISTRY
(2021)
Article
Engineering, Chemical
Zexiang Wang, Yufei Han, Weiliu Fan, Yuxia Wang, Lihui Huang
Summary: The new MnO2/carbon@carbon nanotubes (MnO2/C@CNT) shell-core nanohybrid synthesized in this study showed enhanced degradation of tetracycline (TC) with MnO2/C@CNT-PMS systems exhibiting the best TC degradation efficiency at 85.6% in 10 minutes. The stripping and insertion of nanocarbon during synthesis enhanced electron transfer and conversion of Mn and O species, with SO center dot-4 identified as the main active specie during the catalytic reaction. LC-MS analysis was used to propose reasonable degradation pathways of TC.
SEPARATION AND PURIFICATION TECHNOLOGY
(2022)
Article
Chemistry, Applied
Yang Li, Kuanda Xu, Qi Zhang, Zhi Zheng, Shunning Li, Qinghe Zhao, Can Li, Cheng Dong, Zongwei Mei, Feng Pan, Shixue Dou
Summary: Rechargeable zinc-air batteries have high theoretical energy density but suffer from high polarization and low energy efficiency. A noble-metal-free FeNxC electrocatalyst was developed to enhance oxygen reduction reaction kinetics, leading to improved performance in charge-discharge voltage gap, peak power density, and long-term durability. This work provides significant support for the practical application of zinc-air batteries in the future.
JOURNAL OF ENERGY CHEMISTRY
(2022)
Article
Chemistry, Multidisciplinary
Oscar R. Andrade, Veronica Rodriguez, Rafael Camarillo, Fabiola Martinez, Carlos Jimenez, Jesusa Rincon
Summary: The effect of carbon support on the activity and selectivity of N-doped TiO2 nanoparticles was analyzed in this study. The results showed that the photocatalytic performance of the prepared catalysts was enhanced due to the synergistic effect of N doping and carbon support.
Article
Chemistry, Physical
V. V. Zefirov, D. Gusak, V. E. Sizov, I. Elmanovich, M. S. Kondratenko
Summary: A novel method for the direct synthesis of MnO2 on multiwalled carbon nanotubes through thermal decomposition and oxidation in supercritical CO2 is proposed. The resulting composite materials exhibit improved mass activity in the oxygen reduction reaction (ORR) by controlling oxide particle dimensions and specific surface area through precursor concentration adjustment. Analysis of phase composition, morphology, and electrochemical performance in alkaline electrolyte was conducted to study the characteristics of the composites.
JOURNAL OF SUPERCRITICAL FLUIDS
(2022)
