Article
Chemistry, Physical
Jiang Liu, Yili Kang, Mingjun Chen, Lijun You, Wangkun Cao, Xinlei Li
Summary: The influence of heat treatment on the desorption efficiency of coalbed methane was investigated. It was found that the pore structure and composition are the main factors affecting the coal adsorption potential. The adsorption potential of coal increases with temperature, but decreases at 800 degrees C. Weighted pressure was proposed to comprehensively evaluate the desorption efficiency of coal after heat treatment and determine the optimal heat treatment temperature.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Chemistry, Physical
Aika Yano, Takafumi Ishii
Summary: In this study, we enhanced the chemical stability of carbon materials by modifying the carbon edge sites with chemically stable metal oxides. We introduced aluminol to the carbon edge sites by modifying them with trimethylaluminum (TMA) and investigated its effect on the electrochemical oxidation resistance. The structural analysis showed that TMA reacts with hydroxyl groups at the edge sites and modifies them with aluminol. The investigation revealed that TMA treatment increases the oxidation resistance when the ratio of TMA-modified sites to total carbon edge sites is >= 60%.
Article
Engineering, Environmental
Cheng Zhao, Xiaomei Hu, Chengxian Liu, Dingsheng Chen, Junge Yun, Xueying Jiang, Ninghan Wei, Mingshan Li, Zhihang Chen
Summary: By hydrothermally synthesizing spherical and hierarchical ZSM-5 zeolite with organo-functionalized silica and organic additive, nanocrystalline stacking and hierarchical meso-microporous architectures were achieved. The size of nanocrystals and surface topography of ZSM-5 were influenced by the organo-functionalized silica and organic additive, allowing control of the mesoporous volumes and pore diameter. Evaluation of performance in toluene showed high adsorption ability and excellent cyclic performance due to lower steric limitations and higher diffusion rate for organic molecules. Exploration using Fourier Transform Infrared Spectroscopy and Differential Thermogravimetric Analysis directly confirmed the presence of organosilane and organic additives in the zeolitic nanocrystals, leading to the proposal of a crystallization mechanism significant for designing and synthesizing hierarchical zeolites.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2022)
Article
Chemistry, Physical
Lei Wang, Zhen Du, Luoxing Xiang, Dan Hou, Shuheng Zhu, Jianfeng Zhu, Yiyong Mai, Renchao Che
Summary: Highly ordered mesoporous carbon coated graphene composites show great potential in microwave absorption, with high absorbility and wide effective absorbing bandwidth, making them suitable for addressing electromagnetic pollution.
Article
Materials Science, Multidisciplinary
Erman Taer, Novi Yanti Effendi, Rika Taslim, Apriwandi Apriwandi
Summary: In this study, hierarchical porous activated carbon nanofiber was prepared from lemongrass leaf waste and characterized for its physical and electrochemical properties. The LG-0.7 sample exhibited the best performance with high surface area and a combination of hierarchical pores, making it suitable for porous carbon electrodes in high-performance supercapacitors.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Chemistry, Multidisciplinary
Lingting Ye, Shaobo Xi, Hao Li, Guoming Lin, Kui Xie
Summary: By growing mesoporous tungsten nitride single crystals and engineering their well-defined surface structures, the research achieved the creation of unsaturated coordination structures confined at twisted surfaces, resulting in a material with a record high areal capacitance.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Review
Biochemistry & Molecular Biology
Fangzheng Wang, Yuying Han, Xin Feng, Rui Xu, Ang Li, Tao Wang, Mingming Deng, Cheng Tong, Jing Li, Zidong Wei
Summary: This study reviews the synthesis and applications of mesoporous carbon-based materials (MCBMs) in lithium-sulfur batteries (LSBs), which have attracted attention for their ability to solve the problems of LSBs and improve performance. The systematic correlation between the structural characteristics of MCBMs and their electrochemical properties is established, providing recommendations for performance enhancement. The commercialization of high energy density secondary batteries is of great importance for carbon neutrality and meeting energy demand.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2023)
Article
Chemistry, Physical
Maximilian Goeckeler, Cornelius M. Berger, Maximilian Purcel, Ralf Bergstraesser, Arndt-Peter Schinkel, Martin Muhler
Summary: In this study, carbon black was functionalized through gas-phase oxidation using nitric acid vapor at 150 degrees C, and the decomposition mechanisms of oxygen-containing surface groups were analyzed through temperature-programmed desorption (TPD) and temperature-programmed reduction (TPR) experiments. The increase in duration of HNO3 functionalization led to an enrichment of acidic surface groups, with desorbed H2O originating from chemisorbed water bound to carboxylic acid groups and condensation reactions of carboxylic acids and phenols. Additionally, the selective reduction of phenols and carbonyls by H2 during TPR resulted in the appearance of a new CO2 evolution peak at 575 degrees C, indicating the hydrolysis of anhydrides and lactones.
APPLIED SURFACE SCIENCE
(2021)
Article
Chemistry, Multidisciplinary
Zhenjin Liang, Yuhao Peng, Huanhuan Feng, Zibo Hong, Fengqing Liu, Ruohan Yu, Yue Cao, Mingyue Xie, Yuanteng Zhang, Xing Zhang, Xianfeng Yi, Anmin Zheng, Jinsong Wu, Wei Xiao, Ferdi Schueth, Dong Gu
Summary: Hollow-structured mesoporous carbons with ultrahigh surface area, large pore volume, and heteroatom doping are synthesized using a versatile and general silanol-assisted surface-casting method. These materials exhibit remarkable electrochemical performance for lithium-ion batteries.
ADVANCED MATERIALS
(2023)
Article
Energy & Fuels
Haotian Zhu, Dicha Wu, Gaoyue Zhang, Wei Xu, Ao Wang, Kang Sun
Summary: The presence of heteroatom, specifically phosphorus, can enhance the ability of carbon materials to store lithium ions. By studying the relationship between the phosphorus species, phosphorus atom contents, and Li-storage performance of phosphorus-doped carbon, it was found that a high content of phosphorus atoms does not necessarily result in a high specific capacity. Phosphorus functional groups with a higher proportion of C-P bonds can store Li-ions more efficiently in the carbon material. Understanding how phosphorus functional groups affect the electrochemical performance of carbon materials helps in comprehending the impact of phosphorus doping on carbon anodes for lithium ion storage and contributes to the development of phosphorus-doped electrodes.
JOURNAL OF ENERGY STORAGE
(2023)
Article
Chemistry, Physical
Takafumi Ishii, Jun-ichi Ozaki
Summary: By studying the hydrogen desorption profiles of carbon materials, the spatial distribution of their edge sites can be revealed. Activated carbons, carbon blacks, and rGOs exhibit uniform distribution of edge hydrogen, while graphite, high-temperature treated carbon, and CNTs have heterogeneous distribution.
Article
Chemistry, Multidisciplinary
Jiawu Peng, Xiaoting Hong, Qiongxiang Zhou, Kwan San Hui, Bin Chen
Summary: This study presents a method for synthesizing microspherical FePO4·2H2O precursors with secondary nanostructures by the electroflocculation of low-cost iron fillers in a hot solution. The effect of precursor structure and morphology on the electrochemical performance of the synthesized LiFePO4/C was investigated. The improved performance of LiFePO4/C was attributed to the enhanced Li+ diffusion rate and the crystallinity of LiFePO4/C.
Article
Engineering, Electrical & Electronic
Luo-Jia Feng, Jia-Yi Yan, Shao-Wei Bian
Summary: This study presents a micro/mesoporous N, P, S-tridoped carbon material prepared through a one-step synthesis strategy, which exhibits outstanding electrochemical performances as a supercapacitor electrode. Furthermore, the material can be coupled with other materials to assemble a flexible asymmetric supercapacitor.
ACS APPLIED ELECTRONIC MATERIALS
(2023)
Article
Chemistry, Physical
Kue-Ho Kim, Jung Soo Lee, Hyo-Jin Ahn
Summary: Fluorine-doped mesoporous carbon (F-MAC), derived from Ecklonia cava, demonstrates high specific capacitance, excellent high-rate performance, and superior cycle stability, addressing the challenges of conventional activated carbon manufacturing process.
APPLIED SURFACE SCIENCE
(2021)
Article
Multidisciplinary Sciences
Ye Tian, Chupei Shi, Carolina Urbina Malo, Steve Kwatcho Kengdo, Jakob Heinzle, Erich Inselsbacher, Franz Ottner, Werner Borken, Kerstin Michel, Andreas Schindlbacher, Wolfgang Wanek
Summary: Long-term soil warming leads to changes in soil phosphorus pools and processes, resulting in decreased total phosphorus storage in the soil, increased sorption of recalcitrant phosphorus fractions, lower bioavailable phosphorus in the soil solution, and negative impacts on phosphorus limitation for trees and soil microbes, thus reducing the carbon sequestration potential of forests.
NATURE COMMUNICATIONS
(2023)
Article
Chemistry, Applied
Isao Ogino, Go Fukazawa, Shunsuke Kamatari, Shinichiroh Iwamura, Shin R. Mukai
JOURNAL OF ENERGY CHEMISTRY
(2018)
Article
Engineering, Chemical
Takeshi Mori, Shinichiroh Iwamura, Isao Ogino, Shin R. Mukai
SEPARATION AND PURIFICATION TECHNOLOGY
(2019)
Article
Chemistry, Physical
Kazuya Takahashi, Seiichiro Yoshida, Kasama Urkasame, Shinichiroh Iwamura, Isao Ogino, Shin R. Mukai
ADSORPTION-JOURNAL OF THE INTERNATIONAL ADSORPTION SOCIETY
(2019)
Article
Chemistry, Physical
Seiichiro Yoshida, Shinichiroh Iwamura, Isao Ogino, Shin R. Mukai
ADSORPTION-JOURNAL OF THE INTERNATIONAL ADSORPTION SOCIETY
(2019)
Article
Chemistry, Multidisciplinary
Yu Iwai, Takuya Ikka, Akira Miura, N. C. Rosero-Navarro, Shinichiroh Iwamura, Isao Ogino, Shin R. Mukai, Kiyoharu Tadanaga
Article
Chemistry, Physical
Wei Liu, Takashi Yanase, Nobuhiro Iwasa, Hitoshi Koizumi, Shin Mukai, Shinichiro Iwamura, Taro Nagahama, Toshihiro Shimada
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2020)
Article
Chemistry, Physical
Wei Liu, Takashi Yanase, Nobuhiro Iwasa, Shin Mukai, Shinichiro Iwamura, Taro Nagahama, Toshihiro Shimada
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2020)
Article
Chemistry, Physical
Keita Ushijima, Shinichiroh Iwamura, Shin R. Mukai
ACS APPLIED ENERGY MATERIALS
(2020)
Article
Chemistry, Physical
Jittraporn Saengkaew, Takashi Kameda, Manai Ono, Emiko Mizuki, Shintaroh Nagaishi, Shinichiroh Iwamura, Shin R. Mukai, Shoichi Matsuda
Summary: Lithium-oxygen batteries (LOBs) are a promising option for rechargeable batteries with high theoretical energy densities. The optimization of the carbon-based positive electrode is crucial for the practical implementation of LOB technologies. In this study, carbon gel-based self-standing membranes were prepared as positive electrodes and their performances in LOBs were evaluated under lean-electrolyte, high-areal-capacity conditions. The results indicated that nanometer-sized pores had limited effects on cycle performance but contributed to enhancing discharge capacity; macro-sized pores had a positive effect on enhancing discharge capacity; crystallinity and surface functional groups influenced discharge potential and cycle life. This study highlights the importance of controlling the physicochemical properties of porous carbon-based positive electrodes for achieving LOBs with high energy densities and extended cycle lives.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Chemistry, Physical
Shintaroh Nagaishi, Shinichiroh Iwamura, Takafumi Ishii, Shin R. Mukai
Summary: Controlling the characteristics of Li2O2 deposition during discharging in lithium-air batteries (LABs) can reduce the overpotential required for charging, therefore improving the cycle performance of LABs. The presence of functional groups in the cathode carbon affects the deposition of Li2O2 and the performance of LABs. By increasing the number of oxygen-containing functional groups (OCFGs) in carbon gels, the deposition of Li2O2 within the mesopores of carbon particles can be increased, leading to a reduction in charging overpotential. However, a large number of OCFGs can cause side reactions that deteriorate cycle performance, which can be mitigated by heat treatment.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Chemistry, Physical
Shintaroh Nagaishi, Shinichiroh Iwamura, Takafumi Ishii, Shin R. Mukai
Summary: In this study, the effects of functional groups in the cathode carbon on the characteristics of Li2O2 and the performance of lithium-air batteries were investigated. It was found that increasing the number of oxygen-containing functional groups (OCFGs) through acid treatment can increase the deposition of Li2O2 within the mesopores of carbon particles, leading to a reduction in charging overpotential. However, CGs with a large number of OCFGs tend to undergo side reactions that deteriorate cycle performance, which can be mitigated by removing carboxyl groups through heat treatment.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Materials Science, Multidisciplinary
Shinichiroh Iwamura, Ryotaro Umezu, Kenta Onishi, Shin R. Mukai
Summary: This study investigated the electrical properties of MnO2/C composites prepared from activated carbon gels with different pore sizes using cyclic voltammetry. The results showed that mesoporous carbons with a pore size of around 20 nm formed a composite with relatively low capacitance and poor rate performance, while macro-porous carbons with a pore size of around 60 nm increased the MnO2 redox capacitance as well as the capacitance and rate performance of the entire material. These findings can be applied in the industrial production of MnO2/C composites for supercapacitor electrodes using commercially available porous carbons.
KOREAN JOURNAL OF MATERIALS RESEARCH
(2021)
Article
Chemistry, Multidisciplinary
Shinichiroh Iwamura, Shota Motohashi, Shin R. Mukai
Article
Materials Science, Multidisciplinary
Shinichiroh Iwamura, Kazuki Fujita, Ryo Iwashiro, Shin R. Mukai
MATERIALS TODAY COMMUNICATIONS
(2018)