Article
Chemistry, Physical
Javier Quilez-Bermejo, Emilia Morallon, Diego Cazorla-Amoros
Summary: This study investigates the deactivation mechanism of N-doped carbon materials in the oxygen reduction reaction (ORR) through experiments and computational modeling. It reveals that in both acidic and alkaline environments, graphitic-type nitrogen species deactivate through oxidation and tautomerization reactions, resulting in the formation of N-C-O-type groups, which affect the catalytic activity.
Article
Engineering, Environmental
Hang Yu, Yuhong Luo, Changcheng Wu, Aizhong Jia, Yanji Wang, Lanlan Wu, Jingde Li
Summary: This study proposes a high-performance electrocatalyst for oxygen reduction reaction (ORR) using a conductive oxygen-deficient tungsten oxynitride framework. The catalyst, composed of highly dispersed cobalt nanoclusters loaded on a three-dimensionally ordered macroporous structure, demonstrates excellent catalytic activity and durability.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Chemistry, Physical
Julen Munarriz, Zisheng Zhang, Philippe Sautet, Anastassia N. Alexandrova
Summary: In this study, the structure and dynamics of subnano Ptn clusters deposited on electrified graphite under electrochemical conditions were elucidated using a combination of global optimization and electronic Grand Canonical DFT. The results showed that these clusters exist as statistical ensembles of multiple states with fluctuating characteristics, which are greatly influenced by the applied potential, electrolyte, and adsorbate coverage.
Article
Chemistry, Physical
Julen Munarriz, Zisheng Zhang, Philippe Sautet, Anastassia N. Alexandrova
Summary: The oxygen reduction reaction (ORR) is crucial for renewable energy transformation, but its slow kinetics limits its industrial applications. Sub-nano-cluster-decorated electrode interfaces are potential ORR electrocatalysts, but understanding their active sites under electrocatalytic conditions is challenging due to their dynamic nature. In this study, we used global optimization and Grand Canonical DFT to investigate the structure and dynamics of subnano Ptn clusters on electrified graphite. We found that these clusters exist as statistical ensembles of multiple states under electrochemical conditions, and their fluxionality is influenced by the applied potential, electrolyte, and adsorbate coverage.
Article
Chemistry, Physical
Xuhui Li, Yanpin Liu, Haifei Xu, Yangfan Zhou, Xinbing Chen, Zhongwei An, Yu Chen, Pei Chen
Summary: Highly efficient bifunctional catalysts for ORR and OER are essential for rechargeable Zn-air batteries. In this study, Fe3O4 and CoO nanoparticles were integrated into carbon nanoflowers to create an electrocatalyst that reduced the potential gap between ORR and OER to 0.79 V. The Zn-air battery assembled with this catalyst exhibited superior performance compared to Pt/C, including a higher open-circuit voltage, longer discharge time, higher specific capacity, and larger power density.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2023)
Article
Chemistry, Physical
Zhipeng Yu, Chaowei Si, Alec P. LaGrow, Zhixin Tai, Wolfgang A. Caliebe, Akhil Tayal, Maria J. Sampaio, Juliana P. S. Sousa, Isilda Amorim, Ana Araujo, Lijian Meng, Joaquim L. Faria, Junyuan Xu, Bo Li, Lifeng Liu
Summary: This study reports a bimetallic iridium-iron diatomic catalyst (IrFe-N-C) that exhibits excellent performance in oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) and is used in zinc-air batteries.
Article
Chemistry, Multidisciplinary
Yi Pan, Yupeng Xin, Yinghua Li, Zhi Xu, Chen Tang, Xin Liu, Yucheng Yin, Jiacheng Zhang, Fugui Xu, Chen Li, Yiyong Mai
Summary: Porous carbon particles show great potential in energy and catalysis applications. This study successfully prepared nitrogen-doped carbon cubosomes with a high porosity and uniformly distributed active sites using metal-organic frameworks as precursors and polymer cubosomes as templates. These carbon cubosomes exhibit superior electrocatalytic performance and outperform commercial catalysts in zinc-air batteries.
Article
Chemistry, Physical
Ridge M. Bachman, Derek M. Hall, Ljubisa R. Radovic
Summary: This paper focuses on the role of carbon electrodes in vanadium redox flow batteries (VRFB) and uses density functional theory to analyze the chemically and electrocatalytically active sites. The results reveal the importance of carbene-type edge carbon atoms and the potential inhibitory effects of phenolic or carboxyl groups on the redox process.
Review
Chemistry, Multidisciplinary
Minseok Kim, Jaekyung Yi, Seong-Hyeon Park, Sarah. S. S. Park
Summary: This review provides strategic insights into MOF-based electrocatalysts, discussing the introduction of notable active sites and material design principles. It also explores the viability of MOFs as alternatives to currently used electrocatalysts and establishes the future direction of MOF-based electrocatalysis research.
ADVANCED MATERIALS
(2023)
Article
Electrochemistry
Richard W. Haid, Regina M. Kluge, Thorsten O. Schmidt, Aliaksandr S. Bandarenka
Summary: Carbon-based electrodes are increasingly popular as electrocatalysts for fuel cells and metal-air batteries due to their availability and versatility. This study investigated the surface behavior of highly oriented pyrolytic graphite under both ORR and OER conditions in 0.1 M KOH. By using noise analysis in electrochemical scanning tunneling microscopy, active sites were monitored and compared with nanoscale resolution. The results showed that step sites and defects are active for both ORR and OER, while terraces sites are largely inactive and only become involved in the OER at higher potentials. Surface degradation was evaluated during the operation, with no clear evidence of surface destruction observed in the experiments.
ELECTROCHIMICA ACTA
(2021)
Article
Chemistry, Multidisciplinary
Shuai Zhang, Hui Xue, Wan-lu Li, Jing Sun, Niankun Guo, Tianshan Song, Hongliang Dong, Jiangwei Zhang, Xin Ge, Wei Zhang, Qin Wang
Summary: This study successfully constructed a single-atom catalyst with NiN4C10 coordination site, demonstrating excellent ORR activity and stability in alkaline solution, providing important references and insights for the future development in the field of electrocatalysis.
Article
Chemistry, Multidisciplinary
Gengyu Xing, Miaomiao Tong, Peng Yu, Lei Wang, Guangying Zhang, Chungui Tian, Honggang Fu
Summary: This study presents a dual nitrogen source coordinated strategy to achieve high density Cu-N-4 SAS, which exhibits superior ORR activity and stability in alkaline media. The Cu-N-4 SAS supported on 3D N-doped carbon nanotubes/graphene structure shows promising performance in H-2/O-2 AEMFC.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Chemistry, Physical
Weiyuan Ding, Ali Saad, Yuchen Wu, Zhiwei Wang, Xiuting Li
Summary: In this study, FeCo nanoparticles, MNx (M = Fe, Co), and FePx were embedded in porous and graphitized carbon nanotubes (CNTs)/carbon nanofiber (CNF) using electrospinning and chemical vapor deposition (CVD) techniques. The prepared FeCo@CoNx@FePx/C exhibited a high half-wave potential of 0.86 V in oxygen reduction reaction (ORR) and a low oxygen evolution reaction (OER) overpotential of 368 mV at 10 mAmiddotcm(-2). The assembled Zn-air battery (ZAB) showed a high energy efficiency of 65% at 20 mAmiddotcm(-2) and remained stable for 700 charge-discharge cycles. This work has important implications for the design of bifunctional electrocatalysts.
Article
Chemistry, Physical
Haipeng Liu, Shengli Zhu, Zhenduo Cui, Zhaoyang Li, Shuilin Wu, Yanqin Liang
Summary: The synthesis of composite catalyst Cr2O3@Cr-N-C has revealed the roles of different active sites in the ORR process, demonstrating its exceptional ORR activity. The synergistic effect of two types of active sites on this catalyst allows for a near 4e ORR pathway and remarkable ORR performance.
JOURNAL OF CATALYSIS
(2021)
Article
Engineering, Environmental
Haihua Wu, Jiahao Wu, Yudan Li, Wei Li, Juanjuan Zhai, Qike Jiang, Xin Xu, Yunfang Gao
Summary: This study reports a novel strategy to achieve highly exposed and atomically isolated Co-N-4 active sites within porous carbon polyhedron. By increasing the surface area and the number of active sites, the catalytic activity and stability are significantly improved.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Materials Science, Ceramics
Ryoji Inada, Tomoya Mori, Rei Kumasaka, Ryuta Ito, Tomohiro Tojo, Yoji Sakurai
INTERNATIONAL JOURNAL OF APPLIED CERAMIC TECHNOLOGY
(2019)
Article
Chemistry, Analytical
Tomohiro Tojo, Hayato Tawa, Noriyuki Oshida, Ryoji Inada, Yoji Sakurai
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
(2018)
Article
Electrochemistry
Yoshiaki Murata, Shoki Takada, Tomohiro Obata, Tomohiro Tojo, Ryoji Inada, Yoji Sakurai
ELECTROCHIMICA ACTA
(2019)
Article
Chemistry, Analytical
Tomohiro Tojo, Shuhei Kawashiri, Takao Tsuda, Mizuki Kadowaki, Ryoji Inada, Yoji Sakurai
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
(2019)
Article
Chemistry, Multidisciplinary
Toki Moritaka, Yuh Yamashita, Tomohiro Tojo, Ryoji Inada, Yoji Sakurai
Article
Electrochemistry
Yoshiaki Murata, Ryoji Inada, Yoji Sakurai
Summary: The study investigated the influence of electrolyte structure on the Ca2+ ion insertion and extraction properties of V2O5 by changing the concentration or solvent. It was found that the molar ratio of contact ion pairs (CIP) in the total ionic species significantly affected the electrochemical performance. Different electrolytes showed varying capacity and coulombic efficiency, with solvent-separated ion pairs (SSIPs) potentially contributing to performance differences.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2021)
Article
Chemistry, Physical
Ryoji Inada, Atsuto Takeda, Yusuke Yamazaki, Shotaro Miyake, Yoji Sakurai, Venkataraman Thangadurai
ACS APPLIED ENERGY MATERIALS
(2020)
Article
Materials Science, Multidisciplinary
Akihiro Itaya, Kazuki Yamamoto, Ryoji Inada, Yoji Sakurai
Summary: The effect of excess Na contents in precursor on the property of Na2Zn2TeO6 (NZTO) solid electrolyte was investigated. The increase of excess Na contents led to a decrease in the relative densities of sintered NZTO samples and an increase in the conductivity of the samples.
Article
Materials Science, Ceramics
Akihiro Itaya, Kazuki Yamamoto, Ryoji Inada
Summary: We investigated the sintering temperature dependence on the properties of Na2Zn2TeO6 (NZTO) solid electrolyte and found that the samples sintered at 700°C or higher exhibited good relative densities and sodium-ion conductivity. The highest room temperature conductivity was achieved in the sample sintered at 750°C, demonstrating the potential for use in all-solid-state sodium-ion batteries.
INTERNATIONAL JOURNAL OF APPLIED CERAMIC TECHNOLOGY
(2021)
Article
Materials Science, Multidisciplinary
Shusaku Teshima, Yuki Ono, Norimasa Goto, Ryoji Inada
Summary: In this study, Na2Zn2TeO6 (NZTO) ceramic electrolyte thick films were fabricated by aerosol deposition (AD) method without thermal treatment. The thick film formed at room temperature showed acceptable ionic conductivity for thin film sodium-ion battery application.
Article
Materials Science, Multidisciplinary
Daiki Azuma, Ryoji Inada
Summary: Sn4P3 thin films were fabricated using the aerosol deposition process, and their electrochemical performance as a lithium-ion battery anode was investigated in both liquid and solid-state polymer electrolytes. The results showed that the capacity retention of the Sn4P3 film electrode was better in the polymer electrolyte cell than in the liquid electrolyte cell, indicating that high-capacity alloy-based anodes exhibit improved electrochemical performance in solid-state batteries with deformable solid electrolytes.
Article
Electrochemistry
Yusuke Yamazaki, Shotaro Miyake, Keigo Akimoto, Ryoji Inada
Summary: Garnet-type Ta-doped Li7La3Zr2O12 (LLZO) ceramic solid electrolytes with Ga2O3 additive were synthesized. The microstructure and performance of the samples with different Ga2O3 addition were investigated. The sample with 2 mol % Ga2O3 addition showed the highest tolerance for Li dendrite growth.
Article
Materials Science, Multidisciplinary
Hiromasa Hosokawa, Atsuto Takeda, Ryoji Inada, Yoji Sakurai
Article
Electrochemistry
Ryoji Inada, Satoshi Yasuda, Hiromasa Hosokawa, Masaya Saito, Tomohiro Tojo, Yoji Sakurai
Article
Chemistry, Multidisciplinary
Tomohiro Tojo, Ryoji Inada, Yoji Sakurai, Yoong Ahm Kim
