Article
Chemistry, Physical
Deborah S. B. L. Oliveira, Flavio Colmati, Ernesto R. Gonzalez, Ruy de Sousa Junior
Summary: In this study, a neurofuzzy model was developed to investigate the effect of catalyst properties on power generation in direct ethanol fuel cells. The research found that decreasing crystal size has the greatest influence on maximizing power density, and medium potentials and medium integrated intensity are also favorable. Rating: 9/10.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Chemistry, Physical
Kang Xu, Feng Zhu, Mingyang Hou, Canan Li, Hua Zhang, Yu Chen
Summary: Coating the surface of a nickel-based anode with cerium oxide nanoparticles can activate and stabilize ammonia fuel, leading to improved efficiency and durability of solid oxide fuel cells.
Article
Chemistry, Physical
Kang Xu, Feng Zhu, Mingyang Hou, Canan Li, Hua Zhang, Yu Chen
Summary: This study reports on the surface activation and stabilization of a Ni-based cermet anode for efficient and durable operation on ammonia fuel. The surface coating of CeO2-delta nanoparticles significantly enhances the reaction activity and stability, leading to improved performance compared to bare anodes.
Article
Chemistry, Physical
Sergey S. Shapovalov, Natalia A. Mayorova, Alexander D. Modestov, Andrei A. Shiryaev, Alexander Egorov, Vitali A. Grinberg
Summary: The structural characteristics and electrocatalytic activity of nanosized PtMo, PtFe, and PtMoSn catalysts deposited on highly dispersed carbon black were investigated. The results showed that the synthesized catalysts exhibited higher specific activity compared to a commercial catalyst.
Article
Chemistry, Multidisciplinary
Cyril Tlou Selepe, Sandile Surprise Gwebu, Thabo Matthews, Tebogo Abigail Mashola, Ludwe Luther Sikeyi, Memory Zikhali, Nobanathi Wendy Maxakato
Summary: Carbon nano-onions (CNOs) were successfully synthesized using flame pyrolysis, with Pd-Sn/CNOs electro-catalysts showing improved performance in methanol and ethanol electro-oxidation under alkaline conditions. The characterization techniques confirmed the structure and properties of the materials, with PdSn alloy formation on the CNO surface contributing to the enhanced catalytic activity.
Article
Engineering, Environmental
Ying Yang, Xiaofei Zhu, Caini Yi, Hang Yang, Xiaolong Hou, Xuan Liao, Changguo Chen, Danmei Yu, Xiaoyuan Zhou
Summary: NiFe-x binary alloy catalysts were prepared by one-step potentiostatic electrodeposition, and the effects of Fe introduction on the morphology, structure, and electrochemical properties were investigated. The results showed that the appropriate introduction of Fe could refine the size of the catalyst particles, increase effective catalytic active sites, and improve catalytic activity. It also changed the electron distribution of Ni, enhancing the adsorption to reactants and inhibiting hydrogen evolution reaction, leading to increased catalytic selectivity. When assembled with the NiFe-2 catalyst anode, the direct borohydride fuel cell achieved a peak power density of 540 mW cm-2 and an open circuit voltage of 1.87 V at 298 K. This study may provide new insights for the design and development of efficient noble metal-free anode catalysts for DBFC.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Physical
Ziqi Wang, Kai Bo, Yong Wang, Yongzhen Wang
Summary: This study focuses on the development of high-performance catalysts for ethanol oxidation reaction (EOR) in direct ethanol fuel cells (DEFCs). The researchers successfully synthesized a highly porous nitrogen-doped carbon material (NC-E) from ZIF-8 using a novel method assisted by eutectic salts. The NC-E supported Pt-Sn catalyst exhibited improved electrochemical activity and stability, surpassing traditional carbon materials and carbon black.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Electrochemistry
Keenan Black-Araujo, Diala A. Alqdeimat, Reza Alipour Moghadam Esfahani, Reza B. Moghaddam, Peter G. Pickup, E. Bradley Easton
Summary: This article introduces a carbon-free catalyst composed of platinum nanoparticles deposited onto a Ti3O5Mo0.2Si0.4 support (Pt/TOMS). Compared to Pt/C catalyst, Pt/TOMS exhibits higher activity, lower resistance values, and lower activation energies, making it a more suitable catalyst material for use in DEFCs.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2022)
Article
Energy & Fuels
Panpan Zhang, Liang Hu, Bin Zhao, Ze Lei, Ben Ge, Zhibin Yang, Xinfang Jin, Suping Peng
Summary: In this study, the protective catalyst layer of LSCFN with anchored nanoscale Co-Fe alloy was evaluated for ethanol-fueled SOFCs. The addition of the LSCFN catalyst layer can protect the fuel cells from thermal-mechanical stress-induced cracking and severe coking in ethanol fuel.
Article
Chemistry, Physical
Boxun Hu, Grace Lau, Kevin X. Lee, Seraphim Belko, Prabhakar Singh, Michael C. Tucker
Summary: The study demonstrates the potential of metal supported solid oxide fuel cells (MS-SOFC) for transportation applications using ethanol and methanol as fuels. By integrating a high entropy alloy (HEA) internal reforming catalyst (IRC), the cell performance and stability are greatly improved, especially when using ethanol/water blend fuel.
JOURNAL OF POWER SOURCES
(2023)
Article
Engineering, Chemical
M. Florencia Azcoaga Chort, Pablo A. Nagel, Natalia S. Veizaga, Virginia I. Rodriguez, Sergio R. de Miguel
Summary: Bimetallic PtSn catalysts supported on multiwalled carbon nanotubes were prepared with different Pt:Sn atomic ratios for ethanol electro-oxidation. Among the catalysts tested, Pt(20)Sn(12.17)/CNT exhibited the highest electrocatalytic activity for ethanol oxidation.
CANADIAN JOURNAL OF CHEMICAL ENGINEERING
(2022)
Article
Chemistry, Physical
Yu-Wen Chen, Han-Gen Chen, Man-Yin Lo, Yan-Chih Chen
Summary: Using H2O2 to modify carbon black can increase the amount of functional groups on the surface, thereby increasing the metal dispersion and decreasing metal particle size. NaH2PO2 as a reducing agent can suppress the growth of metal particles. The best modified carbon black catalyst is the one modified with 30% H2O2, and the methanol oxidation activity of the catalyst is mainly related to the particle size of PtRu metal, rather than the surface area and conductivity of carbon black.
Article
Chemistry, Physical
Xiao-Di Tang, Yi-yang Wang, Chao-Yang Wang, Lei Yuan, Yong Yi
Summary: In this study, a platinum-bismuth alloy catalyst (PtBi@CA) was synthesized by a one-step reduction method without the use of structure directing agents and stabilizers. The PtBi@CA(50-50) catalyst exhibited the smallest crystallite size and achieved high peak current density and pseudo-steady current density of 64.336 mA/cm2 and 0.096 mA/cm2, respectively, which were 11.22 times and 1.85 times higher than those of the most advanced commercial carbon-supported platinum catalysts (Pt/C). This method offers a simple and feasible approach to significantly reduce the usage of precious metals and shows great potential in the synthesis of anode electrocatalysts for direct ethanol fuel cells.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Physical
Kayoung Park, Masaki Goto, Magnus So, Sakae Takenaka, Yoshifumi Tsuge, Gen Inoue
Summary: The study investigated the effect of SiO2 layer in a cathode catalyst layer on the performance of polymer electrolyte fuel cells. The SiO2-coated Pt/KB catalyst showed improved performance at 20% relative humidity, attributed to the hydrophilic nature of SiO2 enhancing proton conductivity.
Article
Green & Sustainable Science & Technology
Panpan Zhang, Yanru Yang, Zhibin Yang, Suping Peng
Summary: In this study, an integrated catalyst layer Cu-CeO2/8 mol% Y2O3-ZrO2 was synthesized and applied in solid oxide fuel cells (SOFCs) fueled by methanol. The addition of the integrated catalyst layer reduced the polarization resistance by 55.2% and increased the peak power density by 42.32%, demonstrating good stability.
Article
Engineering, Chemical
Hirokazu Ishitobi, Ayaka Ida, Shuhei Anayama, Nobuyoshi Nakagawa
JOURNAL OF CHEMICAL ENGINEERING OF JAPAN
(2016)
Article
Electrochemistry
Koichi Kasahara, Hirokazu Ishitobi, Shota Yamamori, Nobuyoshi Nakagawa
JOURNAL OF ELECTROCHEMICAL ENERGY CONVERSION AND STORAGE
(2016)
Article
Electrochemistry
J. Saito, H. Ishitobi, N. Nakagawa
Article
Chemistry, Physical
Hirokazu Ishitobi, Yusuke Kawatsu, Yuhei Kudo, Nobuyoshi Nakagawa
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2019)
Article
Chemistry, Applied
Nobuyoshi Nakagawa, Hirokazu Ishitobi, Soma Abe, Masaki Kakinuma, Hiroshi Koshikawa, Shunya Yamamoto, Tetsuya Yamaki
Summary: A novel method was used to prepare highly-active anode catalysts for DMFCs by investigating the effects of high-energy ion irradiation on the CeO2 embedded carbon nanofiber support of the PtRu/CECNF catalyst. The ion irradiation resulted in improved activity, with almost two times higher current density achieved with Ar ion irradiation at a certain ion-fluence, while higher ion-fluence reduced the activity. The change in catalytic activity was correlated with the increase in lattice distance of CeO2, indicating that oxygen atom vacancies enhanced the activity.
Article
Chemistry, Physical
Ryota Meguro, Hirokazu Ishitobi, Ryo Suto, Toru Mitsuyoshi, Kaito Uehara, Yoshihiro Otsuka, Nobuyoshi Nakagawa
Summary: The performance of free-standing graphene oxide (GO) membranes in fuel cells can be significantly improved by oxidation and modification with vinilsulfonic acid, leading to increased proton conductivity and durability. Specifically treated GOhvsi membrane showed very high in-plane proton conductivities at 30 degrees C and achieved high maximum power densities in H-2-O-2 fuel cells.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Electrochemistry
Hirokazu Ishitobi, Honoka Doki, Soshi Shiraishi, Hidehiko Tsukada, Yoshikiyo Hatakeyama, Ryusuke Obata, Nobuyoshi Nakagawa
Summary: We investigated the importance of the crystallinity of the carbon matrix and the surface oxygen groups for enhancing the activity of electrochemical reactions in vanadium redox flow batteries (VRFBs). We used seamless carbon materials with consecutive macropores as a novel electrode material for VRFBs. The electrode activity was found to be increased at higher crystallinity of the carbon matrix, suggesting that the increased pi electron density enhanced ion exchange between active materials and protons at active sites.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2023)
Article
Energy & Fuels
Yosuke Tsukagoshi, Hirokazu Ishitobi, Nobuyoshi Nakagawa
CARBON RESOURCES CONVERSION
(2018)
