Article
Chemistry, Multidisciplinary
Luyu Zhu, Dongdong Xu, Chenglin Yi
Summary: One-dimensional RhCo alloy nanowires with an ultrathin thickness and abundant defect sites were prepared using a nanoconfined attachment growth route in an aqueous solution. Thanks to their unique structure and alloy composition, these nanowires exhibited superior activity and stability in alkaline hydrogen evolution electrocatalysis.
CHEMICAL COMMUNICATIONS
(2023)
Article
Engineering, Environmental
Wanli Liang, Mengyan Zhou, Xiulan Li, Lijie Zhu, Zhixin Li, Yifan Zhou, Jian Chen, Fangyan Xie, Hao-Fan Wang, Nan Wang, Yanshuo Jin, Hui Meng
Summary: Hydrogen energy is the most suitable solution for long-term, large-scale energy storage. The design of efficient, economical, and stable electrocatalysts for hydrogen oxidation reaction (HOR) and hydrogen evolution reaction (HER) is crucial for its commercial development. In this study, a Ni nanocluster supported on oxygen-vacancy-rich MoO2 (Ni/MoO2_x) is designed and it shows excellent hydrogen electrocatalytic activity.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Physical
Eric D. Rus, Ryo H. Wakabayashi, Hongsen Wang, Hector D. Abruna
Summary: The rate of methanol oxidation on Pt electrode is influenced by hydroxide ion concentration, mass transport, and adsorption. With varying hydroxide concentration, the reaction can shift from a transport-limited regime to an inhibitory regime, and the pH reaches a steady state during hydroxide transport limited methanol oxidation.
Article
Materials Science, Multidisciplinary
Shenghan Su, Laure Bourgeois, Nikhil V. Medhekar
Summary: The high strength of structural aluminium alloys is due to the controlled precipitation of specific intermetallic phases. In this study, we investigate the AlPt system and design a workflow to predict the thermodynamics of various phases and their precipitation sequence in binary alloying systems. Our findings suggest that Al2Pt will precipitate first and form bulk-like interfaces similar to Al2Au rather than Al2Cu.
Article
Chemistry, Multidisciplinary
Liyuan Wang, Shuang Meng, Chongyang Tang, Changhong Zhan, Shize Geng, Kezhu Jiang, Xiaoqing Huang, Lingzheng Bu
Summary: In this study, high-index-facet Pt-nickel-indium fishbone-like nanowires (PtNiIn FNWs) were explored as efficient alkaline HOR catalysts. These catalysts demonstrated higher mass and specific activities than commercial catalysts, along with a higher CO tolerance ability. The unique structure and synergy among Pt, Ni, and In endowed these PtNiIn FNWs with optimized hydrogen binding energy and advantageous hydroxide binding energy, resulting in excellent alkaline HOR properties.
Article
Chemistry, Physical
Yangyang Ren, Baosong Li, Chenhao Lv, Fan Gao, Xiaojing Yang, Lanlan Li, Zunming Lu, Xiaofei Yu, Xinghua Zhang
Summary: In this study, defect-rich PtPdCu flower-like nanoframes were successfully synthesized by oxidative etching. The PtPdCu flower-like nanoframes exhibited enhanced catalytic activity due to their novel structures with rich defects and the synergistic effect between Pd, Cu, and Pt. Furthermore, they showed exceptional stability even after long-term accelerating tests.
APPLIED SURFACE SCIENCE
(2022)
Article
Energy & Fuels
Ali Karaca, Andreas Gluesen, Klaus Wippermann, Scott Mauger, Ami C. C. Yang-Neyerlin, Steffen Woderich, Christoph Gimmler, Martin Mueller, Guido Bender, Horst Weller, Marcelo Carmo, Detlef Stolten
Summary: In order to maximize the performance potential of a PtNi alloy catalyst in the cathode of DMFCs, the effects of various factors such as manufacturing technique, ink composition, layer composition, and catalyst loading were studied. Detailed analysis was done on the electrochemically active surface area, charge-transfer resistance, layer quality, and ink properties, and their relationship with the mentioned factors was examined. Optimized catalyst layers were successfully fabricated using ultrasonic spray coating, which showed high performance even with lower Pt content than commercial products. This approach allows for tailoring of catalyst layers according to the requirements of DMFCs, hydrogen fuel cells, or polymer electrolyte membrane electrolysis cells.
Article
Chemistry, Inorganic & Nuclear
Xinwei Zhao, Chunxiao Chai, Jiaqi Qin, Yizheng Guo, Chunxiao Wang, Rui Gao, Yuanyuan Cong, Yujiang Song
Summary: The pyrolysis of NiFe-containing nanocrystals results in the formation of NiFe alloy particles embedded in carbon with a size of 10.2 +/- 2.4 nm. The alloy particles exhibit an exceptional area specific exchange current density of 0.048 mA cm(Ni)(-2) for the alkaline hydrogen oxidation reaction, which is attributed to the optimized hydrogen and hydroxyl adsorption strength due to the alloying effect between Ni and Fe.
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
(2022)
Article
Crystallography
Antanas Nacys, Dijana Simkunaite, Aldona Balciunaite, Ausrine Zabielaite, Daina Upskuviene, Benjaminas Sebeka, Vitalija Jasulaitiene, Vitalij Kovalevskij, Eugenijus Norkus, Loreta Tamasauskaite-Tamasiunaite
Summary: In this study, a platinum-coated Ni foam catalyst showed enhanced electrocatalytic activity for the oxidation of formate in an alkaline medium. It promoted the reaction at more negative potentials than a pure Pt electrode, indicating high activity. The catalyst also proceeded the reaction via a direct pathway mechanism without significant accumulation of poisonous carbonaceous species.
Review
Chemistry, Physical
Xiaoning Wang, Xuejin Li, Dongqing Kong, Lianming Zhao, Yongpeng Cui, Yesheng Wang, Tonghui Cai, Qingzhong Xue, Zifeng Yan, Wei Xing
Summary: This review analyzes the current status and challenges of Pt-free electrocatalysts for anion exchange membrane fuel cells (AEMFCs). It first discusses the mechanisms and kinetics of alkaline hydrogen oxidation reaction (HOR), and then summarizes recent advances in supports, cocatalysts, and active components of Pt-free HOR catalysts. Finally, the future directions for Pt-free electrocatalysts for alkaline HOR are outlined.
Article
Chemistry, Physical
Min Ma, Guang Li, Wei Yan, Zhuangzhuang Wu, Zhiping Zheng, Xibo Zhang, Qiuxiang Wang, Guifen Du, Deyu Liu, Zhaoxiong Xie, Qin Kuang, Lansun Zheng
Summary: In this study, a novel single-atom fine-tailoring strategy based on a highly hydrophilic Mo-bifunctional promoter was proposed to greatly boost the hydrogen oxidation reaction (HOR) on Pt catalysts. The designed Mo-Pt/NC exhibited remarkable mass-specific kinetic current and superior anti-CO poisoning capability.
ADVANCED ENERGY MATERIALS
(2022)
Article
Chemistry, Physical
Moritz Eder, Carla Courtois, Philip Petzoldt, Sonia Mackewicz, Martin Tschurl, Ueli Heiz
Summary: In the past decade, research on photocatalytic hydrogen evolution from alcohol oxidation on metal-loaded TiO2 has gained attention. This study compares size-selected Ni and Pt clusters as co-catalysts on a TiO2(110) single crystal and explores the size and coverage effects on the catalyst performance during photocatalytic hydrogen evolution.
Article
Chemistry, Physical
Moritz Eder, Carla Courtois, Philip Petzoldt, Sonia Mackewicz, Martin Tschurl, Ueli Heiz
Summary: In the past decade, photocatalytic hydrogen evolution from metal-loaded TiO2 has received significant attention. This study compares size-selected Ni and Pt clusters as co-catalysts on a TiO2(110) single crystal and investigates the size- and coverage-dependent effects on the catalyst performance. Larger clusters and higher coverages of Ni enhance the product formation rate, while Pt co-catalysts exhibit a stable and higher activity, but size-specific effects need to be considered.
Article
Chemistry, Multidisciplinary
Yu-Rim Hong, Soumen Dutta, Sun Woo Jang, Odongo Francis Ngome Okello, Hyeonae Im, Si-Young Choi, Jeong Woo Han, In Su Lee
Summary: This study addresses the inefficient interfacial contact effect in Pt-catalyzed alkaline hydrogen evolution reaction (HER) by producing atomically flat two-dimensional Pt nanodendrites (2D-PtNDs) and realizing a maximized and firmly bound lateral heterointerface with NiFe-layered double hydroxide (LDH). This work demonstrates the importance of shape and facet of Pt in creating heterointerfaces that provide catalytic synergy for efficient hydrogen production.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2022)
Article
Chemistry, Physical
Hamid R. Zamanizadeh, Alejandro. Oyarce Barnett, Svein Sunde, Bruno G. Pollet, Frode Seland
Summary: Four different alloys are electro-oxidized, evaluated, and characterized for their OER activity in alkaline conditions. The study shows that an increase in surface nickel content improves the OER activity. The activated SS316 anode outperforms both the Ni and untreated SS316 anodes under various temperature and pressure conditions. The in-situ activation method also enhances the OER activity of SS316.
JOURNAL OF POWER SOURCES
(2023)
Article
Chemistry, Multidisciplinary
Sasidharan Sankar, Soni Roby, Hidenori Kuroki, Shoji Miyanishi, Takanori Tamaki, Gopinathan M. Anilkumar, Takeo Yamaguchi
Summary: The noble metal-free Ni2P-Fe/NF electrode is a high-performing anode electrode that can be used in AEMWE systems with the assistance of a durable ether-free aromatic polyelectrolyte. The electrode exhibits a low cell voltage and excellent energy conversion efficiency, and can operate stably for up to 24 hours.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2023)
Article
Chemistry, Physical
Takeo Yamaguchi, Shijina Kottarathil, Sreekanth Narayanaru, Sreekuttan M. Unni, Takanori Tamaki, Hidenori Kuroki, Unnikrishnan Nai r Saraswathy Hareesh, Gopinathan M. Anilkumar
Summary: In this study, an anode catalyst derived from trimetallic zeolitic imidazolate framework (ZIF) was developed, and its performance in sodium borohydride electrooxidation was enhanced by improving its porosity and conductivity. The results showed that the catalyst enabled an eight-electron transfer in the electrooxidation of sodium borohydride.
ACS APPLIED ENERGY MATERIALS
(2022)
Article
Chemistry, Physical
Hidenori Kuroki, Shoji Miyanishi, Takanori Tamaki, Sasidharan Sankar, Gopinathan M. Anilkumar, Masazumi Arao, Junichi Shimanuki, Masashi Matsumoto, Hideto Imai, Takeo Yamaguchi
Summary: A major challenge in DF-AEMFCs is the low chemical durability of MEAs. In this study, MEAs with polyphenylene-based electrolytes and a carbon-free cathode catalyst layer were developed, showing high performance and stability. The carbon-free connected nanoparticle catalysts were found to be more advantageous than Pt/C for AEMFCs.
ACS APPLIED ENERGY MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Noriko Nakamura, Seiichi Ohta, Mariko Yamada, Yukimitsu Suzuki, Natsuko F. Inagaki, Takeo Yamaguchi, Taichi Ito
Summary: This study developed a K+-responsive star copolymer that can alter its aggregation, adhesion, and interaction with cells by applying suitable stimuli. Microsized aggregates with a diameter of 5.5 μm were successfully formed in the absence of K+ ions, and in the presence of K+ ions, these aggregates dispersed due to a shift in lower critical solution temperature (LCST).
Article
Engineering, Chemical
Hidenori Kuroki, Masashi Matsumoto, Takanori Tamaki, Hideto Imai, Takeo Yamaguchi
Summary: This study analyzed the correlation between the oxygen reduction reaction (ORR) activity of platinum (Pt)-based catalysts and the adsorption characteristics of oxygen species on Pt surfaces. The results showed that the connected Pt-Fe catalyst exhibited lower oxidation by water and higher O-species adsorption under the ORR, indicating its beneficial structure for enhancing the ORR activity in terms of O-species adsorption and oxide formation on a Pt surface.
JOURNAL OF CHEMICAL ENGINEERING OF JAPAN
(2023)
Article
Chemistry, Multidisciplinary
Sreekanth Narayanaru, Shoji Miyanishi, Hidenori Kuroki, Gopinathan M. M. Anilkumar, Takeo Yamaguchi
Summary: This study examined the durability of a trimethylammonium-modified poly(fluorene-alt-tetrafluorophenylene) (PFT-C-10-TMA) membrane and ionomer under dynamic operation, evaluating its ability to adapt to intermittent power sources. The results showed that the PFT-C-10-TMA membrane and ionomer exhibited high chemical and mechanical durability under dynamic start-stop operation, encouraging the development of electrolyzers that can utilize intermittent renewable power sources.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2023)
Review
Engineering, Chemical
Yuuki Sugawara, Sasidharan Sankar, Shoji Miyanishi, Rajith Illathvalappil, Pranav K. Gangadharan, Hidenori Kuroki, Gopinathan M. Anilkumar, Takeo Yamaguchi
Summary: The production of green-H-2 through water electrolysis from renewable energies is crucial for developing sustainability and cost-effectiveness. Anion exchange membrane water electrolyzer (AEMWE) is a promising alternative to fossil fuel-based energy platforms, employing inexpensive nonprecious metal catalysts and current collectors. Membrane electrode assemblies (MEAs) play a significant role in the efficiency of hydrogen production in AEMWE. This review highlights the performances and components of MEAs, such as AEMs and catalysts, with a comprehensive discussion of current progress and future research directions for commercializing AEMWE as a cost-effective and high-purity hydrogen production method.
JOURNAL OF CHEMICAL ENGINEERING OF JAPAN
(2023)
Article
Polymer Science
Yuuki Sugawara, Toshiyuki Hirose, Susumu Kawauchi, Takeo Yamaguchi
Summary: In this study, a poly(NIPAM-co-CD-co-DBD) material was designed to achieve highly responsive temperature-induced autonomous reswelling through CD-DBD complexation. The autonomous reswelling was successfully detected based on the fluorescent character of DBD, demonstrating the capability for visual detection.
Article
Chemistry, Physical
Yuuki Sugawara, Keigo Kamata, Aoi Matsuda, Takeo Yamaguchi
Summary: Iron-based phosphates are efficient precatalysts for the anodic oxygen evolution reaction in water splitting. The electrochemically generated Fe-based compounds show significantly higher OER activity than the best conventional catalyst. Postcharacterization analysis reveals the transformation of Fe3O3(PO4) into Fe-based (oxyhydr)oxides with phosphorus dissolution.
ACS APPLIED ENERGY MATERIALS
(2023)
Article
Chemistry, Physical
Sankar Sasidharan, Rajith Illathvalappil, S. Assa Aravindh, Hidenori Kuroki, Gopinathan M. Anilkumar, Takeo Yamaguchi
Summary: This study presents a self-supported and low Ru-loaded metal phosphide electrode for efficient alkaline hydrogen evolution reaction (HER) through galvanic replacement and low-temperature annealing. The electrode exhibited excellent HER performance and durability, and the factors affecting the performance were analyzed through surface characteristics and first principles calculations. Water splitting studies demonstrated the compatibility and noteworthy performance of the catalyst for efficient electrolysis, showcasing its potential in commercial water electrolyzer systems for green hydrogen generation.
SUSTAINABLE ENERGY & FUELS
(2023)
Article
Chemistry, Multidisciplinary
Takaya Ogawa, Gopinathan M. Anilkumar, Takanori Tamaki, Hidenori Ohashi, Takeo Yamaguchi
Summary: The dependence of proton conductivity on relative humidity is a major issue in proton-conducting materials. By adjusting the concentration and distance of acid groups in the materials, the dependence of proton conductivity on relative humidity can be reduced.
MATERIALS CHEMISTRY FRONTIERS
(2022)
