Article
Chemistry, Inorganic & Nuclear
Anna Carissa M. San Esteban, Naoto Kuwamura, Nobuto Yoshinari, Takumi Konno
Summary: In this study, a heterometallic coordination polymer was synthesized to exhibit heterogeneous electrocatalytic activities for both water reduction and water oxidation, with water oxidation activity mediated by Br- ions.
DALTON TRANSACTIONS
(2021)
Article
Chemistry, Physical
Rohit Anand, Arun S. Nissimagoudar, Muhammad Umer, Miran Ha, Mohammad Zafari, Sohaib Umer, Geunsik Lee, Kwang S. Kim
Summary: In this study, it is demonstrated that late transition metal doping can significantly enhance the HER/OER activities of MXenes. By embedding a single Ni or Co atom into MXenes, it provides a suitable amount of electrons for optimal adsorbate evolving mechanism, resulting in activated lattice oxygen mechanism. The stability and bifunctional catalytic capability of MXene combinations towards both HER and OER are shown.
ADVANCED ENERGY MATERIALS
(2021)
Article
Chemistry, Inorganic & Nuclear
Yumeng Li, Belvin Thomas, Chaoyun Tang, Tewodros Asefa
Summary: Controlling the ratio of metals in MOFs can alter the structures and tailor the electrocatalytic properties. In this study, a series of Co-Ni bimetallic MOFs with different aspect ratios were synthesized using a simple, low temperature route. Among them, the Co15Ni1-MOF exhibited the highest electrocatalytic performance for OER in alkaline solution.
DALTON TRANSACTIONS
(2023)
Article
Chemistry, Physical
Olawale Olaoluwa Dada, Sina Karimzadeh, Patrick Ehi Imoisili, Tien-Chien Jen
Summary: A systematic computational investigation was conducted to explore the factors and mechanisms that determine the catalytic activity of molybdenum phosphide (MoP). The presence of phosphorus was found to enhance the intrinsic catalytic activity and proton adsorption kinetics of the (100) surface of MoP nanoparticles, making it highly suited for the hydrogen evolution reaction (HER) analogues to platinum. This study highlights the importance of phosphorizing and surface faceting in improving the catalytic performance of transition metals.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Review
Chemistry, Physical
Mengyang Zhang, Keyu Xu, Ning Sun, Yanling Zhuang, Longlu Wang, Dafeng Yan, Bo Weng
Summary: This article reviews the application of bimetallic single-atom catalysts in electrocatalytic and photocatalytic hydrogen evolution reactions. It highlights the unique configuration and synergistic effects of these catalysts. The review covers recent advances in bimetallic single-atom catalysts under acidic/alkaline conditions, as well as their application in photocatalysis on semiconducting carbon nitrides. An outlook is provided on the opportunities and challenges in controlling catalyst synthesis and understanding bimetallic interactions.
Article
Chemistry, Physical
Kinjal K. Joshi, Pratik M. Pataniya, Gopala Bhadu, C. K. Sumesh
Summary: Cu2CoSnS4, Cu2SnS3, Cu2CoS4, Co2SnS3, Cu2S, CoS2, and SnS2 were synthesized through a simple solid-phase approach. The characterized results indicate the formation of pure phase and porous morphology. Among them, Cu2CoSnS4 shows excellent catalytic activity with a low overpotential and high current density for the hydrogen evolution reaction. Moreover, Cu2CoSnS4 exhibits lower Tafel slope and charge transfer resistance compared to other chalcogenide-based electrodes. It also demonstrates good stability under a specific current density in an acidic environment.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Chemistry, Physical
Shumin Li, Jingyun Wang, Xiaoyu Lv, Song Zheng, Jin Wang, Zhengquan Li
Summary: To enhance the electrocatalytic performance, efficient electrocatalysts should have suitable adsorption/desorption intensity for intermediates and good transportation capability of mass and electrons. This study proposes a MOF-derived route to prepare composition-tunable Fe-Ni bimetallic phosphides as efficient electrocatalysts for water splitting. The crystallinity, morphology, and composition of the electrocatalysts can be well controlled by adjusting the phosphating temperature. Overall water splitting was achieved with an overpotential of about 1.63 V@10 mA cm(-2), demonstrating the potential of these electrocatalysts.
CATALYSIS SCIENCE & TECHNOLOGY
(2023)
Article
Chemistry, Multidisciplinary
Jinsong Wang, Sisi Xin, Yao Xiao, Zhengfu Zhang, Zhimin Li, Wang Zhang, Caiju Li, Rui Bao, Jian Peng, Jianhong Yi, Shulei Chou
Summary: Transition-metal alloys are attracting attention as potential electrocatalysts for the alkaline hydrogen evolution reaction (HER). This study provides an improved d-band theory and discovers a potential NiCu electrocatalyst with near-optimal HER activity. Oxygen atoms are introduced into the alloy to balance the adsorption/desorption of hydroxyl species, and tailored electrocatalytic sites facilitate the alkaline HER. The prepared O-NiCu exhibits excellent HER activity.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Chemistry, Physical
Respati K. Pramadewandaru, Jeong-Hu Shim, Young Wook Lee, Jong Wook Hong
Summary: The synthesis of bimetallic Pd-Pt nanodendrites can improve their electrocatalytic properties, showing promising potential for various applications.
Article
Engineering, Environmental
Changlong Xiao, Rohit Ranganathan Gaddam, Yilan Wu, Xiaoming Sun, Yan Liang, Yibing Li, Xiu Song Zhao
Summary: Metal phosphides have shown promise as electrocatalysts for the hydrogen evolution reaction (HER), but their applications are limited by low electronic conductivity in neutral electrolytes. This study demonstrates a novel approach to significantly enhancing HER performance by modifying hierarchical iron phosphide with metallic iron. The presence of iron in the catalyst accelerates charge transport kinetics and improves proton adsorption during water electrolysis, leading to high catalytic rates and long-term stability in neutral electrolytes.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Chemistry, Physical
Noto Susanto Gultom, Mikha Zefanya Silitonga, Dong-Hau Kuo
Summary: In this study, a bimetallic CoNix alloy was prepared using a radio frequency magnetron sputtering technique and exhibited promising performance for electrocatalytic hydrogen evolution reaction (HER) in alkaline solutions. The optimized CoNi4 ratio showed low overpotentials and high current densities, with a large electrochemical surface area and low electron-transfer resistance. This work provides a foundation for developing bimetallic CoNix alloys as efficient HER catalysts for electrochemical energy.
ACS APPLIED ENERGY MATERIALS
(2022)
Article
Chemistry, Physical
Taiping Hu, Pengfei Li, Wei Zhang, Yixing Ye, Jun Liu, Yunyu Cai, Guofeng Zhang, Kai Dai, Changhao Liang
Summary: Designing high-performance catalysts for electrocatalytic hydrogen production remains a significant challenge. Small-size bimetallic alloy nanoparticles have garnered considerable attention in the field of electrocatalysis due to their large exposure of effective active sites and optimal geometric/electronic effects. In this study, ultra-small bimetallic PtM (M=Ni, Co) alloy nanoparticles (approximately 1.7 nm) were synthesized on carbon supports through laser irradiation in liquids. This unique method leverages the effective absorption of pulse laser energy by carbon supports to generate high temperatures, enabling the reduction of metallic ions precursors by ethanol molecules and the subsequent formation of alloy nanoparticles. The resulting bimetallic PtNi alloy nanoparticles exhibited significantly improved catalytic performance in the hydrogen evolution reaction (HER).
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Nanoscience & Nanotechnology
K. Chhetri, A. Muthurasu, B. Dahal, T. Kim, T. Mukhiya, S. -h. Chae, T. H. Ko, Y. C. Choi, H. Y. Kim
Summary: An efficient and stable electrocatalyst for overall water splitting in alkaline media was successfully prepared using a rational design of two-dimensional metal-organic framework (MOF)-derived mesoporous structures. The catalyst exhibited enhanced electrocatalytic activity towards the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) due to abundant heterointerfaces, mesoporous nanostructures, and multimetallic active centers. This work opens up new possibilities for exploring MOF-based catalysts for overall water splitting applications.
MATERIALS TODAY NANO
(2022)
Article
Chemistry, Physical
Deviprasath Chinnadurai, Rajmohan Rajendiran, Oi Lun Li, Kandasamy Prabakar
Summary: The efficient manganese and cobalt bimetallic phosphate electrocatalyst reported in this study exhibits faster charge transfer rate and excellent reaction performance for both hydrogen evolution reaction (HER) and oxygen evolution reaction (OER). By combining with PANI nanowires, a durable electrolyzer with impressive performance is fabricated, offering a promising approach for efficient total water splitting.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2021)
Article
Chemistry, Inorganic & Nuclear
Pei-Hua Zhao, Jian-Rong Li, Zhong-Yi Ma, Hong-Fei Han, Yong-Ping Qu, Bao-Ping Lu
Summary: This study presents the synthesis of a novel diiron azadithiolate compound covalently attached to carbon nanotubes for efficient electrocatalytic proton reduction to H-2 in an aqueous medium. The hybrid material exhibited a remarkably positive reduction potential in water, along with a high turnover frequency for H-2 production under electrochemical conditions.
INORGANIC CHEMISTRY FRONTIERS
(2021)
Article
Chemistry, Inorganic & Nuclear
Xuemei Yang, Christopher R. DeLaney, Kyle T. Burns, Lindy C. Elrod, Wenting Mo, Haley Naumann, Nattamai Bhuvanesh, Michael B. Hall, Marcetta Y. Darensbourg
Summary: A self-assembled tetrameric nickel cage with carboxylate linkages was obtained through various synthetic routes. The tetramer can dissociate into monomeric units in solution, and removal of four iodides by silver ion precipitation results in an analogous species with an additional vacant coordination site. Electrochemical experiments demonstrated that trifluoroacetic acid as a proton source led to hydrogen production from both electroprecatalysts, with electrocatalysis primarily developing from uncharacterized deposits on the electrode.
INORGANIC CHEMISTRY
(2021)
Article
Chemistry, Multidisciplinary
Brenna K. Collins, Melissa Clough Mastry, Andreas Ehnbom, Nattamai Bhuvanesh, Michael B. Hall, John A. Gladysz
Summary: A series of complexes were synthesized and characterized, showing similar NMR and IR properties. However, cyclic voltammetry revealed only irreversible oxidations for these compounds. UV-visible spectra of the complexes displayed intense and red-shifted bands compared to mono-platinum or Pt(C equivalent to C)(2)Pt species.
CHEMISTRY-A EUROPEAN JOURNAL
(2021)
Article
Chemistry, Multidisciplinary
Dante A. Castillo Molina, Taveechai Wititsuwannakul, Frank Hampel, Michael B. Hall, John A. Gladysz
Summary: Reactions of Li+[(η5-C5H5)Re(NO)(PPh3)](-) with 2- and 4-chloroquinoline or 1-chloroisoquinoline yield sigma quinolinyl and isoquinolinyl complexes. Further reactions or addition of other compounds can lead to the formation of various quinolinium salts.
CHEMISTRY-A EUROPEAN JOURNAL
(2021)
Article
Chemistry, Inorganic & Nuclear
Zachary M. Martinez, Tucker M. Folsom, Yicheng Tong, Ashley K. Archambeau, Donald J. Darensbourg, Michael B. Hall, Cynthia B. Powell, Gregory L. Powell
Summary: The mechanism of CO substitution reaction involving diosmium carbonyl sawhorse complex was studied experimentally and theoretically, revealing a dissociative interchange mechanism. Kinetic measurements and stability studies were in agreement with each other, explaining the unexpected combination of kinetics and stability characteristics observed in the reaction.
INORGANIC CHEMISTRY
(2022)
Article
Chemistry, Inorganic & Nuclear
Xin Yang, Robert M. Chin, Michael B. Hall
Summary: Density functional theory (DFT) was used to investigate the geometric and electronic structure of Ru compounds. Natural bond orbitals (NBO) and quantum theory of atoms in molecules (QTAIM) were employed for analysis. The results showed that protonation can alter the properties and electron count of the Ru-Ru bond.
Article
Engineering, Chemical
Evgeny E. Tereshatov, Jonathan D. Burns, Amy L. Vonder Haar, Steven J. Schultz, Lauren A. McIntosh, Gabriel C. Tabacaru, Laura A. McCann, Geoffrey Avila, Andrew Hannaman, Kylie N. Lofton, Mallory A. McCarthy, Bowen Zhang, Michael B. Hall, Sherry J. Yennello
Summary: A detailed study has been conducted on the extraction of Bi and At from nitric acid media into conventional solvents, with a mathematical modeling used to fit experimental data and determine extraction and stability constants. A computational study was also performed to evaluate At interaction with the solvents.
SEPARATION AND PURIFICATION TECHNOLOGY
(2022)
Article
Chemistry, Physical
Thilina Gunasekara, Yicheng Tong, Amy L. Speelman, Jeremy D. Erickson, Aaron M. Appel, Michael B. Hall, Eric S. Wiedner
Summary: In this study, a detailed mechanistic study of electrocatalytic benzyl alcohol oxidation using a molecular nickel complex with pendant amines was conducted. The results showed that the coordination geometry of the catalyst has a significant impact on its activity, and the pendant amine only acts as a proton relay in the oxidation of a nickel hydride intermediate without affecting the overall reaction rate.
Article
Chemistry, Multidisciplinary
Pokhraj Ghosh, Molly Stauffer, Valiallah Hosseininasab, Subrata Kundu, Jeffery A. Bertke, Thomas R. Cundari, Timothy H. Warren
Summary: Copper nitrite reductases convert nitrite ions to nitric oxide and nitrous oxide at high levels of nitrogen oxide flux. The assembly of nitric oxide at a single copper site to form copper cis-hyponitrites has been demonstrated in the presence of an external reductant. Furthermore, the removal of a fraction of the structure in the copper cis-hyponitrite complex can be achieved by adding specific reagents, resulting in the formation of a spectroscopically similar anion. These studies provide insights into the reductive coupling of nitrogen oxides at a single copper center and the utilization of the strong oxidizing power of nitrite.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2022)
Article
Chemistry, Multidisciplinary
Taveechai Wititsuwannakul, Michael B. Hall, John A. Gladysz
Summary: This study investigates the mechanism of coupling between methylidene complexes and ethylene complexes using density functional theory. The formation of non-covalent dimers and the SRe/SRe pathway are found to be key steps in the reaction. The experimental results coincide with the theoretical calculations, highlighting the significance of this study in catalytic CH4 and CO/H2 chemistry.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2022)
Article
Chemistry, Multidisciplinary
Valiallah Hosseininasabl, Ida M. DiMucci, Pokhraj Ghosh, Jeffery A. Bertke, Siddarth Chandrasekharan, Charles J. Titus, Dennis Nordlund, Jack H. Freed, Kyle M. Lancaster, Timothy H. Warren
Summary: Nitrite anions (NO2-) can be reduced to nitric oxide (NO) and nitrous oxide (N2O) through Lewis acid coordination, forming borane-capped radical nitrite dianions (NO22-) with N(II) oxidation state. This system connects three redox levels in the global nitrogen cycle and provides insights into the conversion of NO2- to NO.
Article
Chemistry, Multidisciplinary
Md Estak Ahmed, Mahdi Raghibi Boroujeni, Pokhraj Ghosh, Christine Greene, Subrata Kundu, Jeffery A. Bertke, Timothy H. Warren
Summary: This study reports a novel copper catalyst for the oxidation of ammonia to dinitrogen under homogeneous conditions. The catalyst shows high efficiency and stability for ammonia oxidation under moderate overpotential. Mechanistic investigations reveal the involvement of oxidation and deprotonation processes in the catalytic transformation.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2022)
Article
Chemistry, Inorganic & Nuclear
Dragan B. Ninkovic, Salvador Moncho, Predrag Petrovic, Michael B. Hall, Snezana D. Zaric, Edward N. Brothers
Summary: This study explores a series of complexes derived from a titanium complex capable of activating C-H bonds under mild conditions. In addition to the initial activation of methane, the tautomerization reaction to a terminal methylidene is also investigated. The results predict that vanadium complexes are promising for methane C-H bond activation with low rate-determining barriers.
INORGANIC CHEMISTRY
(2023)
Article
Chemistry, Multidisciplinary
Manuel Quiroz, Molly M. Lockart, Shan Xue, Dakota Jones, Yisong Guo, Brad S. Pierce, Kim R. Dunbar, Michael B. Hall, Marcetta Y. Darensbourg
Summary: The reaction between nitrosylated-iron metallodithiolate ligand, paramagnetic (NO)Fe(N2S2), and [M(CH3CN)(n)][BF4](2) salts (M = Ni-II, Pd-II, and Pt-II; n = 4 or 6) results in the formation of di-radical tri-metallic complexes with a stairstep type arrangement. These isostructural compounds exhibit similar stretching values, isomer shifts, and electrochemical properties but different magnetic properties. Examination of the magnetic susceptibility, EPR, and DFT studies indicate the presence of antiferromagnetic coupling between {Fe(NO)}(7) units despite the relatively large intramolecular distances. The exchange coupling constants (J) of these compounds follow the trend of Ni-II < Pd-II << Pt-II, reflecting the increased covalency of the M-S bonds. DFT calculations further reveal the correlation between the magnitude of the exchange interaction and the energy difference between the HOMO and HOMO-1 orbitals of the triplet states, indicating the contribution of the central metal in this interaction. These findings highlight the role of sulfur-dense metallodithiolate ligands in facilitating strong magnetic communication through enhanced covalency and polarizability.
Article
Chemistry, Inorganic & Nuclear
Alexander L. Estrada, Taveechai Wititsuwannakul, Klemenz Kromm, Frank Hampel, Michael B. Hall, John A. Gladysz
Summary: This study investigates the reactions of Diphenyldiazomethane and [(eta(5)-C5H5)Re(NO)(PPh3)](+) BF4(-), as well as their reactions with copper powder and NaOCH3, resulting in different compounds. The properties of these compounds are studied through crystal structures and DFT calculations.
DALTON TRANSACTIONS
(2022)
Article
Chemistry, Inorganic & Nuclear
Yun Zhu, Andreas Ehnbom, Tobias Fiedler, Yi Shu, Nattamai Bhuvanesh, Michael B. Hall, John A. Gladysz
Summary: The study investigates the reactions and products of gyroscope-like complexes, showing the formation of different compounds with different ligands and reaction conditions. The stability of the compounds is discussed, with a focus on the role of a donor strengths of the non-phosphine ligands in the trends.
DALTON TRANSACTIONS
(2021)