Review
Chemistry, Physical
Siran Xu, Qi Wu, Bang-An Lu, Tang Tang, Jia-Nan Zhang, Jin-Song Hu
Summary: Green hydrogen is obtained through electrochemical water splitting using renewable energy sources. Its combustion produces only water, making it crucial for global energy transition. However, slow reaction kinetics in alkaline media hinder efficient hydrogen production. Understanding alkaline reaction kinetics is essential for achieving carbon neutrality.
ACTA PHYSICO-CHIMICA SINICA
(2023)
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
Goitom K. Gebremariam, Aleksandar Z. Jovanovic, Ana S. Dobrota, Natalia V. Skorodumova, Igor A. Pasti
Summary: This study demonstrates for the first time that the volcano-type relationships for hydrogen evolution are maintained across a wide range of pH values. The effects of anodic potential on hydrogen evolution over metal surfaces are discussed and can be used to tailor catalytic materials for different water electrolysis technologies.
Article
Energy & Fuels
Yuning Chen, Jiajun Liu, Li Feng
Summary: This study investigates the time-dependent behavior of a solar-based hydrogen production system using the TRNSYS program. The results show that hydrogen production is significantly influenced by seasonal climate changes, with the highest output power of photovoltaic panels in summer and spring. Limitations on storage tank volume restrict hydrogen production, particularly in summer. Increasing the tank volume and utilizing an increased discharge plan in summer can improve the productivity of the system.
Article
Chemistry, Physical
Jiao Li, Jianpeng Sun, Xiangchao Meng
Summary: Researchers successfully prepared a hollow spherical cobalt-based sulfide catalyst which exhibited excellent electrocatalytic activity and stability in the hydrogen evolution reaction (HER) in alkaline seawater. The catalyst's remarkable catalytic performance for HER in seawater splitting can be attributed to its hollow structure.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Green & Sustainable Science & Technology
Shihao Wei, Boris V. Balakin, Pawel Kosinski
Summary: This study proposes a novel method to efficiently utilize solar energy and economically produce hydrogen by electrolyzing electrolyte-based nanofluids under solar light. The addition of carbon black in the electrolyte enhances the hydrogen production rate by 23.62%. The optimal carbon black concentration varies depending on the experimental set-up, either 0.04% or 0.2%. A theoretical model is also developed, showing good agreement with the experimental results when the carbon black concentration is below 0.1 wt%.
JOURNAL OF CLEANER PRODUCTION
(2023)
Article
Energy & Fuels
Laura Perez Orosa, Eva Chinarro, Domingo Guinea, Maria C. Garcia-Alegre
Summary: This study presents the electro-oxidation of olive mill and biodiesel wastewaters in an alkaline medium, aiming to produce hydrogen and reduce organic pollution content. The experimental results confirm the production of hydrogen with different purity levels and the simultaneous reduction in organic contaminants.
Article
Energy & Fuels
Ioannis A. Poimenidis, Nikandra Papakosta, Argyro Klini, Maria Farsari, Michalis Konsolakis, Panagiotis A. Loukakos, Stavros D. Moustaizis
Summary: Nickel foam electrodes were treated with a cost-effective electrodeposition method to enhance hydrogen production in alkaline electrolysis setups. The treated electrodes showed improved electrochemical performance compared to bare nickel foam electrodes, and the deposition time played a crucial role in determining the hydrogen production efficiency. The 10-minute electrodeposited nickel foam electrode exhibited lower Tafel slope, lower overpotentials, and higher hydrogen production, mainly attributed to the increased electrochemically active area.
Article
Chemistry, Physical
Mariana C. O. Monteiro, Akansha Goyal, Pricilla Moerland, Marc T. M. Koper
Summary: This study investigates how the cation identity and concentration affect the kinetics of the hydrogen evolution reaction on platinum and gold electrodes. Weakly hydrated cations favor HER on gold at low overpotentials, while strongly hydrated cations exhibit higher activity in more alkaline pH conditions. The inhibition of HER by weakly hydrated cations is observed on platinum even at lower alkalinity and concentrations, suggesting a stronger interaction between platinum and metal cations.
Article
Chemistry, Physical
Qusay Hassan, Aws Zuhair Sameen, Hayder M. Salman, Marek Jaszczur
Summary: The study compares wind and solar solutions for large-scale production of green hydrogen, providing a precise technique and standardization for performance assessment. The findings show that the optimum electrolyser capacity can match the energy produced by the wind turbine power plant and solar photovoltaics power plant.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Environmental Sciences
L. Braga Nan, E. Trably, G. Santa-Catalina, N. Bernet, J-P Delgenes, R. Escudie
Summary: This study demonstrates that biomethanation processes can respond positively to intermittent H2 addition without compromising their CH4 production performance.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
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, Multidisciplinary
Kuanjian Zhang, Shaoxia Wang, Xinyue Li, Huihui Li, Yonghong Ni
Summary: In this work, a metastable Cu0.5Ni0.5 alloy with excellent performance for urea electrolysis was synthesized. The alloy showed good stability for hydrogen evolution reaction and rapid formation of NiOOH species during urea oxidation reaction. This work provides a simple and effective method for designing highly active bifunctional electrocatalysts for urea-supported water splitting.
Article
Chemistry, Physical
Liming Zeng, Tianxiang Yuan, Zerui Liu, Yongyang Zhu, Daifeng Wu, Dongxing Wang, Qing Zhou, Renheng Tang
Summary: In this study, a PtNi10/C alloy material with unique crystalline/amorphous structure supported on carbon black was deliberately designed and fabricated using a reversely rapid co-precipitation and mild thermal reduction strategy. The target catalyst exhibited low overpotential and fast kinetics rate for water dissociation, surpassing other catalysts and even commercial counterparts. The facile and rapid co-precipitation/thermal reduction strategy proposed in this study provides guidelines for designing high-efficiency alkaline HER catalysts.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2023)
Article
Chemistry, Multidisciplinary
Yu Duan, Xiao-Long Zhang, Fei-Yue Gao, Yuan Kong, Ying Duan, Xiao-Tu Yang, Xing-Xing Yu, Yan-Ru Wang, Shuai Qin, Zhi Chen, Rui Wu, Peng-Peng Yang, Xu-Sheng Zheng, Jun-Fa Zhu, Min-Rui Gao, Tong-Bu Lu, Zi-You Yu, Shu-Hong Yu
Summary: Interfacial engineering through the formation of nickel-vanadium oxide (Ni/V2O3) heterostructures can activate nickel for efficient hydrogen oxidation reaction (HOR) catalysis in alkaline fuel cells. The Ni/V2O3 interface acts as active sites, optimizing hydrogen and hydroxyl bindings and protecting metallic nickel from extensive oxidation, resulting in remarkable activity and durability.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Physical
Daniel Kehoe, Eric Mates-Torres, Pavel Samokhvalov, Max Garcia-Melchor, Yurii K. Gun'ko
Summary: Chirality is vital in various fields such as chemistry, biology, pharmacology, and medicine. Developing chiral nanomaterials is crucial for advancing selective and sensitive smart technology. Through ligand exchange, cysteine and L-glutathione can induce chiroptical activity in ultrathin AuAg nanomaterials, with different binding kinetics observed between the two ligands.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Chemistry, Inorganic & Nuclear
Yun Ji Park, Marconi N. Penas-Defrutos, Michael J. Drummond, Zachary Gordon, Oscar R. Kelly, Ian J. Garvey, Kelly L. Gullett, Max Garcia-Melchor, Alison R. Fout
Summary: In this study, the modification of the secondary coordination sphere in the non-heme iron system was explored to investigate the mechanism of nitrite reduction. The results showed that changing the secondary coordination sphere can alter the formation of iron-oxo and iron-hydroxo complexes, highlighting the key role of H-bonds in the stability of these species.
INORGANIC CHEMISTRY
(2022)
Article
Chemistry, Multidisciplinary
Alessandra Logallo, Manting Mu, Max Garcia-Melchor, Eva Hevia
Summary: This study reports a method for metalation agents via Co-H exchange, and it shows the regioselective cobaltation reaction of fluoroarenes can be achieved by controlling sodium amide, resulting in a new class of complexes.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Review
Chemistry, Physical
Michael John Craig, Max Garcia-Melchor
Summary: Using green hydrogen to reduce dependence on fossil fuels is important, but large-scale production is still not economical due to the cost and efficiency issues of electrocatalysts for the oxygen evolution reaction (OER). This mini-review outlines recent advances in the discovery and application of descriptors in OER catalysis, and discusses the challenges and opportunities in catalyst design strategies.
CURRENT OPINION IN ELECTROCHEMISTRY
(2022)
Article
Chemistry, Multidisciplinary
Guillermo Marcos-Ayuso, Marconi N. Penas-Defrutos, Ana M. Gallego, Max Garcia-Melchor, Jesus M. Martinez-Ilarduya, Pablo Espinet
Summary: This article discusses the method and importance of synthesizing aryl-alkynyl compounds. The traditional Sonogashira catalysis method is inefficient for fluorinated aryls, but an alternative method using alkynylstannanes and hemilabile PN ligands has been reported. The revision of literature reveals the existence of unreported byproducts and other factors that explain the conflict and provide clues for designing efficient alternatives for synthesizing the desired compounds.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Chemistry, Physical
Daire Tyndall, Michael John Craig, Lee Gannon, Cormac McGuinness, Niall McEvoy, Ahin Roy, Max Garcia-Melchor, Michelle P. Browne, Valeria Nicolosi
Summary: Nickel-iron layered double hydroxides are highly active catalysts for the oxygen evolution reaction, but their stability within the active voltage window is limited. This study identifies the source of catalyst instability by tracking changes in the material during OER activity. In-situ and ex-situ Raman analyses reveal long-term effects on catalyst performance due to crystallographic phase changes. Electrochemically stimulated compositional degradation and leaching of Fe metals from highly active edge sites are identified as the main causes of activity loss.
JOURNAL OF MATERIALS CHEMISTRY A
(2023)
Article
Chemistry, Physical
Manting Mu, Alessandra Logallo, Eva Hevia, Max Garcia-Melchor
Summary: This study reveals the electronic and steric requirements for the formation of tetraaryl Co(II) square planar complexes by using density functional theory and electronic structure analysis. The formation of these complexes depends on the balance between intramolecular and intermolecular interactions, and a "seesaw effect" is proposed as the mechanism for the ligand redistribution process.
Article
Chemistry, Multidisciplinary
Andreu Tortajada, Leonie J. Bole, Manting Mu, Martin Stanford, Marconi N. Penas-Defrutos, Max Garcia-Melchor, Eva Hevia
Summary: By using a sodium base in combination with the tridentate Lewis donor PMDETA and the sterically demanding electrophilic trap B(CH2SiMe3)(3), the deprotonative borylation of arenes can be achieved, resulting in the formal borylation of two equivalents of the relevant arene. The first B-C bond formation occurs through a sodiation/borylation sequence, while the second borylation step is facilitated by the formation of a borata-alkene intermediate.
Article
Chemistry, Physical
Michael John Craig, Felix Kleuker, Michal Bajdich, Max Garcia-Melchor
Summary: FEFOS method extracts formation energies from oxidation states by analyzing unary oxide formation energies and using fitted quadratic equations to determine element responses. It accurately predicts formation energies of binary oxides with low variance and high interpretability, performs well compared to state-of-the-art deep learning methods, and does not require biased training data or large computing resources.
CATALYSIS SCIENCE & TECHNOLOGY
(2023)
Article
Chemistry, Multidisciplinary
Carla Casadevall, Ava Lage, Manting Mu, Heather F. Greer, Daniel Anton-Garcia, Julea N. Butt, Lars J. C. Jeuken, Graeme W. Watson, Max Garcia-Melchor, Erwin Reisner
Summary: By using gel filtration size exclusion chromatography, successful size separation of carbon dots was achieved, and the effect of size on their photocatalytic performance was studied. The study found that monodisperse carbon dots exhibited higher activity in photocatalytic H2 evolution compared to the synthesized polydisperse samples.
Article
Chemistry, Multidisciplinary
Carla Casadevall, Ava Lage, Manting Mu, Heather F. Greer, Daniel Anton-Garcia, Julea N. Butt, Lars J. C. Jeuken, Graeme W. Watson, Max Garcia-Melchor, Erwin Reisner
Summary: This study investigates the performance of carbon dots (CDs) of different sizes in a photocatalytic system. Gel filtration size exclusion chromatography successfully separates the monodisperse CDs. The experiment demonstrates that the monodisperse CDs exhibit higher activity in photocatalytic hydrogen evolution compared to the polydisperse samples. This research reveals the size-dependent effect of CDs on photocatalytic performance.
Article
Chemistry, Multidisciplinary
Daniel C. Najera, Marconi N. Penas-Defrutos, Max Garcia-Melchor, Alison R. Fout
Summary: Agostic interactions were observed in iron compounds, and the strength of the interaction was influenced by the L-type ligand. Density functional theory calculations proved to be a powerful predictive tool in studying the nature of the interaction.
CHEMICAL COMMUNICATIONS
(2022)
Article
Chemistry, Multidisciplinary
Constantin D. Sahm, Anna Ciotti, Eric Mates-Torres, Vivek Badiani, Kamil Sokolowski, Gaia Neri, Alexander J. Cowan, Max Garcia-Melchor, Erwin Reisner
Summary: Sunlight-driven CO2 reduction to renewable fuels is a promising strategy in a circular economy. Colloidal quantum dots (QDs) have been explored as light absorbers that can enhance CO2 reduction through surface modification. This study shows that dithiols can activate the QD surface for CO2 reduction and suppress the competing H2 evolution reaction. Furthermore, by immobilizing a co-catalyst, a longer dithiol can accelerate CO2 reduction. The findings suggest that engineering the particle's chemical environment with dithiol capping ligands can enhance CO2 reduction catalysis.
Article
Chemistry, Physical
Kevin Brennan, Graeme W. Watson, Max Garcia-Melchor
Summary: The global population's reliance on ammonia has made the Haber-Bosch process one of the most studied processes in chemistry, yet electroreduction of N-2 still requires harsh conditions. Experimental and theoretical studies show that electroreduction of cyanide on a Ni cathode can produce methylamine as the major product, highlighting a potential alternative pathway for sustainable ammonia production under ambient conditions.
CATALYSIS SCIENCE & TECHNOLOGY
(2021)
