Article
Materials Science, Multidisciplinary
Sukomol Barua, Aldona Balciunaite, Jurate Vaiicuniene, Loreta Tamasauskaite-Tamasiunaite, Eugenijus Norkus
Summary: In this study, 3D nickel-manganese (NiMn) bimetallic coatings were used as electrocatalysts for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) in alkaline and acidic media. The NiMn coatings exhibited excellent HER activity in alkaline media with a low overpotential of 127.1 mV and exceptional OER activity in acidic media with a minimum overpotential of 356.3 mV. The electrocatalysts also showed good long-term stability and increased current densities with an increase in temperature.
Article
Engineering, Environmental
Le Chai, Shuling Liu, Shaotong Pei, Chao Wang
Summary: This paper presents a series of cobalt-nickel phosphide films electrodeposited on nickel foam substrates, exhibiting good catalytic activity in alkaline solutions for both the hydrogen evolution reaction and water oxidation reaction. The electrodes show low overpotentials and steep Tafel slopes, with potential applications in electrolyzing water for hydrogen production.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Chemistry, Inorganic & Nuclear
Qingyi Qian, Fan Wang, Xingkai Zhang, Qiuping Zhao
Summary: Nickel and cobalt films are phosphorized directly in alkaline hypophosphite solution under the action of electric current, resulting in significant changes in morphology and enhanced electrocatalytic performance for the hydrogen evolution reaction. In particular, the phosphorized nickel film shows an overpotential of 57 mV at a current density of 10 mA·cm(-2).
INORGANIC CHEMISTRY COMMUNICATIONS
(2021)
Article
Chemistry, Physical
D. S. Dmitriev, A. A. Lobinsky, V. Popkov
Summary: This study demonstrates the production of thin coatings with different morphologies of bimetallic NiCo system on carbon felt by adjusting the pH of the electrolyte. The electrochemical performance of the coatings was evaluated using various techniques, showing that a smooth NiCo(s) coating is more effective as an electrocatalyst for the hydrogen evolution reaction compared to a rough NiCo(r). Equivalent circuits of the NiCo system on carbon felt were calculated and modeled based on the EIS results.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2021)
Article
Chemistry, Physical
Yihui Wu, Zesheng Sun, Yuxin Wang, Li Yin, Zhen He, Zejie Zhang, Muhammad D. Hayat, Qianhao Zang, Jiqiong Lian
Summary: Developing efficient and low-cost bifunctional electrocatalysts for hydrogen evolution reaction (HER) and urea oxidation reaction (UOR) in urea-water-alkali electrolyzers is highly challenging. In this study, nickel-selenium electrocatalysts (Ni-Se) were grown on Ni foam through cyclic voltammetric electrodeposition for urea electrolysis. The optimized Ni-Se electrocatalyst exhibited excellent HER and UOR catalytic competence due to its good conductivity and high hydrophilic surface. In 1 M KOH with 0.33 M urea electrolyte, the Ni-Se electrocatalysts required an overpotential of 181 mV for HER and a potential of 1.347 V versus reversible hydrogen electrode for UOR to achieve a current density of 10 mAmiddotcm-2. The electrocatalyst showed good durability in both HER and UOR. Moreover, the electrolyzer assembled with Ni-Se electrocatalysts as electrode couple exhibited remarkable activity with a small cell voltage of 1.41 V for overall urea-water electrolysis.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Electrochemistry
Malarkodi Duraivel, Saravanan Nagappan, Kang Hyun Park, Kandasamy Prabakar
Summary: This article reports a low-cost and extremely stable bifunctional electrocatalyst for overall water splitting in alkaline medium. By using a simple hydrothermal method to grow self-supported transition metal oxide/hydroxides (including nickel hydroxide, manganese dioxide, and cobalt hydroxide) on a nickel foam substrate, low overpotential and high current density were achieved. Through long-term stability tests lasting 80 hours, the superior performance of these electrodes and their ability to replace expensive noble metals were demonstrated.
ELECTROCHIMICA ACTA
(2022)
Article
Chemistry, Physical
Sukomol Barua, Aldona Balciunaite, Jurate Vaiciunien, Loreta Tamasauskaite-Tamasiunaite, Eugenijus Norkus
Summary: In this study, NiMo/Ti and Au(NiMo)/Ti catalysts were prepared by electrodeposition and galvanic displacement method, and their catalytic performance for hydrogen evolution reaction (HER) was evaluated in an alkaline medium. The results showed that the Au(NiMo)/Ti-3 catalyst with an Au loading of 5.2 μg/cm^2 exhibited the lowest overpotential and the highest current density under certain metal loadings and temperature conditions.
Article
Energy & Fuels
Mehmet Erman Mert, Huseyin Nazligul, Emine Avsar Aydin, Basak Dogru Mert
Summary: In this study, a PV-wind hybrid system was proposed as a power source for alkaline electrolysis hydrogen production, and the electrocatalytic activity and electrochemical performance of lab-made 3D printed cathode substrates were characterized and analyzed.
Article
Chemistry, Analytical
Chenglong Jin, Mengyu Hou, Xi Li, Dan Liu, Deyu Qu, Yulin Dong, Zhizhong Xie, Chaocan Zhang
Summary: An efficient electrochemical method was used to fabricate Fe-doped Ni-Se on Ni foam substrate for water splitting. The unique 3D structure of the substrate and the hybrid Ni-Se materials contribute to the excellent electrocatalytic performance. The Fe4Ni-Se/NF electrode shows low overpotential, small Tafel slopes, and outstanding stability during continuous operation.
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
(2022)
Article
Chemistry, Physical
S. M. Pawar, Abu Talha Aqueel Ahmed, Chi Ho Lee, P. T. Babar, J. H. Kim, Sang Uck Lee, Hyungsang Kim, Hyunsik Im
Summary: This study presents a transition-metal (Mo, Fe)-codoped nickel phosphide (Ni3P:FeMo) bifunctional catalyst for enhanced overall water splitting in an alkaline medium. The catalyst showed outstanding electrocatalytic performance for both the hydrogen evolution reaction and oxygen evolution reaction, with low overpotentials and fast electrocatalytic kinetics.
ACS APPLIED ENERGY MATERIALS
(2021)
Article
Engineering, Environmental
Manjinder Singh, Thanh Tuan Nguyen, Jayaraman Balamurugan, Nam Hoon Kim, Joong Hee Lee
Summary: The study successfully designed a 3D hierarchical oxygenated nickel tungsten selenide nanostructure with excellent catalytic activity and durability through a low-cost hydrothermal process and partial controlled-selenization treatment.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Chemistry, Physical
Yuanpeng Qian, Mengliang Hu, Liping Li, Xuepeng Liu, Shuqi Cao, Chuigen Guo
Summary: A novel 3D self-supporting electrode of graphene oxide/nickel-cobalt/carbonized wood (GO/Ni-Co/CW) is developed, showing excellent catalytic activity and corrosion resistance, which provides an effective strategy for new nickel-based water electrolysis electrocatalysts.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Chemistry, Physical
Jiaxing Zhang, Aixiang Wei, Jun Liu, Jiali Zhu, Yuding He, Zhen Liu
Summary: In this study, a high-efficiency and low-cost bifunctional catalyst was prepared by depositing 2D CoFeLDH nanosheets on a self-supporting nickel sponge. The catalyst showed excellent electrocatalytic performances, including low overpotentials and high current densities, in alkaline solution.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Physical
Kota Ando, Yoshiharu Uchimoto, Takashi Nakajima
Summary: The irradiation of a single laser pulse onto the electrode assists the formation of bubbles, which can be used to probe the dissolved gas concentration on the electrode. The obtained concentrations agree well with inferred values through linear extrapolation of gas concentration in proximity to the electrode to the electrode surface.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Chemistry, Physical
Byung Keun Kim, Myung Jun Kim, Jae Jeong Kim
Summary: This study introduces pulse-reverse electrodeposition (PRED) as a method to improve the properties of nickel phosphorus (NiP) films and enhance the performance of hydrogen evolution reaction (HER) and oxygen evolution reaction (OER). The research explores the effects of electrochemical parameters in PRED on HER and OER activities, revealing that changes in the dissolution step of PRED have opposite impacts on these two activities. The study shows that increased dissolution amount during PRED enhances OER while decreasing HER activity. Mott-Schottky analysis suggests that the improvement in HER activity by adopting PRED is due to an increase in the reactivity of active sites. In contrast, the increase in OER activity is attributed to an increase in the number of active sites on the surface of NiP films caused by excess dissolution during PRED. Surface analyses indicate that the opposite responses of HER and OER are caused by different factors; the uniform formation of NiP governs HER activity, while the removability of phosphate determines the exposure of OER-active Ni oxide phases.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2022)
Article
Environmental Sciences
Rozina, Mabkhoot Alsaiari, Mushtaq Ahmad, Muhammad Zafar, Farid A. Harraz, Jari S. Algethami, Biljana Sljukic, Diogo M. F. Santos, Muhammad Saeed Akhtar
Summary: The depletion of non-renewable fuel has led researchers to explore sustainable and environmentally friendly alternatives. Membrane technology has been proven effective for biofuel production, offering advantages in reaction, purification, and separation processes. In this study, a membrane reactor was used to synthesize biodiesel from inedible seed oil, achieving a high yield of 95 wt% with the inclusion of a nano-catalyst made from leaf extract. The results demonstrate that membrane technology can intensify the reaction process and improve the economics of transesterification, leading to sustainable production.
Article
Construction & Building Technology
B. Sena da Fonseca, A. P. Ferreira Pinto, M. Rucha, M. M. Alves, M. F. Montemor
Summary: Consolidation improves the cohesion of stones and preserves stone-built heritage. However, it also modifies other characteristics that affect stone vulnerability to salt crystallization, especially in porous limestones. This study evaluates the compatibility of alkoxysilanes and phosphate-based treatments with a historic porous limestone in both short-term and medium/long-term perspectives. The findings reveal the potential risks of salt entrapment and development of subflorescences when using consolidants, highlighting the importance of addressing consolidation of damaged stones with proper compatibility.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Electrochemistry
A. C. Alves, Jorge P. Correia, Teresa M. Silva, M. F. Montemor
Summary: The birnessite structure of MnO2 makes it a promising electrode material for energy storage devices, especially supercapacitors, due to its high theoretical capacitance and pseudocapacitive response. The effect of alkali cations on the structure of birnessite has been discussed, but their role in the charge storage mechanism is still controversial. This study reveals new aspects of the pseudocapacitive charge storage mechanism of birnessite and discusses the contribution of non-faradaic and faradaic reactions based on EIS analysis. It demonstrates the role of alkali ions intercalation in the interlayer structure of birnessite.
ELECTROCHIMICA ACTA
(2023)
Review
Energy & Fuels
Ana P. R. A. Ferreira, Raisa C. P. Oliveira, Maria Margarida Mateus, Diogo M. F. Santos
Summary: There is a growing demand to reduce CO2 emissions and develop low-cost renewable fuels. CO2 conversion is gaining attention as it can help reduce CO2 accumulation and produce valuable chemicals. Meanwhile, finding ways to store energy, such as through electrolysis, is essential. Industrial wastewater treatment and bioenergy technology also show potential for producing valuable chemicals and treating wastewater. This paper comprehensively reviews these approaches and highlights the potential of electrolytic cells for energy and environmental applications.
Article
Chemistry, Physical
Dusan Mladenovic, Elif Das, Diogo M. F. Santos, Ayse Bayrakceken Yurtcan, Biljana Sljukic
Summary: A set of platinum and earth-abundant transition metals on graphene nanoplatelets (sqPtM/GNPs) was synthesized via sequential deposition to establish a correlation between the synthesis method and the materials' electrochemical properties. sqPtFe/GNPs showed the highest catalytic performance as bifunctional electrocatalysts for oxygen evolution (OER) and reduction (ORR) reactions. A novel two-stage synthesis strategy led to higher electrocatalytic performance by improving reactant accessibility and reducing charge-transfer resistance.
Article
Chemistry, Physical
Noha A. Elessawy, Gordana Backovic, Janesuda Hirunthanawat, Marta Martins, Lazar Rakocevic, Marwa H. Gouda, Arafat Toghan, Mohamed E. Youssef, Biljana Sljukic, Diogo M. F. Santos
Summary: In this study, PET bottle waste was transformed into nitrogen-doped graphene (NG) as a valuable catalyst support, and NG/Pt electrocatalysts were prepared for direct borohydride peroxide fuel cells (DBPFCs). The results show that NG/Pt catalysts display high catalytic activity, and a DBPFC using NG/Pt_1 catalyst achieved a high power density. This research has the potential to lower the cost of fuel cells and boost the usage of electrochemical energy devices.
Article
Chemistry, Inorganic & Nuclear
Afrah Bardaoui, Asma Hammami, Rabiaa Elkarous, Mohamed Ali Aloui, Rania Oueslati, Olfa Messaoud, Diogo M. F. Santos, Radhouane Chtourou
Summary: Understanding and regulating DNA interactions with solvents and redox-active centers can lead to improved electrochemical signals and biosensor development. This study presents the development of a graphene-modified indium tin oxide (ITO) electrode for double-stranded DNA detection. The modified electrode exhibited enhanced electrical conductivity and altered electrochemical response when the number of base pairs increased. The proposed method shows potential for replacing nucleic acid gel electrophoresis for DNA fragment detection and size quantification.
Article
Electrochemistry
Rodrigo Braga, Diana M. Fernandes, Alberto Adan-Mas, Teresa M. Silva, M. F. Montemor
Summary: The introduction of pillared agents or dopants to graphene in supercapacitor electrodes can improve ion transfer and electrochemical performance. This study evaluates the effect of different nitrogen (N) and sulfur (S) precursors on doped graphene flakes (GF). Co-doping with 4-amino-3-hydrazino-5-mercapto-1,2,4-triazole results in a specific capacitance of 48 F.g(-1) and over 90% capacitance retention after 10,000 cycles.
Article
Electrochemistry
R. S. Sampaio, T. M. Silva, M. F. Montemor
Summary: This work investigates the growth of manganese oxide on stainless steel for pseudocapacitor electrodes using a one-step potentiostatic method. The microstructure of the electrode material and its capacitive response were analyzed through in situ ellipsometry and electrochemical impedance spectroscopy. The results reveal the formation of three layers during the potentiostatic synthesis of manganese oxide on stainless steel: thickening of the native oxide layer on the substrate, and the growth of two distinct layers of manganese oxide. The inner layer is slightly more compact and resistive, while the outer layer is more porous.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2023)
Article
Chemistry, Inorganic & Nuclear
Souha Aouini, Afrah Bardaoui, Ana Maria Botelho do Rego, Ana M. Ferraria, Diogo M. F. Santos, Radhouane Chtourou
Summary: CoMn2O4 spinel was successfully synthesized on stainless steel mesh through a hydrothermal process, with a 24-h reaction time resulting in the desired structure, stoichiometry, and good crystallinity. The sample exhibited a tetragonal structure with Co-O and Mn-O vibrational bands and manganese and cobalt metal oxides on the surface. It showed promising electrochemical performance, making it suitable for practical energy storage devices, particularly in supercapacitor applications.
SOLID STATE SCIENCES
(2023)
Review
Polymer Science
Jayeeta Chattopadhyay, Tara Sankar Pathak, Diogo M. F. Santos
Summary: This review summarizes the applications and advantages of polymer electrolytes in lithium-ion batteries, and discusses the ion transport mechanisms, preparation methods, and recent advancements in specific battery systems. Moreover, it proposes strategies for developing novel polymer electrolytes for high-performance lithium-ion batteries.
Article
Green & Sustainable Science & Technology
Ana L. Santos, Maria Joao Cebola, Jorge Antunes, Diogo M. F. Santos
Summary: Green hydrogen production is the best route to achieve a sustainable alternative to fossil fuels, and the performance of the electrodes is crucial for electrolysis efficiency.
Editorial Material
Biochemistry & Molecular Biology
Clara Casado-Coterillo, Diogo M. F. Santos, Liliana C. Tome, Svetlozar Velizarov, Isabel Coelhoso, Jose Ignacio Calvo
Article
Chemistry, Inorganic & Nuclear
Gajendra Gupta, Filipe Gusmao, Anup Paul, Biljana Sljukic, Diogo M. F. Santos, Junseong Lee, M. Fatima C. Guedes da Silva, Armando J. L. Pombeiro, Chang Yeon Lee
Summary: This study describes the excellent electrocatalytic activity towards the oxygen evolution reaction (OER) in alkaline media using a new cobalt-based mixed-ligand metal-organic framework. The composites of the framework with different carbon materials showed enhanced OER performance, surpassing the benchmark electrocatalyst IrO2.
DALTON TRANSACTIONS
(2023)
Article
Energy & Fuels
Eduardo Enrique Martinez Jorges, Antonio M. N. Quintino, Diogo M. F. Santos
Summary: The increasing demand for electric vehicles and renewable energy generation has led to a growing industry of battery recycling and second-life battery applications, which offer environmental and economic benefits. This study compares the benefits, economic advantages, and disadvantages of battery recycling and evaluates different projects to determine the most viable industrial process. The analysis shows that the second-life battery project is the most economically viable option.
