Article
Chemistry, Physical
Umit Ecer, Adem Zengin, Tekin Sahan
Summary: Proposing a novel catalyst, Co@P4VPGB@PMC, for catalytic hydrolysis of metal hydrides, the study investigates the effect of various parameters using response surface methodology (RSM). The synthesized catalyst is characterized using various techniques. The hydrogen generation rate is found to be 4499 mL/min gcat under specific conditions.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Chemistry, Physical
Faezeh Mirshafiee, Mehran Rezaei
Summary: In this study, cobalt nanocatalysts supported on Fe3O4@GO were synthesized and used to enhance hydrogen generation from the hydrolysis of sodium borohydride. The Co/Fe3O4@GO catalysts showed high catalytic activity, with a hydrogen generation rate of 4000 mL/min.gcat and good stability when loaded with 30 wt% cobalt. The Box-Behnken design under response surface methodology (RSM) was employed to investigate the effect of parameters on the hydrogen generation rate and identify the optimal reaction conditions. The Co/Fe3O4@GO catalyst exhibited a superior H2 generation rate of 6005 mL/min.gcat and low activation energy of 44.4 kJ/mol under the optimized conditions of temperature, catalyst loading, and NaBH4 concentration. The Co/Fe3O4@GO catalyst holds promise for NaBH4 hydrolysis due to its easy preparation and separation method, high hydrogen generation rate, and low activation energy.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Chemistry, Physical
Ran Li, Hao Shi, Jinlin Song, Zihong Dong, Tao Wan, Hua Dong
Summary: In this study, a magnetically separable catalyst for promoting NaBH4 hydrolysis was developed by anchoring cobalt nanoparticles on magnetic dendritic KCC-1 nanospheres. The catalyst exhibited high catalytic activity under alkaline conditions and showed good recyclability. This development provides a promising option for portable hydrogen production.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Chemistry, Physical
Ashok D. Ugale, Neha P. Ghodke, Gil-Seon Kang, Ki-Bong Nam, Sudha Bhoraskar, Vikas L. Mathe, Ji Beom Yoo
Summary: This study synthesized carbon loaded cobalt oxide (C-Co3O4) for hydrogen generation via NaBH4 hydrolysis using the simple and economical process of combustion. The effects of NaBH4 concentration, pH, and temperature on hydrogen generation were investigated, revealing zero order reaction kinetics for C-Co3O4. A stable Hydrogen Generation Rate (HGR) was observed in the temperature range of 300-315 K, with a maximum HGR of 5430 ml min(-1) g(-1) at 320 K. The activation energy for NaBH4 hydrolysis using C-Co3O4 was calculated to be 55.9 kJ mol(-1).
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Chemistry, Physical
O. V. Netskina, E. S. Tayban, V. A. Rogov, A. M. Ozerova, S. A. Mukha, V. I. Simagina, O. V. Komova
Summary: In the study, it was found that cobalt catalysts are more active than nickel catalysts in the hydrolysis of sodium borohydride. One reason for the lower activity of nickel catalysts is the presence of hydrogen on its surface, which interferes with reactant adsorption. The addition of cobalt to nickel catalysts can enhance hydrogen generation rate.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Chemistry, Physical
Ran Li, Fengming Zhang, Jiapeng Zhang, Hua Dong
Summary: A Co/HTNT catalyst is developed by immobilizing Co on the surface of titanate nanotubes. The microstructure and composition of the catalyst are investigated, confirming its excellent catalytic performance in NaBH4 hydrolysis.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Chemistry, Physical
smit Ecer, Adem Zengin, Tekin Sahan
Summary: A novel catalyst, cross-linked gel brush-cobalt (0) composite (Co@P4VPGB@PMC), has been synthesized for efficient hydrogen generation from NaBH4 solution. The morphology, structure, and composition of the catalyst have been characterized using various techniques. Response surface methodology (RSM) was employed to investigate the key parameters (NaBH4 concentration, NaOH amount, catalyst amount, and temperature) affecting the hydrolysis of NaBH4. The hydrogen generation rate (HGR) reached 4499 mL/min gcat for Co@P4VPGB@PMC under optimized conditions.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Chemistry, Physical
Shuqing Zhou, Yuting Yang, Wanyu Zhang, Xianfa Rao, Puxuan Yan, Tayirjan Taylor Isimjan, Xiulin Yang
Summary: This study demonstrates a process for preparing a cobalt phosphide-supported Ru particulate nanocatalyst with abundant phosphorus vacancies, which shows excellent catalytic performance and high hydrogen generation rate in NaBH4 hydrolysis. The optimized catalyst has the lowest activation energy and good reusability.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2021)
Article
Chemistry, Physical
Valentina G. Minkina, Stanislav I. Shabunya, Vladimir I. Kalinin, Vladimir V. Martynenko
Summary: This study investigated the catalytic hydrolysis of aqueous NaBH4 solutions and found that the catalyst used showed stable catalytic activity. It was also observed that conducting the hydrolysis under near adiabatic conditions significantly reduced the hydrolysis time.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Chemistry, Physical
Jing Jiang, Shiyu Yang, Huili Lei, Lunhong Ai
Summary: Porous carbon nanostructures as supports can stabilize highly dispersed metal nanoparticles and facilitate mass transfer in reactions; catalytically active porous structures were synthesized and characterized for the efficient catalytic hydrolysis of NaBH4; the prepared Co@NC-600 sample shows high activity due to the catalytically active metallic Co and suitable support effect of N-doped carbon.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Engineering, Chemical
Fang Li, Jia Li, Luyao Chen, Yanmei Dong, Pinhong Xie, Qiming Li
Summary: A stable and efficient supported CoB catalyst with excellent catalytic performance and cycling stability has been successfully developed for hydrogen production from NaBH4 hydrolysis. The as-prepared CoB/PANI composite catalyst exhibits high hydrogen production rate and low activation energy, showing great potential in practical applications.
JOURNAL OF THE TAIWAN INSTITUTE OF CHEMICAL ENGINEERS
(2021)
Article
Chemistry, Physical
Neslihan Erat, Gamze Bozkurt, Abdulkadir Ozer
Summary: This paper presents the catalytic effect of Co doping on different oxide supports (single, bimetallic, and trimetallic) for the hydrolysis of NaBH4 aqueous solutions. The Co/CuO-NiO-Al2O3 catalyst shows high reaction activity at 25 degrees C and exhibits good reusability.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Environmental Sciences
Fuad Ameen, Aysenur Aygun, Abdullah Seyrankaya, Rima Nour Elhouda Tiri, Fulya Gulbagca, Idris Kaynak, Najwa Majrashi, Raha Orfali, Elena Niculina Dragoi, Fatih Sen
Summary: Various impurities in water pose a threat to human health. This study focuses on the use of Fe3O4@MnO2 nanocomposite to remove organic contaminants like rhodamine B (RhB) and Escherichia coli (E. coli) from water. The nanocomposite exhibits strong photocatalytic activity against pollutants, with a 90% destruction rate of E. coli and a 75% degradation rate of RhB. Additionally, the nanocomposite shows promising catalytic efficiency in hydrogen production.
ENVIRONMENTAL RESEARCH
(2023)
Article
Chemistry, Physical
Umit Ecer, Adem Zengin, Tekin Sahan
Summary: The synthesis and characterization of a polymer-supported catalyst for hydrogen generation using NaBH4 have been investigated. The catalyst loaded with cobalt nanoparticles showed good stability and recyclability in the hydrolysis reaction of NaBH4.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Chemistry, Physical
Yuxin Li, Guolang Zhou, Jingzhou Yin, Jianmei Chen, Chao Tang, Cheng Liu, Qiaoqi Li, Tianshi Wang, Feng Li, Chao Yao, Lili Zhang
Summary: This study successfully synthesized a series of catalysts with photo-thermal effect for hydrogen generation from sodium borohydride. Among them, Co6FeAl-LDH showed the best photo-thermal performance and activation energy reduction effect.
APPLIED SURFACE SCIENCE
(2023)
Article
Materials Science, Composites
Faheem A. Sheikh, Mushtaq A. Beigh, Abdul S. Qadir, Shabir H. Qureshi, Hern Kim
POLYMER COMPOSITES
(2019)
Article
Chemistry, Applied
Gracita M. Tomboc, Medhen W. Abebe, Anteneh F. Baye, Hern Kim
JOURNAL OF ENERGY CHEMISTRY
(2019)
Article
Chemistry, Physical
Pramod V. Rathod, Rajendra B. Mujmule, Wook-Jin Chung, Amol R. Jadhav, Hern Kim
Article
Engineering, Environmental
Richard Appiah-Ntiamoah, Anteneh F. Baye, Bekelcha T. Gadisa, Medhen W. Abebe, Hern Kim
JOURNAL OF HAZARDOUS MATERIALS
(2019)
Article
Chemistry, Multidisciplinary
Chosel P. Lawagon, Grace M. Nisola, Rosemarie Ann I. Cuevas, Hern Kim, Seong-Poong Lee, Wook-Jin Chung
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
(2019)
Article
Engineering, Chemical
Chosel P. Lawagon, Grace M. Nisola, Rosemarie Ann I. Cuevas, Rey Eliseo C. Torrejos, Hern Kim, Seong-Poong Lee, Wook-Jin Chung
SEPARATION AND PURIFICATION TECHNOLOGY
(2019)
Article
Electrochemistry
Gracita M. Tomboc, Hern Kim
ELECTROCHIMICA ACTA
(2019)
Article
Materials Science, Multidisciplinary
Zhander Vohr Soreno, John Marc C. Puguan, Hern Kim
MATERIALS CHEMISTRY AND PHYSICS
(2020)
Review
Chemistry, Multidisciplinary
K. Koteshwara Reddy, Harshad Bandal, Moru Satyanarayana, Kotagiri Yugender Goud, Kauveri Vengatajalabathy Gobi, Tippabattini Jayaramudu, John Amalraj, Hern Kim
Article
Chemistry, Physical
Atul A. Pawar, Harshad A. Bandal, Hern Kim
Summary: The study demonstrated a composite electrode prepared on nickel foam with high catalytic activity for oxygen evolution reaction (OER), exhibiting low overpotential and high current density, showing comparable intrinsic catalytic activity to commercial RuO2 catalyst.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Review
Chemistry, Multidisciplinary
Harsharaj S. Jadhav, Harshad A. Bandal, Seeram Ramakrishna, Hern Kim
Summary: Designing and constructing low-cost electrocatalysts with high activity and stability is challenging. This review focuses on metal-organic frameworks (MOFs) as precursor materials for efficient electrocatalysis. Different synthesis approaches and strategies to enhance activity and stability are discussed. The review also provides insights into the applications of MOFs in oxygen and hydrogen evolution reactions and overall water splitting.
ADVANCED MATERIALS
(2022)
Article
Electrochemistry
Harshad A. Bandal, Atul A. Pawar, Hern Kim
Summary: Researchers have found that waste onion skins can be transformed into an electrocatalyst for the OER with excellent activity and stability. The core-shell structure and the synergistic interplay among its components contribute to its performance.
ELECTROCHIMICA ACTA
(2022)
Article
Chemistry, Analytical
Manoj M. Rajpure, Harshad A. Bandal, Harsharaj S. Jadhav, Hern Kim
Summary: In this study, a multifunctional electrocatalyst NiCo-MOF-P was developed, which exhibited significantly enhanced electrocatalytic activity through structural and electronic modification. The optimized electrocatalyst showed excellent performance and long-term stability for urea-assisted water splitting.
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
(2022)
Article
Chemistry, Physical
Harshad A. Bandal, Hern Kim
Summary: This study successfully developed an efficient and stable Fe3O4/NF electrocatalyst by depositing Fe3O4 particles on nickel foam using the Schikorr reaction. Fe3O4/NF exhibited excellent catalytic activity in the urea oxidation reaction, reducing the cost of H-2 production and offering a solution for urea-rich wastewater treatment.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2022)
Article
Chemistry, Physical
H. A. Bandal, Hern Kim
Summary: Substituting the water oxidation reaction with the urea oxidation reaction can reduce the cost of H2 generation and provide a pathway for wastewater treatment. However, an efficient and stable catalyst is needed to overcome the kinetic limitations of the urea oxidation reaction (UOR).
APPLIED SURFACE SCIENCE
(2023)
Article
Chemistry, Physical
J. Zamora, T. Bautista, N. S. Portillo-Velez, A. Reyes-Montero, H. Pfeiffer, F. Sanchez-Ochoa, H. A. Lara-Garcia
Summary: Experimental and DFT studies were conducted on the structural, magnetic, and optical properties of RFeO3 perovskites. The perovskites exhibited an orthorhombic crystal structure and weak ferromagnetic behavior. They were confirmed to be semiconductors with a bandgap of approximately 2.1 eV.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Xianxiang Lv, Jing Jin, Weiguang Yang
Summary: By depositing TiN and TiO2 surface layers on AlSi films, the electrochemical performance of silicon-based anodes can be significantly improved, suppressing volume expansion and promoting the formation of a stable SEI layer.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Sharafat Ali, Haider Ali, Syedul Hasnain Bakhtiar, Sajjad Ali, Muhammad Zahid, Ahmed Ismail, Pir Muhammad Ismail, Amir Zada, Imran Khan, Huahai Shen, Rizwan Ullah, Habib Khan, Mohamed Bououdina, Xiaoqiang Wu, Fazal Raziq, Liang Qiao
Summary: The construction and optimization of redox-heterojunctions using a bifunctional phosphate as an electron-bridge demonstrated significant improvements in photo catalytic activity, including enhanced dispersion, reduced interfacial migration resistance, and increased abundance of active-sites.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Ren-Ni Luan, Na Xu, Chao-Ran Li, Zhi-Jie Zhang, Yu-Sheng Zhang, Jun Nan, Shu-Tao Wang, Yong-Ming Chai, Bin Dong
Summary: Extensive research has revealed that oxygen evolution reaction (OER) in alkaline conditions involves dynamic surface restructuring. The development and design of sulfide/oxide pre-catalysts can reasonably adjust the composition and structure after surface reconstruction, which is crucial for OER. This study utilized a simple two-step hydrothermal method to achieve in situ S leaching and doping, inducing the composition change and structure reconstruction of CoFe oxides. The transformed FeOOH and CoOOH exhibited excellent OER activity and could be easily mass-produced using low-cost iron based materials and simple methods.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Jun'an Lai, Daofu Wu, Peng He, Kang An, Yijia Wang, Peng Feng, WeiWei Chen, Zixian Wang, Linfeng Guo, Xiaosheng Tang
Summary: Zero-dimensional organic-inorganic metal halides (OMHs) are gaining attention in the fabrication of light-emitting diodes due to their broad emission band and high photoluminescence quantum yield. This work synthesized a zero-dimensional organic tetraphenylphosphonium bismuth chloride (TBC) that showed efficient blue light emission, with the emission mechanism attributed to the transition of Bi3+ ions. White light-emitting diodes (WLEDs) were fabricated using TBC, along with green-emitting and red-emitting single crystals, achieving single-component white emissions. These findings demonstrate the different emission mechanism of ns2 ions-based OMHs and highlight the potential of bismuth-based OMHs in WLEDs applications.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Xuewei Liang, Yunhai Su, Taisen Yang, Zhiyong Dai, Yingdi Wang, Xingping Yong
Summary: The revolutionary design concept of high-entropy alloys has brought new opportunities and challenges to the development of advanced metal materials. In this work, AlCrCuFe2NiTix high-entropy flux cored wires were prepared by combining the design idea of a high-entropy alloy with the characteristics of flux cored wire. AlCr-CuFe2NiTix high-entropy surfacing alloys were prepared using gas metal arc welding technology. The wear properties of the alloys were analyzed, and the phase composition, microstructure, strengthening mechanism, and wear mechanism were discussed. The results show that the alloys exhibit a dendritic microstructure with BCC/B2 + FCC phases. Increasing Ti content leads to the precipitation of Laves phase. The alloys show improved microhardness and wear resistance due to the precipitation of coherent B2 and Laves phases. However, excessive Ti addition results in the increase of Laves phase and reduced wear resistance of the alloys.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
M. Vadivel, M. Senthil Pandian, P. Ramasamy, Qiang Jing, Bo Liu
Summary: This work presents the enhanced photocatalytic and electrochemical performance of g-C3N4 assisted PAA on CoFe2O4 ternary nanocomposites. The incorporation of PAA and g-C3N4 improves the separation efficiency of photogenerated charge carriers, resulting in superior photocatalytic degradation and high specific capacitance values.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Vibhu T. Sivanandan, Ramany Revathy, Arun S. Prasad
Summary: In this study, pure and doped cobalt ferrite nanoparticles were prepared using the sol-gel auto-combustion method with the aid of lemon juice as eco-fuel. The crystal structure, lattice parameter, crystallite size, microstrain, optical parameters, and room temperature magnetic properties of the samples were analyzed. The effect of doping on the magnetic properties was also investigated.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Qing Guo, Bowen Zhang, Benzhe Sun, Yang Qi
Summary: This study prepared ZnO films with various nonpolar preferred orientations using conventional chemical bath deposition method and characterized their growth process and mechanism. It was found that the type and concentration of nitrate could control the preferred orientation and surface roughness of ZnO films. Additionally, ZnO films with different preferred orientations exhibited different optical properties.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Chong Zhang, Yan Liu, Zhaoyan Wang, Hang Yang
Summary: In this study, six bimetallic FeCo particles were synthesized via the hydrothermal method at different Fe:Co ratios. The Fe:Co ratio not only modulates the composition of the particles but also influences their structure and magnetic properties. The FeCo alloys showed a transformation from an Fe-based structure to a Co-based structure with increasing Co content. The Fe:Co ratio of 1:1 and 3:1 resulted in particles with the highest and lowest saturation magnetization, respectively.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Jianning Zhang, Jing Li, Yiren Wang, Xiaodong Mao, Yong Jiang
Summary: We conducted a study on the formation of ultra-fine Y-Ti-Ta-O nano-oxides in Ta+B micro-alloyed 13CrWTi-ODS alloys using electron microscopy and first-principles calculations. The Y-Ti-Ta-O nano-oxides were found to be mainly Y2(Ti,Ta)2O7, with an average size of 7 nm and a number density of 6.8 x 1023 m-3. Excess boron was found to enhance the adhesion of some low-sigma grain boundaries but weaken the Fe/Y2Ti2O7 interface, while excess tantalum enhanced the Fe/Y2Ti2O7 interface but caused serious degradation of grain boundaries.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Yirong Fang, Pei Cheng, Hang Yuan, Hao Zhao, Lishu Zhang
Summary: A new composite system of nitrogen-doped reduced graphene oxide and black phosphorus quantum dots has been developed for tumor therapy, showing improved electrochemical properties and stability. The system generates hydrogen peroxide and hydroxyl radical to effectively kill tumor cells.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Xiufang Qin, Yuanli Ma, Hui Zhang, Ting Zhang, Fang Wang, Xiaohong Xu
Summary: The structure and magnetism of cobalt ferrites after Mn2+-Tb3+ co-doping were studied. Co-doped samples exhibited cubic spinel structure and spherical shape of ferrite nanoparticles. The redistribution of Co2+ and Fe3+ ions between octahedral and tetrahedral sites was observed due to Mn2+-Tb3+ co-doping. The coercivity and magnetization saturation of co-doped samples were significantly improved, leading to a maximum energy product that is 190% higher than that of the un-doped sample.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Ho Yeon Lee, Wonjong Yu, Yoon Ho Lee
Summary: Recently, there has been an increasing interest in developing ultra-fine nanostructured electrodes with extensive reaction areas to enhance the performance and low-temperature operation of solid oxide fuel cells. The use of a refined approach involving co-sputtering metal alloys and oxide targets has demonstrated the feasibility of nano-columnar structures in perovskite-based electrodes, expanding the temperature range of thin film electrodes. This study systematically examines the effects of chamber pressure control in the co-sputtering process and identifies the intricate relationship between sputtering pressure and film structure. By fine-tuning the columnar growth in the electrode, significant improvements in performance and thermo-mechanical properties were achieved, resulting in high-performance all-sputtered solid oxide fuel cells.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Qianyun Bai, Xiaoxiao Yan, Da Liu, Kang Xiang, Xin Tu, Yanhui Guo, Renbing Wu
Summary: This study proposes a simple method to develop a non-precious transition metal-based electrocatalyst with high catalytic activity and robustness for the hydrogen evolution reaction. The as-synthesized electrode exhibits a low overpotential and high current density, indicating its potential in energy conversion.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)