Article
Chemistry, Physical
Ying Duan, Pan Guo, Dong Sui, Dongsheng Deng, Tianliang Lu, Yanliang Yang
Summary: This article reports a method for preparing a catalyst for the hydrolysis of ammonia borane and characterizes the catalyst. By dispersing noble metals highly on the surface of Cu nanoparticles, the catalytic activity of the catalyst is significantly improved. Among them, the Rh catalyst exhibits the highest catalytic activity and the lowest activation energy.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Chemistry, Physical
Dihua Huang, Yiming Zhu, Binglong Mao, Jun Zhang, Quanxing Liu, Xiang Li, Kexing Song
Summary: Felicitously incorporating noble metals with transition metals to fabricate composite nanoagents with diverse shape and microarchitecture is a promising solution for obtaining highly effective catalysts. In this study, a facile and flexible synthesizing tactic, or Galvani substitution modulated self-assembly protocol, was used to fabricate Cu nanowire (core)-Pt nanoparticle (shell) microarchitecture (Cu-NWs@Pt) with a porous structure. The bimetallic nanowires with a Cu-Pt alloy sublayer and ordered Pt nanograins exhibited enhanced catalytic activity. The catalytic ability further increased with rising Pt/Cu molar ratios, and the Cu0.6Pt0.4 composition even exceeded Pt-NPs, maintaining 89% of the initial catalytic ability after 5 recycling runs. (c) 2022 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Chemistry, Physical
Xiaofa Su, Sifang Li
Summary: A new type of PVP-stabilized bimetallic Co-Ni nanoparticles as catalyst for hydrogen production from methanolysis of ammonia borane showed good catalytic performance, magnetic recyclability, and synergistic effect between Co and Ni.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Chemistry, Physical
Jiahuan He, Zhendong Yao, Xuezhang Xiao, Wenzheng Chen, Ziwei Huang, Xiulin Fan, Zhong Dong, Xu Huang, Xuancheng Wang, Man Chen, Lixin Chen
Summary: The Ni/NiO@MoOx catalyst synthesized in this study exhibits excellent catalytic activity in the hydrolysis of AB, with a high TOF value of 86.29 molH(2) molNi(-1) min(-1) at 298 K. The high Ni loading weight of the catalyst leads to a hydrogen generation rate of 10,478 mL.min(-1) g(-1), surpassing most values in both noble and non-noble metal catalysts. The bridging effect of NiO contributes to the durability of the catalyst, showing no significant degradation in the fifth cycle.
ACS APPLIED ENERGY MATERIALS
(2021)
Article
Chemistry, Physical
Yajun He, Guodong Pan, Liuyi Li, Shenghong Zhong, Lingyun Li, Zheyuan Liu, Yan Yu
Summary: By synthesizing a pyridine-functionalized covalent organic framework (COF), the stability and electronic density of platinum nanoparticles (Pt NPs) were enhanced, leading to improved catalytic activity in the hydrolysis of ammonia borane (AB) for hydrogen production. This study advances the application of covalent organic frameworks in heterogeneous catalysis.
CATALYSIS SCIENCE & TECHNOLOGY
(2022)
Article
Chemistry, Physical
Muhammad Asim, Alibek Kurbanov, Bushra Maryam, Muhammad Ajmal, Chenxiang Shi, Lun Pan, Ji-Jun Zou
Summary: Incorporating g-C3N4 with transition metal phosphides has the potential to create a low-cost and robust co-catalyst for hydrogen evolution. The ammonia borane hydrolysis method efficiently releases H2 in the presence of a catalyst under ambient conditions. A Ni2P/C3N4 catalyst is synthesized using a hydrothermal method and low-temperature phosphidation, and optimization reveals that the catalyst with 6.5% Ni content performs the best for H2 release. Furthermore, loading 2% Pt nanoparticles over Ni2P/C3N4 improves activity 5.7-fold and enhances charge transfer.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Chemistry, Multidisciplinary
Ruofan Shen, Yanyan Liu, Hao Wen, Xianli Wu, Guosheng Han, Xinzheng Yue, Sehrish Mehdi, Tao Liu, Huaqiang Cao, Erjun Liang, Baojun Li
Summary: The bimodal oxygen vacancy (V-O) catalysis strategy significantly enhances water dissociation on Pt nanoparticles, leading to the highest catalytic activity among Pt-based materials in ammonia borane hydrolysis. Theoretical simulation and characterization analyses reveal that the bimodal V-O promotes water dissociation in two ways: through an ensemble-inducing effect of Pt and V-O in TiO2, and through an electron promoter effect induced by electron transfer from V-O in NiOx to Pt. This insight establishes a new avenue for designing heterogeneous catalytic materials in the field of energy chemistry.
Article
Nanoscience & Nanotechnology
Yufa Feng, Xuefeng Zhang, Youxiang Shao, Xiaodong Chen, Huize Wang, Junhao Li, Ming Wu, Huafeng Dong, Quanbing Liu, Hao Li
Summary: In this study, uniform Mox-Ni0.8Cu0.2O nanowires were successfully fabricated as catalysts for ammonia borane (AB) methanolysis. The acidity of the catalysts' surface was flexibly modulated, leading to high catalytic activity. The relationship between the quantity of moderated acid sites and the activity of AB methanolysis was determined for the first time, and a plausible mechanism for the reaction was proposed.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Nanoscience & Nanotechnology
Shuyan Guan, Lulu An, Yumei Chen, Xianyun Liu, Jianchao Shi, Yulong Sun, Yanping Fan, Baozhong Liu
Summary: This study demonstrates the construction of an Fe-doped Ni/NiO nanocomposite film at an ionic liquid/water interface, showing improved catalytic activity for ammonia borane hydrolysis. The enhancing effect of Fe2+ doping on Ni/NiO films was confirmed, with the interfacial Ni-Fe2+ dual active sites playing a crucial role in the targeted adsorption and activation of water and NH3BH3 molecules. The exposed plane surface of the nanofilms provided abundant active sites for catalytic reactions, indicating a significant advance in the field of liquid hydrogen storage.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Chemistry, Physical
Yakun Song, Chunyuan Gao, Junhui Liu, Zhen Liu
Summary: The Co-based catalysts with multiatomic structure were designed for hydrolysis of ammonia borane reaction, and the synergistic effect between Co and Cu greatly enhanced the catalytic performance of bimetallic catalysts. The CoCu catalysts showed the strongest synergistic effect and highest catalytic activity for hydrogen generation, compared with CoNi and CoFe catalysts. This work provides a feasible method for rational design of efficient catalysts with hierarchical structure for conversion of energy.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Energy & Fuels
Tuba Top, Mehmet Yurderi, Ahmet Bulut, Necdet Karakoyun, Esra Ceylan, Mehmet Zahmakiran
Summary: This study developed carbon-supported bimetallic NiCo nanoparticles for H2 production in the methanolysis of AB for electricity generation from fuel cells. The catalytic properties of the Ni0.19Co0.81/C catalyst were evaluated in terms of different temperatures, metal loadings, substrate concentrations, and recyclability. The Ni0.19Co0.81/C catalyst exhibited good catalytic activity and maintained its initial activity and conversion rate after ten runs.
Article
Chemistry, Physical
Muhammad Asim, Shuguang Zhang, Bushra Maryam, Jie Xiao, Chengxiang Shi, Lun Pan, Ji-Jun Zou
Summary: A Pt@Ni2P catalyst is reported to enhance the hydrogen evolution rate from ammonia borane under both dark and visible light conditions. X-ray photoelectron spectrum analysis shows that the incorporation of Pt with Ni2P forms partially positive Pt delta+ and partially negative Ni2P delta- as active sites for ammonia borane and water, respectively. Visible light irradiation further accelerates the electron transfer from Pt delta+ to Ni2P delta-. Pt loading over Ni2P plays a vital role in improving the H2 evolution rate via ammonia borane hydrolysis.
APPLIED SURFACE SCIENCE
(2023)
Article
Green & Sustainable Science & Technology
Liqing Zhao, Qinghe Wei, Lili Zhang, Yafei Zhao, Bing Zhang
Summary: Efficient and inexpensive catalysts for hydrogen generation from solid-state ammonia borane (AB) hydrolysis are urgently desired for practical applications. Through the use of a bimetallic zeolitic imidazole framework (ZnCo-ZIF) template strategy, researchers successfully developed a high-efficiency NiCo-NC nano-catalyst for hydrogen production, showing remarkable catalytic performance and stability, and providing insights for further applications of bimetallic alloy anchoring on porous N-doped carbon carriers.
Article
Energy & Fuels
Dharman Ranjith Kumar, Samikannu Prabu, Kung-Yuh Chiang, Tae Hwan Oh
Summary: This study focuses on the efficient hierarchical catalysts for the hydrolysis of ammonia borane to produce hydrogen. The fabrication of hierarchical Co@Ni metal-organic framework nanocolumn arrays on nickel foam showed outstanding catalytic performance. The synergy between Co and Ni-MOF NCA was found to be the key factor contributing to the enhanced catalytic activity.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2022)
Article
Chemistry, Physical
Wei Cheng, Yumei Peng, Yi Wang, Weidong Jiang, Yan Long, Guangyin Fan
Summary: This study presents a method to fabricate high-performance Rh nanoparticles catalyst using an amino-group and space-confinement assisted strategy, significantly enhancing the catalytic performance for AB hydrolysis.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Chemistry, Physical
Fuzhu Liu, Chao Wu, Xiangdong Ding, Jun Sun
Summary: An atom deposition strategy is proposed to mitigate surface oxidation of metallic molybdenum, resulting in enhanced corrosion resistance by modulating the surface electronic structure.
APPLIED SURFACE SCIENCE
(2023)
Article
Chemistry, Multidisciplinary
Lu Li, Gengwei Zhang, Jingwen Xu, Huijie He, Bin Wang, Zhimao Yang, Shengchun Yang
Summary: By engineering the electronic structure of Nd0.1RuOx, the oxygen evolution activity in acidic solution can be enhanced, and the dissolution of ruthenium can be effectively suppressed, thus providing a design strategy for active and durable catalysts in proton exchange membrane electrolyzers.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Chemistry, Physical
Yaoyao Linghu, Tianyue Tong, Chao Wu
Summary: A newly developed CO reduction catalyst, Cu-MSN, consisting of low dimensional material MoSi2N4 doped with one Cu atom, is proposed in this study. The catalyst exhibits high efficiency for carbon chain upgradation with negligible kinetic barrier, and can generate valuable C2+ chemicals.
APPLIED SURFACE SCIENCE
(2023)
Article
Chemistry, Physical
Yaoyao Linghu, Tianyue Tong, Chao Wu
Summary: Cu-doped MoSi2N4 monolayer (Cu-MoSi2N4) was proposed for analyzing adsorption performances of common gas molecules via DFT and NEGF. The calculations showed that Cu-MoSi2N4 monolayer has high sensitivity for CO, NO, NO2, and NH3 molecules. It was found that NH3 adsorbs on Cu-MoSi2N4 monolayer with moderate strength and desorbs at room temperature, suggesting its potential as an NH3 sensor.
Review
Chemistry, Multidisciplinary
Ahsan Ali, Longbin Chen, Muhammad Salman Nasir, Chao Wu, Baolin Guo, Yaodong Yang
Summary: This article reviews an overlooked method, piezocatalysis, for degrading organic pollutants and inhibiting bacteria. Recent research has shown significant progress in the properties of piezoelectric materials, allowing for efficient charge carrier generation and fast reactions mediated by reactive oxygen species. The paper discusses the properties of piezoelectric materials, methods for water treatment, and the piezocatalytic mechanism with a focus on charge generation, cavitation, and bacterial inactivation by reactive oxygen species. Applications for dye and pathogenic bacteria removal are also presented.
ENVIRONMENTAL CHEMISTRY LETTERS
(2023)
Article
Chemistry, Physical
Junyi Yin, Pengqi Hai, Yuan Gao, Zihan Gan, Chao Wu, Yonghong Cheng, Xin Xu
Summary: Sodium-ion batteries (SIBs) are potential candidates for large-scale energy storage, and the design of better anode materials is crucial for improving their electrochemical performance. This study presents a conceptually novel TMH anode that exhibits superior rate capability and enhanced pseudocapacitive response due to its high crystallinity and nanostructure. The integration of theoretical predictions with experimental investigations provides insights into the rational design of effective anodic materials for SIBs.
Article
Chemistry, Physical
Tianyue Tong, Yaoyao Linghu, Chao Wu
Summary: Here, we investigate the CO2 capture ability of transition metal-modified 1T'-MoS2 monolayers (TM@1T'-MoS2) under external electric fields using first-principles calculations. The results show that Mo@1T'-MoS2, Cu@1T'-MoS2, and Sc@1T'-MoS2 monolayers exhibit higher sensitivity to electric fields compared to pristine 1T'-MoS2. Among these candidates, Mo@1T'-MoS2 and Cu@1T'-MoS2 monolayers can reversibly capture CO2 with an electric field strength of 0.002 a.u. and absorb up to four CO2 molecules with an electric field of 0.004 a.u. Additionally, Mo@1T'-MoS2 can selectively capture CO2 from a mixture of CH4 and CO2. Our findings provide insights into the beneficial synergistic effect of electric field and transition metal doping for CO2 capture and separation, as well as guide the application of 1T'-MoS2 in gas capture.
Article
Energy & Fuels
Mamutjan Tursun, Chao Wu
Summary: This study investigates the activities of single-point defective 1T'-MoX2 (X = S, Se, Te) monolayers for electrocatalytic nitrogen reduction and nitric oxide reduction. The results show that both vacancy and antisite defects can serve as active sites, with antisite defects performing better for nitrogen reduction reaction and vacancy defects performing better for nitric oxide reduction reaction. The catalysts also exhibit selectivity towards ammonia production. The activity difference among the catalysts is mainly attributed to steric hindrance and electronic properties represented by work function.
Article
Chemistry, Physical
Zihan Gan, Lei Liu, Pengqi Hai, Long Li, Yuan Gao, Junyi Yin, Mingyan Li, Chao Wu, Wei Ai, Yonghong Cheng, Xin Xu
Summary: By studying the influence of crystallinity on the storage performance of Na+ in MoS2, it is found that MoS2 with higher crystallinity exhibits better high-rate Na+ storage performance and stronger pseudocapacitive response.
JOURNAL OF POWER SOURCES
(2023)
Article
Engineering, Chemical
Longbin Chen, Pengqi Hai, Yaodong Yang, Chao Wu, Yongming Hu, Wei-Feng Rao
Summary: Combining metal with ferroelectrics is an effective strategy to significantly improve the photocatalytic water splitting efficiency of ferroelectrics. In this study, we fabricated SrBi4Ti4O15 (SBTO) nanosheets and deposited different quantities of Pt nanoparticles to form heterojunctions, aiming to find the optimal Pt loading ratio. The optoelectronic characterizations confirmed that the Pt-modified SBTO nanosheets exhibited broadened absorption of visible light and generated more long-lived charge carriers. The photocatalytic hydrogen production reached 11700 μmol g(-1) with continuous illumination for 3 hours from the sample containing 6 wt% Pt, which demonstrated a much higher hydrogen evolution rate compared to other ferroelectric materials in similar reaction systems. Our work provides a valuable and feasible solution for hydrogen production from water.
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
Article
Chemistry, Physical
Yaoyao Linghu, Tianyue Tong, Chao Wu
Summary: In this study, a MoSe2 catalyst doped with various transition metals was designed and screened. Ru@WS2 was found to be the best catalyst for the reduction of CO2 to methane. Additionally, the introduction of transition metals in VIB transition metal dichalcogenides was found to generate different products during CO(2) reduction. This study is of great significance for the exploration of reducing CO2 to methane.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Materials Science, Multidisciplinary
Bin Wang, Huijie He, Fanfan Shang, Bei An, Xiaoqian Li, Peng Li, Weitong Wang, Shengchun Yang
Summary: Due to their sluggish kinetics, it is urgent to develop highly efficient anode materials for electrocatalytic oxygen evolution reactions. In this work, Ce-doped amorphous Ni(OH)x was constructed on Cu(OH)2 nanorods via electrodeposition. The Ce dopant facilitated charge transfer from Ni to O, resulting in Ni3+ with a higher valence state that served as active sites with more intrinsic activity. Additionally, the Ce dopant reduced charge transfer resistance, leading to faster charge transport during the OER process. The obtained sample exhibited excellent OER performance with an overpotential of 225 mV at 10 mA cm-2 and stable operation at 100 mA cm-2 for 50 h.
Article
Materials Science, Multidisciplinary
Rui Li, Mamutjan Tursun, Yongjun Jiang, Qi Zhan, Shangdong Ji, Wei Bi, Chaoqi Wang, Yaming Liu, Sheng Dai, Chao Wu, Mingshang Jin
Summary: A new synthesis method for PdPt alloy nanoframe catalysts with ridges composed of rugged surfaces with high-density, low-coordination sites is reported. The nanoframe structure endows the low-coordination sites with excellent catalytic stability, preventing dissolution, migration, and aggregation during catalysis. The nanoframes exhibit superior catalytic activity and stability in the oxygen reduction reaction, methanol oxidation reaction, and ethanol oxidation reaction.
ACS MATERIALS LETTERS
(2023)
Article
Chemistry, Physical
Pengqi Hai, Chao Wu, Xiangdong Ding, Yuanjie Li
Summary: The thermodynamic and kinetic behaviors of F and O adatoms on typical Al surfaces have been systematically investigated. The results show that there is attraction between F-O pairs on the Al(111) surface, while repulsion exists between F adatoms. At low temperature and low coverage, F adatoms are dispersed in the hexagonal islands of O adatoms, leading to serious surface deformation as coverage increases. The study also reveals that F adatoms have easier migration on the surface and penetration into the subsurface compared to O adatoms.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
Article
Chemistry, Physical
Pengqi Hai, Chao Wu, Xiangdong Ding, Yuanjie Li
Summary: The adsorption and dissociation of H2O on Al surfaces, including crystal planes and nanoparticles, were studied through density functional theory (DFT) calculations. The adsorption strength of H2O follows the order ANPs > Al(110) > Al(111) > Al(100). The energy barrier for H2O decomposition into H* and OH* is higher on ANPs compared to crystal planes, and it decreases with increasing cluster size.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(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)
