Article
Nanoscience & Nanotechnology
Chunlin Liu, Xuechuan Wang, Hui Jie Zhang, Xiangyu You, Ouyang Yue
Summary: Flexible energy storage materials and sensors play a crucial role in human-machine interface technology. This study focuses on the development of gelatin-based PPy hydrogel electrodes through template degradation method, resulting in enhanced electrochemical performance. The H-Gel/AS-MWCNTs-PPy electrode exhibits improved capacitance when immersed in an ammonium sulfate solution, leading to the assembly of a flexible sensor and solid-state supercapacitor with high performance.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Materials Science, Multidisciplinary
Fen Zhu, Xiao She, Zhanhui Zhang, Xianghua Yu, Jiayou Ji, Liang Li, Shaoping Li
Summary: In this study, flexible free-standing films with remarkable flexibility and excellent electrochemical properties were successfully prepared. These films can be used for fabricating portable and wearable supercapacitors and exhibit stable electrochemical performance even after multiple bending cycles, making them suitable for manufacturing wearable devices, portable electronics, and healthcare monitoring applications.
DIAMOND AND RELATED MATERIALS
(2024)
Article
Chemistry, Multidisciplinary
Songjie Wang, Yongyin Liang, Wenchen Zhuo, Hang Lei, Muhammad Sufyan Javed, Botian Liu, Zilong Wang, Wenjie Mai
Summary: A high mass loading and freestanding CNT@PPy electrode was fabricated, demonstrating superior areal capacitance and improved mechanical properties, leading to enhanced performance for supercapacitors.
MATERIALS CHEMISTRY FRONTIERS
(2021)
Article
Engineering, Environmental
Glaydson Simoes dos Reis, Ravi Moreno A. Pinheiro Lima, Sylvia H. Larsson, Chandrasekar Mayandi Subramaniyam, Van Minh Dinh, Mikael Thyrel, Helinando Pequeno de Oliveira
Summary: This study developed biomass-based supercapacitors for application in advanced electronic devices with flexible structures, achieving promising results in terms of areal capacitance, energy density, power density, and cycle retention after 1000 cycles. By varying the amount of polypyrrole during its polymerization process, the competition between activated carbon and the hybrid device was controlled, showing the potential for improved performance in flexible membrane-like supercapacitors.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)
Article
Chemistry, Physical
Pengzhen Wang, Xinxin Du, Xingjian Wang, Kewei Zhang, Jianhua Sun, Zhe Chen, Yanzhi Xia
Summary: This study developed an integrated fiber electrode based on marine polysaccharide for constructing high-energy symmetrical fiber-shaped supercapacitors, demonstrating outstanding capacity and flexibility.
JOURNAL OF POWER SOURCES
(2021)
Article
Engineering, Electrical & Electronic
Lu Wang, Ying-Hua Zhou, Xiaoheng Liu
Summary: Carbon fibers' textile (CFT)-based flexible electrodes with SnO2 nanospheres and V2O5/SnO2 nanoparticles were prepared. The electrodes exhibited optimized mesoporous structure and high surface area. A solid-state flexible asymmetric supercapacitor was fabricated using these electrodes and showed high specific capacitance and good rate stability.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Polymer Science
Doebner Von Tumacder, Islam M. Minisy, Oumayma Taboubi, Patrycja Bober
Summary: The presence of organic dyes in the frozen-state polymerization of pyrrole has been found to significantly enhance the electroactivity and capacitance performance of polypyrrole (PPy). The PPy prepared under frozen conditions showed improved electrochemical stability and demonstrated excellent energy storage characteristics in a supercapacitor device.
Article
Chemistry, Physical
Wenzheng Li, Wei Chen, Linzheng Ma, Jing Yang, Meng Gao, Kunhua Wang, Hao Yu, Ruitao Lv, Min Fu
Summary: The rapid development of flexible supercapacitors (FSCs) is driven by the increasing demand for flexible and wearable electronic devices. Conductive hydrogels, which have good processability and electrochemical properties, are considered as promising electrode materials for FSCs. However, their practical applications are hindered by poor mechanical properties. In this study, a double-network polyvinyl alcohol (PVA)-polypyrrole (PPy) conductive hydrogel is synthesized, which not only enhances the mechanical properties of the hydrogel but also promotes electrolyte ion transport.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2023)
Article
Materials Science, Paper & Wood
Lingling Fan, Wenfeng Zheng, Yuan Yang, Yan Sun, Songlin Peng, Jie Xu, Guangfu Yin
Summary: Bacterial cellulose/polypyrrole nanofibrous composites have been extensively studied for supercapacitors due to their large specific surface area and excellent tensile strength. However, the structural pulverization of polypyrrole leads to inferior cycling stability. In this study, nanofibrous composite membranes of MXene, PPy, and oxidized bacterial cellulose were prepared for flexible supercapacitor electrodes, showing enhanced performance.
Article
Chemistry, Physical
Guixin Wang, Nuolan Jiang, Yuxin Xu, Zhouxiong Zhang, Guiling Wang, Kui Cheng
Summary: The article introduces a design strategy of combining reduced graphene oxide (rGO), MXene, and polypyrrole (PPy) into a flexible film electrode to address the automatic stacking and poor stability issues of 2D materials. The resulting rGO/MXene-PPy composite electrode exhibits high conductivity, robust mechanical properties, and pseudocapacitance. It also shows superior rate performance, remarkable cycling stability, and high energy/power densities. This work demonstrates the potential of the prepared rGO/MXene-PPy electrodes in flexible energy storage devices.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2023)
Article
Electrochemistry
Wenlong Luo, Yue Sun, Yongqin Han, Jianxu Ding, Tingxi Li, Chunping Hou, Yong Ma
Summary: MXene/polypyrrole (M-PPy) composite films were fabricated by vacuum-assisted suction filtration, and the optimized M-PPy3 exhibited high capacitance and excellent cycling performance. The flexible M-PPy3//MnO2 asymmetric supercapacitor showed high capacitance retention even after 6000 charge/discharge tests, demonstrating remarkable energy storage capacity. This study provides a better electrode structure for MXene and demonstrates its application in flexible wearable devices.
ELECTROCHIMICA ACTA
(2023)
Article
Chemistry, Multidisciplinary
Ruquan Ren, Yan Zhong, Xueyong Ren, Yongming Fan
Summary: This article introduces a one-step hydrothermal method to fabricate oxygen-doped activated carbon/graphene composite hydrogels. The composite hydrogels have low cost, high specific surface area, and high conductivity, making them suitable for flexible and wearable energy storage devices. They exhibit excellent energy storage performance and cycling stability.
Article
Electrochemistry
J. Vigneshwaran, Jemini Jose, Siby Thomas, Alessio Gagliardi, Mukundan Thelakkat, Sujin P. Jose
Summary: The energy storage performance of polypyrrole-based MXene nanocomposite electrode is studied, showing excellent specific capacitance and cycle performance. By fabricating quasi-solid-state supercapacitors, higher energy density and power density are achieved, with a wide operating potential window. This has significant implications for energy storage solutions.
ELECTROCHIMICA ACTA
(2022)
Article
Chemistry, Applied
Yan Sun, Yuan Yang, Lingling Fan, Wenfeng Zheng, Dezhan Ye, Jie Xu
Summary: This study developed a facile and efficient method to deposit anion-doped PPy onto positively charged SnCl2-modified BC using electrostatic self-assembly. The obtained PPy@SBC electrode exhibited high areal capacitance, desirable capacitance retention, and excellent cycling stability. A symmetric flexible supercapacitor assembled with the PPy@SBC electrodes demonstrated outstanding mechanical flexibility and stable performance.
CARBOHYDRATE POLYMERS
(2022)
Article
Chemistry, Physical
Quanlu Wang, Changxing Han, Guoxiang Tang, Lei Liu, Tingxi Li, Yongqin Han
Summary: Polymerization of polypyrrole (PPy) on the surface of ZnCo-MOF columnar structure is achieved using (NH4)2S2O8 and AgNO3 as co-oxidants. The resulting ternary composite material, ZnCo-MOF/PPy/Ag2O, demonstrates successful PPy polymerization, multifunctional properties of ARS, and catalytic oxidation of Ag. The MPA/Ag2O-4 electrode exhibits excellent specific capacitance, and an asymmetric supercapacitor assembled with MPA/Ag2O-4 and activated carbon shows high area capacitance and wide potential window. The composite material also displays outstanding cycling stability and flexibility, making it a promising candidate for flexible wearable and portable electronic devices.
JOURNAL OF ALLOYS AND COMPOUNDS
(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)