Article
Chemistry, Applied
Yongle Zhao, Huichen Xie, Wenwen Shi, Hong Wang, Chenyi Shao, Can Li
Summary: In this study, it was found that surface passivation with AlOx layer significantly improved the photoelectrochemical performance of Ta3N5 photoanode for water oxidation compared to TiOx layer modification. Mechanism study revealed that the negative charges on AlOx layer promoted the separation of photogenerated charges, leading to enhanced hole extraction and transfer efficiency.
JOURNAL OF ENERGY CHEMISTRY
(2022)
Article
Materials Science, Multidisciplinary
Yeongchan Choi, Heeju Son, Khabib Khumaini, Hyunmin Han, Hyeonsu Roh, Hye-Lee Kim, Sang-Ick Lee, Won-Jun Lee
Summary: In this study, silicon oxide films were deposited using a chlorine-free silylamine precursor and ozone by atomic layer deposition (ALD). The precursor DTDN-2H2 showed a significantly higher growth rate compared to tris-DMAS, with good step coverages at temperatures of 350-400 degrees C. The stoichiometric SiO2 films prepared at 400 degrees C exhibited low leakage current density and oxide-trapped charge density.
JOURNAL OF MATERIALS CHEMISTRY C
(2022)
Article
Materials Science, Multidisciplinary
Ernesto Garcia, Martin Flores-Martinez, L. P. Rivera, Edgar Enrique Camps-Carvajal, Stephen Muhl
Summary: This study investigates the effects of Zr addition on the morphological, structural, chemical composition, mechanical, and tribological properties of TaN films deposited on Ti6Al4V and Si substrates using DC magnetron co-sputtering. The addition of Zr resulted in a columnar morphology and a preferential (111) plane of the c-TaN phase, along with reduced hardness and elastic modulus values. Additionally, the failure modes and load capacity properties were modified, while the wear rate decreased with the addition of Zr to the TaN matrix.
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
(2023)
Article
Chemistry, Physical
Chun-Lin Su, Kogularasu Sakthivel, Yu-Tsun Yao, Po-Hsun Liao, Ming-Lun Lee, Jinn-Kong Sheu
Summary: This article discusses a new method to improve the water-splitting efficiency of gallium nitride photoelectrodes using alkali-treated NiOx films. The study shows that NiOOH formed on the NiOx/n-GaN surface can act as an electrocatalyst to promote carrier transportation kinetics on GaN photoanodes. By using this method, the photocurrent density is increased, and a significant H-2 production rate is achieved.
ACS APPLIED ENERGY MATERIALS
(2021)
Review
Biotechnology & Applied Microbiology
Xi Wang, Wentao Liu, Xinding Yu, Biyao Wang, Yan Xu, Xu Yan, Xinwen Zhang
Summary: This paper provides a systematic review of the research progress in tantalum surface modification, including the physicochemical properties, biological performance, and surface modification technologies of tantalum and porous tantalum.
FRONTIERS IN BIOENGINEERING AND BIOTECHNOLOGY
(2022)
Article
Physics, Applied
Silke A. Peeters, Ciaran T. Lennon, Marc J. M. Merkx, Robert H. Hadfield, W. M. M. (Erwin) Kessels, Marcel A. Verheijen, Harm C. M. Knoops
Summary: This work demonstrates that ultrathin superconducting TaCxN1-x films can be prepared using plasma-enhanced atomic layer deposition (PEALD) with substrate biasing. The ion-energy control enables tuning of the composition, improves film quality, and shows clear dependence of the critical temperature of superconductivity on ion energy.
APPLIED PHYSICS LETTERS
(2023)
Article
Green & Sustainable Science & Technology
Ruihao Gong, Dariusz Mitoraj, Dandan Gao, Manuel Mundszinger, Dieter Sorsche, Ute Kaiser, Carsten Streb, Radim Beranek, Sven Rau
Summary: This study presents a triadic photoanode for visible light-driven water oxidation, demonstrating the successful coupling of CNx with TiO2 and CoPOM catalysts. The use of PEI as a linker significantly improves the efficiency of hole transfer to water molecules and oxygen evolution during the reaction.
ADVANCED SUSTAINABLE SYSTEMS
(2022)
Article
Chemistry, Multidisciplinary
Carolina Pulignani, Camilo A. Mesa, Sam A. J. Hillman, Taylor Uekert, Sixto Gimenez, James R. Durrant, Erwin Reisner
Summary: Carbon nitride (CNx) is a promising light-absorber, but its activity in photoelectrodes has been limited. In this study, a co-deposition method using ITO nanoparticles and cyanamide-functionalized CNx was used to enhance the activity of CNx photoelectrodes. The results showed that ITO acted as a conductive binder and improved electron extraction, while the alumina underlayer reduced recombination losses. The resulting film demonstrated excellent performance in selective oxidation.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Chemistry, Multidisciplinary
Huafan Zhang, Jung-Hong Min, Tae-Hoon Chung, Kwangjae Lee, Paulraj Gnanasekar, Jung-Wook Min, Tae-Yong Park, Yue Wang, Tien Khee Ng, Udo Schwingenschlogl, Qiaoqiang Gan, Boon S. Ooi
Summary: This study presents a large-area crystalline-semiconductor nitride membrane with a distinct nanoporous surface for efficient and environmentally-friendly organic contaminant degradation in wastewater. The unique nanoporous surface enhances broadband light absorption and provides abundant reactive sites for dye-molecule reaction. The membrane exhibits remarkable dye degradation efficiency (>92%) and total organic carbon removal rate (approximately 50%) under both laboratory and rooftop sunlight test conditions.
Review
Chemistry, Analytical
Sze Shin Low, Zetao Chen, Yaru Li, Yanli Lu, Qingjun Liu
Summary: This review provides a comprehensive overview of the field of photoelectrochemical biosensing, with a focus on the design principles and synthesis methods of g-C3N4-based PEC biosensors. The review highlights the three design principles of g-C3N4-based PEC biosensors, providing researchers with comprehensive design guidelines.
TRAC-TRENDS IN ANALYTICAL CHEMISTRY
(2021)
Article
Chemistry, Physical
Georg Fickenscher, Lukas Fromm, Andreas Goerling, Joerg Libuda
Summary: In this study, the initial nucleation processes during atomic layer deposition (ALD) of HfS2 on a Co3O4(111) surface under ultrahigh-vacuum conditions were investigated. It was found that the initial half cycle of the ALD process consisted of several regimes, including the reaction of tetrakis(dimethylamido)hafnium (TDMAH) with mobile OD/D2O species on the surface, the formation of partially hydrolyzed Hf(NMe2)n(O)x(OD)m species, and the reaction between the partially hydrolyzed species and TDMAH until all OD groups are consumed. The density and dispersion of the Hf(NMe2)n(O)x(OD)m aggregates formed in the initial ALD half cycle were shown to depend dramatically on the growth temperature.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Chemistry, Physical
Georg Fickenscher, Lukas Fromm, Andreas Goerling, Joerg Libuda
Summary: In this work, the initial nucleation processes during atomic layer deposition (ALD) of HfS2 on an atomically defined Co3O4(111) surface were investigated under ultrahigh-vacuum conditions. The nucleation and growth steps were monitored using in situ infrared reflection absorption spectroscopy in combination with density-functional theory. The study reveals that the initial half cycle of the ALD process consists of several regimes and highlights the importance of controlling the nature and mobility of the OD/D2O aggregates on the surface.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Engineering, Biomedical
Xinglong Hu, Shiqi Mei, Fan Wang, Songchao Tang, Dong Xie, Chao Ding, Wenli Du, Jun Zhao, Lili Yang, Zhaoying Wu, Jie Wei
Summary: In this study, a microporous surface containing both silicon nitride (SN) and tantalum (Ta) microparticles on polyetherketoneketone (PEKK) creating excellent osteogenic and antibacterial activity. This surface significantly increased properties such as roughness, surface energy, hydrophilicity, and protein adsorption compared to sulfonated PEKK (SPK). The microporous surface of STP containing both SN and Ta particles induced cellular response and improved osseointegration, showing great potential as a bone substitute with dual biofunctions.
BIOACTIVE MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Rafael Uribe, Andrea Uvillus, Lenys Fernandez, Omar Bonilla, Angelica Jara, Gema Gonzalez
Summary: In this study, the electrochemical deposition of hydroxyapatite using simulated body fluid (SBF) as an electrolytic medium was carried out on BIOLINE stainless steel SS316LVM (SS). The best conditions for deposition were determined, and the structural and electrochemical characterization of the substrates were conducted. The results showed that the double layer Ta/TaN resulted in a more uniform and denser layer compared to SS alone.
Article
Materials Science, Multidisciplinary
Wei Dai, Yunzhan Shi
Summary: The properties of TaNx coatings are influenced by bias voltage, changing from composite structure to single structure as bias voltage increases. The coatings with Ta2N crystal exhibit enhanced hardness, adhesion strength, and tribological performance.
Article
Energy & Fuels
Guanyu Liu, Siva Krishna Karuturi, Hongjun Chen, Dunwei Wang, Joel W. Ager, Alexandr N. Simonov, Antonio Tricoli
Article
Chemistry, Physical
Bingqing Zhang, Shaochen Xu, Da He, Rong Chen, Yumin He, Wenjun Fa, Gonghu Li, Dunwei Wang
JOURNAL OF CHEMICAL PHYSICS
(2020)
Article
Multidisciplinary Sciences
Sufeng Cao, Yanyan Zhao, Sungsik Lee, Shize Yang, Jilei Liu, Georgios Giannakakis, Mengwei Li, Mengyao Ouyang, Dunwei Wang, E. Charles H. Sykes, Maria Flytzani-Stephanopoulos
Article
Chemistry, Multidisciplinary
Rong Chen, Cangjie Yang, Zefeng Zhou, Fredrik Haeffner, Alinda Dersjant, Nicholas Dulock, Qi Dong, Da He, Jing Jin, Yanyan Zhao, Jia Niu, Dunwei Wang
Summary: An electrochemical method for coupling biomass-derived C5/C6 compounds to value-added fuel precursors was reported. The reaction, which is not sensitive to oxygen and can be promoted by a trace amount of water, achieves high yield in a single step. Mechanistic studies confirmed radical generation through electrochemistry as the key to the reaction.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)
Article
Nanoscience & Nanotechnology
Keyan Li, Botong Miao, Wenjun Fa, Rong Chen, Jing Jin, Kirk H. Bevan, Dunwei Wang
Summary: This study presents an in situ method to probe the evolution of surface oxidation on photoanodes during active operation in aqueous solutions. Experimental and theoretical exploration indicate that changes in surface oxidation alter the carrier recombination and interfacial hole transfer rates, leading to a decrease in photocurrent. The methodology is expected to enhance understanding of surface oxidation on nonoxide semiconductor photoelectrodes and its impact on their operation.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Chemistry, Multidisciplinary
Haochuan Zhang, Jingru Luo, Miao Qi, Shiru Lin, Qi Dong, Haoyi Li, Nicholas Dulock, Christopher Povinelli, Nicholas Wong, Wei Fan, Junwei Lucas Bao, Dunwei Wang
Summary: In this research, stable SEI formation and reversible Li stripping/plating were achieved by introducing oxygen into triethyl phosphate. The method was validated in a nonflammable electrolyte and demonstrated control over dendrite formation.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)
Editorial Material
Chemistry, Physical
Victor Batista, Can Li, Wilson Smith, Dunwei Wang
JOURNAL OF CHEMICAL PHYSICS
(2021)
Article
Materials Science, Multidisciplinary
Cong-Xu Zhu, Han-Lu Zhang, Wen-Jun Fa, Feng-Wei Miao, Xiang-Qing Kong, Chun-Sheng Kong, Ming-Hua Feng, Yu Wang, Wei-Wei Li, Zhen-Li Huang, Zhi Zheng
Summary: This study focuses on the systematic research of nano-silver in ceramic glazes, analyzing the crystalline phase composition, micro-morphology, and elemental distribution of different color ceramic glazes produced by tuning nano-silver content and optimizing firing process. Glazes with varying Ag contents fired under reducing atmosphere showed blue-white, attributed to Rayleigh scattering, while those fired under air atmosphere exhibited golden-yellow due to silver nano-particles.
Article
Chemistry, Multidisciplinary
Chaochao Lang, Jingyi Li, Ke R. Yang, Yuanxing Wang, Da He, James E. Thorne, Seth Croslow, Qi Dong, Yanyan Zhao, Gabriela Prostko, Gary W. Brudvig, Victor S. Batista, Matthias M. Waegele, Dunwei Wang
Summary: By altering the water activity, researchers discovered that the mechanism of water oxidation is sensitive to the applied potential: a intramolecular oxygen coupling mechanism prevails at low driving force, while a water nucleophilic attack mechanism dominates at high driving force. This observed mechanistic switch has significant implications for understanding and controlling the water-oxidation reaction on heterogeneous catalysts.
Article
Nanoscience & Nanotechnology
Yang Wang, Tongtong Luo, Yang Li, Ailun Wang, Dunwei Wang, Junwei Lucas Bao, Udayan Mohanty, Chia-Kuang Tsung
Summary: The study investigated the chemical behavior and transport properties of an Mg(TFSI)(2)/DME electrolyte system inside Mg-MOF-74 using density functional theory. It was found that solvent and anion molecules occupy the open metal sites, while Mg2+ ions adsorb onto the carboxylate group of the MOF organic linker. The research demonstrated the validity of the computational strategies and provided molecular-level insights for fast and selective Mg2+ transport in Mg-MOF-74.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Review
Chemistry, Physical
Xiaogang Yang, Yuanxing Wang, Chang Ming Li, Dunwei Wang
Summary: This review summarizes current advances in studies on surface chemistry within the context of water oxidation, including intermediates, reaction mechanisms, and their influences on the reaction kinetics. It also outlines how multiple charge transfer relies on intermediate coverage and accumulated charge numbers. Density functional theories are used to discuss intermediates and rate-determining steps on some water oxidation catalysts.
Article
Chemistry, Multidisciplinary
Tangyuan Li, Qi Dong, Zhennan Huang, Lianping Wu, Yonggang Yao, Jinlong Gao, Xizheng Wang, Haochuan Zhang, Dunwei Wang, Teng Li, Reza Shahbazian-Yassar, Liangbing Hu
Summary: This study presents an interface engineering strategy for the synthesis of MEA-oxide-carbon hierarchical catalysts, which effectively addresses the interfacial stability issue and demonstrates superior catalytic performance and thermal stability.
ADVANCED MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Carlota Bozal-Ginesta, Reshma R. Rao, Camilo A. Mesa, Yuanxing Wang, Yanyan Zhao, Gongfang Hu, Daniel Anton-Garcia, Ifan E. L. Stephens, Erwin Reisner, Gary W. Brudvig, Dunwei Wang, James R. Durrant
Summary: The kinetics of water oxidation in molecular and heterogeneous catalysis differ due to the cooperative effects between oxidized iridium centers in heterogeneous catalysts. The specific coordination environment around the iridium centers in molecular catalysts allows for water oxidation without cooperative effects. These distinctions explain the differences in water oxidation electrocatalytic performance observed under different potential conditions.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2022)
Article
Chemistry, Physical
Benjamin P. Williams, Haochuan Zhang, Yu Mu, James R. Wilkes, Haden Wikar, Dunwei Wang
Summary: This article introduces several mechanisms that define the transport of ions through the solid-electrolyte interphase (SEI), and builds on these mechanisms with examples of their application in real battery systems. The aim is to provide a foundation of structure-property relationships for the rational design of stable SEIs that efficiently transport Li+ ions.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Chemistry, Multidisciplinary
Miao Qi, Haochuan Zhang, Qi Dong, Jingyi Li, Rebecca A. Musgrave, Yanyan Zhao, Nicholas Dulock, Dunwei Wang, Jeffery A. Byers
Summary: The redox-switchable polymerizations of lactide and epoxides were extended to the solid state by anchoring an iron-based polymerization catalyst to TiO2 nanoparticles, allowing for surface-initiated polymerization reactions that produced polymer brushes with composition dictated by the oxidation state of the complex. The electrically addressable surface formed by depositing catalyst-functionalized TiO2 nanoparticles on fluorine-doped tin oxide demonstrated spatial control in redox-switchable polymerization reactions and the potential for patterning surfaces with distinct polymer brushes featuring different physical properties.
