Article
Chemistry, Multidisciplinary
Changyan Guo, Tao Wang, Li Zhang, Tingxiang Chen, Cheng Guo, Afaq Hassan, Naeem Akram, Yuli Kou, Jide Wang
Summary: By introducing defective linkers with different pKa values, Cu-BDC with different defect concentration and coordinatively unsaturated sites (CUS) content were designed and synthesized. The low-concentration defects enhance photocatalytic activity, while high-concentration defects decrease charge carrier transfer efficiency. Cu-BDC-FBA shows excellent bifunctional photocatalytic performance for water splitting.
Article
Chemistry, Multidisciplinary
Chong Wang, Hongxiang Xiao, Yichun Lu, Jinliang Lv, Zhanhui Yuan, Jiajia Cheng
Summary: Researchers have successfully synthesized crystalline carbon nitride material with well-developed structure by regulating polymerization kinetics. This material exhibits high crystallinity, nanosheet structure, and efficient charge-carrier transmission capacity, leading to higher photocatalytic activity compared to other materials. This study provides a novel strategy for the rational design and synthesis of high-performance carbon nitride photocatalysts by simultaneously optimizing polymerization kinetics and crystallographic structures.
Article
Materials Science, Multidisciplinary
Mohammad Ziaur Rahman, Jorge Gascon
Summary: Quantum efficiency (QE) is a crucial parameter for evaluating the efficiency of a photocatalyst. However, there is currently no experimental technique that can determine the sequence of charge transport events or directly determine QE from charge transport information. In this study, we propose a semi-empirical circuit model to determine the sequence of charge transport events and suggest hypotheses to differentiate the role of recombination and charge transfer in predicting QE. By testing with literature data, we demonstrate that this model can predict QE when the percentage of recombination is known and determine the sequence of charge transport events when QE is known.
Article
Materials Science, Multidisciplinary
R. L. Wilmington, H. Ardekani, A. Rustagi, A. Bataller, A. F. Kemper, R. A. Younts, K. Gundogdu
Summary: Research shows that two-dimensional transition metal dichalcogenides undergo an electron-hole liquid phase transition at high temperatures, leading to the evolution of electronic band structure. Using Fermi liquid theory, analysis of photoluminescence spectral evolution can reveal critical parameters and carrier behavior.
Article
Materials Science, Ceramics
Yongxia Li, Binsheng Yang, Bin Liu
Summary: Efficient visible-light-driven photocatalysts face challenges due to high charge recombination rates. The development of BiVO4 nanoparticles with controllable oxygen vacancy levels has shown a significant increase in photocatalytic efficiency, with the optimal oxygen vacancy level leading to a 38% improvement over pure BiVO4. Characterizations revealed that this increase was mainly due to the suppression of electron/hole recombination.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Ceramics
Wenhuan Liu, Pinjing Xu, Huimei Zhu
Summary: In this study, Bi12GeO20/Ag3PO4 nanowire composite exhibited significantly improved photocatalytic performance and stability, with a RhB dye decomposition efficiency reaching 94.2%. The presence of Ag3PO4 was found to enhance the generation of active species and increase the active surface area, leading to the improved photocatalytic performance.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Multidisciplinary
Timofey Maximov, I. L. Kurbakov, Nina S. Voronova, Yurii E. Lozovik
Summary: We develop a many-body theory of dipolar exciton-polaritons in an optical microcavity under both out-of-plane electric and in-plane magnetic fields. We discover the existence of two minima in the dispersion of bare lower-polaritons, leading to a tunable transition between polariton Bose-Einstein condensate and excitonic condensate. This dipolar condensate exhibits a unique excitation spectrum characterized by roton-maxon behavior. The transition between the two condensation regimes is accompanied by changes in correlations and photoluminescence. Additionally, our proposal suggests the possibility of manipulating superfluid properties and extended-range dipole-dipole correlations of exciton-polariton condensates.
Article
Chemistry, Inorganic & Nuclear
Lipsa Panda, Abanti Pradhan, EnketeswaraSubudhi, Binita Nanda
Summary: CaTiO3 was synthesized using a sol-gel method and decorated with different weight percentages of Ag on the surface using the wetness impregnation method (AgCTO). Characterization of the prepared catalyst showed improved morphology, optical properties, and activity in wastewater remediation. The loading of Ag reduced the band gap and extended the photocatalyst's range to the visible region, mainly due to the localized surface plasmon resonance effect (LSPR). The Schottky junction formed at the CaTiO3 and Ag contact effectively facilitated electron transport, reducing recombination of photoinduced electrons and holes.
INORGANIC CHEMISTRY COMMUNICATIONS
(2023)
Review
Chemistry, Physical
Weiping Yang, Jielin Wang, Ruimin Chen, Lei Xiao, Shujie Shen, Jieyuan Li, Fan Dong
Summary: This review summarizes the mechanism and methods of photocatalytic nitrate reduction, and discusses the challenges and future prospects of this technology.
JOURNAL OF MATERIALS CHEMISTRY A
(2022)
Article
Chemistry, Physical
Xiangrong Ma, Rui Dang, Ning Yang, Xiao Li, Ya Zhang, Ying Gong, Zhipan Liu, Wei Guo, Yuanyuan Zhang, Chunyan Li
Summary: The high cost of noble metal catalysts is a bottleneck for the industry, but using single-atom noble metals can reduce costs significantly. Single Pt atoms on Ag3VO4 were investigated for their impact on photocatalytic performance. The presence of Pt atoms on the surface of Ag3VO4 improved H-2 production efficiency under visible light, attributed to enhanced light utilization and reduced charge transfer resistance.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Multidisciplinary Sciences
Bin Zhao, Lingting Zeng, Danyang Chen, Songqing Xie, Zhaokui Jin, Guanglin Li, Wei Tang, Qianjun He
Summary: This study proposes a concept of photocatalytic regulation of the synovial microenvironment (SME) for arthritis treatment. Monodispersive hydrogen-doped titanium dioxide nanorods with a rutile single-crystal structure are developed to achieve near infrared-photocatalytic generation of hydrogen molecules and depletion of lactic acid (LA) in a collagen-induced mouse model of rheumatoid arthritis. The results show that locally produced hydrogen molecules scavenge reactive oxygen species and regulate the synovial microenvironment, thereby preventing synovial pannus formation and cartilage destruction.
Article
Materials Science, Multidisciplinary
Huihui Deng, Cunqi Qin, Kemei Pei, Guoyong Wu, Mei Wang, Huagang Ni, Peng Ye
Summary: In the catalytic process of semiconductors, the rapid recombination of electron-holes greatly reduces the catalytic activity. A low-defect reduced hydroxylated graphene (RGOH) was used as a carrier material to prepare TiO2/reduced hydroxylated graphene (T/RGOH) nanocomposite photocatalyst, which showed a higher degradation efficiency for methylene blue compared to pure TiO2 and TiO2/reduced graphene oxide (T/RGO) nanocomposite photocatalysts. The enhanced performance was attributed to the higher electrical conductivity of RGOH and the existence of Ti-O-C bonds in the T/RGOH, which improved electron-hole separation and prevented rapid recombination.
MATERIALS CHEMISTRY AND PHYSICS
(2021)
Article
Chemistry, Physical
Wei Wei, Haoyang Gong, Lin Sheng, Shuguang Zhu, Li Feng
Summary: Hollow cubic Cu2MoS4 nanoparticles were synthesized using a hydrothermal method, and Rh single atoms were loaded onto the surface to enhance photocatalytic efficiency. The study showed that Rh-loaded Cu2MoS4 catalysts have lower charge transfer resistance and higher charge transfer rate, allowing for multiple reuse without efficiency drop.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Physical
Mohadeseh Karimkhah, Amin Yourdkhani, Ehsan Moradpur-Tari, Reza Poursalehi, Rasoul Sarraf-Mamoory
Summary: Both experimental and computational approaches were used to investigate the effect of water of crystallization on the optical properties, band structure, and photocatalytic activity of tungsten oxide. WO3 center dot 2H(2)O showed better photocatalytic performance and stability compared to WO3 and WO3 center dot H2O. The presence of water of crystallization altered the crystal structure and hybridization with crystal atoms, leading to different band gap energies and electron-hole recombination rates.
SURFACES AND INTERFACES
(2021)
Article
Chemistry, Physical
M. Benlembarek, N. Salhi, R. Benrabaa, A. Boulahouache, M. Trari
Summary: The spinel NiFe2O4 prepared from nitrates precursors was characterized and found to have a cubic phase and a crystallite size of 19 nm. It exhibited a close stoichiometry to NiFe2O4 catalyst calcined at 900°C. The material's optical properties and photo-electrochemical behavior were suitable for solar-driven hydrogen production. Under optimal conditions, it showed a high H2 evolution rate of 46.5 mmol g^-1 min^-1 with minimal deactivation.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Nanoscience & Nanotechnology
Joon Woo Park, Woong Choi, Juhwan Noh, Woonghyeon Park, Geun Ho Gu, Jonghyeok Park, Yousung Jung, Hyunjoon Song
Summary: Alloy formation is an advanced approach that improves properties beyond what monoelements can achieve. The Au-Ag alloy nanostructures exhibit prominent catalytic properties in the electrochemical carbon dioxide reduction reaction (eCO(2)RR), with superior performance compared to pure elements. The optimal configuration of the active intermediate *COOH involves a bidentate coordination structure where C binds to Au and O binds to Ag, in agreement with experimental results. This study offers new insights into the synergistic roles of Au and Ag in eCO(2)RR and provides a direction for rational design of bimetallic catalysts.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Multidisciplinary
Ji Yong Choi, John Flood, Michael Stodolka, Hoai T. B. Pham, Jihye Park
Summary: By transforming 2D conjugated MOFs into 3D frameworks via postsynthetic pillar-ligand insertion, increased ion accessibility and improved gravimetric capacitance were achieved.
Article
Chemistry, Physical
Woong Choi, Seongho Park, Wonsang Jung, Da Hye Won, Jonggeol Na, Yun Jeong Hwang
Summary: A catholyte-free MEA is proposed for electrochemical CO2 reduction. Water management is critical for its catalyst-membrane interface. The study finds that protons for ethylene mainly come from the anolyte, and humidification of CO2 affects the efficiency and current density. Mass transport of CO2 and water limits the performance of the MEA.
ACS ENERGY LETTERS
(2022)
Article
Nanoscience & Nanotechnology
Michael Stodolka, Ji Yong Choi, John Flood, Hoai T. B. Pham, Jihye Park
Summary: In this study, an Fe-based two-dimensional conductive metal-organic framework with redox features and mesoporosity was reported. The framework exhibits high electrical conductivity and capacitance, making it a potential candidate for chemical sensing and energy storage applications.
ACS APPLIED NANO MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Hoai T. B. Pham, Ji Yong Choi, Shaofeng Huang, Xubo Wang, Adam Claman, Michael Stodolka, Sadegh Yazdi, Sandeep Sharma, Wei Zhang, Jihye Park
Summary: The development of 2D electrically conductive metal-organic frameworks (EC-MOFs) has expanded the applications of MOFs. This study presents a new EC-MOF with a large surface area, high electrical conductivity, and tunable particle size. The framework also utilizes functional groups to host heterometal ions, providing new opportunities for expanding the library of EC-MOFs and exploring electronic applications.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2022)
Article
Chemistry, Multidisciplinary
Ji Yong Choi, Minyan Wang, Brianna Check, Michael Stodolka, Kyle Tayman, Sandeep Sharma, Jihye Park
Summary: This article reports the synthesis of Cu-3(HAB)(x)(TATHB)(2-x) with improved crystallinity and higher electrical conductivity compared to previous studies. The ligand compositions in the framework are precisely controlled by precursor ratios. The electrical conductivity can be tuned by increasing the nitrogen content in the crystal lattice. Computational calculations support the idea that the solid solution facilitates band structure tuning. These findings shed light on the structure-property relationship and open new possibilities for synthesizing electrically conductive metal-organic frameworks (MOFs) for optoelectronic device applications.
Article
Chemistry, Physical
Seok Hwan Yang, Wonsang Jung, Hyeonggeon Lee, Sang-Hun Shin, Seung Jae Lee, Min Suc Cha, Woong Choi, Seong-Geun Oh, Ki Bong Lee, Ung Lee, Da Hye Won, Jang Yong Lee
Summary: This study demonstrates the commercial viability of a polycarbazole-based anion-conducting material, HQPC-tmIM, as an anion exchange membrane for electrochemical CO2 reduction (eCO2R). The research also reveals through simulation that the well-constructed membrane morphology of HQPC-tmIM leads to outstanding membrane conductivity and enables high CO partial current density. The findings provide guidelines for developing commercially viable anion exchange membranes and ionomers for eCO2R.
ACS ENERGY LETTERS
(2023)
Article
Chemistry, Physical
Hyewon Yun, Woong Choi, Dongwoo Shin, Hyung-Suk Oh, Yun Jeong Hwang
Summary: Tailoring catalyst performance in zero-gap MEA electrolyzers is crucial. However, few studies have directly focused on MEA systems combined with operando techniques. This study demonstrates improved catalytic performance of AuAg bimetallic catalyst by adjusting the atomic arrangement and extrinsic properties. The catalyst achieved high CO selectivity and CO partial current density and mass activity through proper adjustment of the carbon support.
Article
Chemistry, Multidisciplinary
Bumjin Park, Won-Woo Park, Ji Yong Choi, Woong Choi, Young Mo Sung, Soohwan Sul, Oh-Hoon Kwon, Hyunjoon Song
Summary: In this study, the effect of morphology and surface nature of Pt cocatalysts on photocatalytic hydrogen evolution activity in Pt-tipped CdSe nanorods was investigated. The rough tips exhibit the highest activity, followed by the round and cubic tips. The cubic tips exhibit lower charge-separated states feasible for reacting with water and water reduction rates due to their defectless surface facets.
Article
Chemistry, Physical
Seok Hwan Yang, Wonsang Jung, Hyeonggeon Lee, Sang-Hun Shin, Seung Jae Lee, Min Suc Cha, Woong Choi, Seong-Geun Oh, Ki Bong Lee, Ung Lee, Da Hye Won, Jang Yong Lee
Summary: This study demonstrates the key roles of HQPC-tmIM, a polycarbazole-based anion-conducting material, in electrochemical CO2 reduction (eCO2R) and reveals its commercial viability as an anion exchange membrane (AEM). The superior performance of HQPC-tmIM in terms of mechanical/chemical stability and CO partial current density (jCO) in a membrane electrode assembly electrolyzer (MEA) was shown compared to a commercial AEM (Sustainion). The multiphysics model simulation reveals that the well-constructed membrane morphology of HQPC-tmIM enables high jCO through facilitated charge transfer.
ACS ENERGY LETTERS
(2023)
Article
Chemistry, Physical
Younghyun Chae, Kyeongsu Kim, Hyewon Yun, Dongjin Kim, Wonsang Jung, Yun Jeong Hwang, Ung Lee, Dong Ki Lee, Byoung Koun Min, Woong Choi, Da Hye Won
Summary: The study investigates the impact of substrate on the performance of the electrochemical CO2 reduction reaction. It reveals that a porous carbon paper substrate facilitates CO2 supply and diffusion, leading to higher efficiency in CO2RR.
JOURNAL OF MATERIALS CHEMISTRY A
(2023)
Article
Chemistry, Multidisciplinary
Suhyun Lee, Woong Choi, Jae Hyung Kim, Sohyeon Park, Yun Jeong Hwang, Jonggeol Na
Summary: This study evaluates the economic and environmental potential of direct electrochemical conversion of captured CO2 technology through techno-economic analysis and life cycle assessment. The results indicate that the technology has good economic potential if developed to the same level as the conventional CO2 reduction reaction process. Moreover, the environmental impact of the technology is positive, especially when using renewable electricity.
Article
Chemistry, Multidisciplinary
Jae Hyung Kim, Hyunsung Jang, Gwangsu Bak, Woong Choi, Hyewon Yun, Eunchong Lee, Dongjin Kim, Jiwon Kim, Si Young Lee, Yun Jeong Hwang
Summary: This research discovered a cation-insensitive single atom nickel catalyst that exhibits high CO selectivity and activity in different capturing solutions, providing new insights into selective catalyst design for the electroconversion of captured CO2 in universal media.
ENERGY & ENVIRONMENTAL SCIENCE
(2022)
Article
Chemistry, Physical
Woong Choi, Yongjun Choi, Eunsuh Choi, Hyewon Yun, Wonsang Jung, Woong Hee Lee, Hyung-Suk Oh, Da Hye Won, Jonggeol Na, Yun Jeong Hwang
Summary: In this study, a zero-gap membrane-electrode assembly (MEA) electrolyzer was designed to investigate the factors that determine the electrochemical CO2 reduction reactions (eCO(2)RRs) activity and multi-carbon production. The researchers discovered that under alkaline conditions, a simple synchronous activation step can create jagged CuO nanoparticles, which facilitate the production of C2+ chemicals in the zero-gap MEA electrolyzer. Furthermore, computational fluid dynamics analysis revealed that the mass transfer limitation of water and cathode kinetic overpotential play critical roles in determining the production of C2+ chemicals.
JOURNAL OF MATERIALS CHEMISTRY A
(2022)