Article
Chemistry, Multidisciplinary
Liping Peng, Yulin Xie, Changquan Yang
Summary: This study investigated the photoelectric properties of different metal atoms adsorbed on a 2D perovskite surface, finding that Bi atom adsorption results in the most stable structure, improves charge carrier transfer, and enhances the photoelectric properties significantly compared to Ag and Au adsorption. Additionally, the impact of Bi atom adsorption on 2D perovskite is stronger than that of Ag or Au, as confirmed by light absorption spectrum analysis.
Article
Chemistry, Multidisciplinary
Junsang Cho, Preethi S. Mathew, Jeffrey T. DuBose, Prashant Kamat
Summary: 2D lead halide perovskites with tunable bandgap and enhanced chemical stability are useful for designing optoelectronic devices. Reducing dimensionality can increase resistance to light-induced ion migration, but also decreases the efficiency of halide ion segregation and segregation rate constant, leading to a decrease in charge-carrier lifetime.
ADVANCED MATERIALS
(2021)
Article
Chemistry, Physical
Rachel Elizabeth Brophy, Movaffaq Kateb, Kristinn Torfason, George Alexandru Nemnes, Halldor Gudfinnur Svavarsson, Ioana Pintilie, Andrei Manolescu
Summary: This study reveals that the diffusion of iodide defects is the most important degradation mechanism in methylammonium lead iodide (MAPI) solar cells, and highlights the influence of internal pressure on the dynamics of these defects. Results show that the diffusion coefficient of an iodide vacancy is one order of magnitude higher than that of interstitial iodide, and this difference increases with increased tensile strain. The diffusion coefficients tend to zero under compressive strain, suggesting that compression of MAPI can effectively reduce its degradation rate. Furthermore, the statistical aspect of deriving the diffusion coefficient using mean squared displacement (MSD) is discussed in terms of initial conditions and simulation time.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Chemistry, Multidisciplinary
Jie Chen, Yiwen Zeng, Ruifen Sun, Weiwei Zhang, Yun Huang, Jingcheng Zheng, Yuwu Chi
Summary: This study finds that humidity can modulate the emission properties of mixed-halide perovskite, providing a new option to reversibly control fluorescence emission. The different solubilities, structural transformation, and glass matrix confinement are demonstrated to play key roles in this reversible transformation. Furthermore, the application of reversible emission transformation in advanced anti-counterfeiting can greatly improve information security.
Article
Chemistry, Multidisciplinary
Yongtao Liu, Anton V. Ievlev, Nikolay Borodinov, Matthias Lorenz, Kai Xiao, Mahshid Ahmadi, Bin Hu, Sergei V. Kalinin, Olga S. Ovchinnikova
Summary: The study directly observes photoinduced ion migration in HOIPs, demonstrating that light illumination induces significant CH3NH3+ migration but not I-/Br- migration. Light effects on the migration of organic cation and halides in HOIPs are revealed to be distinct, offering insights for improving the performance and stability of HOIPs optoelectronics.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Hualin Wu, Chenzhe Xu, Zihan Zhang, Zhaozhao Xiong, Mingyue Shi, Shuangfei Ma, Wenqiang Fan, Zheng Zhang, Qingliang Liao, Zhuo Kang, Yue Zhang
Summary: A fundamental understanding of ion migration inside perovskites is crucial for advancements in commercial photovoltaics. In this study, the impact of external ions on ion migration behavior in co-incorporated mixed halide perovskites was investigated. The results demonstrate that passivated ion migration improves the phase stability of perovskites.
Article
Chemistry, Physical
Mrinmoy Roy, Vikram, Bhawna, Urvi Dedhia, Aftab Alam, M. Aslam
Summary: A simple synthesis process for compound-phase perovskite nanoparticles was introduced, which involves mixing two pure-phase perovskites using ultrasonic vibration. The method eliminates the need for designing a reaction or selecting specific precursors, providing better stability and synthesis efficiency.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2021)
Article
Materials Science, Multidisciplinary
Pengpeng Teng, Sebastian Reichert, Weidong Xu, Shih-Chi Yang, Fan Fu, Yatao Zou, Chunyang Yin, Chunxiong Bao, Max Karlsson, Xianjie Liu, Jiajun Qin, Tao Yu, Wolfgang Tress, Ying Yang, Baoquan Sun, Carsten Deibel, Feng Gao
Summary: One of the critical challenges in perovskite light-emitting diodes (PeLEDs) is poor operational stability, but a unique self-repairing behavior has been discovered where the electroluminescence of moderately degraded PeLEDs can almost completely restore after resting. By understanding the back diffusion of accumulated halides, which repair vacancies in the perovskite layer, the operational stability of PeLEDs can be significantly improved by passivating the key interface.
Article
Chemistry, Physical
Lucie McGovern, Gianluca Grimaldi, Moritz H. Futscher, Eline M. Hutter, Loreta A. Muscarella, Moritz C. Schmidt, Bruno Ehrler
Summary: The study investigates the ion migration process in methylammonium-based mixed-halide perovskites with varying ratios of bromide to iodide, revealing lower activation energies and higher density of mobile ions compared to pure-halide perovskites. Under illumination, the concentration of mobile halide ions further increases and a migration process involving methylammonium cations emerges, providing insights for designing bandgap-tunable perovskite solar cells with long-term stability.
ACS APPLIED ENERGY MATERIALS
(2021)
Review
Chemistry, Multidisciplinary
Yongtao Liu, Dohyung Kim, Anton V. Ievlev, Sergei V. Kalinin, Mahshid Ahmadi, Olga S. Ovchinnikova
Summary: Metal halide perovskites (MHPs) have received tremendous attention in optoelectronics due to their outstanding performance, but it remains uncertain whether they possess ferroelectricity. Discussion about ferroelasticity in MHPs has recently emerged. Understanding the interplay of phenomena such as electric polarization, strain, ionic motion, and structural dynamics is crucial for addressing the controversy about MHPs' ferroicity and developing functional devices.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Article
Chemistry, Physical
Pranjul Bhatt, Amit Kumar, Neha Singh, Ashish Garg, Kanwar Singh Nalwa, Abhishek Tewari
Summary: Partial substitution of CH3NH3 (+) with Cs+ ions has been investigated to suppress iodide vacancy diffusion in MAPI and enhance structural stability. Atomistic simulations and experimental characterization were performed to study the defect chemistry and halide ion mobility in Cs-doped MAPI. The results showed weak dependence of defect clustering and diffusion activation energy on stoichiometry, and confirmed the reduced hysteresis and higher activation energy of halide migration in Cs-doped MAPI.
ACS APPLIED ENERGY MATERIALS
(2023)
Article
Chemistry, Physical
Shuang-Qiao Sun, Cheng Liu, Min Zhu, Yan-Lin Xu, Wei He, Dan-Dan Feng, Chen-Chao Huang, Qi Sun, Yue-Min Xie, You-Yong Li, Man-Keung Fung
Summary: This study reveals the influence of electrical bias on the spectral stability and efficiency roll-off of mixed-halide PeLEDs and identifies several key factors, including electric-field induced Joule heating, pinhole formation under electrical bias, and halogen ion migration. Furthermore, the study substantiates that chloride ion migration plays a more dominant role in device degradation.
MATERIALS TODAY ENERGY
(2022)
Article
Chemistry, Multidisciplinary
Yoonseo Nah, Omar Allam, Han Seul Kim, Ji Il Choi, In Soo Kim, Jinwoo Byun, Sang Ouk Kim, Seung Soon Jang, Dong Ha Kim
Summary: This study investigates the origin of electroluminescence peak shifts in mixed halide perovskites, finding that the applied electric field drives systematic halide migration, leading to the redistribution of anions due to different activation energies required for directional ion hopping. The spectral shifting rate of electroluminescence is dependent on the drift velocity of halides, and red emission is suggested to be attributed to thermodynamically favorable selective hole injection. Insights from this mechanistic study provide understanding of the fundamental reason for the spectral instability in devices based on mixed halide perovskites.
Article
Chemistry, Multidisciplinary
Xinliang Fu, Mei Wang, Yuanzhi Jiang, Xiangyu Guo, Xin Zhao, Changjiu Sun, Li Zhang, Keyu Wei, Hsien-Yi Hsu, Mingjian Yuan
Summary: Mixed-halide perovskites can be precisely tuned across the entire spectral range using composition engineering. However, ion migration in mixed halide perovskites under continuous illumination or electric field hinders the application of perovskite light-emitting diodes (PeLEDs). A novel approach that introduces strong and homogeneous halogen bonds within the quasi-two-dimensional perovskite lattices effectively suppresses ion migration, enhancing the stability of quasi-2D mixed-halide perovskite films. These PeLEDs exhibit an impressive 18.3% EQE with pure red emission and demonstrate a long operational half-life of approximately 540 minutes, making them one of the most stable mixed-halide pure red PeLEDs reported to date.
Article
Materials Science, Multidisciplinary
Chinnadurai Muthu, Johnpaul K. Pious, Tino Thankachan, Nayana Krishna, Chakkooth Vijayakumar
Summary: This study reports a method of using PF gel to modify the surface of CsPbBr1.5I1.5 based mixed halide PNCs, which can effectively suppress halide ion migration and achieve stable and efficient white light emission.
ADVANCED OPTICAL MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Xin Zhao, Xiangtong Meng, Hongqi Zou, Zhenhao Wang, Yadong Du, Yuan Shao, Jun Qi, Jieshan Qiu
Summary: A novel strategy to manipulate the surface topography of graphene oxide (GO) via electrostatic assembly coupled with in situ polymerizations of aniline is reported. The resulting composite material exhibits improved evaporation performance and efficiency, making it suitable for practical freshwater production.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Review
Chemistry, Multidisciplinary
Yuanyang Xie, Chang Yu, Lin Ni, Jinhe Yu, Yafang Zhang, Jieshan Qiu
Summary: This review focuses on the intrinsic role of carbon materials in carbon-hybridized hydroxides (CHHs), particularly regarding the interface chemistry and engineering strategy between the two components. The fundamental effects of carbon materials in enhancing charge/mass transfer kinetics are analyzed, along with the surface-guided/confined effects in modifying morphology and tailoring hydroxides. Methods for constructing stable and robust solid-solid heterointerfaces are summarized, and the application of CHHs in energy conversion/storage is demonstrated. Additionally, methodologies for investigating the hybridization electron configuration between two components are identified. The perspective and challenges of using CHHs in energy-related applications are outlined.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Hongling Huang, Xuedan Song, Chang Yu, Qianbing Wei, Lin Ni, Xiaotong Han, Huawei Huang, Yingnan Han, Jieshan Qiu
Summary: In this study, a novel liquid-liquid-solid system is reported to regulate the selectivity of benzyl alcohol electrooxidation. The selectivity of benzaldehyde increases 200-fold from 0.4% to 80.4% compared with the liquid-solid system at a high current density of 136 mA cm(-2), which is the highest one up to date. In the tri-phase system, the benzaldehyde peroxidation is efficiently suppressed, with the conversion of benzaldehyde being decreased from 87.6% to 3.8%. The as-produced benzaldehyde can be in situ extracted to toluene phase and separated from the electrolyte to get purified benzaldehyde. This strategy provides an efficient way to enhance the selectivity of electrocatalytic cascade reactions.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Multidisciplinary
Ren Zou, Weijin Zhang, Min Dai, Gangtie Lei, Qike Jiang, Hujun Cao, Ping Chen
Summary: A simple and efficient organic solvent-assisted ball-milling process was developed to synthesize magnesium and lithium nanoparticles. Acetone was found to react with magnesium, forming metastable magnesium complexes that significantly altered the properties of the nanoparticles. This method provides a new strategy for synthesizing light metal nanoparticles.
Article
Chemistry, Physical
Yangjun Ma, Xiangtong Meng, Kai Li, Lipeng Zhang, Yadong Du, Xiang Cai, Jieshan Qiu
Summary: Active-site enriched N,Se-co-doped porous carbon (NSeC) is prepared and shows high electrocatalytic activity and durability towards triiodide reduction. The synergy between N and Se species and the active sites formed by carbon atoms adjacent to quaternary N and Se atoms contribute to the high catalytic activity.
Article
Chemistry, Multidisciplinary
Siyi Hou, Chang Yu, Xuedan Song, Yiwang Ding, Jiangwei Chang, Yingbin Liu, Lin Chen, Qianbing Wei, Xiubo Zhang, Jieshan Qiu
Summary: An effective strategy is developed to modulate the in-plane defective density and electronic structure of multi-walled carbon nanotubes by ultra-small-sized g-C3N4 quantum dots via p-p stacking. The optimized heterogeneous catalyst exhibits an optimal photoelectric conversion efficiency of up to 8.30% in the triiodide reduction reaction, outperforming the Pt reference.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Jinhe Yu, Chang Yu, Xuedan Song, Qing Zhang, Zhao Wang, Yuanyang Xie, Yingbin Liu, Wenbin Li, Yiwang Ding, Jieshan Qiu
Summary: Localized water-in-salt (LWIS) electrolytes are a promising candidate for high-voltage aqueous electrolytes with low viscosity and low salt content. The choice of an effective diluent is crucial for the properties of LWIS electrolytes. By identifying the donor number of solvents as a descriptor of solvent-salt interaction intensity, organic diluents that have minimal impact on the solvation microenvironment and intrinsic properties of the original high-salt electrolyte can be screened. This allows for the construction of a novel low-viscosity electrolyte with a low dosage of LiNO3 salt and well-preserved intrinsic Li+-NO3 (-)-H2O clusters, leading to improved performance in aqueous supercapacitors.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Chemistry, Physical
Sheng Feng, Wenbo Gao, Jianping Guo, Hujun Cao, Ping Chen
Summary: The chemical looping process for ammonia synthesis (CLAS) has advantages in optimizing the thermodynamics and kinetics of a reaction step by step. Recent studies have shown that alkali- and alkaline earth-metal imides are attractive nitrogen carriers, but their conversion to ammonia and hydrides has low equilibrium concentration and slow reaction rate. This study demonstrates that an electrodriven CLAS (ECLAS) mediated by a lithium imide is feasible and significantly improves ammonia production rate compared to a thermal-driven CLAS.
ACS ENERGY LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Yuanyang Xie, Chang Yu, Xiubo Zhang, Guibin Gu, Jinhe Yu, Yi Yang, Jieshan Qiu
Summary: The poor processability of hydroxide has hindered its practical applications. This study reports a processable highly concentrated double hydroxide ink that can be processed into various forms due to its interior-ordered structure, and it shows good performance in zinc ion batteries.
ADVANCED MATERIALS
(2023)
Article
Engineering, Environmental
Jialing Li, Ren Zou, Yajun Cui, Gangtie Lei, Zhi Li, Hujun Cao
Summary: Researchers synthesized an N ion-doped Na2TiO3 catalyst to improve the dehydrogenation properties of MgH2, resulting in lower peak temperature and increased hydrogen release. The modified MgH2 also showed improved cycle stability and high reversible hydrogen capacity.
CHEMICAL ENGINEERING JOURNAL
(2023)
Review
Materials Science, Multidisciplinary
Xiaomin Yang, Huihui He, Ting Lv, Jieshan Qiu
Summary: With the growing concern for energy and environmental issues, the efficient utilization of biomass has become a promising field in science and technology. Biomass-based functional carbon materials (BFCs), characterized by renewability, flexible structural tunability, and diverse physicochemical properties, have shown great potential in energy conversion and storage. This review provides a comprehensive summary of the recent advances in BFCs, including synthesis methods, structures and properties, as well as emerging applications in various energy-oriented fields.
MATERIALS SCIENCE & ENGINEERING R-REPORTS
(2023)
Article
Chemistry, Physical
Ren Zou, Jialing Li, Weijin Zhang, Gangtie Lei, Zhi Li, Hujun Cao
Summary: By introducing nitrogen anions, a N-doped K2Ti6O13 (N-KTiO) catalyst with reduced band gap was obtained, which improved the kinetics and cycling stability of the Mg/MgH2 system. The peak temperature of MgH2 with 5 wt% N-KTiO was significantly lower than those of TiO2 catalysed and pure ones, and it absorbed 4.6 wt% H2 in 1 hour even at room temperature. After cycling for 200 times at 300 degrees C, the H2 capacity remained at 6.8 wt% with a retention as high as 94.4%. The research provides insights for developing effective catalysts for light metal hydrogen storage materials.
JOURNAL OF MATERIALS CHEMISTRY A
(2023)
Article
Chemistry, Multidisciplinary
Xingyu Wang, Yu Shi, Jieshan Qiu, Zhiyu Wang
Summary: This study proposes a LiF-involved molten-salt etching method for producing delaminatable MXenes with comparable quality and supercapacitive performance to those made by solution etching. This approach combines the benefits of molten-salt etching in processability with the high exfoliation efficiency of the solution-based etching method.
CHEMICAL COMMUNICATIONS
(2023)
Article
Chemistry, Multidisciplinary
Ren Zou, Jialing Li, Jirong Cui, Weijin Zhang, Gangtie Lei, Hujun Cao, Ping Chen
Summary: An organic solvent-assisted catalyst-free mechanochemical reaction is developed for synthesizing lithium hydride under mild gas pressures and room temperature. The formation of intermediates on the surface of bulk lithium metal is found crucial for achieving high purity (>98%) LiH synthesis. This provides a new strategy for large-scale production of lithium-based hydrogen storage materials.
CHEMICAL COMMUNICATIONS
(2023)
Article
Chemistry, Physical
Yangjun Ma, Xiangtong Meng, Kai Li, Lipeng Zhang, Yadong Du, Xiang Cai, Jieshan Qiu
Summary: Electrocatalytic interconversion of iodide/triiodide is crucial for iodine-involved energy technologies. In this study, N,Se-co-doped porous carbon with enriched active sites (named NSeC) was fabricated through a two-step approach. Spectroscopy measurements confirmed the incorporation of extrinsic N and Se species into the carbon matrix. The NSeC sample synthesized at 900 degrees C exhibited excellent durability and high electrocatalytic activity towards triiodide reduction.
