Article
Chemistry, Physical
Pengchao Si, Mengqi Li, Xiang Wang, Feifei Sun, Jingjing Liu, Qinhuan Wang, Fuqiang Ren, Haoran Kong, Yu Wang
Summary: By annealing TiO2 in a H-2 atmosphere at different temperatures, Magneli phase titanium suboxide with a lot of oxygen vacancies can be prepared, leading to significant improvements in the performance of energy conversion units.
ACS APPLIED ENERGY MATERIALS
(2021)
Article
Energy & Fuels
Huiyong Niu, Yanxiao Yang, Shuopeng Li
Summary: This paper investigates the influence of pre-oxidization temperature and pre-oxidization oxygen concentration on the secondary oxidation of coal. The results suggest that both temperature and oxygen concentration have effects on the burning process of oxidized coal, particularly in the first three stages. Importantly, different pre-oxidized coals have different risks in different stages of the secondary oxidation process.
Article
Health Care Sciences & Services
Tin-Chih Toly Chen, Teng Chieh Chang, Yu-Cheng Wang
Summary: Reducing NOx emissions after coal combustion is crucial for thermal power plants to minimize health risks. This study proposes a fuzzy big data analytics approach to predict post-combustion NOx emissions based on coal composition, which can be used to optimize boiler configuration and combustion conditions. Experimental results demonstrate that the proposed methodology outperforms existing methods in terms of prediction accuracy.
Article
Chemistry, Physical
Dennis P. P. Trujillo, Ashok Gurung, Jiacheng Yu, Sanjeev K. K. Nayak, S. Pamir Alpay, Pierre-Eymeric Janolin
Summary: A study combining data mining and first-principles computations has discovered a group of iodides, bromides, and chlorides with high electrostrictive coefficients and effective piezoelectric voltage coefficients.
NPJ COMPUTATIONAL MATERIALS
(2022)
Article
Thermodynamics
Chun Lou, Yang Pu, Yonggang Zhao, Yang Bai, Bin Yao, Dunxi Yu
Summary: Measurement of time-resolved alkali metals release is crucial to mitigate the problems caused by alkali metals during coal combustion. The Flame Emission Spectroscopy (FES) method proposed in this paper can accurately measure the release of sodium (Na) and distinguish different stages of release.
PROCEEDINGS OF THE COMBUSTION INSTITUTE
(2021)
Article
Green & Sustainable Science & Technology
Hui Yue, Ernst Worrell, Wina Crijns-Graus, Shaohui Zhang
Summary: Efficiency improvements in the industrial sector can reduce reliance on coal-fired power generation and lead to the phased-out of high-polluting power units in China. By promoting efficient electricity usage in industry, less efficient coal-fired plants can be curbed from coming online, leading to significant reduction in air pollutant emissions due to the closure of coal-fired power units. Improved industrial energy efficiency is shown to be more cost-effective than installing flue gas controls in coal-fired plants, and can also contribute to climate change mitigation and enable the expansion of renewable power supply.
JOURNAL OF CLEANER PRODUCTION
(2021)
Article
Energy & Fuels
Wen-gang Huang, Zuo-tang Wang, Tian-hong Duan, Lin Xin
Summary: The pilot project integrating UCG with power generation in the abandoned mine Ankou aimed to optimize the gasification process, with industrial tests revealing that changes in oxygen concentration significantly affected syngas production. Increasing oxygen concentration led to higher H-2 content, combustible components, calorific value of syngas, and gasification efficiency after an initial drop. Additionally, oxygen-enriched gasification trials showed advantages in air consumption, coal consumption, and calorific value compared to oxygen-enriched steam gasification tests.
Article
Economics
Smaranda Sgarciu, Daniel Scholz, Felix Muesgens
Summary: This paper analyzes the potential impact of two main coal phase-out instruments: direct regulatory intervention and market-based CO2-pricing instruments. The study focuses on Germany but the methodology can be applied worldwide. The results show that both instruments can reduce coal-fired generation and need to be considered in planning for structural change.
Article
Engineering, Environmental
Mohammad Balapour, Thiha Thway, Rathin Rao, Newell Moser, Edward J. Garboczi, Y. Grace Hsuan, Yaghoob Farnam
Summary: A systematic thermodynamics-based framework was used to recycle waste coal combustion fly ash into synthetic lightweight aggregates through sintering. The process requires a delicate balance among liquid phase formation, viscosity, and gas emission. Thermodynamics modeling and analysis techniques such as thermogravimetric analysis and X-ray computed tomography were used to quantify and observe different aspects of the process.
RESOURCES CONSERVATION AND RECYCLING
(2022)
Article
Environmental Sciences
Aniruddh Mohan, Shayak Sengupta, Parth Vaishnav, Rahul Tongia, Asim Ahmed, Ines L. Azevedo
Summary: This article discusses the costs of hybrid power plants replacing coal generation in India and highlights the need for low-cost capital, affordable solar PV, and battery storage to achieve the phaseout of coal power. It emphasizes the challenging technological advancements and policy changes required to meet the temperature goals of the Paris Agreement.
ENVIRONMENTAL RESEARCH LETTERS
(2022)
Article
Optics
Hakduck Kim, Jeongmin Choi, Heechang Lim, Juhun Song
Summary: A numerical analysis was conducted to predict the radiation characteristics of burning coal layers in an enclosed chamber. The study solved the one-dimensional energy balance equation and radiative transfer equation using the semi-implicit Runge-Kutta method and discrete ordinate method. Additionally, a commercial software was used to analyze the two-dimensional radiation behavior. The results showed the significance of moisture condensation on the reduced heat flux in high moisture coal burning.
JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER
(2023)
Review
Chemistry, Multidisciplinary
Shadpour Mallakpour, Elham Azadi, Chaudhery Mustansar Hussain
Summary: Covalent organic frameworks (COFs) are innovative crystalline/porous macrocyclic materials composed of purely organic building blocks with strong covalent linkages. They have low density, promising stabilities, great surface area, ordered porous networks, and unique functionalities, making them suitable for designing novel systems in combination with other materials.
NEW JOURNAL OF CHEMISTRY
(2021)
Article
Energy & Fuels
Dan Gall, Thomas Allguren, Jakob Johansson, Fredrik Normann, Anette Heijnesson Hulten, Adrian Gunnarsson, Klas Andersson
Summary: Research has shown that recirculation of scrubber effluent can effectively reduce nitrogen-containing compounds, decrease ammonia demand, increase deposition growth rate, and alter chemical composition of deposits.
Article
Chemistry, Physical
Michael R. Zachariah, Prithwish Biswas, Yujie Wang, Steven Herrera, Pankaj Ghildiyal
Summary: Incorporating ammonia borane (NH3BH3/AB) into polymer matrices with carbonyl functional groups can facilitate its decomposition into ammonia and borane gases, preventing its thermochemical oligomerization. This chemical pathway allows for the controlled release of reactive fuels for high-energy applications.
CHEMISTRY OF MATERIALS
(2023)
Article
Engineering, Electrical & Electronic
Mohammad-Amin Pourmoosavi, Turaj Amraee
Summary: This paper proposes a multi-period low carbon Generation Expansion Planning (LC-GEP) model to optimize the type, capacity, and installation time of conventional and renewable generation technologies under low carbon policy. Carbon reduction technologies, such as CCUS and coal phase-out, are considered, along with efficiency improvement tools like the conversion of NGOC units to NGCC units. The efficacy of the model is investigated under Carbon Cap and Tax policy, with technical constraints and a new test system developed for verification.
INTERNATIONAL JOURNAL OF ELECTRICAL POWER & ENERGY SYSTEMS
(2021)
Article
Chemistry, Physical
Heyong Wang, Zhan Chen, Fuyu Tian, Guanhaojie Zheng, Hongguang Wang, Tiankai Zhang, Jiajun Qin, Xingyu Gao, Peter A. van Aken, Lijun Zhang, Xiao-Ke Liu, Feng Gao
Summary: A strong correlation between lattice strain in perovskite films and the stability of PeLEDs is revealed in this study. The lifetime of high-efficiency PeLEDs is optimized by tailoring the lattice strain. The study also indicates that the degradation of the local perovskite lattice structure could be a degradation mechanism for long-term stable PeLEDs.
ADVANCED ENERGY MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Jieqiu Wang, Fei Pang, Qianqian Fu, Jianping Ge
Summary: Photonic crystal patterns with angle-dependent colors are a promising anti-counterfeiting material. Delicate PC patterns can be fabricated by silkscreen printing of photo-curable SiO2/monomer PC inks on the substrate, followed by UV irradiation to fix the PC structures. The resulting PC marks show noticeable angle effects, uniform color distribution, and good mechanical and chemical stabilities. Different silk screen stencils are investigated to achieve the best color intensity and printing resolution. As a demonstration of their anti-counterfeiting functions, the PC patterns exhibit color changes and reversible switches under different angles.
SCIENCE CHINA-MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
Xiaodong Lu, Xiaohui Wang, Xinyang Li, Liqin Chai, Guojin Liu, Jianping Ge, Jianzhong Shao
Summary: A novel approach to constructing patterned photonic crystals via screen printing was designed and achieved. Patterned PCs with high-saturation iridescent effect were prepared by printing a hydrophilic polymer paste on a hydrophobic fabric and scraping liquid photonic crystals on the fabric. Complex multistructural color patterns were achieved by adjusting the nanosphere size and using multistep printing and scraping.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Multidisciplinary
Huanxin Guo, Xiaoyu Wang, Chengjie Li, Honglong Hu, Huidong Zhang, Lijun Zhang, Wei-Hong Zhu, Yongzhen Wu
Summary: A supramolecular strategy involving surface anion complexation with Calix[4]pyrrole (C[4]P) is reported for enhancing the stability of perovskite solar cells. The C[4]P-stabilized perovskite films demonstrated increased light and thermal stability, and showed preservation of their morphology even after ageing at high temperatures and under humid conditions. The use of C[4]P resulted in significant improvement in the lifespan and efficiency of the perovskite solar cells.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Wenjin Yu, Mingyang Wei, Zhenyu Tang, Hongshuai Zou, Liang Li, Yu Zou, Shuang Yang, Yunkun Wang, Yuqing Zhang, Xiangdong Li, Haoqing Guo, Cuncun Wu, Bo Qu, Yunan Gao, Guowei Lu, Shufeng Wang, Zhijian Chen, Zhiwei Liu, Huanping Zhou, Bin Wei, Yingjie Liao, Lijun Zhang, Yan Li, Qihuang Gong, Edward H. H. Sargent, Lixin Xiao
Summary: A new synthetic approach is developed to improve the LED performance of perovskite nanocrystals. By introducing a bifunctional carboxylic-acid-containing ammonium hydrobromide ligand, the crystallization process of perovskite nanocrystals can be controlled, leading to improved photoluminescence quantum yield. Green LEDs fabricated using this method even outperform traditional perovskite nanocrystal-based LED devices.
ADVANCED MATERIALS
(2023)
Article
Physics, Multidisciplinary
Yilin Zhang, Huimin Mu, Yuxin Cai, Xiaoyu Wang, Kun Zhou, Fuyu Tian, Yuhao Fu, Lijun Zhang
Summary: We developed an algorithm for identifying and characterizing the connection patterns of structural units in open-framework structures and constructed a descriptor set for the thermal expansion properties of this system, which is composed of connectivity and elemental information. Our developed descriptor, aided by machine learning (ML) algorithms, can effectively learn the thermal expansion behavior in small sample datasets collected from literature-reported experimental data (246 samples). Our results demonstrate that developing effective descriptors closely related to thermal expansion properties enables ML models to make accurate predictions even on small sample datasets, providing a new perspective for understanding the relationship between connectivity and thermal expansion properties in the open framework structure.
Article
Chemistry, Physical
Yilin Zhang, Yuanhui Sun, Huimin Mu, Hongshuai Zou, Fuyu Tian, Yuhao Fu, Lijun Zhang
Summary: Two-dimensional layered materials have potential applications in miniaturized devices, but thermal management issues, such as thermal mismatch and thermal stress, can degrade device performance. In this study, we propose two new descriptors, the axial elastic deviation factor sigma i and the axial net thermal stress fi, to evaluate the thermal expansion behavior of layered materials. Based on the analysis of these descriptors, we found in-plane negative thermal expansion in PtS2 (-1.2 ppm/K) and PtSe2 (-0.8 ppm/K), considering their elastic property. Our work provides a unified understanding of the thermal expansion causes in layered materials and can guide the screening of thermal expansion materials and subsequent device design.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Chemistry, Physical
Dengpeng Lan, Wenting Sheng, Qianqian Fu, Jianping Ge
Summary: A photonic crystal supported blue TiO2 photocatalyst (BTPC) was prepared, showing 5-6 times higher activity and improved CH4 selectivity compared to BT catalysts on quartz plate. The enhanced light absorption and increased surface electron density contributed to the superior catalytic performance, which were influenced by the reflection intensity and wavelength of PC support.
Article
Nanoscience & Nanotechnology
Bangyu Xing, Dandan Sang, Xueting Wang, Hongdong Li, Lijun Zhang
Summary: Surface charge transfer doping (SCTD) is an alternative approach to achieve n-type doped diamonds. However, efficient diamond n-type SCTD has not been achieved so far. In this study, first-principles calculations were used to comprehensively investigate the n-type SCTD of diamond. Methyl viologen and benzyl viologen were found to provide the largest amount of transferred electrons among common n-type SCTD dopants for the oxygen and fluorine terminated (100) surface diamond.
Article
Multidisciplinary Sciences
Shuo Zhang, Fangyuan Ye, Xiaoyu Wang, Rui Chen, Huidong Zhang, Liqing Zhan, Xianyuan Jiang, Yawen Li, Xiaoyu Ji, Shuaijun Liu, Miaojie Yu, Furong Yu, Yilin Zhang, Ruihan Wu, Zonghao Liu, Zhijun Ning, Dieter Neher, Liyuan Han, Yuze Lin, He Tian, Wei Chen, Martin Stolterfoht, Lijun Zhang, Wei-Hong Zhu, Yongzhen Wu
Summary: In this study, an amphiphilic molecular hole transporter with a multifunctional cyanovinyl phosphonic acid group was used to deposit a superwetting underlayer for perovskite deposition. This enabled the formation of high-quality perovskite films with minimized defects at the buried interface. The resulting perovskite film showed excellent photoluminescence properties and achieved a certified PCE of 25.4%, demonstrating its potential for application in solar cells.
Article
Multidisciplinary Sciences
Yurui Wang, Renxing Lin, Xiaoyu Wang, Chenshuaiyu Liu, Yameen Ahmed, Zilong Huang, Zhibin Zhang, Hongjiang Li, Mei Zhang, Yuan Gao, Haowen Luo, Pu Wu, Han Gao, Xuntian Zheng, Manya Li, Zhou Liu, Wenchi Kong, Ludong Li, Kaihui Liu, Makhsud I. Saidaminov, Lijun Zhang, Hairen Tan
Summary: By reversing the processing order and using a substrate configuration, the authors bury the oxidizable narrow-bandgap perovskites in all-perovskite tandem solar cells, resulting in an efficient and stable device with an efficiency of 25.3%.
NATURE COMMUNICATIONS
(2023)
Article
Chemistry, Multidisciplinary
Wenyuan Yu, Yanxuan Zhao, Wenting Sheng, Jianping Ge
Summary: Electrically responsive photonic crystals (ERPC) are promising materials for various applications, but high working voltage limits their use due to poor performance. A method utilizing nanoparticle modification of electrodes is proposed to enhance ERPC performance, lowering working voltage and improving color saturation, stability, and reversibility. Additionally, this method allows for the fabrication of electrically triggered tags with a pattern showing/hiding effect for anti-counterfeiting purposes.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Xin Zhang, Tian Yin, Jianping Ge
Summary: In this study, a multilayer thermochromic film was developed for thermal printing, which exhibited fast thermal response and stable performance. It enabled high-resolution and grayscale printing, and improved the user experience.
ADVANCED MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Guangyang Bao, Wenyuan Yu, Qianqian Fu, Jianping Ge
Summary: This study reports a method of fabricating an electrically responsive photonic crystal (ERPC) in weak polar media. The ERPC shows good performance due to less screening of Coulombic interaction. By using aniline as a weak polar solvent, the ERPC is fabricated without any charge-controlling agent. The resulting SiO2/ANI ERPC exhibits a broad reflection wavelength tuning range (230 nm) and a low working potential (1.4 V), leading to improved stability and reversibility of the electrical tuning.
JOURNAL OF MATERIALS CHEMISTRY C
(2023)
Article
Nanoscience & Nanotechnology
Zonghui Duan, Guangren Na, Shixun Wang, Jiajia Ning, Bangyu Xing, Fei Huang, Arsenii S. Portniagin, Stephen Kershaw, Lijun Zhang, Andrey L. Rogach
Summary: This study demonstrates a proton transfer process between the organic moiety and the introduced aliphatic alkylamines in 3D methylammonium lead halide perovskite, providing a foundation for fabricating hybrid 3D/2D perovskites and purely 2D Ruddlesden-Popper (RP) perovskite phases. By adjusting the concentration of alkylamine-containing antisolvents, the ratio between the 3D and 2D phases can be controlled. Longer-chain aliphatic alkylamines have the ability to slice 3D perovskite into layered perovskites with efficient green emission. Above a certain concentration threshold, the 3D perovskite can be completely transformed into 2D RP perovskite phases with a specific crystalline orientation.