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Insights into lithium adsorption by coal-bearing strata kaolinite

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Frontiers of Earth Science 2023年第1期17卷 251-261页

作者： Yu CHEN Hao ZHAO Mingzhe XIA hongfei cheng School of Earth Science and Resources Chang’an UniversityXi’an 710054China

The sharp increase in the demand for lithium(Li)for high-energy-storage battery materials due to its high specific energy and low negative chemical potential render Li a geopolitically significant *** is urgent to develop a low-cost,efficient method to improve lithium ***,Li ion(Li+)adsorption in coal-bearing strata kaolinite(CSK)was *** effects of pre-activation acid leaching(meta-kaolinite/H2SO4,MK-HS)and dimethyl sulfoxide intercalation(coal-bearing strata kaolinite/dimethyl sulfoxide,CSK-DMSO)on the Li+adsorption capacity were studied under the same adsorption *** results indicated that the adsorption was completed in 60 min under alkaline conditions(pH=8.5),a high solution concentration(400 mg/L),and a low dosage(1 g/100 mL);and the comprehensive adsorption capacity is MK-HS>CSK-DMSO>***,the DMSO intercalation caused the interlayer spacing of the CSK to increase,which provided more space for Li+to enter and increase the adsorption *** thermal pre-activation and acid leaching,structural failure and lattice collapse resulted in the presence of more micropores in the MK-HS,which resulted in a 10-fold increase in its specific surface area and caused coordination bond changes(Al(VI)to Al(IV))and leaching of aluminum(Al)from the *** is proposed that these structural changes greatly improve the activity of CSK so that Li+cannot only adsorb onto the surface and between the layers but can also enter the lattice defects,which results in the MK-HS having the best adsorption *** with the adsorption kinetics analysis,the adsorption methods of CSK and two modified materials include physical adsorption and chemical *** this study,the adsorption capacity of CSK and its modified products to Li were explored,providing a new option for the reuse of CSK and the extraction of Li.

关键词： coal-bearing strata kaolinite lithium adsorption modification

Electrocatalysts for Formic Acid-Powered PEM Fuel Cells:Challenges and Prospects

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Energy Material Advances 2023年第1期4卷 522-546页

作者： hongfei cheng John Wang Chuan Wu Zhaolin Liu College of Materials Science and Engineering Tongji UniversityShanghai 201804People’s Republic of China Institute of Materials Research and Engineering(IMRE) Agency for ScienceTechnology and Research(A*STAR)2 Fusionopolis WayInnovis#08-03Singapore 138634Republic of Singapore Department of Materials Science and Engineering National University of SingaporeSingapore 117574Republic of Singapore School of Materials Science and Engineering Beijing Institute of TechnologyBeijing 100081People’s Republic of China

In view of the drawbacks of rechargeable batteries,such as low mass and volumetric energy densities,as well as slow charging rate,proton exchange membrane fuel cells(PEMFCs)are reckoned to be promising alternative devices for energy ***,commercial PEMFCs mainly use H_(2) as the fuel,but the challenges in generation,storage,and handling of H_(2) limit their further *** the liquid fuels,formic acid possesses the merits of low flammability,low toxicity,slow crossover rate,faster reaction kinetics,and high volumetric H_(2) storage capacity,thus being considered as the most promising energy *** can be used as the energy source for direct formic acid fuel cells(DFAFCs)and formic acidbased H_(2)-PEMFCs,which are also called indirect formic acid fuel cells(IFAFCs).A common issue hindering their commercialization is lacking efficient *** DFAFCs,the anodic electrocatalysts for formic acid oxidation are suffering from stability issue,whereas the cathodic electrocatalysts for oxygen reduction are prone to poisoning by the permeated formic *** for IFAFCs,CO and CO_(2) impurities generated from formic acid dehydrogenation will cause rapid decay in the catalytic *** working temperature can improve the CO and CO_(2) tolerance of catalysts but will accelerate catalyst *** review will discuss the mitigation strategies and recent advances from the aspect of electrocatalysts to overcome the above ***,some perspectives and future research directions to develop more efficient electrocatalysts will be provided for this promising field.

关键词： field. overcome kinetics

Active plane modulation of Bi_(2)O_(3)nanosheets via Zn substitution for efficient electrocatalytic CO_(2)reduction to formic acid

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Nano Research 2023年第8期16卷 10803-10809页

作者： Yumei Liu Tiantian Wu hongfei cheng Jiawen Wu Xiaodong Guo Hong Jin Fan College of Chemical Engineering Sichuan UniversityChengdu 610065China School of Physical and Mathematical Sciences Nanyang Technological UniversitySingapore 637371Singapore School of Chemistry Xi’an Key Laboratory of Sustainable Energy Materials ChemistryState Key Laboratory of Electrical Insulation and Power EquipmentXi’an Jiaotong UniversityXi’an 710049China Institute of Materials Research and Engineering A*STAR2 Fusionopolis WaySingapore 138634Singapore

Formic acid is considered one of the most economically viable products for electrocatalytic CO_(2)reduction reaction(CO_(2)RR).However,developing highly active and selective electrocatalysts for effective CO_(2)conversion remains a grand ***,we report that structural modulation of the bismuth oxide nanosheet via Zn^(2+)cooperation has a profound positive effect on exposure of the active plane,thereby contributing to high electrocatalytic CO_(2)RR *** obtained Zn-Bi_(2)O_(3)catalyst demonstrates superior selectivity towards formate generation in a wide potential range;a high Faradaic efficiency of 95%and a desirable partial current density of around 20 mA·cm^(-2)are obtained at−0.9 V(*** hydrogen electrode(RHE)).As proposed by density functional theory calculations,Zn substitution is the most energetically feasible for forming and stabilizing the key OCHO*intermediate among the used metal ***,the more negative adsorption energy of OCHO*and the relatively low energy barrier for the desorption of HCOOH*are responsible for the enhanced activity and selectivity.

关键词： electrocatalytic CO_(2)reduction Bi_(2)O_(3)catalyst active plane modulation Zn substitution high selectivity

Recent advances in bismuth vanadate-based photocatalysts for photoelectrochemical water splitting

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Chinese Chemical Letters 2021年第6期32卷 1869-1878页

作者： Lina Wang Xiaoqiang Shi Yuefa Jia hongfei cheng Lei Wang Qizhao Wang School of Water and Environment Key Laboratory of Subsurface Hydrology and Ecological Effects in Arid Region of Ministry of EducationChang'an UniversityXi'an 710054China College of Chemistry and Chemical Engineering Northwest Normal UniversityLanzhou 730070China

Photoelectrochemical(PEC)technology is considered to be a promising approach for solar-driven hydrogen production with zero *** vanadate(BiVO_(4))is a kind of photocatalytic material with strong photoactivity in the visible light region and appropriate band gap for PEC water ***,the solar-to-hydrogen efficiency(STH)of BiVO_(4)is far away from the 10%target needed for practical application due to its poor charge separation ***,this review attempts to summarize the strategies for improving the photocurrent density and especially hydrogen production of BiVO_(4)materials through PEC techniques in the last three years,such as doping nonmetal and metal elements,depositing noble metals,constructing heterojunctions,coupling with carbon and metalorganic framework(MOF)materials to further enhance the PEC performance of BiVO_(4)*** review aims to serve as a general guideline to fabricate highly efficient BiVO_(4)-based materials for PEC water splitting.

关键词： Bismuth vanadate(BiVO_(4)) Photoelectrochemical Water splitting Hydrogen production Heterojunctions

Ionic Bent Shape Ternary Facial Amphiphiles

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Chinese Journal of Chemistry 2013年第6期31卷 839-844页

作者： Chixian He Qingye He Sijing Zhang Xiaoping Tan hongfei Gao Xiaohong cheng School of Chemistry and Material Engineering Yunnan University Yunnan 650091 China

Novel bent shape tenary facial amphiphilic imidazolium ILC which consist of a ^-conjugated bent aromatic cores （2,5-dithiophenylethynyl phenyl bent core）, two terminal poliphilic alkyl chains and lateral n-alky chain terminated by an imidazolium bromide unit were synthesized by using Kumada and Sonogashira coupling reactions as key steps and both their thermotropic and lyotropic mesophase behaviors were studied by POM, DSC and XRD. Columnar phases were found in these compounds, a hexagonal cylinder model with core shell structure is supposed for the columnar phase formed by compound 1/8. Our study may provide a new strategy for designing new LC functional material.

关键词： C--C-coupling reaction facial amphiphilic ionic liquid crystal bent shape columnar phase

Frontiers in Coal-related Resources——introduction to the special issue

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Frontiers of Earth Science 2023年第1期17卷 1-3页

作者： Dameng LIU Shen JIAN hongfei cheng Yidong CAI Guangyao SI School of Energy Resource China University of GeosciencesBeijing 100083China Key Laboratory of Coalbed Methane Resources and Reservoir Formation Process(Ministry of Education) China University of Mining and TechnologyXuzhou 221008China School of Earth Science and Resources Chang’an UniversityXi’an 710054China School of Minerals and Energy Resources Engineering University of New South WalesSydneyNSW 2052Australia

Coal-related resources, as a popular development in recent years, is the focus of research in the field of coalbed methane (CBM), coal measure gases, coal-associated rare earth resources and nonmetallic minerals (Moore, 2012;Dai and Finkelman, 2018;Qin et al., 2018). Due to its complexity in concentration, occurrence and exploitation, many key issues need to be addressed (Sayed et al., 2017;Bera et al., 2022;Liu et al., 2022).

关键词： minerals coalbed gases

Two-dimensional covalent organic framework nanosheets:Synthesis and energy-related applications

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Chinese Chemical Letters 2022年第6期33卷 2867-2882页

作者： Liangjun Chen Minchu Huang Bo Chen chengtao Gong Nanjun Li hongfei cheng Ye Chen Yongwu Peng Guodong Xu College of Materials Science and Engineering Zhejiang University of TechnologyHangzhou 310014China Department of Chemistry City University of Hong KongHong KongChina Department of Chemistry The Chinese University of Hong KongHong KongChina School of Chemistry and Environmental Engineering Yancheng Teachers UniversityYancheng 224007China Institute of Materials Research and Engineering A'STAR(Agency for Science Technology and Research)Innovis 138634Singapore

Two-dimensional(2D)covalent organic framework nanosheets(CONs)are attracting increasing research attention because of their unique properties derived from their ultrathin thickness,high surface-tovolume atomic ratio,and extremely large surface area.2D CONs can provide high transport pathways for charge carriers(e.g.,electrons,holes and ions)through either the conjugated skeletons or the open ***,they have shown great potential in energy related *** this review,we firstly introduce the recent developments and characteristics of 2D CONs by focusing on the two typical synthetic methods,i.e.,top-down and bottom-up ***,the energy-related applications in energy storage and conversion of 2D CONs are ***,we give our personal views on the challenges and perspectives for the future research of 2D CONs and their composites.

关键词： Covalent organic framework nanosheets Top-down method Bottom-up method Batteries Photocatalysts Electrocatalysts

Aging amorphous/crystalline heterophase PdCu nanosheets for catalytic reactions

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National Science Review 2019年第5期6卷 955-961页

作者： hongfei cheng Nailiang Yang Xiaozhi Liu Qinbai Yun Min Hao Goh Bo Chen Xiaoying Qi Qipeng Lu Xiaoping Chen Wen Liu Lin Gu Hua Zhang Center for Programmable Materials School of Materials Science and EngineeringNanyang Technological University State Key Laboratory of Biochemical Engineering Institute of Process Engineering Chinese Academy of Sciences Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences School of Physical Sciences University of Chinese Academy of Sciences Singapore Institute of Manufacturing Technology A*STAR School of Materials Science and Engineering University of Science and Technology Beijing School of Chemical and Biomedical Engineering Nanyang Technological University Songshan Lake Materials Laboratory Department of Chemistry City University of Hong Kong

Phase engineering is arising as an attractive strategy to tune the properties and functionalities of *** particular, amorphous/crystalline heterophase nanostructures have exhibited some intriguing ***, the one-pot wet-chemical synthesis of two types of amorphous/crystalline heterophase Pd Cu nanosheets is reported, in which one is amorphous phase-dominant and the other one is crystalline *** the aging process of the synthesized Pd Cu nanosheets is studied, during which their crystallinity increases, accompanied by changes in some physicochemical *** a proof-of-concept application, their aging effect on catalytic hydrogenation of 4-nitrostyrene is *** a result, the amorphous phase-dominant nanosheets initially show excellent *** aging for 14 days, their catalytic activity is higher than that of crystalline phase-dominant *** work demonstrates the intriguing properties of heterophase nanostructures, providing a new platform for future studies on the regulation of functionalities and applications of nanomaterials by phase engineering.

关键词： amorphous/crystalline heterophase nanosheets aging selective hydrogenation catalysis

A General Method for the Synthesis of Hybrid Nanostructures Using MoSe_(2) Nanosheet-Assembled Nanospheres as Templates

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Research 2019年第1期2019卷 167-176页

作者： Shikui Han Kai Zhou Yifu Yu Chaoliang Tan Junze Chen Ying Huang Qinglang Ma Ye Chen hongfei cheng Weijia Zhou Hua Zhang Key Laboratory of Advanced Catalytic Materials and Reaction Engineering School of Chemistry and Chemical EngineeringHefei University of TechnologyHefei 230009China Center for Programmable Materials School of Materials Science and EngineeringNanyang Technological University50 Nanyang AvenueSingapore 639798 Center for Advanced Analytical Science School of Chemistry and Chemical EngineeringGuangzhou UniversityGuangzhou 510006China New Energy Research Institute School of Environment and EnergySouth China University of TechnologyGuangzhou Higher Education Mega CenterGuangzhou 510006China Department of Chemistry City University of Hong KongTat Chee AvenueKowloonHong Kong

The layered transition metal dichalcogenides(TMDs)and transition metal phosphides are low-cost,earth-abundant,and robust electrocatalysts for hydrogen evolution reaction(HER).Integrating them into hybrid nanostructures is potentially promising to further boost the catalytic activity toward HER based on their synergistic ***,we report a general method for the synthesis of a series of MoSe_(2)-based hybrid nanostructures,including MoSe_(2)-Ni_(2)P,MoSe_(2)-Co_(2)P,MoSe_(2)-Ni,MoSe_(2)-Co,and MoSe_(2)-NiS,by postgrowth of Ni_(2)P,Co_(2)P,Ni,Co,and NiS nanostructures on the presynthesized MoSe_(2) nanosheet-assembled nanospheres,respectively,via a colloidal synthesis *** a proof-of-concept application,the as-synthesized hybrid nanostructures are used as electrocatalysts for HER,exhibiting high activity and stability in acidic *** them,the MoSe_(2)-Co_(2)P composite shows the highest HER activity with an overpotential of 167 mV at 10 mA cm^(-2).

关键词： method spheres synthesis