Supercapacitors

Supercapacitors

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Please wait a minute... For Selected: Download Citations EndNote Ris BibTeX Toggle Thumbnails Select Engineering Two-Dimensional Materials and Their Heterostructures as High-Performance Electrocatalysts Qiangmin Yu, Yuting Luo, Azhar Mahmood, Bilu Liu, Hui-Ming Cheng Electrochemical Energy Reviews    2019, 2 (3): 373-394.   DOI: 10.1007/s41918-019-00045-3 Abstract （1294）            Knowledge map    Save Electrochemical energy conversion between electricity and chemicals through electrocatalysis is a promising strategy for the development of clean and sustainable energy sources. This is because efcient electrocatalysts can greatly reduce energy loss during the conversion process. However, poor catalytic performances and a shortage in catalyst material resources have greatly restricted the widespread applications of electrocatalysts in these energy conversion processes. To address this issue, earth-abundant two-dimensional (2D) materials with large specifc surface areas and easily tunable electronic structures have emerged in recent years as promising high-performance electrocatalysts in various reactions, and because of this, this review will comprehensively discuss the engineering of these novel 2D material-based electrocatalysts and their associated heterostructures. In this review, the fundamental principles of electrocatalysis and important electrocatalytic reactions are introduced. Following this, the unique advantages of 2D material-based electrocatalysts are discussed and catalytic performance enhancement strategies are presented, including the tuning of electronic structures through various methods such as heteroatom doping, defect engineering, strain engineering, phase conversion and ion intercalation, as well as the construction of heterostructures based on 2D materials to capitalize on individual advantages. Finally, key challenges and opportunities for the future development of these electrocatalysts in practical energy conversion applications are presented. Full-text：https://link.springer.com/article/10.1007/s41918-019-00045-3/fulltext.html Related Articles | Metrics | Comments（0） Select Polymer Electrolytes for High Energy Density Ternary Cathode Material-Based Lithium Batteries Huanrui Zhang, Jianjun Zhang, Jun Ma, Gaojie Xu, Tiantian Dong, Guanglei Cui Electrochemical Energy Reviews    2019, 2 (1): 128-148.   DOI: 10.1007/s41918-018-00027-x Abstract （712）      PDF       Knowledge map    Save Layered transition metal oxides such as LiNixMnyCo1-x-yO2 and LiNixCoyAl1-x-yO2 (NCA) (referred to as ternary cathode material, TCM) are widely recognized to be promising candidates for lithium batteries (LBs) due to superior reversible capacities, high operating voltages and low production costs. However, despite recent progress toward practical application, commercial TCM-based lithium ion batteries (LIBs) sufer from severe issues such as the use of fammable and hazardous electrolytes, with one high profle example being the ignition of NCA-based LIBs used in Tesla Model S vehicles after accidents, which jeopardizes the future development of TCM-based LBs. Here, the need for TCM and fammable liquid electrolytes in TCM-based LBs is a major obstacle that needs to be overcome, in which conficting requirements for energy density and safety in practical application need to be resolved. To address this, polymer electrolytes have been demonstrated to be a promising solution and thus far, many polymer electrolytes have been developed for high-performance TCM-based LBs. However, comprehensive performances, especially long-term cycling capabilities, are still insufcient to meet market demands for electric vehicles, and moreover, comprehensive reviews into polymer electrolytes for TCM-based LBs are rare. Therefore, this review will comprehensively summarize the ideal requirements, intrinsic advantages and research progress of polymer electrolytes for TCM-based LBs. In addition, perspectives and challenges of polymer electrolytes for advanced TCM-based LBs are provided to guide the development of TCM-based power batteries. Full-text：https://link.springer.com/article/10.1007/s41918-018-00027-x Related Articles | Metrics | Comments（0） Select Boosting Microbial Electrocatalytic Kinetics for High Power Density: Insights into Synthetic Biology and Advanced Nanoscience Long Zou, Yan Qiao, Chang Ming Li Electrochemical Energy Reviews    2018, 1 (4): 567-598.   DOI: 10.1007/s41918-018-0020-1 Abstract （7949）      PDF       Knowledge map    Save Microbial electrochemical systems are able to harvest electricity or synthesize valuable chemicals from organic matters while simultaneously cleaning environmentally hazardous wastes. The sluggish extracellular electron transfer (EET) between "non-or poor-conductive" microbes and electrode involves both bio-and electrocatalytic processes but is one of the main impediments to fast microbial electrode kinetics. To boost EET, researches have been focused on engineering electrochemically active microbes, constructing a unique nanostructured electrode endowed with a large amount loading of microbes and enhancing biotic-abiotic interactions for rapid electrode kinetics. After surveys of fundamentals of microbial electrocatalysis, particularly the diverse EET mechanisms with discussions on scientifc insights, this review summarizes and discusses the recent advances in bioengineering highly active biocatalytic microbes and nanoengineering unique electrode nanostructures for signifcantly improved microbial EET processes. In particular, this review associated with our researches analyzes in more detail the EET pathways, which contain direct and mediated electron transfer. The confusion between the energy efciency and electron transfer rate is clarifed and the approaches to elevate the EET rate are further discussed. These discussions shed both theoretical and practical lights on further research and development of more high-performance microbial catalysts by using synthetic biology coupled with nanoengineering approach for high energy conversion efciency while achieving high power density for practical applications. The challenges and perspectives are presented. It is believed that a next wave of research of microbial electrochemical systems will produce a new generation of sustainable green energy technologies and demonstrate great promise in their broad applications and industrializations. Full-text：https://link.springer.com/article/10.1007/s41918-018-0020-1 Related Articles | Metrics | Comments（0） Cited: Baidu(1)