High-Energy Efficiency Membraneless Flowless Zn-Br Battery: Utilizing the Electrochemical-Chemical Growth of Polybromides
| Autor: | Gyoung Hwa Jeong, Sang Ouk Kim, Hee-Tak Kim, Jiyun Kwen, Yearin Byun, Chanyong Choi, Ju-Hyuk Lee, Riyul Kim, In-Ho Kim |
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| Rok vydání: | 2019 |
| Předmět: |
Battery (electricity)
Materials science Aqueous solution Dopant Cost effectiveness Mechanical Engineering chemistry.chemical_element 02 engineering and technology Microporous material 010402 general chemistry 021001 nanoscience & nanotechnology Electrochemistry 01 natural sciences Energy storage 0104 chemical sciences chemistry Chemical engineering Mechanics of Materials General Materials Science 0210 nano-technology Carbon |
| Zdroj: | Advanced materials (Deerfield Beach, Fla.). 31(52) |
| ISSN: | 1521-4095 |
| Popis: | Aqueous Zn-Br batteries (ZBBs) offer promising next-generation high-density energy storage for energy storage systems, along with distinctive cost effectiveness particularly in membraneless and flowless (MLFL) form. Unfortunately, they generally suffer from uncontrolled diffusion of corrosive bromine components, which cause serious self-discharge and capacity fade. An MLFL-ZBB is presented that fundamentally tackles the problem of bromine crossover by converting bromine to the polybromide anion using protonated pyridinic nitrogen doped microporous carbon decorated on graphite felt (NGF). The NGF electrodes efficiently capture bromine and polybromide anions at the abundant protonated nitrogen dopant sites within micropores and facilitate effective conversion of bromine into polybromides through electrochemical-chemical growth mechanism. The MLFL-ZBBs with NGF exhibit an extraordinary stability over 1000 charge/discharge cycles, with an energy efficiency over 80%, the highest value ever reported among membraneless Zn-Br batteries. Judicious engineering of an atomistically designed nanostructured electrode offers a novel design platform for low cost, high voltage, long-life cycle aqueous hybrid Zn-Br batteries. |
| Databáze: | OpenAIRE |
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