期刊
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
卷 9, 期 28, 页码 9165-9176出版社
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.0c09118
关键词
aqueous magnesium-ion hybrid supercapacitors; bromide-ion additive; additional faradaic redox contribution; low-crystalline akhtenskite MnO2; high energy density storage devices
资金
- National Natural Science Foundation of China [21875068]
- Provincial Natural Science Foundation of Anhui [1908085ME120]
- Primary Research and Development Program of Anhui Province [201904a05020087]
The newly designed redox bromide-ion additive aqueous MHS (B-MHS) shows higher specific capacity and energy density compared to traditional MHS, thanks to the introduction of Br-3(-)/Br- redox additive. This study investigates the energy storage mechanism and interactive correlation between magnesium ion insertion/extraction and redox reaction in detail.
Recently, as a new type of hybrid supercapacitors, aqueous magnesium-ion hybrid supercapacitors (MHSs) have triggered continuous attention. Benefiting from the insertion/extraction processes of bivalent magnesium ions in the battery-type electrode, MHS offers the advantage of charging two electrons per ion into the battery-type material. However, the low energy density of reported MHSs is still unsatisfying for their practical applications. Herein, a novel redox bromide-ion additive aqueous MHS (B-MHS) has been designed via introducing the Br-3(-)/Br- redox additive in 1 M MgSO4 electrolyte to promote their energy density. The optimally designed B-MHS exhibits the highest specific capacity of 268.1 mA h g(-1) at a current density of 2 A g(-1) in a wide voltage range of 2.6 V (0-2.6 V). Also, the maximum energy density of 262.3 W h kg(-1) can be achieved at a power density of 1956.8 W kg(-1), which is better than that of MHS. Most importantly, the energy storage mechanism and interactive correlation between magnesium ion insertion/extraction and redox reaction (Br-3(-)/Br-) have been detailedly investigated. The proposed strategy provides a new route in promoting the energy density of MHS, which should be helpful in designing and constructing high-energy-density storage devices.
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