Developing terpyridine-based metal complexes for non-aqueous redox flow batteries

Liu，Bin1; Tang，Chun Wai2; Wei，Wei2; Zhang，Cheng1,3; Jia，Guochen2; Zhao，Tianshou1,4

2023-06-01

10.1016/j.ensm.2023.102808

Energy Storage Materials   影响因子和分区

2405-8297

2405-8297

This paper describes the design and synthesis of a series of terpyridine-based complexes of the first-row transition metals Cr, Mn, Fe, and Co for non-aqueous redox flow batteries (NARFBs). Electrochemical studies reveal that these complexes can undergo multi-electron transfer redox reactions. In particular, the Mn and Fe-based complexes exhibit both low negative redox potentials and high positive redox potential, permitting them to serve as a bipolar electrolyte for symmetric RFBs with a cell voltage of more than 2 V. The solubility of these complexes can be effectively improved by incorporating a polyether substituent on the terpyridine ligand and counter anion optimization. The iron complex [Fe(tpy-O(CHCHO)CH)][TFSI] shows a high solubility of 0.76 M in MeCN. The fabricated iron-based symmetric NARFB demonstrates a superior battery performance with a high cell voltage of 2.3 V, columbic efficiency of 97%, energy efficiency as high as 88%, and stable charge-discharge capacity retention of 60% after 160 cycles, corresponding to 99.75 % capacity retention per cycle. The post-cycling cyclic voltammetry (CV), UV-Vis, and H-NMR characterizations indicate only minor chemical decomposition of the cycled complex, confirming its good charging-discharging stability.

Bipolar Metal coordination complexes Non-aqueous redox flow batteries Symmetric flow battery Terpyridine

SCI ; EI

英语

通讯

Research Grants Council of the Hong Kong Special Administrative Re-gion, China[T23-601/17-R] ; China Postdoctoral Program[239485]

Chemistry ; Science & Technology - Other Topics ; Materials Science

Chemistry, Physical ; Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary

WOS:001006778900001

ELSEVIER

20232114115246

Chemical stability ; Coordination reactions ; Cyclic voltammetry ; Electrolytes ; Energy efficiency ; Iron compounds ; Manganese compounds ; Metal complexes ; Redox reactions ; Solubility ; Synthesis (chemical) ; Transition metals

Energy Conservation:525.2 ; Metallurgy and Metallography:531 ; Electric Batteries and Fuel Cells:702 ; Secondary Batteries:702.1.2 ; Chemistry:801 ; Physical Chemistry:801.4 ; Electrochemistry:801.4.1 ; Chemical Reactions:802.2 ; Chemical Agents and Basic Industrial Chemicals:803 ; Chemical Products Generally:804 ; Inorganic Compounds:804.2

2-s2.0-85159471942

Scopus

1.Department of Mechanical and Aerospace Engineering,The Hong Kong University of Science and Technology,Hong Kong SAR,China
2.Department of Chemistry,The Hong Kong University of Science and Technology,Hong Kong SAR,China
3.HKUST Fok Ying Tung Research Institute,Guangzhou,China
4.Department of Mechanical and Energy Engineering,Southern University of Science and Technology,Shenzhen,518055,China

Liu，Bin,Tang，Chun Wai,Wei，Wei,et al. Developing terpyridine-based metal complexes for non-aqueous redox flow batteries[J]. Energy Storage Materials,2023,60.

Liu，Bin,Tang，Chun Wai,Wei，Wei,Zhang，Cheng,Jia，Guochen,&Zhao，Tianshou.(2023).Developing terpyridine-based metal complexes for non-aqueous redox flow batteries.Energy Storage Materials,60.

Liu，Bin,et al."Developing terpyridine-based metal complexes for non-aqueous redox flow batteries".Energy Storage Materials 60(2023).