Low-Index Facet Polyhedron-Shaped Binary Cerium Titanium Oxide for High-Voltage Aqueous Zinc-Vanadium Redox Flow Batteries

被引:5
作者
Choi, Jinyeong [1 ,2 ,3 ]
Park, Joohyuk [4 ]
Park, Jihan [1 ,2 ,3 ]
Kim, Minsoo [1 ,2 ,3 ]
Lee, Soobeom [1 ,2 ,3 ]
Cho, Chae Ryong [1 ,3 ]
Lee, Jin Hong [6 ]
Park, Yiseul [7 ]
Kim, Min Gyu [5 ]
Choi, Jaewon [8 ]
Park, Jun-Woo [9 ,10 ]
Park, Minjoon [1 ,2 ,3 ]
机构
[1] Pusan Natl Univ, Dept Nanoenergy Engn, Busan 46241, South Korea
[2] Pusan Natl Univ, Res Ctr Energy Convergence Technol, Busan 46241, South Korea
[3] Pusan Natl Univ, Dept Nano Fus Technol, Busan 46241, South Korea
[4] Keimyung Univ, Dept Obstet & Gynecol, Daegu 42601, South Korea
[5] Pohang Univ Sci & Technol POSTECH, PLS II Dept, PLS II Beamline Div, Pohang Accelerator Lab PAL, Pohang 37673, South Korea
[6] Pusan Natl Univ, Sch Chem Engn, Busan 46241, South Korea
[7] Pukyong Natl Univ, Dept Chem Engn, Busan 48513, South Korea
[8] Kyungpook Natl Univ, Dept Polymer Sci & Engn, Daegu 41566, South Korea
[9] Korea Electrotechnol Res Inst KERI, Next Generat Battery Res Ctr, Chang Won 51543, Gyeongsangnam D, South Korea
[10] Univ Sci & Technol UST, Dept Electrofunct Mat Engn, Daejeon 34113, South Korea
基金
新加坡国家研究基金会;
关键词
redox flow battery; energy storage; electrocatalyst; aqueous battery; binary oxide; HIGH-PERFORMANCE ELECTRODE; DECORATED GRAPHITE FELT; HIGH-ENERGY DENSITY; NEGATIVE ELECTRODE; GRAPHENE OXIDE; ELECTROCATALYTIC PERFORMANCE; FUNCTIONAL-GROUPS; CHARGE-CARRIERS; CARBON FELT; TIO2;
D O I
10.1021/acsami.3c11734
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
Aqueous zinc-vanadium hybrid redox flow battery systems are an efficient strategy to address the problems of low voltage and high cost of conventional all-vanadium redox flow batteries. However, the low electrochemical activity of carbon-based electrodes toward a vanadium redox reaction limits the performance of redox flow batteries. In this study, polyhedral binary cerium titanium oxide (Ce2/3TiO3, CTO) is synthesized using molten salt synthesis. CTO is fabricated by adjusting the temperature and composition. Notably, the prepared CTO obtained at 1000 degrees C shows the highest catalytic activity for a VO2+/VO2+ redox reaction. Further, CTO is prepared as a composite electrocatalyst and applied to a high-voltage aqueous zinc-vanadium redox flow battery. The cell adopts an alkali zinc electrolyte containing a Zn/[Zn(OH)(4)](2-) redox pair and exhibits a high operating voltage of 2.26 V. Remarkably, a zinc-vanadium redox flow battery using the composite electrocatalyst exhibits a high energy density of 42.68 Wh L-1 at 20 mA cm(-2) and an initial voltage efficiency of 90.3%. The excellent cell performance is attributed to structural defects caused by A-site deficiency in the perovskite oxide structure as well as oxygen vacancies resulting from the low valence state of the metal ion, which enhance the catalytic activity of the vanadium ions.
引用
收藏
页码:55692 / 55702
页数:11
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