Electrocatalytic Selenium Redox Reaction for High-Mass-Loading Zinc-Selenium Batteries with Improved Kinetics and Selenium Utilization

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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Author(s)

  • Yiran Ying
  • Hongfei Li
  • Haitao Huang
  • Lingzhi Zhao

Detail(s)

Original languageEnglish
Article number2201322
Journal / PublicationAdvanced Energy Materials
Volume12
Issue number26
Online published26 May 2022
Publication statusPublished - 14 Jul 2022

Abstract

Batteries usually deliver mass loading-dependent electrochemical performance. Taking the selenium cathode as an example, the Se reaction kinetics, utilization, and cycling lifespan seriously deteriorate with increased Se mass loading. Here, an electrocatalytic Se reduction/oxidation reaction strategy to realize high-Se-loading Zn||Se batteries with fast kinetics and high Se utilization is proposed. Specifically, the synergetic effects of Cu and Co transition-metal species inside the channel structure of the host can effectively immobilize and catalytically convert Sen during cycling, which thus facilitates Se utilization and 6-electron (Se4+ ↔ Se2-) conversion kinetics. In particular, the Cu[Co(CN)6] host exhibits a remarkably low energy barrier (1.63 kJ mol-1) and low Tafel slope (95.23 mV dec-1) for the Se reduction, and the highest current response for Se oxidation. Accordingly, the Zn battery employing a Se-in-Cu[Co(CN)6] cathode delivers a capacity of 664.7 mAh g-1 at 0.2 A g-1, an excellent rate capability with 430.6 mAh g-1 achieved even at 10 A g-1, and long-cyclic life over 6000 cycles with 90.6% capacity retention. Furthermore, an A-h-level (≈1350 mAh) Zn||Se pouch-type battery with high Se loading (≈12.3 mg(Se) cm-2) shows a high Se utilization of 83.3% and outstanding cyclic stability with 89.4% initial capacity retained after 400 cycles at exceeding 98% Coulombic efficiency. © 2022 Wiley-VCH GmbH.

Research Area(s)

  • aqueous batteries, high areal capacity, high loading mass, Se reduction, Zn batteries, LITHIUM, STABILITY, CATHODE

Citation Format(s)

Electrocatalytic Selenium Redox Reaction for High-Mass-Loading Zinc-Selenium Batteries with Improved Kinetics and Selenium Utilization. / Ma, Longtao; Ying, Yiran; Chen, Shengmei et al.
In: Advanced Energy Materials, Vol. 12, No. 26, 2201322, 14.07.2022.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review