Remarkable Enhancement of Electrochemical Performance by the Oxygen Vacancy and Nitrogen Doping in ZnCo2O4 Nanowire Arrays

In Kyu Moon, Seonno Yoon, Bugeun Ki, Kerock Choi, Jungwoo Oh

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

To improve overall electrochemical performance, we report and propose zinc cobaltite (ZnCo2O4) nanowire arrays with a simple and precisely controllable NH3 plasma treatment. The NH3 plasma treatment effectively changes the electronic and chemical properties of the pristine ZnCo2O4 by the nitrogen doping and surface functionalization simultaneously. By way of the nanoscale surface/electrical modification of ZnCo2O4, the nitrogen (N)-doped ZnCo2O4 electrodes not only significantly enhanced the electrical conductivity but also increased the density of the hydroxyl group by appropriately controlling the Co2+/Co3+ ratio (oxygen vacancies). Compared to pristine ZnCo2O4 (1682.2 F g-1 at 5 A g-1), the N-doped ZnCo2O4 electrode without conductive additives possessed high specific capacitance (3804.6 F g-1 at 5 A g-1), excellent rate capability (95.45% capacity retention at 40 A g-1), and good cycling stability (only 3.3% loss after 3000 cycles at 30 A g-1). These nanoscale surface state engineering methods may open a new avenue to optimize electrochemical performance for energy storage and conversion.

Original languageEnglish
Pages (from-to)4804-4813
Number of pages10
JournalACS Applied Energy Materials
Volume1
Issue number9
DOIs
Publication statusPublished - 2018 Sep 24

All Science Journal Classification (ASJC) codes

  • Chemical Engineering (miscellaneous)
  • Energy Engineering and Power Technology
  • Electrochemistry
  • Materials Chemistry
  • Electrical and Electronic Engineering

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