Two-dimensional nickel hydroxide nanosheets with high-content of nickel(III) species towards superior urea electro-oxidation

Dongsheng Wang, Siwen Liu, Qiuping Gan, Jianniao Tian, Tayirjan Taylor Isimjan, Xiulin Yang*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

Development of high-efficient and stable electrocatalysts for urea oxidation reaction (UOR) is of a great challenge due to the sluggish kinetics of 6e transfer process. Here, we have developed a facile and easy-to-scale approach to fabricate two-dimensional Ni(III)-rich Ni(OH)2 nanosheets on amine-functionalized carbon (Ni3+-rich Ni(OH)2/C-NH2). Morphological characterizations confirm the existence of nanosheets, and XPS spectra indicate that the content of Ni3+ species in Ni3+-rich Ni(OH)2/C-NH2 (ca. 57.6%) is significantly higher than that of in Ni(OH)2/C-NH2 (ca. 43.1%) and Ni(OH)2/C (ca. 20.7%). Electrochemical analyses illustrate that the as-prepared Ni3+-rich Ni(OH)2/C-NH2 catalyst exhibits the highest current density (91.72 mA cm−2) at a potential of 0.61 V, which is 2.06-, 2.08- and 3.47-fold higher than that of Ni(OH)2/C-NH2, Ni(OH)2/C and Pt/C, respectively. Moreover, the Ni3+-rich Ni(OH)2/C-NH2 catalyst also demonstrates an outstanding voltammetric cycles and long-term chronoamperometric stability. The superior electrocatalytic activity and stability could be ascribed to the synergistic effect of Ni3+ doping as well as the amine-functionalized carbon, where higher concentration Ni3+ species in Ni(OH)2 sheets could provide more active sites for adsorption and transformation of urea molecules, while fluffy C-NH2 support could enhance the ability of solute diffusion, electron transport and gas emissions, thereby dramatically improve the catalytic activity.

Original languageEnglish (US)
Pages (from-to)81-87
Number of pages7
JournalJournal of Electroanalytical Chemistry
Volume829
DOIs
StatePublished - Nov 15 2018

Keywords

  • Electrocatalysis
  • Ni(III) rich
  • Ni(OH) sheets
  • Two-dimensional
  • Urea electro-oxidation

ASJC Scopus subject areas

  • Analytical Chemistry
  • Chemical Engineering(all)
  • Electrochemistry

Fingerprint Dive into the research topics of 'Two-dimensional nickel hydroxide nanosheets with high-content of nickel(III) species towards superior urea electro-oxidation'. Together they form a unique fingerprint.

Cite this