Porous Pd/NiFeOx Nanosheets Enhance the pH-Universal Overall Water Splitting

Wen Zhang, Xue Jiang, Zemeng Dong, Jing Wang, Ning Zhang, Jie Liu, Guang Rui Xu, Lei Wang

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

Modulating the morphology and chemical composition is an efficient strategy to enhance the catalytic activity for water splitting, since it is still a great challenge to develop a bifunctional catalyst for oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) over a wide pH range. Herein, Pd/NiFeOx nanosheets are synthesized with tightly arranged petal nanosheets and uniform mesoporous structure on nickel foam (NF). The porous 2D structure yields a larger surface area and exposes more active sites, facilitating water splitting at all pH values. The overpotential of Pd/NiFeOx nanosheets for OER is only 180, 169, and 310 mV in 1 m KOH, 0.5 m H2SO4, and 1 m phosphate-buffered saline (PBS) conditions at 10 mA cm−2 current density, as well as excellent HER activity with ultralow overpotential in a wide pH range. When using porous Pd/NiFeOx nanosheets as bifunctional catalysts for water splitting, it just required a cell voltage of 1.57 V to reach a current density of 20 mA cm−2 with nearly 100% faradic efficiency in alkaline conditions, which is much lower than that of benchmark Pt/CǁRuO2 (1.76 V) couples, along with the improving stability benefiting from the good corrosion resistance of the inner NiFeOx nanosheets.

Original languageEnglish (US)
Article number2107181
JournalAdvanced Functional Materials
Volume31
Issue number51
DOIs
StatePublished - Dec 16 2021
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

Keywords

  • 2D porous nanosheets, bifunctional electrocatalysts
  • oxygen evolution reaction
  • water splitting
  • wide pH range

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