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

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)
JournalAdvanced Functional Materials
DOIs
StateAccepted/In press - 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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