Chromium phosphide nanoparticles embedded in porous nitrogen-/phosphorus-doped carbon as efficient electrocatalysts for a nitrogen reduction reaction

Jiayuan Yu, Bin Chang, Wanqiang Yu, Xiao Li, Dufu Wang, Zhinian Xu, Xiaoli Zhang, Hong Liu, Weijia Zhou*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

21 Scopus citations

Abstract

The resource recovery of heavy metals from effluent has significant environmental implications and potential commercial value. Chromium phosphide nanoparticles embedded in a nitrogen-/phosphorus-doped porous carbon matrix (CrP/NPC) are synthesized via a consecutive Cr6+ leachate treatment and resource recovery process. Electrochemical testing shows that CrP/NPC shows excellent nitrogen reduction reaction (NRR) performance, which yields the highest NH3 production rate of 22.56 μg h−1 mg−1cat. and Faradaic efficiency (16.37%) at −0.5 V versus the reversible hydrogen electrode in a 0.05 M Na2SO4 aqueous solution, as well as robust catalytic stability. The isotopic experiments using 15N2 as a nitrogen source confirm that the detected NH3 is derived from the NRR process. Finally, density functional theory (DFT) calculations show that the electron deficiency environment of the Cr site can significantly reduce the barrier of the NRR process and promote the formation of intermediate species.

Original languageEnglish (US)
Pages (from-to)237-245
Number of pages9
JournalCarbon Energy
Volume4
Issue number2
DOIs
StatePublished - Mar 2022

Keywords

  • biosynthesis
  • carbon-based materials
  • chromium phosphide
  • leachate treatment
  • nitrogen reduction reaction
  • resource recovery

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Materials Science (miscellaneous)
  • Energy (miscellaneous)
  • Materials Chemistry

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