A highly activated iron phosphate over-layer for enhancing photoelectrochemical ammonia decomposition

Chengkai Xia, Yuankai Li, Heeho Kim, Kyeongseo Kim, Woo Seok Choe, Jung Kyu Kim, Jong Hyeok Park

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1 Citation (Scopus)

Abstract

Environmentally friendly ammonia (NH3) decomposition has attracted a lot of interests in recent years to resolve the issue of water eutrophication from a wastewater and achieve a clean H2 storage. Here, we report a novel strategy for solar-driven ammonia decomposition by introducing a highly-activated iron phosphate (FePi) over-layer on the surface of α-Fe2O3 nanorods photoanode (FePi/Fe2O3), and innovatively propose a photoelectrochemical (PEC) ammonia degradation system with enhanced performance. After a facile electrochemical (EC) activation, the FePi over-layer is converted into FeOOH. The EC-activated over-layer provides the efficient active sites for the ammonia adsorption process, which promotes the high catalytic kinetics for ammonia oxidation reaction (AOR). Due to the synergistic effect of the electrocatalytic and the photocatalytic process, the FePi/Fe2O3 exhibits the enhanced PEC AOR performance, which competes with water oxidation reaction (WOR). Comparing to the initial concentration of ammonia, the FePi/Fe2O3 achieves a 54.4% ammonia degradation rate within 3 h at 1.23 V vs. reversible hydrogen electrode (RHE) under 1 sun illumination, which demonstrates the reliable ammonia decomposition performance. This study confirms that it is feasible to achieve PEC ammonia decomposition in an aqueous solution without chloride mediators and provides a promising strategy for the harmless treatment of ammonia wastewater.

Original languageEnglish
Article number124900
JournalJournal of Hazardous Materials
Volume408
DOIs
Publication statusPublished - 2021 Apr 15

Bibliographical note

Funding Information:
This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Ministry of Science, ICT and Future Planning, Republic of Korea (2019R1F1A1041822 and 2020R1A2C2006077). J. H. Park acknowledges the support from NRF of Korea (2019R1A2C3010479, 2017M3A7B4041987, 2019R1A4A1029237).

Funding Information:
This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Ministry of Science, ICT and Future Planning, Republic of Korea ( 2019R1F1A1041822 and 2020R1A2C2006077 ). J. H. Park acknowledges the support from NRF of Korea ( 2019R1A2C3010479 , 2017M3A7B4041987 , 2019R1A4A1029237 ).

Publisher Copyright:
© 2020 Elsevier B.V.

All Science Journal Classification (ASJC) codes

  • Environmental Engineering
  • Environmental Chemistry
  • Waste Management and Disposal
  • Pollution
  • Health, Toxicology and Mutagenesis

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