Corrosion-assisted large-scale production of hierarchical iron rusts/Ni(OH)2 nanosheet-on-microsphere arrays for efficient electrocatalysis

Xupo Liu, Xuyun Guo, Mingxing Gong, Shaofeng Deng, Jianing Liang, Tonghui Zhao, Yun Lu, Ye Zhu, Jian Zhang, Deli Wang

Research output: Journal article publicationJournal articleAcademic researchpeer-review

3 Citations (Scopus)

Abstract

Iron corrosion is always harmful to our industrial manufacture and thus numerous effects have been conducted for corrosion protection. However, the detrimental corrosion may be applied to produce serviceable materials, resulting in “upcycling waste into wealth”. Herein, a novel corrosion engineering is employed to fabricate hierarchical iron rusts/Ni(OH)2 nanosheet-on-microsphere arrays as effective oxygen evolution reaction (OER) electrocatalysts. Through physically mixing the fabricated ultrathin iron rusts with Ni(OH)2 microspheres, the as-prepared catalyst requires an overpotential of only 318 mV to achieve the current density of 20 mA cm−2. Besides, negligible increasement of overpotential is observed after continuous chronopotentiometric determination for 30 h. The excellent OER property is attributed to the formed oxygen bridges of Fe–O–Ni on the solid-solid contact sites, which promote oxidation of Ni2+ specieses via the interfacial Fe3+ of iron rusts (FeOOH). In particular, a large-scale production of 2.968 g iron rusts/Ni(OH)2 catalysts was successfully prepared by using this simple, lowcost yet valid corrosion engineering. This work provides a novel avenue towards large-scale production of efficient OER catalysts by combing with corrosion science, which is beneficial for boosting the progress of water splitting.

Original languageEnglish
Article number136478
JournalElectrochimica Acta
Volume353
DOIs
Publication statusPublished - 1 Sep 2020

Keywords

  • Corrosion engineering
  • electrocatalyst
  • Iron rusts/Ni(OH)
  • Large-scale production
  • Oxygen evolution reaction

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Electrochemistry

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