Steam-driven crystalline-amorphous coupling design of homogenous metal hydroxides for oxygen evolution reaction

Jinqiang Gao, Chen Qiu, Min Ju, Simeng Li, Rongxing Yu, Hongzhi Liu, Mingyu Hu, Jun Yu, Mei Hong*, Shihe Yang*

*Corresponding author for this work

Research output: Contribution to journalJournal articlepeer-review

5 Citations (Scopus)

Abstract

The crystalline-amorphous (c-a) structure is emerging as a promising design of oxygen evolution electrocatalysts. However, homogenous compositions and excellent stability are hindering further industrial applications. Only by using metal nitrates and methanol solvent, we provide an effective steam-driven strategy to directly fabricate c-a electrocatalysts. The division of methanol molecules establishes an experimental approach to analyze the targeted transformation from crystalline to c-a phase for monometallic nickel hydroxy-nitrates. Following, this design is successfully extended to the bimetallic NiFe layered double hydroxide (NiFe-LDH). The presence of Fe3+ not only effectively promotes electrochemical activity but also enhances adhesion to the nickel foam, conjuring up an ultra-active and ultra-stable NiFeA-S@NF electrocatalyst with an overpotential of 205 mV at 10 mA cm-2 and excellent 200 h stability at 500–1000 mA cm-2. In light of the above findings and preliminary scale-up experiment, this approach offers both fundamental and practical guidelines for other non-noble-metal-based electrocatalysts.

Original languageEnglish
Article number122165
JournalApplied Catalysis B: Environmental
Volume323
Early online date11 Nov 2022
DOIs
Publication statusPublished - Apr 2023

Scopus Subject Areas

  • Catalysis
  • Environmental Science(all)
  • Process Chemistry and Technology

User-Defined Keywords

  • Crystalline–amorphous coupling
  • Electrocatalysis
  • Methanol steam
  • Oxygen evolution reaction
  • Stability

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