Citation: Jialu Wang, Shenghong Kang, Xiaoguang Zhu, Guozhong Wang, Haimin Zhang. Highly ordered Nb₂O₅ nanochannel film with rich oxygen vacancies for electrocatalytic N₂ reduction: Inactivation and regeneration of electrode[J]. Chinese Chemical Letters, ;2021, 32(9): 2833-2836. doi: 10.1016/j.cclet.2021.01.020 shu

Highly ordered Nb₂O₅ nanochannel film with rich oxygen vacancies for electrocatalytic N₂ reduction: Inactivation and regeneration of electrode

Jialu Wang ^{a, b} ,
Shenghong Kang ^{a, *,} ,
Xiaoguang Zhu ^a ,
Guozhong Wang ^a ,
Haimin Zhang ^{a, *,}

a.
Key Laboratory of Materials Physics, Centre for Environmental and Energy Nanomaterials, Anhui Key Laboratory of Nanomaterials and Nanotechnology, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, China
b.
University of Science and Technology of China, Hefei 230026, China

shkang@issp.ac.cn

zhanghm@issp.ac.cn

Received Date: 26 September 2020
Revised Date: 19 November 2020
Accepted Date: 11 January 2021
Available Online: 15 January 2021

Figures(4)

We report the fabrication of highly ordered Nb₂O₅ nanochannel film (Nb₂O₅-NCF) onto niobium foil by an anodization method. After thermal treatment, the obtained Nb₂O₅-NCF with rich oxygen vacancies exhibits electrochemical N₂ reduction reaction (NRR) activity with an NH₃ yield rate of 2.52×10⁻¹⁰ mol cm^-2 s^-1 and a faradaic efficiency of 9.81% at −0.4 V (vs. RHE) in 0.1 mol/L Na₂SO₄ electrolyte (pH 3.2). During electrocatalytic NRR, the Nb₂O₅-NCF takes place electrochromism (EC), along with a crystalline phase transformation from pseudo hexagonal phase to hexagonal phase owing to H⁺ insertion. This results in the reduced NRR activity due to the decrease of oxygen vacancies of hexagonal phase Nb₂O₅, which can be readily regenerated by low-temperature thermal treatment or applying an anodic potential, showing superior recycling reproducibility.
- Niobium oxide (Nb₂O₅),
- Nitrogen (N₂) reduction reaction (NRR),
- Electrochromism,
- Oxygen vacancies,
- Phase transformation
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Highly ordered Nb₂O₅ nanochannel film with rich oxygen vacancies for electrocatalytic N₂ reduction: Inactivation and regeneration of electrode