Bifunctional Catalytic Activity of γ-NiOOH toward Oxygen Reduction and Oxygen Evolution Reactions in Alkaline Solutions

Putra, Ridwan P.; Rachman, Ihsan Budi; Horino, Hideyuki; Rzeznicka, Izabela I.

doi:10.3390/oxygen2040031

Open AccessArticle

Bifunctional Catalytic Activity of γ-NiOOH toward Oxygen Reduction and Oxygen Evolution Reactions in Alkaline Solutions

by

Ridwan P. Putra

¹

,

Ihsan Budi Rachman

¹,

Hideyuki Horino

^2,*

and

Izabela I. Rzeznicka

^1,*

¹

Graduate School of Engineering and Science, Shibaura Institute of Technology, 3-7-5 Toyosu Koto-ku, Tokyo 135-8548, Japan

²

Tohoku University, 2-1-1 Katahira, Aoba-ku, Miyagi 980-8577, Japan

^*

Authors to whom correspondence should be addressed.

Oxygen 2022, 2(4), 479-492; https://doi.org/10.3390/oxygen2040031

Submission received: 23 September 2022 / Revised: 10 October 2022 / Accepted: 10 October 2022 / Published: 13 October 2022

(This article belongs to the Special Issue Feature Papers in Oxygen)

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Abstract

Nickel oxyhydroxides (NiOOHs) are well-known for their superior activity toward oxygen evolution reaction (OER) in alkaline solutions. However, their activity toward oxygen reduction reaction (ORR) has been largely unexplored. There exist three NiOOH polymorphs: α-, β-, and γ-NiOOH, characterized by different interlayer spacing. Although still debated, γ-NiOOH with a large layer spacing has been indicated as the active phase for OER. Here, a highly crystalline γ-NiOOH was prepared in a carbon matrix by the in situ electrochemical transformation of nickel dithiooxamide Ni(dto) in 1 M KOH solution. The catalyst prepared in this way showed low overpotential not only for OER, but also for ORR in alkaline solutions. The onset potential for ORR is ~0.81 V vs. RHE, and the reaction proceeds via the 2e⁻ transfer pathway. The high OER catalytic activity and relatively low ORR overpotential make this nanocomposite catalyst a good candidate for bifunctional OER/ORR catalyst, stable in alkaline solutions.

Keywords: oxygen reduction reaction; oxygen evolution reaction; nickel oxyhydroxide; chelate polymer; bifunctional electrocatalyst

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MDPI and ACS Style

Putra, R.P.; Rachman, I.B.; Horino, H.; Rzeznicka, I.I. Bifunctional Catalytic Activity of γ-NiOOH toward Oxygen Reduction and Oxygen Evolution Reactions in Alkaline Solutions. Oxygen 2022, 2, 479-492. https://doi.org/10.3390/oxygen2040031

AMA Style

Putra RP, Rachman IB, Horino H, Rzeznicka II. Bifunctional Catalytic Activity of γ-NiOOH toward Oxygen Reduction and Oxygen Evolution Reactions in Alkaline Solutions. Oxygen. 2022; 2(4):479-492. https://doi.org/10.3390/oxygen2040031

Chicago/Turabian Style

Putra, Ridwan P., Ihsan Budi Rachman, Hideyuki Horino, and Izabela I. Rzeznicka. 2022. "Bifunctional Catalytic Activity of γ-NiOOH toward Oxygen Reduction and Oxygen Evolution Reactions in Alkaline Solutions" Oxygen 2, no. 4: 479-492. https://doi.org/10.3390/oxygen2040031

APA Style

Putra, R. P., Rachman, I. B., Horino, H., & Rzeznicka, I. I. (2022). Bifunctional Catalytic Activity of γ-NiOOH toward Oxygen Reduction and Oxygen Evolution Reactions in Alkaline Solutions. Oxygen, 2(4), 479-492. https://doi.org/10.3390/oxygen2040031

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Bifunctional Catalytic Activity of γ-NiOOH toward Oxygen Reduction and Oxygen Evolution Reactions in Alkaline Solutions

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