Sodium-nickel pyrophosphate as a novel oxygen evolution electrocatalyst in alkaline medium

Hee Jo Song; Hyunseok Yoon; Bobae Ju; Dong Wan Kim

doi:10.1111/jace.17195

Sodium-nickel pyrophosphate as a novel oxygen evolution electrocatalyst in alkaline medium

Hee Jo Song, Hyunseok Yoon, Bobae Ju, Dong Wan Kim

Research output: Contribution to journal › Article › peer-review

7 Citations (Scopus)

Abstract

The development of robust and low-cost oxygen evolution reaction (OER) electrocatalysts is a challenging issue in electrochemical water-splitting technology. Tailoring the electrocatalysts through nano- and composition engineering is an effective strategy to enhance the intrinsic and extrinsic electrocatalytic activities. In this study, for the first time, sodium-nickel pyrophosphate (Na₂NiP₂O₇) is proposed as a novel OER electrocatalyst in alkaline environment. First, the electrocatalytic performance of micron-sized Na₂NiP₂O₇ (Na₂NiP₂O₇-micron) is evaluated. In addition, nanoscale Na₂NiP₂O₇ (Na₂NiP₂O₇-nano) and Fe-substituted Na₂NiP₂O₇-nano (Na₂Ni₁₋_xFe_xP₂O₇-nano) are synthesized to improve the electrocatalytic performance of Na₂NiP₂O₇. Although Na₂NiP₂O₇-micron exhibits low electrocatalytic OER activity in alkaline medium, its catalytic activity can be significantly improved through reducing the particle size and substituting Fe in the Ni sites. The synthesized Na₂Ni_0.75Fe_0.25P₂O₇-nano exhibits optimal catalytic activity with an overpotential of 300 mV at a current density of 10 mA/cm² and long-term durability with continuous O₂ generation over 100 hours in alkaline medium.

Original language	English
Pages (from-to)	4748-4753
Number of pages	6
Journal	Journal of the American Ceramic Society
Volume	103
Issue number	9
DOIs	https://doi.org/10.1111/jace.17195
Publication status	Published - 2020 Sept 1

Bibliographical note

Funding Information:
This work is supported by the National Research Foundation of Korea (NRF) grant funded by the Ministry of Science and ICT, South Korea (2016M3A7B4909318) and by a Korea University Grant.

Publisher Copyright:
© 2020 American Ceramic Society (ACERS)

Keywords

NaNiPO
electrocatalyst
nanoparticle
oxygen evolution reaction

ASJC Scopus subject areas

Ceramics and Composites
Materials Chemistry

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1111/jace.17195

Cite this

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title = "Sodium-nickel pyrophosphate as a novel oxygen evolution electrocatalyst in alkaline medium",

abstract = "The development of robust and low-cost oxygen evolution reaction (OER) electrocatalysts is a challenging issue in electrochemical water-splitting technology. Tailoring the electrocatalysts through nano- and composition engineering is an effective strategy to enhance the intrinsic and extrinsic electrocatalytic activities. In this study, for the first time, sodium-nickel pyrophosphate (Na2NiP2O7) is proposed as a novel OER electrocatalyst in alkaline environment. First, the electrocatalytic performance of micron-sized Na2NiP2O7 (Na2NiP2O7-micron) is evaluated. In addition, nanoscale Na2NiP2O7 (Na2NiP2O7-nano) and Fe-substituted Na2NiP2O7-nano (Na2Ni1−xFexP2O7-nano) are synthesized to improve the electrocatalytic performance of Na2NiP2O7. Although Na2NiP2O7-micron exhibits low electrocatalytic OER activity in alkaline medium, its catalytic activity can be significantly improved through reducing the particle size and substituting Fe in the Ni sites. The synthesized Na2Ni0.75Fe0.25P2O7-nano exhibits optimal catalytic activity with an overpotential of 300 mV at a current density of 10 mA/cm2 and long-term durability with continuous O2 generation over 100 hours in alkaline medium.",

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author = "Song, {Hee Jo} and Hyunseok Yoon and Bobae Ju and Kim, {Dong Wan}",

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AU - Ju, Bobae

AU - Kim, Dong Wan

N1 - Funding Information: This work is supported by the National Research Foundation of Korea (NRF) grant funded by the Ministry of Science and ICT, South Korea (2016M3A7B4909318) and by a Korea University Grant. Publisher Copyright: © 2020 American Ceramic Society (ACERS)

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N2 - The development of robust and low-cost oxygen evolution reaction (OER) electrocatalysts is a challenging issue in electrochemical water-splitting technology. Tailoring the electrocatalysts through nano- and composition engineering is an effective strategy to enhance the intrinsic and extrinsic electrocatalytic activities. In this study, for the first time, sodium-nickel pyrophosphate (Na2NiP2O7) is proposed as a novel OER electrocatalyst in alkaline environment. First, the electrocatalytic performance of micron-sized Na2NiP2O7 (Na2NiP2O7-micron) is evaluated. In addition, nanoscale Na2NiP2O7 (Na2NiP2O7-nano) and Fe-substituted Na2NiP2O7-nano (Na2Ni1−xFexP2O7-nano) are synthesized to improve the electrocatalytic performance of Na2NiP2O7. Although Na2NiP2O7-micron exhibits low electrocatalytic OER activity in alkaline medium, its catalytic activity can be significantly improved through reducing the particle size and substituting Fe in the Ni sites. The synthesized Na2Ni0.75Fe0.25P2O7-nano exhibits optimal catalytic activity with an overpotential of 300 mV at a current density of 10 mA/cm2 and long-term durability with continuous O2 generation over 100 hours in alkaline medium.

AB - The development of robust and low-cost oxygen evolution reaction (OER) electrocatalysts is a challenging issue in electrochemical water-splitting technology. Tailoring the electrocatalysts through nano- and composition engineering is an effective strategy to enhance the intrinsic and extrinsic electrocatalytic activities. In this study, for the first time, sodium-nickel pyrophosphate (Na2NiP2O7) is proposed as a novel OER electrocatalyst in alkaline environment. First, the electrocatalytic performance of micron-sized Na2NiP2O7 (Na2NiP2O7-micron) is evaluated. In addition, nanoscale Na2NiP2O7 (Na2NiP2O7-nano) and Fe-substituted Na2NiP2O7-nano (Na2Ni1−xFexP2O7-nano) are synthesized to improve the electrocatalytic performance of Na2NiP2O7. Although Na2NiP2O7-micron exhibits low electrocatalytic OER activity in alkaline medium, its catalytic activity can be significantly improved through reducing the particle size and substituting Fe in the Ni sites. The synthesized Na2Ni0.75Fe0.25P2O7-nano exhibits optimal catalytic activity with an overpotential of 300 mV at a current density of 10 mA/cm2 and long-term durability with continuous O2 generation over 100 hours in alkaline medium.

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Sodium-nickel pyrophosphate as a novel oxygen evolution electrocatalyst in alkaline medium

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

UN SDGs

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