Dual Alkaline Ion Route to Chemical De-insertion in Oxygen Evolution Olivine Electrocatalysts

Yelena Gershinsky; Melina Zysler; Victor Shokhen; Yakov Stone; David Zitoun

doi:10.1021/acscatal.9b02532

Dual Alkaline Ion Route to Chemical De-insertion in Oxygen Evolution Olivine Electrocatalysts

Yelena Gershinsky
, Melina Zysler
, Victor Shokhen
, Yakov Stone
, David Zitoun

Department of Chemistry

Bar-Ilan University

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

11 Scopus citations

Abstract

The oxygen evolution reaction (OER) is an essential reaction for the sustainable synthesis of fuels from renewable feedstocks. In recent years, cathode materials for Li-ion batteries have been successfully utilized as OER electrocatalysts, and among them are the lithiated transition-metal phosphates possessing an olivine crystallographic phase. The LiMPO₄ (M = Ni, Fe, Co) olivine materials display a potentially suitable overpotential for OER, which can be further enhanced by delithiation. Herein, we report the synthesis of olivine phases with both Li and Na as alkaline ions. The combination of alkaline ions stabilizes the olivine structure with low alkaline ion content, which is instrumental to reach low OER overpotential. The dual alkaline ion approach has been demonstrated for a single transition metal (Co) as well as different combinations of Co-Fe-Ni to form olivine solid solutions of the chemical formula Li(Na)Co(Fe,Ni)PO₄. This screening of eight olivine materials revealed a trend in OER activity, and the Li_0.6Na_0.2Ni_0.7Fe_0.1PO₄ solid solution displays an overpotential as low as 0.28 V versus RHE at 10 mA cm^-2, with a low Tafel slope of 30 mV dec^-1 and a stability tested over 20 h.

Original language	English
Pages (from-to)	8355-8363
Number of pages	9
Journal	ACS Catalysis
Volume	9
Issue number	9
DOIs	https://doi.org/10.1021/acscatal.9b02532
State	Published - 6 Sep 2019

Bibliographical note

Publisher Copyright:
© 2019 American Chemical Society.

Funding

This work is partially supported by the Planning & Budgeting Committee of the Council of High Education and the Prime Minister Office of Israel, in the framework of the INREP project and by the Israel Ministry of Science and Technology through the Israel–South Korea bilateral grant.

Funders
Council of High Education
Israel Ministry of Science and Technology
Israel–South Korea
Prime Minister office of Israel

Keywords

electrocatalysis
electrolysis
olivine
oxygen evolution reaction
water splitting

UN SDGs

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

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10.1021/acscatal.9b02532

Cite this

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title = "Dual Alkaline Ion Route to Chemical De-insertion in Oxygen Evolution Olivine Electrocatalysts",

abstract = "The oxygen evolution reaction (OER) is an essential reaction for the sustainable synthesis of fuels from renewable feedstocks. In recent years, cathode materials for Li-ion batteries have been successfully utilized as OER electrocatalysts, and among them are the lithiated transition-metal phosphates possessing an olivine crystallographic phase. The LiMPO4 (M = Ni, Fe, Co) olivine materials display a potentially suitable overpotential for OER, which can be further enhanced by delithiation. Herein, we report the synthesis of olivine phases with both Li and Na as alkaline ions. The combination of alkaline ions stabilizes the olivine structure with low alkaline ion content, which is instrumental to reach low OER overpotential. The dual alkaline ion approach has been demonstrated for a single transition metal (Co) as well as different combinations of Co-Fe-Ni to form olivine solid solutions of the chemical formula Li(Na)Co(Fe,Ni)PO4. This screening of eight olivine materials revealed a trend in OER activity, and the Li0.6Na0.2Ni0.7Fe0.1PO4 solid solution displays an overpotential as low as 0.28 V versus RHE at 10 mA cm-2, with a low Tafel slope of 30 mV dec-1 and a stability tested over 20 h.",

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AU - Zitoun, David

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AB - The oxygen evolution reaction (OER) is an essential reaction for the sustainable synthesis of fuels from renewable feedstocks. In recent years, cathode materials for Li-ion batteries have been successfully utilized as OER electrocatalysts, and among them are the lithiated transition-metal phosphates possessing an olivine crystallographic phase. The LiMPO4 (M = Ni, Fe, Co) olivine materials display a potentially suitable overpotential for OER, which can be further enhanced by delithiation. Herein, we report the synthesis of olivine phases with both Li and Na as alkaline ions. The combination of alkaline ions stabilizes the olivine structure with low alkaline ion content, which is instrumental to reach low OER overpotential. The dual alkaline ion approach has been demonstrated for a single transition metal (Co) as well as different combinations of Co-Fe-Ni to form olivine solid solutions of the chemical formula Li(Na)Co(Fe,Ni)PO4. This screening of eight olivine materials revealed a trend in OER activity, and the Li0.6Na0.2Ni0.7Fe0.1PO4 solid solution displays an overpotential as low as 0.28 V versus RHE at 10 mA cm-2, with a low Tafel slope of 30 mV dec-1 and a stability tested over 20 h.

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Dual Alkaline Ion Route to Chemical De-insertion in Oxygen Evolution Olivine Electrocatalysts

Abstract

Bibliographical note

Funding

Keywords

UN SDGs

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