Binary-dopant promoted lattice oxygen participation in OER on cobaltate electrocatalyst

Lina Tang; Tingting Fan; Zhou Chen; Jianling Tian; Hongquan Guo; Meilan Peng; Fan Zuo; Xianzhu Fu; Meng Li; Yunfei Bu; Yang Luo; Jianhui Li; Yifei Sun

doi:10.1016/j.cej.2021.129324

Binary-dopant promoted lattice oxygen participation in OER on cobaltate electrocatalyst

Lina Tang, Tingting Fan, Zhou Chen, Jianling Tian, Hongquan Guo, Meilan Peng, Fan Zuo, Xianzhu Fu, Meng Li, Yunfei Bu, Yang Luo, Jianhui Li, Yifei Sun

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

97 Scopus citations

Abstract

Lattice oxygen-mediated mechanism (LOM) on perovskite oxides for oxygen evolution reaction (OER) process has revealed kinetic superiority over conventional adsorbate evolution mechanism (AEM). However, feasibly enhancing the participation of lattice oxygen is still challenging. Here we designed a perovskite cobaltate (La_0.6Sr_0.4Co_0.8Fe_0.1Mn_0.1O_3-δ, LSCFM) nanofiber, and discovered that the co-incorporation of Fe/Mn elements significantly intensifies the involvement of lattice oxygen for OER. Compared with its mono-dopant (Fe or Mn only) counterparts, the LSCFM gives rise to higher surface oxygen vacancies (V_o) concentration and faster oxygen ion diffusion coefficient, endowing a small overpotential of 343 mV at 10 mA cm⁻² and low Tafel slope of 63 mV dec⁻¹. The strongest pH-dependent activity and metal–oxygen covalency are further unveiled on LSCFM by experimental and theoretical approaches, evidencing that the promoted OER kinetics on LSCFM predominantly stems from the formation of reactive lattice oxygen site.

Original language	English
Article number	129324
Journal	Chemical engineering journal
Volume	417
Early online date	Mar 13 2021
DOIs	https://doi.org/10.1016/j.cej.2021.129324
State	Published - Aug 1 2021
Externally published	Yes

Keywords

DFT
High entropy
Lattice oxygen mechanism
Oxygen evolution
Perovskite oxide

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title = "Binary-dopant promoted lattice oxygen participation in OER on cobaltate electrocatalyst",

abstract = "Lattice oxygen-mediated mechanism (LOM) on perovskite oxides for oxygen evolution reaction (OER) process has revealed kinetic superiority over conventional adsorbate evolution mechanism (AEM). However, feasibly enhancing the participation of lattice oxygen is still challenging. Here we designed a perovskite cobaltate (La0.6Sr0.4Co0.8Fe0.1Mn0.1O3-δ, LSCFM) nanofiber, and discovered that the co-incorporation of Fe/Mn elements significantly intensifies the involvement of lattice oxygen for OER. Compared with its mono-dopant (Fe or Mn only) counterparts, the LSCFM gives rise to higher surface oxygen vacancies (Vo) concentration and faster oxygen ion diffusion coefficient, endowing a small overpotential of 343 mV at 10 mA cm−2 and low Tafel slope of 63 mV dec−1. The strongest pH-dependent activity and metal–oxygen covalency are further unveiled on LSCFM by experimental and theoretical approaches, evidencing that the promoted OER kinetics on LSCFM predominantly stems from the formation of reactive lattice oxygen site.",

keywords = "DFT, High entropy, Lattice oxygen mechanism, Oxygen evolution, Perovskite oxide",

author = "Lina Tang and Tingting Fan and Zhou Chen and Jianling Tian and Hongquan Guo and Meilan Peng and Fan Zuo and Xianzhu Fu and Meng Li and Yunfei Bu and Yang Luo and Jianhui Li and Yifei Sun",

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year = "2021",

month = aug,

day = "1",

doi = "10.1016/j.cej.2021.129324",

language = "English",

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TY - JOUR

T1 - Binary-dopant promoted lattice oxygen participation in OER on cobaltate electrocatalyst

AU - Tang, Lina

AU - Fan, Tingting

AU - Chen, Zhou

AU - Tian, Jianling

AU - Guo, Hongquan

AU - Peng, Meilan

AU - Zuo, Fan

AU - Fu, Xianzhu

AU - Li, Meng

AU - Bu, Yunfei

AU - Luo, Yang

AU - Li, Jianhui

AU - Sun, Yifei

PY - 2021/8/1

Y1 - 2021/8/1

N2 - Lattice oxygen-mediated mechanism (LOM) on perovskite oxides for oxygen evolution reaction (OER) process has revealed kinetic superiority over conventional adsorbate evolution mechanism (AEM). However, feasibly enhancing the participation of lattice oxygen is still challenging. Here we designed a perovskite cobaltate (La0.6Sr0.4Co0.8Fe0.1Mn0.1O3-δ, LSCFM) nanofiber, and discovered that the co-incorporation of Fe/Mn elements significantly intensifies the involvement of lattice oxygen for OER. Compared with its mono-dopant (Fe or Mn only) counterparts, the LSCFM gives rise to higher surface oxygen vacancies (Vo) concentration and faster oxygen ion diffusion coefficient, endowing a small overpotential of 343 mV at 10 mA cm−2 and low Tafel slope of 63 mV dec−1. The strongest pH-dependent activity and metal–oxygen covalency are further unveiled on LSCFM by experimental and theoretical approaches, evidencing that the promoted OER kinetics on LSCFM predominantly stems from the formation of reactive lattice oxygen site.

AB - Lattice oxygen-mediated mechanism (LOM) on perovskite oxides for oxygen evolution reaction (OER) process has revealed kinetic superiority over conventional adsorbate evolution mechanism (AEM). However, feasibly enhancing the participation of lattice oxygen is still challenging. Here we designed a perovskite cobaltate (La0.6Sr0.4Co0.8Fe0.1Mn0.1O3-δ, LSCFM) nanofiber, and discovered that the co-incorporation of Fe/Mn elements significantly intensifies the involvement of lattice oxygen for OER. Compared with its mono-dopant (Fe or Mn only) counterparts, the LSCFM gives rise to higher surface oxygen vacancies (Vo) concentration and faster oxygen ion diffusion coefficient, endowing a small overpotential of 343 mV at 10 mA cm−2 and low Tafel slope of 63 mV dec−1. The strongest pH-dependent activity and metal–oxygen covalency are further unveiled on LSCFM by experimental and theoretical approaches, evidencing that the promoted OER kinetics on LSCFM predominantly stems from the formation of reactive lattice oxygen site.

KW - DFT

KW - High entropy

KW - Lattice oxygen mechanism

KW - Oxygen evolution

KW - Perovskite oxide

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DO - 10.1016/j.cej.2021.129324

M3 - Article

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VL - 417

JO - Chemical engineering journal

JF - Chemical engineering journal

M1 - 129324

ER -

Binary-dopant promoted lattice oxygen participation in OER on cobaltate electrocatalyst

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