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Nickel confined in 2D earth-abundant oxide layers for highly efficient and durable oxygen evolution catalysts

Nickel confined in 2D earth-abundant oxide layers for highly efficient and durable oxygen evolution catalysts
Nickel confined in 2D earth-abundant oxide layers for highly efficient and durable oxygen evolution catalysts
Low cost, high-efficiency catalysts towards water splitting are urgently required to fulfil the increasing demand for energy. In this work, low-loading (< 20 wt.%) Ni-confined in layered metal oxides anode catalysts (birnessite and lepidocrocite titanate) have been synthesized by facile ion exchange methodology and subjected to systematic electrochemical studies. It was found that Niintercalated on K-rich birnessite (Ni-KMO) presents an onset overpotential (ηonset) as low as 100 mV and overpotential at 10 mA cm-2 (η10) of 206 mV in pH=14 electrolyte. By combining electrochemical methods and X-ray absorption and emission spectroscopies (XAS and XES), we demonstrate Ni sites are the active sites for OER catalysis and that the Mn3+ sites facilitate Ni intercalation during the ionexchange process, but display no observable contribution towards OER activity. The effect of the pH and the nature of the supporting electrolyte on the electrochemical performance were also evaluated.
2050-7488
Pu, Yayun
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Lawrence, Matthew J.
76aef46e-f0d8-4af4-8fa0-0bf4219d8956
Celorrio, Veronica
5ebb7fb5-a74c-4872-9795-5830dc915d0b
Wang, Qi
6b05dc00-a6b6-42ef-85b5-3c525f4715d8
Gu, Meng
c07c298d-9dc9-43f9-907d-cdbe454ff934
Sun, Zongzhao
b05b2f0d-cfa2-4737-a0ce-f27c71681477
Agudo Jácome, Leonardo
b137d46c-0115-4d32-8950-c94d620ae74a
Russell, Andrea E.
b6b7c748-efc1-4d5d-8a7a-8e4b69396169
Huang, Limin
9e9bdb52-baa7-427a-9086-4fafbd9c785a
Rodriguez, Paramaconi
5a751a4e-490e-42bb-9c22-7b0fc72e9a09
Pu, Yayun
e0db849a-bc5e-4ff6-9dae-58d0759da4dc
Lawrence, Matthew J.
76aef46e-f0d8-4af4-8fa0-0bf4219d8956
Celorrio, Veronica
5ebb7fb5-a74c-4872-9795-5830dc915d0b
Wang, Qi
6b05dc00-a6b6-42ef-85b5-3c525f4715d8
Gu, Meng
c07c298d-9dc9-43f9-907d-cdbe454ff934
Sun, Zongzhao
b05b2f0d-cfa2-4737-a0ce-f27c71681477
Agudo Jácome, Leonardo
b137d46c-0115-4d32-8950-c94d620ae74a
Russell, Andrea E.
b6b7c748-efc1-4d5d-8a7a-8e4b69396169
Huang, Limin
9e9bdb52-baa7-427a-9086-4fafbd9c785a
Rodriguez, Paramaconi
5a751a4e-490e-42bb-9c22-7b0fc72e9a09

Pu, Yayun, Lawrence, Matthew J., Celorrio, Veronica, Wang, Qi, Gu, Meng, Sun, Zongzhao, Agudo Jácome, Leonardo, Russell, Andrea E., Huang, Limin and Rodriguez, Paramaconi (2020) Nickel confined in 2D earth-abundant oxide layers for highly efficient and durable oxygen evolution catalysts. Journal of Materials Chemistry A. (doi:10.1039/D0TA04031B).

Record type: Article

Abstract

Low cost, high-efficiency catalysts towards water splitting are urgently required to fulfil the increasing demand for energy. In this work, low-loading (< 20 wt.%) Ni-confined in layered metal oxides anode catalysts (birnessite and lepidocrocite titanate) have been synthesized by facile ion exchange methodology and subjected to systematic electrochemical studies. It was found that Niintercalated on K-rich birnessite (Ni-KMO) presents an onset overpotential (ηonset) as low as 100 mV and overpotential at 10 mA cm-2 (η10) of 206 mV in pH=14 electrolyte. By combining electrochemical methods and X-ray absorption and emission spectroscopies (XAS and XES), we demonstrate Ni sites are the active sites for OER catalysis and that the Mn3+ sites facilitate Ni intercalation during the ionexchange process, but display no observable contribution towards OER activity. The effect of the pH and the nature of the supporting electrolyte on the electrochemical performance were also evaluated.

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Accepted/In Press date: 20 June 2020
e-pub ahead of print date: 22 June 2020

Identifiers

Local EPrints ID: 442046
URI: http://eprints.soton.ac.uk/id/eprint/442046
ISSN: 2050-7488
PURE UUID: 0bcd3496-cb1d-41f9-b3f5-0ef9a90fe8f8
ORCID for Andrea E. Russell: ORCID iD orcid.org/0000-0002-8382-6443

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Date deposited: 06 Jul 2020 16:30
Last modified: 07 Oct 2020 01:41

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Contributors

Author: Yayun Pu
Author: Matthew J. Lawrence
Author: Veronica Celorrio
Author: Qi Wang
Author: Meng Gu
Author: Zongzhao Sun
Author: Leonardo Agudo Jácome
Author: Limin Huang
Author: Paramaconi Rodriguez

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