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

DOI: 10.1039/D0TA04031B DOI Help

Authors: Yayun Pu (University of Birmingham; Southern University of Science and Technology) , Matthew J. Lawrence (University of Birmingham) , Veronica Celorrio (Diamond Light Source) , Qi Wang (Southern University of Science and Technology) , Meng Gu (Southern University of Science and Technology) , Zongzhao Sun (Southern University of Science and Technology) , Leonardo Agudo Jácome (Bundesanstalt für Materialforschung und-prüfung (BAM)) , Andrea E. Russell (University of Southampton) , Limin Huang (Southern University of Science and Technology) , Paramaconi Rodriguez (University of Birmingham)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Journal Of Materials Chemistry A , VOL 8 , PAGES 13340 - 13350

State: Published (Approved)
Published: July 2020
Diamond Proposal Number(s): 19850 , 21659

Open Access Open Access

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 oxide anode catalysts (birnessite and lepidocrocite titanate) have been synthesized by facile ion exchange methodology and subjected to systematic electrochemical studies. It was found that Ni-intercalated 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 ion-exchange 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 was also evaluated.

Subject Areas: Materials, Energy, Chemistry

Instruments: B18-Core EXAFS , I20-Scanning-X-ray spectroscopy (XAS/XES)