Tuning electrochemically driven surface transformation in atomically flat LaNiO3 thin films for enhanced water electrolysis

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Tuning electrochemically driven surface transformation in atomically flat LaNiO3 thin films for enhanced water electrolysis

Baeumer, Christoph (author): Stanford Linear Accelerator Center (SLAC),Stanford University,RWTH Aachen University

Li, Jiang (author): Stanford Linear Accelerator Center (SLAC)

Lu, Qiyang (author): Advanced Light Source, Berkeley,Stanford Linear Accelerator Center (SLAC),Westlake University,Stanford University

Liang, Allen Yu Lun (author): Stanford University,Stanford Linear Accelerator Center (SLAC)

Jin, Lei (author): Jülich Research Centre

Martins, Henrique Perin (author): Advanced Light Source, Berkeley

Duchoň, Tomáš (author): Jülich Research Centre

Glöß, Maria (author): Leibniz Institute for Surface Modification,Jülich Research Centre

Gericke, Sabrina M. (author): Lund University,Lunds universitet,Förbränningsfysik,Fysiska institutionen,Institutioner vid LTH,Lunds Tekniska Högskola,Combustion Physics,Department of Physics,Departments at LTH,Faculty of Engineering, LTH,Lawrence Berkeley National Laboratory

Wohlgemuth, Marcus A. (author): Jülich Research Centre

Giesen, Margret (author): Jülich Research Centre

Penn, Emily E. (author): Stanford University

Dittmann, Regina (author): Jülich Research Centre

Gunkel, Felix (author): Jülich Research Centre

Waser, Rainer (author): RWTH Aachen University,Jülich Research Centre

Bajdich, Michal (author): Stanford Linear Accelerator Center (SLAC)

Nemšák, Slavomír (author): Advanced Light Source, Berkeley,Jülich Research Centre

Mefford, J. Tyler (author): Stanford University,Stanford Linear Accelerator Center (SLAC)

Chueh, William C. (author): Stanford University,Stanford Linear Accelerator Center (SLAC)

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(creator_code:org_t)

2021-01-11
2021
English 9 s.
In: Nature Materials. - : Springer Science and Business Media LLC. - 1476-1122 .- 1476-4660. ; 20:5, s. 674-682

Related links:: http://dx.doi.org/10...; show more...; https://www.osti.gov...; https://lup.lub.lu.s...; https://doi.org/10.1...; show less...

Journal article (peer-reviewed)

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Structure–activity relationships built on descriptors of bulk and bulk-terminated surfaces are the basis for the rational design of electrocatalysts. However, electrochemically driven surface transformations complicate the identification of such descriptors. Here we demonstrate how the as-prepared surface composition of (001)-terminated LaNiO3 epitaxial thin films dictates the surface transformation and the electrocatalytic activity for the oxygen evolution reaction. Specifically, the Ni termination (in the as-prepared state) is considerably more active than the La termination, with overpotential differences of up to 150 mV. A combined electrochemical, spectroscopic and density-functional theory investigation suggests that this activity trend originates from a thermodynamically stable, disordered NiO2 surface layer that forms during the operation of Ni-terminated surfaces, which is kinetically inaccessible when starting with a La termination. Our work thus demonstrates the tunability of surface transformation pathways by modifying a single atomic layer at the surface and that active surface phases only develop for select as-synthesized surface terminations.

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NATURAL SCIENCES: NATURAL SCIENCES; and Chemical Science ...

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By the university: Lund University

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Tuning electrochemically driven surface transformation in atomically flat LaNiO3 thin films for enhanced water electrolysis

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