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Redirecting dynamic surface restructuring of a layered transition metal oxide catalyst for superior water oxidation
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Redirecting dynamic surface restructuring of a layered transition metal oxide catalyst for superior water oxidation
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Journal Article
Redirecting dynamic surface restructuring of a layered transition metal oxide catalyst for superior water oxidation
2021
Overview
Rationally manipulating the in situ formed catalytically active surface of catalysts remains a tremendous challenge for a highly efficient water electrolysis. Here we present a cationic redox-tuning method to modulate in situ catalyst leaching and to redirect the dynamic surface restructuring of layered LiCoO
2–
x
Cl
x
(
x
= 0, 0.1 or 0.2), for the electrochemical oxygen evolution reaction (OER). Chlorine doping lowered the potential to trigger in situ cobalt oxidation and lithium leaching, which induced the surface of LiCoO
1.8
Cl
0.2
to transform into a self-terminated amorphous (oxy)hydroxide phase during the OER. In contrast, Cl-free LiCoO
2
required higher electrochemical potentials to initiate the in situ surface reconstruction to spinel-type Li
1±
x
Co
2
O
4
and longer cycles to stabilize it. Surface-restructured LiCoO
1.8
Cl
0.2
outperformed many state-of-the-art OER catalysts and demonstrated remarkable stability. This work makes a stride in modulating surface restructuring and in designing superior OER electrocatalysts via manipulating the in situ catalyst leaching.
Rationally manipulating the in-situ-formed catalytically active surface of catalysts is a challenging but promising endeavour. Now, the surface of LiCoO
2
during water oxidation is engineered by Cl doping via a cationic redox-tuning method that modulates in situ leaching and redirects the dynamic surface restructuring.
Publisher
Nature Publishing Group UK,Nature Publishing Group
Subject
