High-Performance Electrochemical and Photoelectrochemical Water Splitting at Neutral pH by Ir Nanocluster-Anchored CoFe-Layered Double Hydroxide Nanosheets.
basic_science · Level V
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- Record sourced from PubMed, PMID 37212638.
- Also identified by DOI 10.1021/acs.nanolett.3c01024.
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Abstract
Highly efficient electrocatalysts for the oxygen evolution reaction (OER) in neutral electrolytes are indispensable for practical electrochemical and photoelectrochemical water splitting technologies. However, there is a lack of good, neutral OER electrocatalysts because of the poor stability when H<sup>+</sup> accumulates during the OER and slow OER kinetics at neutral pH. Herein, we report Ir species nanocluster-anchored, Co/Fe-layered double hydroxide (LDH) nanostructures in which the crystalline nature of LDH-restrained corrosion associated with H<sup>+</sup> and the Ir species dramatically enhanced the OEC kinetics at neutral pH. The optimized OER electrocatalyst demonstrated a low overpotential of 323 mV (at 10 mA cm<sup>-2</sup>) and a record low Tafel slope of 42.8 mV dec<sup>-1</sup>. When it was integrated with an organic semiconductor-based photoanode, we obtained a photocurrent density of 15.2 mA cm<sup>-2</sup> at 1.23 V versus reversible hydrogen in neutral electrolyte, which is the highest among all reported photoanodes to our knowledge.