Journal
NANOSCALE
Volume 13, Issue 33, Pages 14197-14206Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d1nr03257g
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Funding
- Foundation of State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering [2021-K57]
- Natural Science Foundation of Gansu [20JR5RA214, 20JR5RA220]
- Key Laboratory of Catalytic Engineering of Gansu Province and Resources Utilization, Gansu Province
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In this study, an ultrathin citrate-Ni0.9Co0.1(OH)(x) overlayer was conformally coated on the fluorine-doped hematite photoanode to promote internal hole extraction and surface hole injection, resulting in a superior photocurrent density. The synergistic effect between Ni and Co contributes to a rapid and continuous hole migration pathway for water oxidation.
Surface modification by loading a water oxidation co-catalyst (WOC) is generally considered an efficient means to optimize the sluggish surface oxygen evolution reaction (OER) of a hematite photoanode for photoelectrochemical (PEC) water oxidation. However, the surface WOC usually exerts little impact on the bulk charge separation of hematite. Herein, an ultrathin citrate-Ni0.9Co0.1(OH)(x) [Cit-Ni0.9Co0.1(OH)(x)] is conformally coated on the fluorine-doped hematite (F-Fe2O3) photoanode for PEC water oxidation to simultaneously promote the internal hole extraction and surface hole injection of the target photoanode. Besides, the conformally coated Cit-Ni0.9Co0.1(OH)(x) overlayer passivates the redundant surface trap states of F-Fe2O3. These factors result in a superior photocurrent density of 2.52 mA cm(-2) at 1.23 V versus a reversible hydrogen electrode (V vs. RHE) for the target photoanode. Detailed investigation manifests that the hole extraction property in Cit-Ni0.9Co0.1(OH)(x) is mainly derived from the Ni sites, while Co incorporation endows the overlayer with more catalytic active sites. This synergistic effect between Ni and Co contributes to a rapid and continuous hole migration pathway from the bulk to the interface of the target photoanode, and then to the electrolyte for water oxidation.
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