首页|Accelerated oxygen evolution kinetics on hematite by Zn2+ for boosting the photoelectrochemical water oxidation
Accelerated oxygen evolution kinetics on hematite by Zn2+ for boosting the photoelectrochemical water oxidation
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NSTL
Elsevier
? 2022 Elsevier B.V.The sluggish oxygen evolution reaction (OER) kinetics on hematite (α-Fe2O3) has constrained the photoelectrochemical (PEC) performance for water oxidation. Considering the regulatory effect of Zn for electrocatalytic OER, the Zn doped α-Fe2O3 nanowire is successfully prepared and served as the photoanode for PEC water oxidation. The results reveal the theoretical overpotential for the limiting step (from OH* to O*) is decreased by ca. 320 mV after Zn doing, which indicates an incredibly improved catalytic performance of OER. The Zn doped α-Fe2O3 displays PEC performance improvement over the bare α-Fe2O3, photocurrent density increases up to 0.88 mA/cm2(1.23 VRHE, 1 M NaOH), which shows a 44-fold increase than the α-Fe2O3. Meanwhile, the onset potential also shifts negatively by 300 mV, which also agrees well with the decreased OER overpotential. This work provides a deep understanding of the role of Zn in the α-Fe2O3 photoanodes and the strategy could be extended to other photoactive systems.
ConductivityOxygen evolution kineticsPhotoelectrochemical water oxidationZn dopingα-Fe2O3
Zhu H.、Mao K.、Xie Q.、Li S.、Li X.、Cai J.、Tang X.、Xu L.、Li H.
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School of Energy and Environment Anhui University of Technology
School of Metallurgic Engineering Anhui University of Technology
Key Lab for Anisotropy and Texture of Materials (MoE) School of Materials Science and Engineering Northeastern University
School of Physical Science and Technology Nanjing Normal University
NSTL
Elsevier
