Modulating Charge Transfer Efficiency of Hematite Photoanode with Hybrid Dual‐Metal–Organic Frameworks for Boosting Photoelectrochemical Water Oxidation

Wang, Keke; Liu, Yang; Kawashima, Kenta; Yang, Xuetao; Yin, Xiang; Zhan, Faqi; Liu, Min; Qiu, Xiaoqing; Li, Wenzhang; Mullins, Charles Buddie; Li, Jie

doi:10.1002/advs.202002563

Title: Modulating Charge Transfer Efficiency of Hematite Photoanode with Hybrid Dual‐Metal–Organic Frameworks for Boosting Photoelectrochemical Water Oxidation

Journal Article · Sun Oct 25 00:00:00 EDT 2020 · Advanced Science

DOI:https://doi.org/10.1002/advs.202002563· OSTI ID:1686232

Wang, Keke ^[1];

^[1];

^[2]; Yang, Xuetao ^[1]; Yin, Xiang ^[1]; Zhan, Faqi ^[1]; Liu, Min ^[3]; Qiu, Xiaoqing ^[1];

^[4];

^[2]; Li, Jie ^[1]

School of Chemistry and Chemical Engineering Central South University Changsha 410083 China
McKetta Department of Chemical Engineering and Department of Chemistry University of Texas at Austin Austin TX 78712‐0231 USA
Institute of Super‐Microstructure and Ultrafast Process in Advanced Materials School of Physics and Electronics Central South University Changsha 410083 China
School of Chemistry and Chemical Engineering Central South University Changsha 410083 China, Hunan Provincial Key Laboratory of Efficient and Clean Utilization of Manganese Resources Central South University Changsha 410083 China

Abstract The glorious charge transfer efficiency of photoanode is an important factor for efficient photoelectrochemical (PEC) water oxidation. However, it is often limited by slow kinetics of oxygen evolution reaction. Herein, a dual transition metal‐based metal–organic frameworks (MOF) cocatalyst, Fe@Ni–MOF, is introduced into a titanium‐doped hematite (Fe ₂ O ₃ :Ti) photoanode. The combination of Ni and Fe can optimize the filling of 3d orbitals. Moreover, the introduction of Fe donates electrons to Ni in the MOF structure, thus, suppressing the irreversible (long‐life‐time) oxidation of Ni ²⁺ into Ni ³⁺ . The resulting Fe@Ni–MOF/Fe ₂ O ₃ :Ti photoanode exhibits ∼threefold enhancement in the photocurrent density at 1.23 V versus the reversible hydrogen electrode. Kinetic analysis of the PEC water oxidation processes indicates that this performance improvement is primarily due to modulating the charge transfer efficiency of hematite photoanode. Further results show that a single transition metal‐based MOF cocatalyst, Ni–MOF, exhibits slow charge transfer in spite of a reduction in surface charge recombination, resulting in a smaller charge transfer efficiency. These findings provide new insights for the development of photoelectrodes decorated with MOFs.

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Research Organization:: Univ. of Texas, Austin, TX (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0002219

OSTI ID:: 1686232

Alternate ID(s):: OSTI ID: 1785858; OSTI ID: 1817102

Journal Information:: Advanced Science, Journal Name: Advanced Science Vol. 7 Journal Issue: 23; ISSN 2198-3844

Publisher:: Wiley Blackwell (John Wiley & Sons)Copyright Statement

Country of Publication:: Germany

Language:: English

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