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Zipping Up NiFe(OH)x-Encapsulated Hematite To Achieve an Ultralow Turn-On Potential for Water Oxidation AITranslate

Mingyang Li; Tianyu Liu; Yi Yang; Weitao Qiu; Chaolun Liang; Yexiang Tong; Yat Li;
University of California; University of California; University of California; Sun Yat-sen University; Sun Yat-sen University; Sun Yat-sen University; University of California
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Publisher: ACS
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Abstract AITranslate

The addition of oxygen evolution reaction (OER) catalysts improves photoelectrochemical (PEC) performance of photoanodes via facilitating charge transfer at the electrode/electrolyte interface and/or passivating surface hole-trap states. Yet, the poor interface and coating quality of the catalyst overlayer often plagues the performance enhancement due to the interference of hole/electron transport across the photoanode/catalyst interface. Here we address these challenges using a citrate-assisted method that allows conformal deposition of Ni–Fe hydroxide [NiFe(OH)x] overlayers on hematite nanowire photoanodes. These NiFe(OH)x overlayers significantly enhance the surface hole transfer kinetics and passivates the surface states. The NiFe(OH)x-encapsulated hematite nanowires exhibit an early turn-on potential of 0.53 V vs RHE. The findings highlight not only the importance of uniform OER catalyst coating but also the critical role of molecular linkers in boosting the performance of photoanodes.

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DOI：https://doi.org/10.1021/acsenergylett.9b01430

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Citation Information:

The addition of oxygen evolution reaction (OER) catalysts improves photoelectrochemical (PEC) performance of photoanodes via facilitating charge transfer at the electrode/electrolyte interface and/or passivating surface hole-trap states. Yet, the poor interface and coating quality of the catalyst overlayer often plagues the performance enhancement due to the interference of hole/electron transport across the photoanode/catalyst interface. Here we address these challenges using a citrate-assisted method that allows conformal deposition of Ni–Fe hydroxide [NiFe(OH)x] overlayers on hematite nanowire photoanodes. These NiFe(OH)x overlayers significantly enhance the surface hole transfer kinetics and passivates the surface states. The NiFe(OH)x-encapsulated hematite nanowires exhibit an early turn-on potential of 0.53 V vs RHE. The findings highlight not only the importance of uniform OER catalyst coating but also the critical role of molecular linkers in boosting the performance of photoanodes.

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GB/T 7714-2015 [1] Mingyang Li, Tianyu Liu, Yi Yang, et al. ACS Energy Letters, 2019(4). DOI:10.1021/acsenergylett.9b01430.
MLA [1] Mingyang Li, et al., ACS Energy Letters, no. 4, 2019, https://doi.org/10.1021/acsenergylett.9b01430.
APA [1] Mingyang Li, Tianyu Liu, Yi Yang, Weitao Qiu, Chaolun Liang, Yexiang Tong, & Yat Li. (2019). ACS Energy Letters(4). https://doi.org/10.1021/acsenergylett.9b01430
IEEE [1] Mingyang Li, Tianyu Liu, Yi Yang, Weitao Qiu, Chaolun Liang, Yexiang Tong, and Yat Li, ACS Energy Letters, no. 4, 2019, doi: 10.1021/acsenergylett.9b01430.