Improving Stability and Photoelectrochemical Performance of BiVO4 Photoanodes in Basic Media by Adding a ZnFe2O4 Layer

The Journal of Physical Chemistry Letters
Tae Woo Kim, Kyoung-Shin Choi

Abstract

BiVO4 photoanodes have mainly been investigated under neutral conditions because BiVO4 gradually dissolves under extreme pH conditions. In this study, the possibility of utilizing ZnFe2O4 as a protection layer to stabilize BiVO4 in a 0.1 M KOH solution was investigated. A 10-15 nm thick ZnFe2O4 layer was conformally placed on a nanoporous BiVO4 electrode by photodepositing a FeOOH layer, followed by drop casting a zinc nitrate solution and annealing. The resulting BiVO4/ZnFe2O4 electrode generated a photocurrent density of >2 mA/cm(2) at 1.23 V versus RHE with a significantly improved stability compared with the pristine BiVO4 electrode. The incident and absorbed photon-to-current conversion efficiencies along with absorption spectra suggested that the ZnFe2O4 protection layer also contributes to photocurrent generation by increasing photon absorption and electron-hole separation. These results suggest that further investigation of protection and catalyst layers can enable more stable and efficient operation of BiVO4-based photoanodes in basic media.

References

Dec 7, 2006·Journal of the American Chemical Society·Andreas KayMichael Grätzel
Oct 25, 2012·Chemical Society Reviews·Yiseul ParkKyoung-Shin Choi
Dec 30, 2014·Journal of the American Chemical Society·Yong-Siou ChenPrashant V Kamat

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Citations

Jul 28, 2016·ACS Applied Materials & Interfaces·Bo-Yan ChengJih-Jen Wu
Aug 24, 2016·ACS Applied Materials & Interfaces·Aniketa ShindeJoel A Haber
Sep 7, 2016·Nature Communications·Micaela Crespo-QuesadaErwin Reisner
Feb 23, 2019·Advanced Materials·Jin Hyun Kim, Jae Sung Lee
Oct 5, 2018·Environmental Science and Pollution Research International·Eric da Cruz SeveroEdson Luiz Foletto
Mar 15, 2019·Chemical Communications : Chem Comm·Zeai HuangKazuhiro Sayama
Sep 1, 2017·Nature Communications·Tengfei LiCurtis P Berlinguette
Oct 29, 2019·The Journal of Physical Chemistry Letters·Francesco Ambrosio, Julia Wiktor
Mar 3, 2018·ACS Applied Materials & Interfaces·Francesco AmbrosioAlfredo Pasquarello
Dec 26, 2021·Nature Materials·Xianwen Mao, Peng Chen

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