Effects of Anions and pH on the Stability of ZnO Nanorods
for Photoelectrochemical Water Splitting
Posted on 2018-03-23 - 09:03
This
work demonstrates the improved stability of zinc oxide nanorods
(ZnO NRs) for the photoanode of solar water splitting under voltage
biases by the addition of borate or carbonate ions in the aqueous
electrolyte with suitable pH ranges. The ZnO NRs prepared by the hydrothermal
method are highly active and stable at pH 10.5 in both borate and
carbonate buffer solutions, where a photocurrent higher than 99% of
the initial value has been preserved after 1 h polarization at 1.5
V (vs reversible hydrogen electrode) under AM 1.5G. The optimal pH
ranges with a minimum morphological change of ZnO NRs for photoelectrochemical
(PEC) water splitting in borate and carbonate buffer solutions are
9–13 and 10–12, respectively. The working pH range for
PEC water splitting on ZnO NR photoanodes can be extended to 8.5–12.5
by the combination of borate and carbonate anions. The lifetime of
ZnO NR photoanodes can be synergistically prolonged for over an order
of magnitude when the electrolyte is the binary electrolyte consisting
of borate and carbonate in comparison with these two anions used individually.
On the basis of the experimental results, a possible mechanism for
the protective behavior of ZnO in borate and carbonate solutions is
proposed. These findings can be used to improve the lifetime of other
high-performance ZnO-based catalysts and to understand the photocorrosive
and protective behaviors of ZnO NRs in the borate and carbonate solutions.
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Liu, Ching-Fang; Lu, Yi-Jing; Hu, Chi-Chang (2018). Effects of Anions and pH on the Stability of ZnO Nanorods
for Photoelectrochemical Water Splitting. ACS Publications. Collection. https://doi.org/10.1021/acsomega.8b00214
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AUTHORS (3)
CL
Ching-Fang Liu
YL
Yi-Jing Lu
CH
Chi-Chang Hu