Construction of hydroxide pn junction for water splitting electrocatalysis
KAUST DepartmentKAUST Catalysis Center (KCC)
Physical Science and Engineering (PSE) Division
Chemical Science Program
Embargo End Date2023-03-24
Permanent link to this recordhttp://hdl.handle.net/10754/668524
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AbstractNiFe oxyhydroxide (NiFe−OH) has shown promising electrocatalytic oxygen evolution reaction (OER) activity. Here we suggest that the performance of NiFe−OH can be further enhanced by constructing pn junction. Using MnCo carbonate hydroxide (MnCo−CH)@NiFe−OH pn junction as a demonstration, we show that upon the construction of pn junction, the electrons flow from n-type NiFe−OH to MnCo−CH, which consequently generates a positively charged region on NiFe−OH. The density function theory calculation reveals that such an electronic property change results in an improved OER energetics. As a result, the MnCo−CH@NiFe−OH pn junction shows significantly enhanced OER performance that is ∼10 and ∼500 times that of NiFe−OH and MnCo−CH (in terms of the OER currents at the overpotential of 270 mV), respectively. Moreover, the pn junction also shows a greatly boosted hydrogen evolution reaction (HER) and therefore the overall water electrolysis activity that outperforms the Pt/C||RuO2 catalysts.
CitationZeng, Y., Cao, Z., Liao, J., Liang, H., Wei, B., Xu, X., … Wang, Z. (2021). Construction of hydroxide pn junction for water splitting electrocatalysis. Applied Catalysis B: Environmental, 292, 120160. doi:10.1016/j.apcatb.2021.120160
SponsorsThis work was supported by the National Natural Science Foundation of China (No. 22075236, 22001081).