TY - JOUR
T1 - Construction of hydroxide pn junction for water splitting electrocatalysis
AU - Zeng, Ye
AU - Cao, Zhen
AU - Liao, Jizhang
AU - Liang, Hanfeng
AU - Wei, Binbin
AU - Xu, Xun
AU - Xu, Haiwang
AU - Zheng, Jiaxian
AU - Zhu, Weijie
AU - Cavallo, Luigi
AU - Wang, Zhoucheng
N1 - KAUST Repository Item: Exported on 2021-04-06
Acknowledgements: This work was supported by the National Natural Science Foundation of China (No. 22075236, 22001081).
PY - 2021/3/19
Y1 - 2021/3/19
N2 - NiFe 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.
AB - NiFe 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.
UR - http://hdl.handle.net/10754/668524
UR - https://linkinghub.elsevier.com/retrieve/pii/S0926337321002861
UR - http://www.scopus.com/inward/record.url?scp=85103337837&partnerID=8YFLogxK
U2 - 10.1016/j.apcatb.2021.120160
DO - 10.1016/j.apcatb.2021.120160
M3 - Article
SN - 0926-3373
VL - 292
SP - 120160
JO - Applied Catalysis B: Environmental
JF - Applied Catalysis B: Environmental
ER -
