Journal
MATERIALS TODAY PHYSICS
Volume 28, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.mtphys.2022.100854
Keywords
CoP; TiO 2 nanoarray; p -n heterojunction; Electrocatalyst; NO 3; reduction reaction; NH 3 electrosynthesis
Funding
- National Natural Science Foundation of China [22072015, 21876117, U1833202]
- Open Research Fund of School of Chemistry and Chemical Engineering, Henan Normal University [2021YB05]
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The NO3RR activity of CoP is effectively enhanced by constructing a p-n heterojunction of CoP/TiO2 nanoarray on a titanium plate. This heterojunction establishes an electric field, accelerating electron transport and leading to an excellent Faradaic efficiency of 95.0% and a high NH3 yield of 499.8 μmol/h/cm2.
Electrochemical nitrate reduction reaction (NO3RR) affords a promising approach for maintaining the balance of the global nitrogen cycle while realizing a sustainable route of ambient ammonia synthesis. Herein, it is evidenced that the electrocatalytic NO3RR activity of CoP can be effectively enhanced by constructing a p-n heterojunction of CoP/TiO2 nanoarray on titanium plate (CoP/TiO2@TP). The p-n heterojunction formed in CoP/ TiO2 can establish a built-in electric field due to the difference in their Fermi levels, further accelerating the electrons transport. Benefiting from the interactions of heterostructure, such CoP/TiO2@TP attains an excellent Faradaic efficiency of 95.0% and a large NH3 yield as high as 499.8 mu mol h-1 cm-2, which is superior to CoP@TP and TiO2@TP. Moreover, theoretical calculations further reveal that the p-n heterostructure can induce charge redistribution of CoP and TiO2, and optimize the adsorptive free energy of intermediates.
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