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Acidic Water Oxidation on Quantum Dots of IrO x /Graphdiyne
Author(s) -
Wang Zhongqiang,
Zheng Zhiqiang,
Xue Yurui,
He Feng,
Li Yuliang
Publication year - 2021
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.202101138
Subject(s) - tafel equation , oxygen evolution , overpotential , materials science , water splitting , anode , electrolysis , electrolysis of water , chemical engineering , quantum dot , hydrogen production , catalysis , electrocatalyst , electrode , cathode , nanotechnology , inorganic chemistry , electrochemistry , electrolyte , photocatalysis , chemistry , organic chemistry , engineering
Efficient acidic water oxidation utilization in the oxygen evolution reaction (OER) is still an important bottleneck for hydrogen production. From fundamental principles, a controllable graphdiyne (GDY) induced growth strategy is established; highly uniform size distribution of oxidized iridium quantum dots is prepared on the surface of graphdiyne (IrO x QD/GDY). The result shows that, the catalyst exhibits excellent activity and durability for acidic OER, with a current density of 10 mA cm −2 at a small overpotential of 236 mV versus the reversible hydrogen electrode (RHE) and a Tafel slope of 70 mV dec −1 . The performance is greatly superior to previously reported electrocatalysts. Remarkably, the acidic electrolyzer using IrO x QD/GDY as both cathode and anode electrodes can reach 10 mA cm −2 only at a much low cell voltage of 1.49 V (vs RHE). The results show the superior advantages of graphdiyne in effectively increasing numbers of the catalytically active sites for improving the charge transfer behavior and protecting the metal catalysts from corrosion.