摘要
The fabrication of electrocatalysts with high activity and acid stability for acidic oxygen evolution reaction(OER)is an urgent need,yet extremely challenging.Here,we report the design and successful fabrication of a high performance self-supported cogwheel arrays-like nanoporous Ir_(x)Ru_(1−x)O_(2) catalyst with abundant atomic steps for acidic OER using a facile alloy-spinningelectrochemical activation method that allows large-scale fabrication.The obtained Ir_(x)Ru_(1−x)O_(2) catalysts merely need overpotentials of 211 and 295 mV to deliver catalytic current densities of 10 and 300 mA·cm^(−2) in 0.5 M H_(2)SO_(4),respectively,and can sustain constant OER electrolysis for at least 140 h at a high current density of 300 mA·cm^(−2).Further density functional theory(DFT)calculations uncover that such high intrinsic activities mainly originate from the largely exposed high-index atomic step planes,which markedly lower the limiting potential of the rate-determining step(RDS)of OER.These findings provide an insight into the exploration of high performance electrocatalysts,and open up an avenue for further developing the state-of-theart Ir and/or Ru-based catalysts for large-scale practical applications.
基金
supported by the S&T Partnership and International S&T Cooperation Program of Shanghai Cooperation Organization(No.2020E01040)
the High-level Talent Project of Xinjiang Uygur Autonomous Region(No.2020000039)
the National Key R&D Program of China(Nos.2018YFB0104400 and 2016YFB0100100)
the National Natural Science Foundation of China(Nos.62104073,21825202,92045302,21972055,and 21733012)
Newton Advanced Fellowships(No.NAF/R2/180603)
B.L.acknowledges the support by the National Natural Science Foundation of China(No.21573255).
