摘要
Efficient catalysts are required for both oxidative and reductive reactions of hydrogen and oxygen in sustainable energy conversion devices.However,current precious metal-based electrocatalysts do not perform well across the full range of reactions and reported multifunctional catalysts are all complex hybrids.Here,we show that singlephase porous Co3Mo3N prepared via a facile method is an efficient and reliable electrocatalyst for three essential energy conversion reactions;oxygen evolution reaction(OER),oxygen reduction reaction(ORR),and hydrogen evolution reaction(HER)in alkaline solutions.Co3-Mo3N presents outstanding OER,ORR,and HER activity with high durability,comparable with the commercial catalysts RuO2 for OER and Pt/C for ORR and HER.In practical demonstrations,Co3Mo3N gives high specific capacity(850 mA h gZn^(-1) at 10 mA cm^(-2))as the cathode in a zinc-air battery,and a low potential(1.63 V at 10 mA cm^(-2))used in a water-splitting electrolyzer.Availability of Co and Mo d-states appear to result in high ORR and HER performance,while the OER properties result from a cobalt oxide-rich activation surface layer.Our findings will inspire further development of bimetallic nitrides as cost-effective and versatile multifunctional catalysts that will enable scalable usage of electrochemical energy devices.
基金
This work was financially supported by the Natural Science Foundation of China(grant no.21471147)
the National Key Research and Development Plan(grant no.2016YFB0101205)
M.Y.acknowledges the National program for Thousand Youth Talents of China and Ningbo 3315 program for support.J.P.A.acknowledges EPSRC for sponsoring this research.J.W.thanks the Program of Shanghai Academic Research Leader(grant no.20XD1424300)
the National Natural Science Foundation of China(grant no.52072389)for financial support.T.T.also acknowledges DST of India for financial support for work on energy harnessing(via DSEHC),Core Research(Core Research Grant),IndoHungary solar work,and energy storage and conversion(via MES).
