摘要
Seeking for extremely active and durable bifunctional electrocatalysts towards the overall water splitting possesses a strategic significance on the development of sustainable and clean energy for the replacement of fossil fuels.Ir-based nanomaterials are deemed as one of the most highefficiency oxygen evolution reaction electrocatalysts while the hydrogen evolution reaction performance is unfavorable.In this work,we report a one-pot hydrothermal synthesis of N-doped graphene anchored Ir nanoparticles(Ir/N-rGO) with ultrasmall particle size(~2.0 nm).Apart from the predictably superior OER performance,the resultant Ir/N-rGO also displays excellent hydrogen evolution reaction(HER) performance,requiring merely 76 and 260 mV overpotentials to achieve the current density of 10 mA cm^(-2) towards HER and OER,respectively.When applied as the bifunctional electrodes for overall water splitting,Ir/N-rGO needs a lower overpotential(1.74 V) to achieve a current density of50 mA cm^(-2) in alkaline solution,exceeding that of Pt/C and RuO_(2) couple(1.85 V).Thus,the as-fabricated Ir/N-rGO has a commendable prospect in the practical application of alkaline water electrocatalysis.
基金
financially supported by the National Natural Science Foundation of China (21875112)
the Natural Science Foundation of Jiangsu Province (BK20171473)
support from the National and Local Joint Engineering Research Center of Biomedical Functional Materials
a project sponsored by the Priority Academic Program Development of Jiangsu Higher Education Institutions。
