Dual-atom catalysts have recently been recognized as promising alternatives to natural metalloenzymes.Inspired by the complex polymetallic active ce nters of natural metalloenzymes,we demonstrate the feasibility of th...Dual-atom catalysts have recently been recognized as promising alternatives to natural metalloenzymes.Inspired by the complex polymetallic active ce nters of natural metalloenzymes,we demonstrate the feasibility of the nitrogen-bridge d diatomic iron catalysts(Fe_(2)-N_(6)-C)as highly efficient dual-e nzyme mimics.It is noted that the as-prepared Fe_(2)-N_(6)-C catalysts show much higher activity than the single-atom iron catalysts(Fe_(1)-N_(4)-C).Experimental characterizations and theoretical simulations reveal that the N-bridged FeFe sites with an appropriate distance exert a synergy to enable more optimal intermediates adsorption and desorption,thus realizing enhanced dual-enzymatic performance.Taking advantage of the intrinsic dual-enzyme mimic activity of Fe_(2)-N_(6)-C catalysts,an innovative two-channel visual sensor array is constructed to distinguish and detect five common antioxidants.The sensor array can successfully identify 20 blind samples with a success rate of 100%.Moreover,a portable smartphone-based visual sensor assay is proposed,which could achieve on-site detection and differentiation of antioxidants based on their distinct color change.The present study illustrates the great potential of dual-atom catalyst-based sensor arrays as a promising visual platform for sensing applications.展开更多
基金supported by the National Natural Science Foundation of China(22172063)the Independent Cultivation Program of Innovation Team of Ji’nan City(2021GXRC052)the Young Taishan Scholar Program(tsqn201812080)。
文摘Dual-atom catalysts have recently been recognized as promising alternatives to natural metalloenzymes.Inspired by the complex polymetallic active ce nters of natural metalloenzymes,we demonstrate the feasibility of the nitrogen-bridge d diatomic iron catalysts(Fe_(2)-N_(6)-C)as highly efficient dual-e nzyme mimics.It is noted that the as-prepared Fe_(2)-N_(6)-C catalysts show much higher activity than the single-atom iron catalysts(Fe_(1)-N_(4)-C).Experimental characterizations and theoretical simulations reveal that the N-bridged FeFe sites with an appropriate distance exert a synergy to enable more optimal intermediates adsorption and desorption,thus realizing enhanced dual-enzymatic performance.Taking advantage of the intrinsic dual-enzyme mimic activity of Fe_(2)-N_(6)-C catalysts,an innovative two-channel visual sensor array is constructed to distinguish and detect five common antioxidants.The sensor array can successfully identify 20 blind samples with a success rate of 100%.Moreover,a portable smartphone-based visual sensor assay is proposed,which could achieve on-site detection and differentiation of antioxidants based on their distinct color change.The present study illustrates the great potential of dual-atom catalyst-based sensor arrays as a promising visual platform for sensing applications.
