In the present investigation,we examined the water and oxygen reduction ability of ZnCr-layered double hydroxide decorated with Au nanoparticles and reduced graphene oxide,prepared via in situ crystallization and phot...In the present investigation,we examined the water and oxygen reduction ability of ZnCr-layered double hydroxide decorated with Au nanoparticles and reduced graphene oxide,prepared via in situ crystallization and photoreduction method.The fabricated Au@LDH/RGO composite was well characterized by different analytical instruments like PXRD,FTIR,Raman,XPS,EDX,FESEM,and TEM,suggesting strong interaction between the components of the ternary hybrid.Further,the Au@LDH/RGO catalyst shows the best hydrogen evolution reaction(HER),i.e.,918.76μmol/2 h(no.evolved H_(2)gas is 4.9903×10^(15)cm^(−2)s^(−1))with an ACE of 10.5%and excellent reusability up to 8 h with little change in activity.Additionally,the ternary nanohybrid depicts robust photocatalytic O_(2)reduction reaction performance,i.e.,24.3μmol/2 h of H_(2)O_(2)(SCC=0.23%),which goes via a superoxide radical mechanism as confirmed through tracing experiments.The observed high photocatalytic activity is attributed to the synergetic effect of both plasmonic Au nanoparticles and conjugatedΠ-skeleton of RGO,which resulted in high charge carrier density and reduction of the recombination process.This observation is well justified by Mott-Schottky,EIS,PL,and photocurrent measurements.Further,the HER performance was also tested under different hole scavengers to figure out their effect.The SPR effect of Au and conjugated cyclic carbon network of RGO plays a pivotal part in improving the H_(2)and H_(2)O_(2)generation ability of LDH under visible light illumination.展开更多
文摘In the present investigation,we examined the water and oxygen reduction ability of ZnCr-layered double hydroxide decorated with Au nanoparticles and reduced graphene oxide,prepared via in situ crystallization and photoreduction method.The fabricated Au@LDH/RGO composite was well characterized by different analytical instruments like PXRD,FTIR,Raman,XPS,EDX,FESEM,and TEM,suggesting strong interaction between the components of the ternary hybrid.Further,the Au@LDH/RGO catalyst shows the best hydrogen evolution reaction(HER),i.e.,918.76μmol/2 h(no.evolved H_(2)gas is 4.9903×10^(15)cm^(−2)s^(−1))with an ACE of 10.5%and excellent reusability up to 8 h with little change in activity.Additionally,the ternary nanohybrid depicts robust photocatalytic O_(2)reduction reaction performance,i.e.,24.3μmol/2 h of H_(2)O_(2)(SCC=0.23%),which goes via a superoxide radical mechanism as confirmed through tracing experiments.The observed high photocatalytic activity is attributed to the synergetic effect of both plasmonic Au nanoparticles and conjugatedΠ-skeleton of RGO,which resulted in high charge carrier density and reduction of the recombination process.This observation is well justified by Mott-Schottky,EIS,PL,and photocurrent measurements.Further,the HER performance was also tested under different hole scavengers to figure out their effect.The SPR effect of Au and conjugated cyclic carbon network of RGO plays a pivotal part in improving the H_(2)and H_(2)O_(2)generation ability of LDH under visible light illumination.
