Ternary NiCoFe layer hydroxides with different Ni/Co/Fe molar ratios were prepared using simple urea method.By finely tuning Ni/Co/Fe molar ratio,the optimized hydroxide(LDH(2.0)),a Ni/Co/Fe molar ratio of 2.0/1.0/1.0...Ternary NiCoFe layer hydroxides with different Ni/Co/Fe molar ratios were prepared using simple urea method.By finely tuning Ni/Co/Fe molar ratio,the optimized hydroxide(LDH(2.0)),a Ni/Co/Fe molar ratio of 2.0/1.0/1.0,provided high specific capacitance(408 F g^-1at 2.0 A g^-1)and good stability(90.9%retention over 1000 cycles)due to maximum crystallinity(91.35%crystallinity)and specific surface area(160 m^2g^-1).In order to further improve the electrochemical performances,the LDH(2.0)was made into a composite(LDH/PANI)with polyaniline(PANI)via in situ polymerization of aniline monomer.The LDH/PANI composite had a much higher specific capacitance(717 F g^-1at 2.0 A g^-1)compared with the LDH(2.0),and a significant improvement of cycleability(84.7%retention over 1000 cycles).The results indicated that the LDH/PANI had a synergistic effect of both components due to the complementary properties,which guaranteed a good electric contact and consequently increased the specific capacitance.These provided a new approach for designing organic-inorganic composite materials with potential application in supercapacitors.展开更多
A facile strategy was proposed to fabricate the S-doped flower-like BiOI microspheres(S-BiOI) for boosting the photocatalytic performance of BiOI via engineering the surface oxygen vacancy and exposed {001}crystal pla...A facile strategy was proposed to fabricate the S-doped flower-like BiOI microspheres(S-BiOI) for boosting the photocatalytic performance of BiOI via engineering the surface oxygen vacancy and exposed {001}crystal planes.The S-doping generated oxygen vacancies in BiOI lattice structure to create point defects and exposed {001} crystal planes,resulting in a decrease in bandgap and an enhancement in charges separation,which could significantly hasten the photocatalytic reaction.The concentration of CH_(4) N_(2) S was a key factor to promote the Cr(Ⅵ) reduction activities.The optimized S-BiOI_(1.25) presented a superior Cr(Ⅵ) removal efficiency of 100% for 60 min,which Cr(Ⅵ) reduction rate was 11.3 times higher than the pristine BiOI and still remained 97.5% Cr(Ⅵ) removal after 5 cycles.DFT calculation confirmed that the bandgap of the S-BiOI was narrowed compared to that of BiOI,but the S-BiOI still remained the intrinsic band structure of the pristine BiOI.展开更多
基金supported financially by the Joint Research Program of Hunan Provincial Natural Science Foundation (Xiangtan) of China (No. 2016JJ5030)the Hunan 2011 Collaborative Innovation Center of Chemical Engineering & Technology with Environmental Benignitythe PhD Startup Foundation of Xiangtan University (No. 17QDZ05)
文摘Ternary NiCoFe layer hydroxides with different Ni/Co/Fe molar ratios were prepared using simple urea method.By finely tuning Ni/Co/Fe molar ratio,the optimized hydroxide(LDH(2.0)),a Ni/Co/Fe molar ratio of 2.0/1.0/1.0,provided high specific capacitance(408 F g^-1at 2.0 A g^-1)and good stability(90.9%retention over 1000 cycles)due to maximum crystallinity(91.35%crystallinity)and specific surface area(160 m^2g^-1).In order to further improve the electrochemical performances,the LDH(2.0)was made into a composite(LDH/PANI)with polyaniline(PANI)via in situ polymerization of aniline monomer.The LDH/PANI composite had a much higher specific capacitance(717 F g^-1at 2.0 A g^-1)compared with the LDH(2.0),and a significant improvement of cycleability(84.7%retention over 1000 cycles).The results indicated that the LDH/PANI had a synergistic effect of both components due to the complementary properties,which guaranteed a good electric contact and consequently increased the specific capacitance.These provided a new approach for designing organic-inorganic composite materials with potential application in supercapacitors.
基金supported by Hunan Provincial Innovation Foundation For Postgraduate (No. XDCX2022Y096)Scientific Research Fund of Hunan Provincial Education Department(Nos. 20A480, 20B568)+2 种基金Natural Science Foundation of Hunan Province (Nos. 2020JJ4575 and 2019JJ50613)National Natural Science Foundation of China (Nos. 12002295 and 11832016)Natural Science Foundation of Hunan Province (No. 2019JJ50599)。
文摘A facile strategy was proposed to fabricate the S-doped flower-like BiOI microspheres(S-BiOI) for boosting the photocatalytic performance of BiOI via engineering the surface oxygen vacancy and exposed {001}crystal planes.The S-doping generated oxygen vacancies in BiOI lattice structure to create point defects and exposed {001} crystal planes,resulting in a decrease in bandgap and an enhancement in charges separation,which could significantly hasten the photocatalytic reaction.The concentration of CH_(4) N_(2) S was a key factor to promote the Cr(Ⅵ) reduction activities.The optimized S-BiOI_(1.25) presented a superior Cr(Ⅵ) removal efficiency of 100% for 60 min,which Cr(Ⅵ) reduction rate was 11.3 times higher than the pristine BiOI and still remained 97.5% Cr(Ⅵ) removal after 5 cycles.DFT calculation confirmed that the bandgap of the S-BiOI was narrowed compared to that of BiOI,but the S-BiOI still remained the intrinsic band structure of the pristine BiOI.
