本文通过低温水解和Na_(2)CO_(3)活化制备了灵芝孢子粉基电容炭,并对其电化学性能进行了研究。研究结果表明,所制备的电容炭主要为微孔结构,孔径以0.8~0.9 nm为主。扫速为5 m V·s^(-1)时,由循环伏安(CV)测试得到该电容炭的比容量为...本文通过低温水解和Na_(2)CO_(3)活化制备了灵芝孢子粉基电容炭,并对其电化学性能进行了研究。研究结果表明,所制备的电容炭主要为微孔结构,孔径以0.8~0.9 nm为主。扫速为5 m V·s^(-1)时,由循环伏安(CV)测试得到该电容炭的比容量为135.9 F·g^(-1)。在恒流充放电(GCD)测试中,当电流密度由0.5 A·g^(-1)增至20 A·g^(-1),该电容炭的容量保持率为80.1%,表明该样品适合大电流充放电。该样品较小的阻抗和优异的循环稳定性表明该样品具有良好的电化学性能。展开更多
Novelthree-dimensionalstring and ball-like titanium dioxide/reduced graphene oxide, TiO_2/rGO(STG) composites were prepared using a one-step hydrolysis process followed by a low-temperature hydrothermaltreatment. The ...Novelthree-dimensionalstring and ball-like titanium dioxide/reduced graphene oxide, TiO_2/rGO(STG) composites were prepared using a one-step hydrolysis process followed by a low-temperature hydrothermaltreatment. The STG composites exhibited excellent photo-catalytic degradation performance for methylene blue owing to a good synergistic effect between TiO_2 and rGO. The STG composites with 1.0 wt% of rGO loading exhibited the highest removalrate of 86.0% for methylene blue and its reaction rate constant(5.27 × 10^(-3) min^(-1)) was much higher than those of pure string and ball-like TiO_2(ST). In addition, the STG composites also showed an outstanding capability for the photo-catalysis degradation of other cationic dyes. In addition, a possible photo-catalytic degradation mechanism for the STG composite was postulated, in which~?O_2^- and~·OH were the main oxidizing groups. This work of fers new insights into a better design and preparation of novelcomposite materials for the removalof organic dyes.展开更多
基金supported by the National High Technology Research and Development Program of China ("863" Program, No. 2012AA063504)the National Natural Science Foundation of China (Nos. 21276193, 215111300020, 201405008, and U1407116)the Natural Science Foundation of Tianjin, China (No. 13JCZDJC35600)
文摘Novelthree-dimensionalstring and ball-like titanium dioxide/reduced graphene oxide, TiO_2/rGO(STG) composites were prepared using a one-step hydrolysis process followed by a low-temperature hydrothermaltreatment. The STG composites exhibited excellent photo-catalytic degradation performance for methylene blue owing to a good synergistic effect between TiO_2 and rGO. The STG composites with 1.0 wt% of rGO loading exhibited the highest removalrate of 86.0% for methylene blue and its reaction rate constant(5.27 × 10^(-3) min^(-1)) was much higher than those of pure string and ball-like TiO_2(ST). In addition, the STG composites also showed an outstanding capability for the photo-catalysis degradation of other cationic dyes. In addition, a possible photo-catalytic degradation mechanism for the STG composite was postulated, in which~?O_2^- and~·OH were the main oxidizing groups. This work of fers new insights into a better design and preparation of novelcomposite materials for the removalof organic dyes.
