Hydroxyapatite(HAP) coatings were prepared on the titanium substrate in the electrolyte containing H2O2 by the pulse electrodeposition. The introduction of H2O2 restrains the evolution of H2 and improves the adhesive ...Hydroxyapatite(HAP) coatings were prepared on the titanium substrate in the electrolyte containing H2O2 by the pulse electrodeposition. The introduction of H2O2 restrains the evolution of H2 and improves the adhesive strength between coatings and substrate. The results of pulse electrodeposition show that the relaxation time of the pulse is beneficial to growth of HAP because it makes ions diffuse from bulk to the surface of electrode and reduces concentration polarization in the next pulse time. It is beneficial to the increase of the duty circle of the pulse for deposition of HAP, but the result is not good if it is increased excessively. With increasing potential, it is good for the growth of HAP coatings. If the potential is too high, it is easy for HAP coatings to drop off during the process of electrodeposition under too intensive polarization, such as -1.0 V (vs SCE), and there is not many coatings on the substrate. The combination of pulse electrodeposition and addition of hydrogen peroxide can assuredly improve the physico-chemical properties of hydroxyapatite coatings.展开更多
采用恒电位沉积法,在二元Sb-GO溶液体系中得到rGO-Sb预制层,在此过程中,GO被有效还原成rGO,并与Sb形成化学键。随后通过将预制层进行二段硒化热处理,快速去除多余的Se制备出rGO-Sb_(2)Se_(3)光阴极薄膜。通过XRD、SEM、Raman、XPS、UV-...采用恒电位沉积法,在二元Sb-GO溶液体系中得到rGO-Sb预制层,在此过程中,GO被有效还原成rGO,并与Sb形成化学键。随后通过将预制层进行二段硒化热处理,快速去除多余的Se制备出rGO-Sb_(2)Se_(3)光阴极薄膜。通过XRD、SEM、Raman、XPS、UV-vis及PEC等手段对薄膜样品进行表征以及光电化学性能测试。结果表明:负载rGO使得rGO-Sb_(2)Se_(3)在700 nm以内的可见光区域的光吸收系数显著提升。rGO优良的导电性能及较高的载流子迁移率,可以快速转移电荷,抑制载流子的复合,因此光电化学性能以及光稳定性大大提高,光电流密度增大至接近Sb_(2)Se_(3)单相的2倍(−0.20 mA/cm^(2))。又因为rGO-Sb_(2)Se_(3)导带位置(−0.74 V vs.RHE)远负于析氢电位(0 V vs.RHE),故可作为一种新型光还原产氢的阴极,具备广阔的应用前景。展开更多
基金Project(50104012) supported by the National Natural Science Foundation of China
文摘Hydroxyapatite(HAP) coatings were prepared on the titanium substrate in the electrolyte containing H2O2 by the pulse electrodeposition. The introduction of H2O2 restrains the evolution of H2 and improves the adhesive strength between coatings and substrate. The results of pulse electrodeposition show that the relaxation time of the pulse is beneficial to growth of HAP because it makes ions diffuse from bulk to the surface of electrode and reduces concentration polarization in the next pulse time. It is beneficial to the increase of the duty circle of the pulse for deposition of HAP, but the result is not good if it is increased excessively. With increasing potential, it is good for the growth of HAP coatings. If the potential is too high, it is easy for HAP coatings to drop off during the process of electrodeposition under too intensive polarization, such as -1.0 V (vs SCE), and there is not many coatings on the substrate. The combination of pulse electrodeposition and addition of hydrogen peroxide can assuredly improve the physico-chemical properties of hydroxyapatite coatings.
文摘采用恒电位沉积法,在二元Sb-GO溶液体系中得到rGO-Sb预制层,在此过程中,GO被有效还原成rGO,并与Sb形成化学键。随后通过将预制层进行二段硒化热处理,快速去除多余的Se制备出rGO-Sb_(2)Se_(3)光阴极薄膜。通过XRD、SEM、Raman、XPS、UV-vis及PEC等手段对薄膜样品进行表征以及光电化学性能测试。结果表明:负载rGO使得rGO-Sb_(2)Se_(3)在700 nm以内的可见光区域的光吸收系数显著提升。rGO优良的导电性能及较高的载流子迁移率,可以快速转移电荷,抑制载流子的复合,因此光电化学性能以及光稳定性大大提高,光电流密度增大至接近Sb_(2)Se_(3)单相的2倍(−0.20 mA/cm^(2))。又因为rGO-Sb_(2)Se_(3)导带位置(−0.74 V vs.RHE)远负于析氢电位(0 V vs.RHE),故可作为一种新型光还原产氢的阴极,具备广阔的应用前景。
