Ho^3＋-doped titanium dioxide（TiO2：Ho^3＋） downconversion（DC） nanowires were synthesized through a simple hydrothermal method followed by a subsequent calcination process after being immersed in Ho（NO3）3 aqueous solution. Moreover, TiO2：Ho^3＋ nanowires（HTNWs） were used as the photoanode in dye-sensitized solar cells（DSSCs） to investigate their photoelectric properties. Scanning electron microscopy（SEM） and X-ray diffraction（XRD） were used to characterize the morphology and structure of the material, respectively. The photofluorescence and ultraviolet-visible absorption spectra of HTNWs reveal a DC from the near and middle ultraviolet light to visible light which matches the strong absorbed region of the N719 dye. Compared with the pure TNW photoanode, HTNWs DC photoanodes show greater photovoltaic efficiency. The photovoltaic conversion efficiency（η） of the DSSCs with HTNWs photoanode doped with 4% Ho2O3（mass fraction） is two times that with pure TNW photoanode. This enhancement could be attributed to HTNWs which could extend the spectral response range of DSSCs to the near and middle ultraviolet region and increase the short-circuit current density（Jsc） of DSSCs, thus leading to the enhancement of photovoltaic conversion efficiency.
为阐明海蜇伞部酶促溶性胶原蛋白(pepsin-solubilized collagen,PSC)的热变性反应机理,以保持完整三螺旋结构的PSC为研究对象,通过微量热仪测定不同升温速率条件下PSC的变性温度,以及采用34、35、36、37、38、39℃加热不同时间后的PSC残存率,并进行热变性动力学分析。结果表明,海蜇伞部PSC对热变化敏感,随着加热温度升高,单位时间内提高的热量增加,使海蜇伞部PSC变性速率加快,完成变性时间缩短;随着升温速率的减慢,吸热峰逐渐向低温区移动,即变性温度随升温速率的减慢而降低,但升温速率的变化对反应热并无显著影响。反应级数为0.9的回归方程能够较好地描述PSC热变性过程,在恒温34、35、36、37、38℃及39℃的条件下,PSC变性的D90值(90%蛋白变性所需时间)分别为53.76、26.11、15.75、4.89、4.26、2.55 min,Z90值(D值降低90%的温度变化)为3.69℃,表观活化能为481.90 k J/mol。研究结果可为海蜇胶原蛋白的进一步开发利用提供理论参考。
