电镀-高温氧化法制备CoCo_2O_4尖晶石型太阳能选择性吸收层  

CoCo_2O_4 spinel solar selective absorber coating prepared by plating combined with high-temperature oxidation

作　　者：赵桐[1,2] 李永堂[1,2] 杜诗文[1,2] 李晔珑 

机构地区：[1]太原科技大学材料科学与工程学院,山西太原030024 [2]金属材料成形理论与技术山西省重点实验室,山西太原030024

出　　处：《电镀与涂饰》2016年第12期601-604,共4页Electroplating & Finishing

摘　　要：先采用电镀法在铁素体不锈钢上制备纯钴镀层,配方和工艺为:CoSO_4·7H_2O 300 g/L,CoCl_2·6H_2O 50 g/L,H_3BO_4 30 g/L,十二烷基磺酸钠(SDS)0.03 g/L,p H 5.0,室温,电流密度20 m A/cm^2,极间距30 mm,时间20 min。再在800°C下对Co镀层高温热氧化4 h,得到尖晶石型CoCo_2O_4太阳能选择性吸收层。分别采用扫描电镜(SEM)和X射线衍射仪(XRD)对镀层的相结构和表面形貌进行表征。研究了Co镀层厚度(即电镀时间)对尖晶石型CoCo_2O_4吸收层光学性能的影响。结果表明,电镀时间为20 min时,最终所得CoCo_2O_4层的光学性能最佳,在700°C下工作的优选因数FOM为50.31 W/cm^2。将热氧化时间延长至100 h后,CoCo_2O_4吸收层的结构和光学性能均未发生明显变化,说明其高温稳定性优良。Pure cobalt coating was prepared on the surface of ferritic stainless steel by electroplating from a bath comprising 300 g/L CoSO4·7H2O, 50 g/L CoCl2·6H2O, 30 g/L H3BO4 and 0.03 g/L sodium dodecyl sulfate（SDS） under the conditions as follows： p H 5.0, room temperature, current density 20 m A/cm2, electrode distance 30 mm, and time 20 min. CoCo2O4 spinel solar selective absorber coating was obtained by high-temperature oxidation on the as-plated Co coating at 800 °C for 4 h. The phase structure and surface morphology of the coatings were characterized by scanning electron microscope（SEM） and X-ray diffractometer（XRD）, respectively. The influence of thickness of Co coating（i.e. plating time） on the optical performance of CoCo2O4 absorber coating was studied. It is shown that the CoCo2O4 coating transformed from Co coating obtained by electroplating for 20 min features the optimal optical performance, as shown by a FOM（figure of merit） of 50.31 W/cm2 when working at 700 °C. Neither of the structure and optical performance of CoCo2O4 absorber coating changes obviously even prolonging the oxidation time to 100 h, indicating that the CoCo2O4 coating has an excellent thermal stability.

关 键 词：铁素体不锈钢 电镀钴 高温氧化 尖晶石氧化物 太阳能选择性吸收 光学 

分 类 号：TQ153.2[化学工程—电化学工业]