F和Co共掺杂羟基磷灰石增强α-Fe2O3光阳极光电催化水氧化的性能研究（英文）

Fluorine and cobalt co-doping hydroxyapatite decorated hematite toward enhanced photoelectrochemical water oxidation

表面修饰产氧助催化剂是提高α-Fe2O3光电催化水氧化反应效率的重要手段.通过水热法在α-Fe2O3表面构筑F掺杂羟基磷灰石(F-HAP),并在此基础上通过离子交换法制备了F、Co共掺杂HAP表面修饰的α-Fe2O3光阳极(FCo-HAP/α-Fe2O3).采用X射线衍射、扫描电子显微镜、紫外可见吸收光谱、电化学阻抗谱等表征了FCo-HAP/α-Fe2O3结构、电化学性质和光电催化水氧化性能,并与F-HAP/α-Fe2O3和Co-HAP/α-Fe2O3等进行了对比.结果表明,F掺杂能降低α-Fe2O3表面HAP晶粒的尺寸,提高Co-HAP/α-Fe2O3的电化学活性面积,促进光生电荷向电解质转移,最终提高了α-Fe2O3表面的光电催化水氧化性能.

Surface modification with oxygen evolution cocatalyst is an important method to improve the photoelectrochemical (PEC) performance of α-Fe2O3. In this work, F doping hydroxyapatite (HAP) was first constructed on the surface of α-Fe2O3, and then F and Co co-doping HAP decorated α-Fe2O3 (FCo-HAP/α-Fe2O3) was fabricated by using ion-exchange process. The crystalline structure, surface morphology,(photo)electrochemical performance of FCo-HAP/α-Fe2O3 were characterized by using X-ray diffraction, scanning electron microscopy and (photo)electrochemical test, and compared with F-HAP/α-Fe2O3 and Co-HAP/α-Fe2O3. Results indicated that the doping with F could reduce the size of HAP on α-Fe2O3 surface followed by enlarge the electrochemically active surface area, and promote the charge transfer from photoanode to electrolyte, thus significantly improve the PEC water oxidation of α-Fe2O3.