Pyo Eunji, Lee Keunyoung, Park Gi-Tae, Ha Se-Young, Lee Seonhong, Kim Chung Soo, Kwon Ki-Young
Department of Chemistry, Gyeongsang National University and Research Institute for Green Energy Convergence Technology Jinju 52828 South Korea
Analysis & Certification Center, Korea Institute of Ceramic Engineering & Technology Jinju 52851 South Korea.
RSC Adv. 2021 Aug 23;11(45):28342-28346. doi: 10.1039/d1ra05108c. eCollection 2021 Aug 16.
Amorphous cobalt-calcium phosphate composite (CCPC) films are electrochemically prepared on various electrodes by utilizing the solid phase of hydroxyapatite as a phosphate source. The CCPC film formation is surface process in which the dissolution of hydroxyapatite and the deposition of CCPC film concurrently occur on the electrode surface without the mass transfer of phosphate ions into the bulk solution. Elemental, crystallographic, and morphological analyses (EDX, ICP-AES, XPS, and XRD) indicate that the CCPC is composed of amorphous cobalt oxide with calcium and phosphate. The film exhibits durable oxygen evolution reaction (OER) catalytic properties under neutral and basic aqueous condition. Compared to using solution phase of phosphate source, our preparation method utilizing solid hydroxyapatite has advantage of preventing unnecessary chemical reaction between phosphate and other chemical species in bulk solution.
通过利用羟基磷灰石的固相作为磷源，在各种电极上电化学制备非晶态钴 - 磷酸钙复合材料（CCPC）薄膜。CCPC薄膜的形成是一个表面过程，其中羟基磷灰石的溶解和CCPC薄膜的沉积在电极表面同时发生，而磷酸根离子不会向本体溶液中进行传质。元素分析、晶体学分析和形态分析（能量散射X射线光谱法、电感耦合等离子体发射光谱法、X射线光电子能谱法和X射线衍射法）表明，CCPC由含有钙和磷的非晶态氧化钴组成。该薄膜在中性和碱性水溶液条件下表现出持久的析氧反应（OER）催化性能。与使用磷源的溶液相相比，我们利用固体羟基磷灰石的制备方法具有防止磷酸与本体溶液中其他化学物质之间发生不必要化学反应的优点。
