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首页> 外文期刊>Acta Crystallographica, Section B. Structural science, crystal engineering and materials >Oxyanion induced variations in domain structure for amorphous cobalt oxide oxygen evolving catalysts, resolved by X-ray pair distribution function analysis
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Oxyanion induced variations in domain structure for amorphous cobalt oxide oxygen evolving catalysts, resolved by X-ray pair distribution function analysis

机译：X射线对分布函数分析解决了由氰化物引起的无定形氧化钴氧释放催化剂的畴结构变化

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Amorphous thin film oxygen evolving catalysts, OECs, of first-row transition metals show promise to serve as self-assembling photoanode materials in solardriven, photoelectrochemical 'artificial leaf' devices. This report demonstrates the ability to use high-energy X-ray scattering and atomic pair distribution function analysis, PDF, to resolve structure in amorphous metal oxide catalyst films. The analysis is applied here to resolve domain structure differences induced by oxyanion substitution during the electrochemical assembly of amorphous cobalt oxide catalyst films, Co-OEC. PDF patterns for Co-OEC films formed using phosphate, Pi, methylphosphate, MPi, and borate, Bi, electrolyte buffers show that the resulting domains vary in size following the sequence Pi < MPi < Bi. The increases in domain size for CoMPi and CoBi were found to be correlated with increases in the contributions from bilayer and trilayer stacked domains having structures intermediate between those of the LiCoOO and CoO(OH) mineral forms. The lattice structures and offset stacking of adjacent layers in the partially stacked CoMPi and CoBi domains were best matched to those in the LiCoOO layered structure. The results demonstrate the ability of PDF analysis to elucidate features of domain size, structure, defect content and mesoscale organization for amorphous metal oxide catalysts that are not readily accessed by other X-ray techniques. PDF structure analysis is shown to provide a way to characterize domain structures in different forms of amorphous oxide catalysts, and hence provide an opportunity to investigate correlations between domain structure and catalytic activity.
机译：第一行过渡金属的无定形薄膜氧气析出催化剂OEC有望在太阳能驱动的光电化学“人造叶”装置中用作自组装光阳极材料。该报告证明了使用高能X射线散射和原子对分布函数分析PDF解析非晶态金属氧化物催化剂膜中结构的能力。在此应用分析来解决在无定形氧化钴催化剂薄膜Co-OEC的电化学组装过程中由氧阴离子取代引起的畴结构差异。使用磷酸盐，Pi，磷酸甲基甲酯，MPi和硼酸盐，Bi电解质缓冲液形成的Co-OEC膜的PDF模式显示，所得结构域的大小按照以下顺序变化：Pi

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