Facile room-temperature growth of nanostructured CuBi2O4 for selective electrochemical reforming and photoelectrochemical hydrogen evolution reactions
作者： Chia-Yu Lin , Shao-Yu Lin , Ming-Chun Tsai , Cheng-Hsien Wu
DOI: 10.1039/C9SE00558G
关键词: Faraday efficiency 、 Electrochemistry 、 Materials science 、 Electrode 、 Ultraviolet photoelectron spectroscopy 、 Substrate (chemistry) 、 Chemical bath deposition 、 Chemical reaction 、 Inorganic chemistry 、 Hydrogen production
摘要: Facile, room-temperature, and surfactant-free seed-mediated chemical bath deposition was developed to directly grow CuBi2O4 nanostructures on an electrode substrate for applications in electrochemical reforming of glucose photoelectrochemical (PEC) hydrogen generation. The metal precursor concentration Cu2+/Bi3+ molar ratio were found be decisive factors determining the structure CuBi2O4, single crystal submicron-square columns (microCuBi2O4), nano-square (nanoCuBi2O4), c-axis oriented (c-nanoCuBi2O4) selected detailed PEC characterization. results Tauc plots ultraviolet photoelectron spectroscopy (UPS) resolved band these compounds. Mott–Schottky UPS analyses showed that compounds had flat-band potentials >1.10 V vs. RHE, which makes them promising photocathodes synthesized exhibited different levels electrocatalytic activity towards electroreforming glucose, order nanoCuBi2O4 > c-nanoCuBi2O4 microCuBi2O4, is attributed structure-dependent kinetics reaction between electrochemically activated Cu species at elevated anodic potentials. Additionally, all samples high selectivity (faradaic efficiency 93%) formate generation from electro-oxidative conversion glucose. This study opens up a new avenue synthesis nanostructured with bi-functionality biomass reforming.
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