0428同步年報-2021-全

018 ACTIVITY REPORT 2021 In−O and In−Se signals varied from 1.91 eV ( V G = 0 V) to 1.45 eV ( V G = 50 V). This decrease in the relative energy difference under the application of a 50-V V G indicates that compared with V G 0 V, photoemitted electrons from oxidation sites are accelerated by the external electric field, resulting in a red shift of the binding energy. Note that, during the measurements, the InSe channel was grounded to an energy analyzer, and if there were no charge accumulation on the sample surface, there would be no potential difference between the energy analyzer and InSe due to the alignment of the Fermi level. Based on this assumption, they inferred that the external electric field was ascribed to the accumulation of induced electrons at the surface oxidation sites, producing an electrostatic potential on the InSe surface layer. In summary, the demonstrated characteristics indicate that the engineering of an InSe interface has potential applications for nonvolatile memory. (Reported by Cheng- Maw Cheng) This report features the work of Yi-Ying Lu, Chia-Hao Chen and their collaborators published in ACS Appl. Mater. Interfaces 13 , 4618 (2021). TLS 09A1 SPEM • XPS, AES, photoabsorption, and other spectra • Materials Science, Condensed-matter Physics Reference 1. Y.-Y. Lu, Y.-T. Peng, Y.-T. Huang, J.-N. Chen, J. Jhou, L.-W. Lan, S.-H. Jian, C.-C. Kuo, S.-H. Hsieh, C.-H. Chen, R. San- kar, F.-C. Chou, ACS Appl. Mater. Interfaces 13 , 4618 (2021). Fig. 1 : Operando scanning photoelectron microscopic characterization of van der Waals gate devices. (a) Schematic of the operando SPEM measurement setup. (b,c) Optical images of pristine (top) and oxygen-plasma-treated devices (bottom). (d,e) Photoelectron intensity mapping of the Se 3 d core-level spectra of pristine (top) and oxygen plasma-treated devices (bottom). [Reproduced from Ref. 1] A Double Perovskite Oxide Shows the Way for High Performance of Electrocatalytic Water Oxidation In-situ/operando X-ray absorption spectra of double perovskite Sr 2 CoIrO 6−δ identify the role of an uncommon hexavalent Ir 6+ configuration in accelerating electrocatalytic water oxidation. A main goal of the recently held UN Climate Change Conference was to secure global net-zero emissions of carbon dioxide by 2050. To achieve this goal, countries must phase out the use of coal, decrease deforestation, speed up switching to electric vehicles and increase renewable energy sources. The challenge of improved renewable energy technologies is thus an important part of saving our planet from severe climate change. Identifying materials that are efficient electrochemical catalysts is a major requirement of renewable energy technologies. Further, to develop such materials, it is necessary to understand the mechanism of the oxygen-evolution reaction (OER) that exhibits sluggish reaction kinetics, and find ways to improve its efficiency. Oxygen evolution is the process of generating molecular oxygen (O 2 ) by a chemical reaction, generally from water, and occurs in photosynthesis, electrolysis of water and decomposition of oxides. In a recent report in Advanced Functional Materials, 1