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Instruments / Technical Area	Publication Details	Published	Actions
I18-Microfocus Spectroscopy	Effect of Li6.4La3Zr1.4Ta0.6O12 fillers on the interfacial properties between composite PEO-LiTFSI electrolytes with Li metal during cycling Lun Zhang , Junrun Feng , Guanghan Zhu , Jay Yan , Stuart Bartlett , Zhipeng Wang , Zhangxiang Hao , Zhonghui Gao , Ryan Wang Acs Applied Materials & Interfaces DOI: 10.1021/acsami.3c19519 Diamond Proposal Number(s): [30403, 33297] Show Abstract ▼ Abstract: PEO-LiX solid polymer electrolyte (SPE) with the addition of Li6.4La3Zr1.4Ta0.6O12 (LLZTO) fillers is considered as a promising solid-state electrolyte for solid-state Li-ion batteries. However, the developments of the SPE have caused additional challenges, such as poor contact interface and SPE/Li interface stability during cycling, which always lead to potentially catastrophic battery failure. The main problem is that the real impact of LLZTO fillers on the interfacial properties between SPE and Li metal is still unclear. Herein, we combined the electrochemical measurement and in situ synchrotron-based X-ray absorption near-edge structure (XANES) imaging technology to study the role of LLZTO fillers in directing SPE/Li interface electrochemical performance. In situ XRF-XANES mapping during cycling showed that addition of an appropriate amount of LLZTO fillers (50 wt %) can improve the interfacial contact and stability between SPE and Li metal without reacting with the PEO and Li salts. Additionally, it also demonstrated the beneficial effect of LLZTO particles for suppressing the interface reactions between the Li metal and PEO-LiTFSI SPE and further inhibiting Li-metal dendrite growth. The Li\|LiFePO4 batteries deliver long cycling for over 700 cycles with a low-capacity fade rate of 0.08% per cycle at a rate of 0.3C, revealing tremendous potential in promoting the large-scale application of future solid-state Li-ion batteries.	Mar 2024
B07-C-Versatile Soft X-ray beamline: Ambient Pressure XPS and NEXAFS B18-Core EXAFS E01-JEM ARM 200CF	Designing reactive bridging O2– at the atomic Cu-O-Fe site for selective NH3 oxidation Xuze Guan , Rong Han , Hiroyuki Asakura , Zhipeng Wang , Siyuan Xu , Bolun Wang , Liqun Kang , Yiyun Liu , Sushila Marlow , Tsunehiro Tanaka , Yuzheng Guo , Feng Ryan Wang Acs Catalysis DOI: 10.1021/acscatal.2c04863 Diamond Proposal Number(s): [23759, 24450, 29094, 24197] Open Access Show Abstract ▼ Abstract: Surface oxidation chemistry involves the formation and breaking of metal–oxygen (M–O) bonds. Ideally, the M–O bonding strength determines the rate of oxygen absorption and dissociation. Here, we design reactive bridging O2– species within the atomic Cu–O–Fe site to accelerate such oxidation chemistry. Using in situ X-ray absorption spectroscopy at the O K-edge and density functional theory calculations, it is found that such bridging O2– has a lower antibonding orbital energy and thus weaker Cu–O/Fe–O strength. In selective NH3 oxidation, the weak Cu–O/Fe–O bond enables fast Cu redox for NH3 conversion and direct NO adsorption via Cu–O–NO to promote N–N coupling toward N2. As a result, 99% N2 selectivity at 100% conversion is achieved at 573 K, exceeding most of the reported results. This result suggests the importance to design, determine, and utilize the unique features of bridging O2– in catalysis.	Nov 2022

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