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Instruments / Technical Area	Publication Details	Published	Actions
I14-Hard X-ray Nanoprobe	Untangling the role of capping agents in manipulating electrochemical behaviors toward practical aqueous zinc-ion batteries Ruwei Chen , Yunpeng Zhong , Peie Jiang , Hao Tang , Fei Guo , Yuhang Dai , Jie Chen , Jingyi Wang , Jiyang Liu , Song Wei , Wei Zhang , Wei Zong , Fangjia Zhao , Jichao Zhang , Zhengxiao Guo , Xiaohui Wang , Guanjie He Advanced Materials 34 DOI: 10.1002/adma.202412790 Diamond Proposal Number(s): [36785] Open Access Show Abstract ▼ Abstract: Long-standing challenges including notorious side reactions at the Zn anode, low Zn anode utilization, and rapid cathode degradation at low current densities hinder the advancement of aqueous zinc-ion batteries (AZIBs). Inspired by the critical role of capping agents in nanomaterials synthesis and bulk crystal growth, a series of capping agents are employed to demonstrate their applicability in AZIBs. Here, it is shown that the preferential adsorption of capping agents on different Zn crystal planes, coordination between capping agents and Zn2+ ions, and interactions with metal oxide cathodes enable preferred Zn (002) deposition, water-deficient Zn2+ ion solvation structure, and a dynamic cathode-electrolyte interface. Benefiting from the multi-functional role of capping agents, dendrite-free Zn plating and stripping with an improved Coulombic efficiency of 99.2% and enhanced long-term cycling stability are realized. Remarkable capacity retention of 91% is achieved for cathodes after more than 500 cycles under a low current density of 200 mA g−1, marking one of the best cycling stabilities to date. This work provides a proof-of-concept of capping agents in manipulating electrochemical behaviors, which should inspire and pave a new avenue of research to address the challenges in practical energy storage beyond AZIBs.	Jan 2025
B18-Core EXAFS	Effective ensemble of pt single atoms and clusters over the (Ni,Co)(OH)2 substrate catalyzes highly selective, efficient, and stable hydrogenation reactions Lihua Zhu , Yilun Sun , Huaze Zhu , Guoliang Chai , Zhiqing Yang , Congxiao Shang , Hengqiang Ye , Bing Hui Chen , Anna Kroner , Zhengxiao Guo Acs Catalysis DOI: 10.1021/acscatal.2c01901 Diamond Proposal Number(s): [29684] Show Abstract ▼ Abstract: A Pt–Ni–Co catalyst was synthesized with Pt single atoms and atomic clusters (SAACs) dispersed over (Ni,Co)(OH)2 nanoparticles on a carbon matrix, which leads to high catalytic activity, up to 100% conversion, and selectivity in the hydrogenation of nitroaromatics under moderate conditions (H2 ∼ 1.0 MPa and ≤40 °C). A synergistically coordinated ensemble effect of the Pt SAACs is identified with the strongly polarized Pt single atoms preferentially adsorbing the −NO2 and the Pt clusters adsorbing and homolytically dissociating H2 molecules, and the H species then readily move to the adsorbed −NO2 group, overcoming a much reduced energy barrier on the (Ni,Co)(OH)2, enhancing the reaction rate by ca. 50 times. The approach not only reveals the coordinated ensemble catalysis mechanism of SAACs but also provides a strategy of developing highly efficient and selective catalysts by fine tuning of the electronic microenvironment from single atoms to atomic clusters co-located over a multimetallic substrate. The demonstrated case for nitroarenes can be readily applied for other species containing −NO2 or other easily hydrogenated groups (such as C═C, C≡N, and C═O).	Jun 2022

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