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Revealing the Formation Mechanism and Optimizing the Synthesis Conditions of Layered Double Hydroxides for the Oxygen Evolution Reaction |
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| Authors: | Dr Zongkun Chen Xingkun Wang Dr Zhongkang Han Dr Siyuan Zhang Dr Simone Pollastri Qiqi Fan Dr Zhengyao Qu Debalaya Sarker Prof Christina Scheu Prof Minghua Huang Prof Helmut Cölfen |
| Institution: | 1. University of Konstanz, 78457 Konstanz, Germany;2. School of Materials Science and Engineering, Ocean University of China, 266100 Qingdao, China
These authors contributed equally to this work. Contribution: Data curation (lead), Formal analysis (equal), Investigation (lead), Methodology (lead);3. Fritz-Haber-Institut der Max-Planck-Gesellschaft, 14195 Berlin, Germany These authors contributed equally to this work. Contribution: Data curation (equal), Software (equal);4. Max-Planck-Institut für Eisenforschung GmbH, 40237 Düsseldorf, Germany Contribution: Data curation (equal), Investigation (equal);5. Elettra-Sincrotrone Trieste Basovizza, Trieste, Italy Contribution: Investigation (equal), Methodology (supporting);6. University of Konstanz, 78457 Konstanz, Germany Contribution: Investigation (equal);7. Agency for Science, Technology and Research, Singapore, 138634 Singapore Contribution: Investigation (supporting), Methodology (supporting);8. Fritz-Haber-Institut der Max-Planck-Gesellschaft, 14195 Berlin, Germany Contribution: Investigation (supporting);9. Max-Planck-Institut für Eisenforschung GmbH, 40237 Düsseldorf, Germany Contribution: Investigation (supporting);10. School of Materials Science and Engineering, Ocean University of China, 266100 Qingdao, China |
| Abstract: | Layered double hydroxides (LDHs), whose formation is strongly related to OH− concentration, have attracted significant interest in various fields. However, the effect of the real-time change of OH− concentration on LDHs’ formation has not been fully explored due to the unsuitability of the existing synthesis methods for in situ characterization. Here, the deliberately designed combination of NH3 gas diffusion and in situ pH measurement provides a solution to the above problem. The obtained results revealed the formation mechanism and also guided us to synthesize a library of LDHs with the desired attributes in water at room temperature without using any additives. After evaluating their oxygen evolution reaction performance, we found that FeNi-LDH with a Fe/Ni ratio of 25/75 exhibits one of the best performances so far reported. |
| Keywords: | Formation Mechanism Layered Double Hydroxide OH− Concentration Oxygen Evolution Reaction In Situ Characterization |