Revealing the Formation Mechanism and Optimizing the Synthesis Conditions of Layered Double Hydroxides for the Oxygen Evolution Reaction. Issue 10 (1st February 2023)

• Record Type: Journal Article
• Authors: Chen, Zongkun; Wang, Xingkun; Han, Zhongkang; Zhang, Siyuan; Pollastri, Simone; Fan, Qiqi; Qu, Zhengyao; Sarker, Debalaya; Scheu, Christina; Huang, Minghua; Cölfen, Helmut
• Is Part Of: Angewandte Chemie international edition. Volume 62:Issue 10(2023)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2023-02-01
• Subjects: Formation Mechanism -- Layered Double Hydroxide -- OH− Concentration -- Oxygen Evolution Reaction -- In Situ Characterization; Chemistry -- Periodicals; 540
• DOI: 10.1002/anie.202215728
• Languages: English
• ISSNs: 1433-7851

Abstract

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. Abstract : The combination of NH3 gas diffusion and in situ pH measurement provides a way to investigate the effect of the real‐time change of OH − concentration on layered double hydroxide (LDH) formation. The results revealed the formation mechanism of LDHs and also guided the synthesis of a library of LDHs with desired attributes, in water at room temperature without using any additives.