Engineering Bimodal Oxygen Vacancies and Pt to Boost the Activity Toward Water Dissociation. Issue 8 (10th December 2021)

• Record Type: Journal Article
• Authors: Shen, Ruofan; Liu, Yanyan; Wen, Hao; Wu, Xianli; Han, Guosheng; Yue, Xinzheng; Mehdi, Sehrish; Liu, Tao; Cao, Huaqiang; Liang, Erjun; Li, Baojun
• Is Part Of: Small. Volume 18:Issue 8(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2021-12-10
• Subjects: ammonia borane -- electron promoters -- oxygen vacancies -- platinum -- water dissociation; Nanotechnology -- Periodicals; Nanoparticles -- Periodicals; Microtechnology -- Periodicals; 620.5
• DOI: 10.1002/smll.202105588
• Languages: English
• ISSNs: 1613-6810

Abstract

Abstract: Water dissociation is the rate‐limiting step of several energy‐related reactions due to the high energy barrier required for breaking the oxygen–hydrogen bond. In this work, a bimodal oxygen vacancy (VO ) catalysis strategy is adopted to boost the efficient water dissociation on Pt nanoparticles. The single facet‐exposed TiO2 surface and NiO x nanocluster possess two modes of VO different from each other. In ammonia borane hydrolysis, the highest catalytic activity among Pt‐based materials is achieved with the turnover frequency of 618 min −1 under alkaline‐free conditions at 298 K. Theoretical simulation and characterization analyses reveal that the bimodal VO significantly promotes the water dissociation in two ways. First, an ensemble‐inducing effect of Pt and VO in TiO2 drives the activation of water molecules. Second, an electron promoter effect induced by the electron transfer from VO in NiO x to Pt further enhances the ability of Pt to dissociate water and ammonia borane. This insight into bimodal VO catalysis establishes a new avenue to rationally design heterogeneous catalytic materials in the energy chemistry field. Abstract : Bimodal oxygen vacancies (VO ) effect contributing to high efficacy water dissociation is demonstrated. The highest turnover frequency (618 min −1 ) is achieved in ammonia borane (AB) hydrolysis. The existence of VO in TiO2 and Pt activate H2 O. The electron promoter effect is induced by the electron transfer from the VO in NiO x to Pt, leading to an electron‐rich Pt surface, improving intrinsic catalytic activity of Pt toward water and AB dissociation.