Engineering local coordination environment of atomically dispersed platinum catalyst via lattice distortion of support for efficient hydrogen evolution reaction. (June 2021)

• Record Type: Journal Article
• Authors: Cheng, Xing; Lu, Yue; Zheng, Lirong; Pupucevski, Max; Li, Hongyi; Chen, Ge; Sun, Shaorui; Wu, Gang
• Is Part Of: Materials today energy. Volume 20(2021)
• Publication Date: 2021-06
• Subjects: Single atom -- Oxygen vacancy -- Local structural distortion -- HER -- Electrocatalyst; Energy development -- Periodicals; Energy industries -- Periodicals; Power resources -- Periodicals; Energy policy -- Periodicals; Energy development; Energy industries; Energy policy; Power resources; Electronic journals; Periodicals; 621.042
• DOI: 10.1016/j.mtener.2021.100653
• Languages: English
• ISSNs: 2468-6069

Abstract

Abstract: Engineering the local coordination environment in atomically dispersed catalyst has proven to be a prospective route to boost catalyst performance for hydrogen evolution reaction (HER). Herein, we present the utilization of local lattice distortion of TiO2 support to regulate the local coordination environment and electronic structures of atomically dispersed Pt catalysts, resulting in the enhanced performance toward HER. Spectral analysis uncovers an elongated Pt–O bond length, lower Pt–O coordination numbers, as well as less electron holes residing in Pt 5d orbitals for Pt species on distorted TiO2 . Density functional theory (DFT) calculation reveal that the variation might weaken the hydrogen adsorption on Pt sites and cause the optimized ΔG value of H∗. As a result, the atomically dispersed Pt catalyst displays superior HER mass activity (62.34 A mg −1 Pt) and the highest turnover frequency (TOF) (56.1H2 ·s −1 ) at the 50 mV overpotential in an acid media that are 18.7 and 5.56 times higher than commercial Pt/C. The work should create a new avenue in manipulating the local coordination environment of catalysts via the lattice distortion of the support, and in pursuing desired catalytic performance. Graphical abstract: Image 1 Highlights: The introduced oxygen vacancies (OVs) in the TiO2 support lead to the lattice distortion of the TiO2 . Distortion of local lattice induces the elongated Pt–O bond length and less electron holes residing in Pt 5d orbitals. The atomically dispersed platinum catalyst Pt/TiO2 -OVs has enhanced catalytic activity for HER in acid media.