KAUST Catalysis Center (KCC) and Physical Science and Engineering Division (PSE), King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Saudi Arabia.
Advanced Nanofabrication, Imaging and Characterization Core Lab, King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Saudi Arabia.
Angew Chem Int Ed Engl. 2017 May 15;56(21):5780-5784. doi: 10.1002/anie.201701861. Epub 2017 Apr 13.
For overall water-splitting systems, it is essential to establish O -insensitive cathodes that allow cogeneration of H and O . An acid-tolerant electrocatalyst is described, which employs a Mo-coating on a metal surface to achieve selective H evolution in the presence of O . In operando X-ray absorption spectroscopy identified reduced Pt covered with an amorphous molybdenum oxyhydroxide hydrate with a local structural order composed of polyanionic trimeric units of molybdenum(IV). The Mo layer likely hinders O gas permeation, impeding contact with active Pt. Photocatalytic overall water splitting proceeded using MoO /Pt/SrTiO with inhibited water formation from H and O , which is the prevailing back reaction on the bare Pt/SrTiO photocatalyst. The Mo coating was stable in acidic media for multiple hours of overall water splitting by membraneless electrolysis and photocatalysis.
对于整体水分解系统，建立允许 H 和 O 共产生的 O 不敏感阴极至关重要。本文描述了一种耐酸的电催化剂，它在金属表面上采用 Mo 涂层，在存在 O 的情况下实现 H 的选择性析出。在位 X 射线吸收光谱确定了被还原的 Pt 被无定形的钼氧氢氧化物水合物覆盖，该水合物具有由钼(IV)的多阴离子三聚体单元组成的局部结构有序。Mo 层可能阻碍 O 气体渗透，阻止与活性 Pt 接触。使用 MoO /Pt/SrTiO 进行光催化整体水分解，抑制了来自 H 和 O 的水形成，这是裸 Pt/SrTiO 光催化剂上普遍的逆反应。Mo 涂层在无膜电解和光催化的整体水分解中，在酸性介质中稳定数小时。
