Ti₃C₂T_x (MXene) is adopted as a potential electrocatalyst for energy conversion owing to its outstanding conductivity and tunable chemical surface. However, its intrinsic poor chemical activities and limited active site densities are detrimental to corresponding reactions, for example hydrogen evolution reaction (HER). In this work, MXene decorated by phosphorus-doped TiO₂ (P–TiO₂@Ti₃C₂) was successfully designed and synthesized through in-situ phosphorus-doped TiO₂ growth. Enhanced electronic conduction, extended light absorption, and promoted HER reaction kinetics were achieved by synchronously tuning phosphorous doping and oxygen vacancies (OVs). Compared with traditional MXene and corresponding derived materials, P–TiO₂@Ti₃C₂ exhibited Vis-NIR photo-enhanced electrocatalytic HER activity with a small overpotential of 97 mV (at 10 mA cm⁻²) and a low Tafel slope of 48.4 mV dec⁻¹, which performed more efficient than that in darkness. Moreover, the as-synthesized catalyst offered a distinct advantage of long-term stability for more than 50 h along with light irradiation. This work provides a novel strategy for constructing MXenes materials with advantageous structures for extensive photo-electrochemical applications.

Ti ₃ C ₂ T _x（MXene）具有出色的电导率和可调节的化学表面，因此被用作能量转换的潜在电催化剂。然而，其固有的不良化学活性和有限的活性位点密度不利于相应的反应，例如放氢反应（HER）。在这项工作中，通过原位掺磷的TiO ₂成功地设计和合成了由掺磷的TiO ₂（P–TiO ₂ @Ti ₃ C ₂）装饰的MXene。生长。通过同步调节磷掺杂和氧空位（OVs），可以增强电子传导，延长光吸收和促进HER反应动力学。与传统的MXene及其相应的衍生材料相比，P–TiO ₂ @Ti ₃ C ₂表现出Vis-NIR光增强的电催化HER活性，具有97 mV的小电势（在10 mA cm ^-2时）和低的Tafel斜率48.4 mV dec ^-1，其效果比在黑暗中要好。此外，合成后的催化剂具有超过50小时的长期稳定性以及光照射的明显优势。这项工作为构造具有有利结构的MXenes材料提供了一种新颖的策略，可用于广泛的光电化学应用。