The future of sustainable energy supply demands innovative breakthroughs in the design of cheap and durable catalysts for efficient electrochemical water splitting. Distinct from the conventional doping, defecting, and nanostructuring strategy, we develop a simple and feasible electric-strain way to trigger electrocatalyst’s structural phase transition via regulating carrier distribution, realizing an excellent hydrogen evolution reaction (HER) performance. Herein, thanks to the intrinsic noncentrosymmetric polarization of our designed Janus MoReS₃ nanostructures, large numbers of carriers are energetically pulled into the catalyst’s interior to generate electric strain, leading to the deformation of the charged MoReS₃ nanosheets and transition from T′ phase to another reversible atomic configuration (T″ phase) with higher catalytic activity and faster carrier transfer. The electric-strain-generated T″-MoReS₃ shows HER performances in excess of a commercial Pt/C electrode at large current densities, reaching a current density of 150 mA cm⁻² at an overpotential of 189 mV.

可持续能源供应的未来要求在廉价和耐用的催化剂设计方面进行创新性突破，以实现高效的电化学水分解。与常规的掺杂，缺陷和纳米结构化策略不同，我们开发了一种简单可行的电应变方法，可通过调节载流子分布来触发电催化剂的结构相变，从而实现出色的氢释放反应（HER）性能。在此，由于我们设计的Janus MoReS ₃纳米结构的固有非中心对称极化，大量载流子被有力地拉入催化剂内部以产生电应变，从而导致带电的MoReS ₃变形纳米片并从T'相转变为具有更高催化活性和更快载流子的可逆原子构型（T''相）。电应变产生的T''-MoReS ₃在大电流密度下显示出超过商用Pt / C电极的HER性能，在189 mV的超电势下达到150 mA cm ^-2的电流密度。