The overall water splitting for hydrogen production is an effective strategy to resolve the environmental and energy crisis. Here, we report a facile approach to synthesize the Ir-based multimetallic, hierarchical, double-coreshelled architecture (HCSA) assisted by oil bath reaction for boosting overall water splitting in acidic environment. The IrNiCu HCSA shows superior electrocatalytic activity for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER), which are comparable to commercial Pt/C and better than IrO₂. The IrNiCu HCSA exhibits remarkably catalytic efficiency as bifunctional catalyst for overall water splitting where a low cell voltage of 1.53 V is enough to drive a current density of 10 mA cm⁻² and maintains stable for at least 20 h. The presented work for the design and synthesis of novel Ir-based multimetallic architecture paves the way for highperformance overall water splitting catalysis.

用于制氢的总水分解是解决环境和能源危机的有效策略。在这里，我们报告了一种简便的方法来合成基于Ir的多金属，分级，双核壳结构（HCSA），并借助油浴反应来促进酸性环境中的总水分解。IrNiCu HCSA对氢气析出反应（HER）和氧气析出反应（OER）表现出优异的电催化活性，与市售Pt / C相当，并且优于IrO ₂。IrNiCu HCSA作为双官能催化剂在整个水分解中表现出显着的催化效率，其中1.53 V的低电池电压足以驱动10 mA cm ^-2的电流密度并保持稳定至少20小时。提出的用于设计和合成基于Ir的新型多金属结构的工作为高性能整体水分解催化铺平了道路。