Yang Jun, Shen Yong, Sun Yamei, Xian Jiahui, Long Yanju, Li Guangqin
MOE Laboratory of Bioinorganic and Synthetic Chemistry, Lehn Institute of Functional Materials, School of Chemistry, Sun Yat-Sen University, Guangzhou, 510006, China.
School of Chemistry, Sun Yat-sen University, Guangzhou, 510006, China.
Angew Chem Int Ed Engl. 2023 Apr 17;62(17):e202302220. doi: 10.1002/anie.202302220. Epub 2023 Mar 20.
The construction of high-activity and low-cost electrocatalysts is critical for efficient hydrogen production by water electrolysis. Herein, we developed an advanced electrocatalyst by anchoring well-dispersed Ir nanoparticles on nickel metal-organic framework (MOF) Ni-NDC (NDC: 2,6-naphthalenedicarboxylic) nanosheets. Benefiting from the strong synergy between Ir and MOF through interfacial Ni-O-Ir bonds, the synthesized Ir@Ni-NDC showed exceptional electrocatalytic performance for hydrogen evolution reaction (HER), oxygen evolution reaction (OER) and overall water splitting in a wide pH range, superior to commercial benchmarks and most reported electrocatalysts. Theoretical calculations revealed that the charge redistribution of Ni-O-Ir bridge induced the optimization of H O, OH* and H* adsorption, thus leading to the accelerated electrochemical kinetics for HER and OER. This work provides a new clue to exploit bifunctional electrocatalysts for pH-universal overall water splitting.
构建高活性、低成本的电催化剂对于通过水电解高效制氢至关重要。在此，我们通过将分散良好的铱纳米颗粒锚定在镍金属有机框架（MOF）Ni-NDC（NDC：2,6-萘二甲酸）纳米片上，开发了一种先进的电催化剂。得益于铱与MOF之间通过界面Ni-O-Ir键形成的强协同作用，合成的Ir@Ni-NDC在宽pH范围内对析氢反应（HER）、析氧反应（OER）和全水分解表现出优异的电催化性能，优于商业基准和大多数已报道的电催化剂。理论计算表明，Ni-O-Ir桥的电荷重新分布导致H O、OH和H吸附的优化，从而加速了HER和OER的电化学动力学。这项工作为开发用于pH通用全水分解的双功能电催化剂提供了新的线索。
