Monodispersed Pt Sites Supported on NiFe‐LDH from Synchronous Anchoring and Reduction for High Efficiency Overall Water Splitting

Abstract

Precise design of low‐cost, efficient and definite electrocatalysts is the key to sustainable renewable energy. Herein, this work develops a targeted‐anchored and subsequent spontaneous‐redox strategy to synthesize nickel‐iron layered double hydroxide (LDH) nanosheets anchored with monodispersed platinum (Pt) sites (Pt@LDH). Intermediate metal‐organic frameworks (MOF)/LDH heterostructure not only provides numerous confine points to guarantee the stability of Pt sites, but also excites the spontaneous reduction for PtII. Electronic structure, charge transfer ability and reaction kinetics of Pt@LDH can be effectively facilitated by the monodispersed Pt moieties. As a result, the optimized Pt@LDH that with the 5% ultra‐low content Pt exhibits the significant increment in electrochemical water splitting performance in alkaline media, which only afford low overpotentials of 58 mV at 10 mA cm−2 for hydrogen evolution reaction (HER) and 239 mV at 10 mA cm−2 for oxygen evolution reaction (OER), respectively. In a real device, Pt@LDH can drive an overall water‐splitting at low cell voltage of 1.49 V at 10 mA cm−2, which can be superior to most reported similar LDH‐based catalysts. Moreover, the versatility of the method is extended to other MOF precursors and noble metals for the design of ultrathin LDH supported monodispersed noble metal electrocatalysts promoting research interest in material design.

High‐Valence Metal Doping Induced Lattice Expansion for M‐FeNi LDH toward Enhanced Urea Oxidation Electrocatalytic Activities

“…[31] The Fe 2p 3/2 signals of Mo-FeNi LDH and FeNi-LDH split into two peaks, of which the peak at 708.1 eV was attributed to the Fe III oxidation state. [32] The peak at 712.1 eV that was assigned to the Fe II spectrum exhibited a slight shift of 0.2 eV to lower binding energies, confirming that the electronic configuration had changed after the introduction of Mo metal ions. Two typical peaks appeared around 855.6 and 873.4 eV in the Ni 2p spectra can be attributed to Ni 2p 3/2 and Ni 2p 1/2 , [33] respectively.…”

Electrocatalysts for the oxygen evolution reaction: mechanism, innovative strategies, and beyond

“…Recent research has indicated that the type and quantity of defects significantly impact the catalytic activity of crystalline material catalysts. [37][38][39] Although crystal defects play a crucial role in catalytic materials, their diversity and complex nature make their study challenging. Consequently, a systematic review of defective state catalysts is necessary to facilitate an improved comprehension and design of catalysts.…”

High-Density Ultrafine Au Nanocluster-Doped Co-LDH Nanocages for Enhanced Visible-Light-Driven CO2 Reduction

“…Compared with the fear of complex and fine regulation of semiconductor catalysts, exploring alternative traditional semiconductor photocatalysts may be a feasible strategy. Layered double hydroxide (LDH), as a promising photocatalyst, has been extensively studied in CO 2 photoreduction systems owing to its tunable electronic structure and band gap ( E g ), unique layered structure, low cost, ease of scale-up, and the fact that it is expected to be able to replace TiO 2 , etc., traditional semiconductors. − Some preliminary studies have also revealed that specific co-catalysts (e.g., Pt, Pd) can facilitate electron transfer and separation efficiency during the reaction. − However, the integration of the three elements (high CO 2 adsorption capacity, light capture capacity, and rapid separation of photogenerated charges) of photocatalysis into one LDH-based photocatalyst is still rarely reported.…”