High Valence M-Incorporated PdCu Nanoparticles (M = Ir, Rh, Ru) for Water Electrolysis in Alkaline Solution

Abstract

The high-valence metal catalysts show extraordinary talent in various electrochemical reactions. However, there is no facile method to synthesize high-valence noble metal-based materials. Herein, we synthesized the different high valence noble metal M-incorporated PdCu nanoparticles (M = Ir, Ru, Rh) by the assistant of Fe3+ and exhibit excellent performance for water electrolysis. In 0.1 M KOH, the OER and HER mass activities of Ir16–PdCu/C were 50.5 and 16.5 times as much as PdCu/C, and achieved a current density of 10 mA cm–2 at 1.63 V when worked for overall water splitting. DFT calculation revealed that the incorporating of high valence Ir could optimize the binding energy of the intermediate products, and promote the evolution of oxygen and hydrogen. Ex situ XPS shows that the huge amount of oxidized Ir (V) formed in OER could promote the formation of OO bonds.

Deciphering the Space Charge Effect of the p–n Junction between Copper Sulfides and Molybdenum Selenides for Efficient Water Electrolysis in a Wide pH Range

“…In general, the surface charge state of constructed materials was greatly determined by the electrocatalytic performance of catalysts. ,,− Therefore, it is still an interesting topic in how to manipulate the surface electron state to improve the activity of synthesized electrocatalysts during catalytic reactions. In recent years, the surface vacancy, heteroatom doping, strain regulation, and phase transition have been proved to enhance the electrocatalytic performance by regulating the electronic structure of the active sites, charge density, and electron transfer ability. ,− In addition, the electron density of intrinsic electrocatalytic activity sites also can be adjusted by organic groups which have various properties of electrophilicity/nucleophilicity. , More active sites would be produced, and their electron configuration would be adjusted by heteroatomic bonding for better catalytic performance. , Furthermore, Zhang’s group thinks that the selenates were enriched on the surface and play important roles combined with the severe Se leaching and the strong signal of selenates, and the OER activity of Ni­(OH) 2 would be enhanced dramatically by adding selenites to the electrolyte.…”

Construction of CoNiFe Trimetallic Carbonate Hydroxide Hierarchical Hollow Microflowers with Oxygen Vacancies for Electrocatalytic Water Oxidation

“…[ 2 ] To date, noble metal Ru‐, Ir‐, Rh‐based compounds as state‐of‐art OER electrocatalysts show unrivaled catalytic performance. [ 3 ] Considering the scarcity, high costs, and low stability of these benchmark noble‐based materials, it is urgent to develop high‐performance candidates based on earth‐abundant transition‐metal‐based materials. [ 4 ]…”

Exploring the synergistic effect of alloying toward hydrogen evolution reaction: a case study of Ni3M (M = Ti, Ge and Sn) series

“…Pt, Ir or Ru) as an electrocatalyst. 4 The high price and low reserves of noble metals make AWE very challenging to be applied worldwide at domestic or industrial scale.…”