Evaluating electrocatalytic activity of metal-substituted hafnium diboride (Hf1-TMB2; TM = Ni and Co) toward water splitting

Design of metal‐substituted tungsten diboride as an efficient bifunctional electrocatalyst for hydrogen and oxygen evolution

“…For the carbothermal reduction, the previous work of our group was taken as a reference. 28 WO 3 , B 2 O 3 , and activated carbon powder were used as the main ingredients to manufacture the virgin WB 2 . Identical to previous section, the substitution reactions proceeded with various atomic percentages of Ni and Co (x = 0, 0.1, 0.2, and 0.3).…”

“…Identical to our earlier reports 20,[28][29][30] and similar to the molten salt technique, all the preparation, weighing, and transferring of the precursors into the stainless-steel vial were conducted in an Ar-filled glovebox. The powder precursor was mechanically activated for 180 minutes at 1200 rpm.…”

“…In this context, the electronic structure of a catalyst is indeed a game-changer that can directly impact electronic states, band structures, and adsorption capacity. 6,28 To this end, elemental doping has been suggested not only as a straightforward but also a practical approach to fine-tune the electronic structure. 6,28 Thus far, we have investigated the role of several TMs (Fe, Co, Ni, and Cu) in the structure of AlB 2 -type MDbs (MgB 2 , ZrB 2 , VB 2 , and HfB 2 ) for the alkaline electrolysis of HER and OER.…”

“…6,28 To this end, elemental doping has been suggested not only as a straightforward but also a practical approach to fine-tune the electronic structure. 6,28 Thus far, we have investigated the role of several TMs (Fe, Co, Ni, and Cu) in the structure of AlB 2 -type MDbs (MgB 2 , ZrB 2 , VB 2 , and HfB 2 ) for the alkaline electrolysis of HER and OER. 20,[28][29][30] On the basis of experimental studies, it was concluded that Co-and Ni-bearing materials are superior electrocatalysts as opposed to Fe-and Cu-bearing counterparts.…”

“…6,28 Thus far, we have investigated the role of several TMs (Fe, Co, Ni, and Cu) in the structure of AlB 2 -type MDbs (MgB 2 , ZrB 2 , VB 2 , and HfB 2 ) for the alkaline electrolysis of HER and OER. 20,[28][29][30] On the basis of experimental studies, it was concluded that Co-and Ni-bearing materials are superior electrocatalysts as opposed to Fe-and Cu-bearing counterparts. Inspired by the earlier investigations and encouraged by our recent research on the various MDbs, herein, we present the electrochemical attributes of W (1-x) TM x B 2 (TM = Ni and Co; x = 0, 0.1, 0.2, and 0.3) toward OER and HER.…”