Gaykwad, BhagyashriBhagyashriGaykwadRobinson, Donald A.Donald A.RobinsonHumphrey, NicholasNicholasHumphreyWenzel, Samuel F.Samuel F.WenzelHui, CarlyCarlyHuiMcCoy, NataliaNataliaMcCoyGabaly, Farid ElFarid ElGabalySugar, Joshua D.Joshua D.SugarWitman, Matthew D.Matthew D.WitmanJasuja, KabeerKabeerJasujaRen, HangHangRenStavila, VitalieVitalieStavila2026-04-012026-04-012026-03-011359-734510.1039/D6CC00243Ahttps://repository.iitgn.ac.in/handle/IITG2025/34952Pt and Pt-Cu alloy nanoparticles (NPs) were synthesized via a scalable aqueous co-reduction process using boron-rich nanosheets (BNS). The aqueous-derived BNS react with PtCl62- to form Pt NPs and with Cu2+ to form a BNS-bound Cu(I/II) complex. When both metal precursors are present, metallic Cu is incorporated into Pt-Cu NPs, with Pt catalyzing the reduction of Cu2+. Alloy composition was systematically varied to evaluate catalytic performance for the hydrogen oxidation reaction (HOR) in alkaline media. The optimal Pt77Cu23/BNS catalyst composition exhibits high Pt surface specific activity, outperforming both Pt/BNS and a commercial Pt/C catalyst. Our DFT calculations atribute the enhanced HOR activity to composition-dependent tuning of the d-band center, which modulates the adsorption strength of reaction intermediatesen-USArticle1364-548X