Te-template approach to fabricating ternary TeCuPt alloy nanowires with enhanced catalytic performance towards oxygen reduction reaction and methanol oxidation reaction

Abstract

Fabricating ternary Pt-based alloys has emerged as a promising strategy to further enhance the catalytic performance of Pt catalyst in direct methanol fuel cell (DMFC) for both oxygen reduction reaction (ORR) and methanol oxidation reaction (MOR).Herein we reported for the first time the synthesis of ternary TeCuPt nanowires (NWs) by a Te-template-directed galvanic replacement reaction, in which Te NWs served as both sacrificial templates and reducing agents. Compared with binary TePt alloy and pure Pt catalysts, the ternary TeCuPt alloys exhibited a more positive half-wave potential and higher specific area/mass activity for ORR, and it also displayed a better CO tolerance ability and long-term stability for MOR. The enhanced catalytic performance for TeCuPt NWs was attributed to the electronic and geometric structure effects, originating from the Pt alloying with both Te and Cu components, which could weaken the binding strength between Pt surface atoms and intermediate species (e.g. OH*, CO*). Our studies demonstrated a new alternative ternary Pt-based catalyst

TePtFe Nanotubes as High‐Performing Bifunctional Electrocatalysts for the Oxygen Reduction Reaction and Hydrogen Evolution Reaction

“…As shown in Figure 2a,anegative shift of the (111)p lane occurs in binary Te Pt NTs, relative to that of Pt/C, due to the larger atomic size of Te than that of Pt. [38] The binding energies and chemical states of Pt in Te PtFe NTs, Te Pt NTs, andP t/C were examinedb yX PS. [37] As shown in Figure S1 bi nt he Supporting Information, U-Te PtNTs/C shows ad iffractionp eak at 30.28,w hich can be assignedt oT e; this indicates that, without KOH treatment of NTs, excessu nreactedT em ay appear on the outer wall of NTs.…”

“…[53,54] 2) Compared with Pt atoms,t he Te and Fe atomsi ntroduced, which form the Pt overlayero fT ePtFe NTs, have ac ontracted interatomic distance between Pt atoms, in comparison with that of pure Pt. [31,38] After durability tests, Te PtFe NTs/C catalysts were carefully scratched off the electrode for further TEM observation. [31,38] After durability tests, Te PtFe NTs/C catalysts were carefully scratched off the electrode for further TEM observation.…”

“…[37] As shown in Figure S1 bi nt he Supporting Information, U-Te PtNTs/C shows ad iffractionp eak at 30.28,w hich can be assignedt oT e; this indicates that, without KOH treatment of NTs, excessu nreactedT em ay appear on the outer wall of NTs. [38] The binding energies and chemical states of Pt in Te PtFe NTs, Te Pt NTs, andP t/C were examinedb yX PS. The chemical states of Pt in Te PtFe NTs/C, TePt NTs/C, and Pt/C are shown in Figure2ba nd Figure S2 in the Supporting Information.…”

“…As ar esult, compressive strain applied to atomso ft he Pt surfacecould be enhanced, which is favorable for restructuring of the surface Pt atoms during stability testing. [31,38] After durability tests, Te PtFe NTs/C catalysts were carefully scratched off the electrode for further TEM observation. Interestingly, after ADT, the whole NT structure of Te PtFe NTsstill remains ( Figure S7 in the Supporting Information).…”

Scalable Synthesis of Ag Networks with Optimized Sub-monolayer Au-Pd Nanoparticle Covering for Highly Enhanced SERS Detection and Catalysis

“…Due to the simultaneous consumption of substrate material while adding newly growing crystals, GRR can result in hierarchically porous surfaces with many active corners and edges33. However, previous reports mainly focused on the synthesis of hollow3435, core-shell242536, or alloyed3738 nanostructures via GRR, accessible active inter-metal interfaces are limited, and the necessary amount of very expensive metals like Ru34, Pd3538, Pt37 and Au36 are high. It is expected that products through a GRR starting with highly porous interconnecting networks should have hierarchical structures with pore sizes from micron to only a few nanometers39.…”