Modulating Dominant Facets of Pt through Multistep Selective Anchored on WC for Enhanced Hydrogen Evolution Catalysis

Abstract

Facilitating the exposure of the active crystal facets on the surfaces of composite catalysts is a representative route to promote catalytic activity. Based on a tailored galvanic replacement reaction, herein, a self-assembly route is reported to prepare Pt−WC/CNT with Pt (200) preferential orientation and well-dispersed structure, which are capable of substantially boosting electrocatalysis in hydrogen evolution reaction (HER). Formation mechanism reveals that the (200)-dominated Ptbased catalysts form in galvanic replacement reaction through selective anchored on WC, and the multistep galvanic replacement process plays a critical role to realize the Pt (200)-dominated growth in higher Pt loading catalyst. These unique structural features endow the Pt−WC/CNT with a high turnover frequency of 94.18 H 2 •s −1 at 100 mV overpotential, 7-fold higher than that of commercial Pt/C (13.55 H 2 •s −1 ), ranking it among the most active catalysts. In addition, this method, which combines with gas−solid reaction and galvanic replacement reaction, paves the way to scalable synthesis as Pt facets-controllable composite catalysts to challenge commercial Pt/C.

Design and Synthesis of Noble Metal‐Based Alloy Electrocatalysts and Their Application in Hydrogen Evolution Reaction

“…The overpotential and Tafel slope of the PtAg nanoplates in acidic solution were 52 mV and 42 mV dec −1 , respectively. Chu et al [ 78 ] first synthesized the precursor of Fe WC and obtained the Fe‐WC nanostructure supported by carbon nanotubes after pyrolysis. Finally, Pt‐WC/CNT was obtained by Galvanic replacement using H 2 PtCl 6 .…”

CoFe-Layered Double Hydroxide Needles on MoS2/Ni3S2 Nanoarrays for Applications as Catalysts for Hydrogen Evolution and Oxidation of Organic Chemicals

“…It is of significance to develop bifunctional electrocatalysts that can realize high efficiency in both hydrogen evolution reaction (HER) and OER, which is due to their integrated advantages in simplifying the reaction system and reducing costs for the electrolysis of water. − To date, Pt-based alloys and Ir/Ru-based oxides possess superior electrocatalytic performance for HER and OER, respectively. However, their scarcity and high price hinder their industrial application. − MoS 2 possesses the Gibbs free energy of H adsorption theoretically closest to Pt, thus exhibiting fascinating HER performance. , The application of MoS 2 in overall water splitting (OWS) is hampered owing to its inferior conductivity, limited edge sites, and inert OER performance. , …”

Ultrafine Pt nanoparticle-decorated multi-folded two-dimensional nanosheets for efficient electrocatalytic hydrogen evolution

“…Platinum (Pt) with optimal hydrogen binding energy and Gibbs free energy for atomic adsorption of hydrogen, is regarded as the best hydrogen precipitation catalyst in both acidic and basic environments. [7][8][9] However, the desired reaction kinetics leads to the demand for a higher Pt loading in the catalysts, which makes the fabrication cost prohibitive. 10 Non-precious metal catalysts have attracted a lot of attention, but there is still disparity compared with Ptbased catalysts in activity, impeding their industrialization.…”