In Situ Growth of Ultrafine Pt Nanoparticles onto Hierarchical Co₃O₄ Nanosheet‐Assembled Microflowers for Efficient Electrocatalytic Hydrogen Evolution

Abstract

The development of Pt-based electrocatalysts with high Pt utilization efficiency towardt he hydrogen evolution reaction(HER) is of great significance for the future sustainableh ydrogen economy.F or rational design of high-performanceH ER electrocatalyst, the simultaneous consideration of both thermodynamic and kinetic aspects remains greatlyc hallenging. Herein, as imple template-derived strategyi sd emonstrated for the in situ growth of ultrafine Pt nanoparticleso nto Co 3 O 4 nanosheet-assembled microflowers (abbreviated as Pt/Co 3 O 4 microflowers hereafter) by using the prefabricated PtCo-based Hofmann coordination polymer as reactive templates.T he elaborate preparation of such intriguing hierarchical architecture with well-dispersed tiny Pt nanoparticles,a bundant metal/ oxide heterointerfaces and open configuratione ndows the formed Pt/Co 3 O 4 microflowers with high Pt utilization efficiency,r ich active sites, lowerede nergy barrier for water dissociation and expedited reaction kinetics. Consequently,t he Pt/Co 3 O 4 microflowers exhibit superior HER activity with ar elatively low overpotential of 34 mV to deliver ac urrent density of 10 mA cm À2 ,s mall Tafel slope (34 mV dec À1)a nd outstanding electrochemical stability, representing an attractive electrocatalyst for practical water splitting. What's more, our concept of in situ construction of metal/oxide heterointerfaces may provide a new opportunity to design high-performance electrocatalysts for av ariety of applications.

Tailoring supports for enhancing the electrocatalytic hydrogen evolution performance of platinum species: a review

“…11a, a simple template-driven methodology was employed to synthesize ultrafine Pt NPs onto Co 3 O 4 NSs-assembled microflowers. 83 The Pt/Co 3 O 4 microflowers were produced using prefabricated PtCo-based Hofmann coordination polymers as reactive templates, resulting in a hierarchical architecture with well-dispersed Pt NPs, abundant metal/oxide heterointerfaces, and an open configuration (Fig. 11b–f).…”

Facile Synthesis of MoP-RuP2 with Abundant Interfaces to Boost Hydrogen Evolution Reactions in Alkaline Media

“…Thus, it is of importance to develop electrocatalysts with advantageous catalytic performance for HERs [ 15 , 16 , 17 , 18 , 19 , 20 , 21 ]. At present, Pt-based nanomaterials are still the state-of-the-art electrocatalysts for HERs due to having the lowest overpotential and the smallest Tafel slope [ 22 , 23 , 24 ]. Unsatisfactorily, the scarcity and exorbitant price severely impede their widespread practical applications.…”

Low-loaded Ru on hollow SnO2 for enhanced electrocatalytic hydrogen evolution

“…[9][10][11][12] The Volmer step comprises H 2 O " H ad + OH ad , OH ad + e À " OH À , where the dissociation of water and strong adsorption of OH ad to the active sites are considered the pivotal step limiting the rate of the HER. [13][14][15] Therefore, the fabrication of electrocatalysts with highly effective active sites for the HER is important for expediting water splitting.…”