Highly Active Fe/Pt Single-Atom Bifunctional Electrocatalysts on Biomass-Derived Carbon

Abstract

The highly active bimetallic single-atom electrocatalysts are desirable for the oxygen reduction reaction (ORR) and hydrogen evolution reaction (HER) but remain challenging. Herein, Fe/Pt single-atom bifunctional electrocatalysts (Fe1Pt1/NC) are initially fabricated by nitrogen doping during the pyrolysis of porphyra and adsorbed urea at high temperature with subsequent nitrogen anchoring of Pt4+ in aqueous solution with the as-synthesized nitrogen-doped carbon. The as-synthesized Fe1Pt1/NC electrocatalysts have been intensively characterized by HAADF-STEM, XAFS, HRTEM, XRD, and Raman analysis. Particularly, the Fe1Pt1/NC presents excellent electrocatalytic activity toward HER, with relatively low overpotential of 27 mV at 10 mA cm–2 and small Tafel slopes of 28 mV dec–1. Furthermore, the Fe1Pt1/NC electrocatalyst possesses superior ORR activity with an onset potential of 1.04 V and half-wave potential of 0.91 V. This work provides a feasible way to synthesize electrocatalysts with abundant single-atom sites using renewable biomass as a precursor.

An Adjacent Atomic Platinum Site Enables Single‐Atom Iron with High Oxygen Reduction Reaction Performance

“…[8,9] Inspired by nature,c onstructing adjacent metal centers to regulate the electronic localization of Fe-N 4 should be apromising strategy to promote the ORR performance. [10] Although different Ni-N 4 , [2a, 11] Mn-N 4 [10b] and Pt-N 4 [12] moieties have proved to promote the ORR activity of Fe-N 4 moieties,t he general principle that governs the structuredependent catalytic properties of Fe-N 4 /M-N 4 have rarely been elucidated. It was revealed that Pt-N 4 moiety was insufficiently active for ORR, [3e,13] however, they are endowed with vacant 5d orbitals,p roviding the possibility of facilitating the adsorption of O 2 and O-O breakage on the Fe-N 4 active site.…”

Heterostructured VN/Mo2C Nanoparticles as Highly Efficient pH-Universal Electrocatalysts toward the Hydrogen Evolution Reaction

“…3−6 Although platinum family metals exhibited excellent catalytic performance, the high price and low abundance of the Pt-based catalysts largely impeded its scalable practical applications. 7,8 For this reason, researchers have explored cost-effective, abundant, and stable catalysts in order to replace noble metals catalysts.…”

“…With depleting fossil energy and aggravating environmental concerns, a lot of efforts have been taken to develop renewable and friendly energy conversion and storage systems. Recently, hydrogen, deemed as a green, secure, sustainable, and abundant resource, has drawn more attention of numerous scholars and researchers. , Among many sorts of hydrogen production techniques, water electrolysis is regarded as one of the most promising and frugal ways due to its energy conservation and emission reduction. − Although platinum family metals exhibited excellent catalytic performance, the high price and low abundance of the Pt-based catalysts largely impeded its scalable practical applications. , For this reason, researchers have explored cost-effective, abundant, and stable catalysts in order to replace noble metals catalysts.…”

An Adjacent Atomic Platinum Site Enables Single‐Atom Iron with High Oxygen Reduction Reaction Performance

“…Inspired by nature, constructing adjacent metal centers to regulate the electronic localization of Fe‐N 4 should be a promising strategy to promote the ORR performance [10] . Although different Ni‐N 4 , [2a, 11] Mn‐N 4 [10b] and Pt‐N 4 [12] moieties have proved to promote the ORR activity of Fe‐N 4 moieties, the general principle that governs the structure‐dependent catalytic properties of Fe‐N 4 /M‐N 4 have rarely been elucidated. It was revealed that Pt‐N 4 moiety was insufficiently active for ORR, [3e, 13] however, they are endowed with vacant 5 d orbitals, providing the possibility of facilitating the adsorption of O 2 and O‐O breakage on the Fe‐N 4 active site [14]…”