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Single‐Atom to Single‐Atom Grafting of Pt 1 onto FeN 4 Center: Pt 1 @FeNC Multifunctional Electrocatalyst with Significantly Enhanced Properties
Author(s) -
Zeng Xiaojun,
Shui Jianglan,
Liu Xiaofang,
Liu Qingtao,
Li Yongcheng,
Shang Jiaxiang,
Zheng Lirong,
Yu Ronghai
Publication year - 2018
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.201701345
Subject(s) - moiety , catalysis , materials science , electrocatalyst , active center , metal , proton exchange membrane fuel cell , atom (system on chip) , density functional theory , inorganic chemistry , photochemistry , chemistry , stereochemistry , electrochemistry , computational chemistry , electrode , organic chemistry , computer science , embedded system , metallurgy
Nonprecious metal catalysts (NPMCs) FeNC are promising alternatives to noble metal Pt as the oxygen reduction reaction (ORR) catalysts for proton‐exchange‐membrane fuel cells. Herein, a new modulation strategy is reported to the active moiety FeN 4 via a precise “single‐atom to single‐atom” grafting of a Pt atom onto the Fe center through a bridging oxygen molecule, creating a new active moiety of Pt 1 O 2 Fe 1 N 4 . The modulated FeNC exhibits remarkably improved ORR stabilities in acidic media. Moreover, it shows unexpectedly high catalytic activities toward oxygen evolution reaction (OER) and hydrogen evolution reaction (HER), with overpotentials of 310 mV for OER in alkaline solution and 60 mV for HER in acidic media at a current density of 10 mA cm −2 , outperforming the benchmark RuO 2 and comparable with Pt/C(20%), respectively. The enhanced multifunctional electrocatalytic properties are associated with the newly constructed active moiety Pt 1 O 2 Fe 1 N 4 , which protects Fe sites from harmful species. Density functional theory calculations reveal the synergy in the new active moiety, which promotes the proton adsorption and reduction kinetics. In addition, the grafted Pt 1 O 2 dangling bonds may boost the OER activity. This study paves a new way to improve and extend NPMCs electrocatalytic properties through a precisely single‐atom to single‐atom grafting strategy.