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Transforming Ni‐Coagulated Polyferriertic Sulfate Sludge into Porous Heteroatom‐Doped Carbon‐Supported Transition Metal Phosphide: An Efficient Catalyst for Oxygen Evolution Reaction
Author(s) -
Li Ge,
Zhu Tonghe,
Ye Yali,
Liang Sheng,
Duan Weijian,
Hong Wei,
Feng Chunhua
Publication year - 2020
Publication title -
energy technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.91
H-Index - 44
eISSN - 2194-4296
pISSN - 2194-4288
DOI - 10.1002/ente.201900995
Subject(s) - phosphide , heteroatom , overpotential , tafel equation , catalysis , materials science , chemical engineering , inorganic chemistry , carbon fibers , oxygen evolution , shewanella oneidensis , transition metal , mesoporous material , chemistry , organic chemistry , electrochemistry , bacteria , composite material , geology , ring (chemistry) , electrode , composite number , engineering , paleontology
The transformation of sludge waste from wastewater treatment plants into functional materials is an attractive prospect. Herein, the successful synthesis of mesoporous heteroatom‐doped carbon‐supported NiFe phosphide (FeNi 2 P@HDC) from Ni‐coagulated iron sludge by forming a biogenic precursor via incubation of the sludge with Shewanella oneidensis MR‐1, followed by a simple pyrolysis process, is reported. The incubation results in the formation of a solid chemical bonding between bacteria and the surface of the newly formed mineral, which is beneficial for producing a desirable microstructure and chemical composition. The as‐synthesized FeNi 2 P@HDC shows a superior oxygen evolution reaction (OER) performance, evident from the data, including a low overpotential of 280 mV to reach a current density of 10 mA cm −2 and a small Tafel slope of 56 mV dec −1 under alkaline conditions, which is comparable with that of the majority of the reported Ni and/or Fe phosphide catalysts in the literature and better than the state‐of‐the‐art RuO 2 catalyst. Such a good performance seems to be the result of the synergistic effect of the intrinsic activity of FeNi 2 P nanoparticles and the strong interaction between FeNi 2 P and heteroatom‐doped graphene‐like carbon support.