Iron phosphide nanoparticles as an efficient electrocatalyst for the OER in alkaline solution

Masud, Jahangir; Umapathi, Siddesh; Ashokaan, N.; Nath, Manashi

doi:10.1039/c6ta04025j

Cited by 131 publications

(70 citation statements)

References 25 publications

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“…Thus, a best‐performed OER electrode with an overpotential of 300 mV at 10 mA/cm 2 in 1 M KOH is produced in this study. It is worth pointing out that this value is comparable to those for some reported OER electrocatalysts such as Fe–Ni hydroxide (320 mV), FeP nanoparticles (320 mV), Ni–Co nanowires (302 mV), Ni–P nanoplates (300 mV), amorphous CoSe film (292 mV), CoP/Ti mesh (310 mV) and NiS film (320 mV) under similar experimental conditions (1 M NaOH or 1 M KOH).…”

Section: Figuresupporting

confidence: 83%

In Situ Growth of Fe(Ni)OOH Catalyst on Stainless Steel for Water Oxidation

et al. 2017

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Stainless steel contains the elements Fe, Ni, Cr and Mn, which are known as active centers of oxygen evolution reaction (OER) catalysts. The high conductivity of stainless steel also makes it an ideal substrate for OER. These facts imply that stainless steel should be a suitable candidate as an OER electrode. Here, we report a simple solution treatment approach that enables stainless steel to be an efficient and stable OER electrode. It was found that a uniform brown film with highly rippled sheet structure could be in situ grown on stainless steel at room temperature by immersing it in an alkaline oxidant solution containing NaOH and (NH4)2S2O8. The composition of the brown film was found to include Fe(Ni)OOH by Raman and X‐ray photoelectron spectroscopy (XPS) analyses. In 1 M KOH electrolyte, the prepared OER electrode exhibited good electrocatalytic performance with a relatively low overpotential of 300 mV at a benchmark current density of 10 mA/cm2 and a small Tafel slope of 34 mV/decade. Moreover, this OER electrode showed excellent long‐term stability. This work highlights the possibility of potentially converting accessible materials into useful catalysts through simple chemical treatments.

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Section: Figuresupporting

confidence: 83%

In Situ Growth of Fe(Ni)OOH Catalyst on Stainless Steel for Water Oxidation

et al. 2017

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“…As previously mentioned, foam‐based metal phosphide catalysts, in which the foams serve as both metal source and growth substrate, have also been intensively investigated due to the ultra‐high HER and good OER,,, activity of metal phosphides along with the suitable in situ growth conditions provided by the metal foams. Shalom and co‐workers reported the synthesis of 3 D hierarchical highly ordered Ni 5 P 4 nanosheet films directly on a Ni foil and Ni foam by the simple heating Ni foil and Ni foam with red phosphorus under an inert atmosphere .…”

Section: Water Splittingmentioning

confidence: 99%

Design and Application of Foams for Electrocatalysis

et al. 2017

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Developing low cost and efficient anode and cathode materials toward electrocatalysis are regarded as one of the most desirable yet challenging research directions, which are intimately related to the pressing energy, environmental and human health issues. Currently, 3 D foam (such as Ni foam, Cu foam, and graphene foam) based heterogeneous catalysts have been intensively explored for actively catalyzing the electrode reactions. Their inherent characteristics of stereo‐network structure, high specific area and large pore volume not only provide better mass transport of reactants to electrode surfaces, but also pave 3 D electron transport pathways. Herein, recent significant progress and rational design of foam‐based electrocatalysts are reviewed. In addition, some insights into current challenges and future directions of foams for efficient electrocatalysis are proposed and discussed.

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“…In particular, the sample 0.75‐NC−Fe x P exhibited the highest catalytic activity and the lowest overpotential of 193 mV was obtained. This value is much lower than most active phosphide‐based catalysts as reported, including FeP‐rGO@Au (260 mV), NiP/NM (229 mV), Co phosphide/Co phosphate (380 mV), FeP NAs/CC (218 mV), and some other non‐precious metal based catalysts as listed in Table S1 (SI).…”

Section: Resultsmentioning

confidence: 67%

Porous Nitrogen Self‐Doped Carbon Wrapped Iron Phosphide Hollow Spheres as Efficient Bifunctional Electrocatalysts for Water Splitting

et al. 2019

ChemElectroChem

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In this work, a series of hybrid materials of N‐self‐doped carbon wrapped Fe2P/FeP hollow spheres were prepared by using a two‐step thermal conversion of precursors derived from the in situ coating of polyaniline on commercial Prussian blue. The precursors were pyrolyzed in N2 to form the N‐doped carbon coating on carbon‐iron materials; this was followed by subsequent phosphorization using NaH2PO2 as a phosphorus source, yielding the hybrid materials of N‐doped carbon wrapped Fe2P/FeP hollow spheres. The resulting hybrid materials showed high Brunauer‐Emmett‐Teller surface areas, pore volumes, and nitrogen contents, which were, more than 80 % pyridinic‐N. The hybrid materials were evaluated as electrocatalysts for the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) in 1.0 M KOH, and they have exhibited excellent electrocatalytic activities in the two reactions. In the case of the optimum sample, the 0.75‐NC−FexP catalyst, a low overpotential/Tafel slope of 193 mV/58 mV ⋅ dec−1 for HER and 302 mV/42 mV ⋅ dec−1 for OER were obtained. More importantly, the catalyst showed high catalytic activity for overall water splitting and only 1.63 V of cell voltage was needed to reach 10 mA/cm2 in a two‐electrode electrolyzer. The catalyst also exhibited robust long‐term durability and only a 16.0 % decrease in current density was observed after a 10 h chronoamperometric testing at 1.63 V. The results suggest that the sample is a promising alternative non‐precious‐metal catalyst for overall water splitting.

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Iron phosphide nanoparticles as an efficient electrocatalyst for the OER in alkaline solution

Abstract: Ultrasmall FeP nanoparticles have been reported as an efficient oxygen evolution electrocatalyst in alkaline medium with low onset potential for oxygen evolution and require low overpotential to reach 10 mA cm−2 exchange current density.

Cited by 131 publications

References 25 publications

In Situ Growth of Fe(Ni)OOH Catalyst on Stainless Steel for Water Oxidation

In Situ Growth of Fe(Ni)OOH Catalyst on Stainless Steel for Water Oxidation

Design and Application of Foams for Electrocatalysis

Porous Nitrogen Self‐Doped Carbon Wrapped Iron Phosphide Hollow Spheres as Efficient Bifunctional Electrocatalysts for Water Splitting

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