Facile synthesis of nanoporous Ni–Fe–P bifunctional catalysts with high performance for overall water splitting

Wang, Kaihang; Sun, Kaili; Yu, Tianpeng; Liu, Xin; Wang, Guixue; Jiang, Luhua; Xie, Guangwen

doi:10.1039/c8ta10856k

Cited by 87 publications

(20 citation statements)

References 42 publications

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“…To avoid the oxidation-peak effect and determine the overpotential of the Ni 2 P-Fe 2 P/NF electrocatalyst at a small current density, CV curves were obtained using the same scan rate (Figure S13a, Supporting Information). The optimized Ni 2 P-Fe 2 P/NF sample needs an overpotential of only 218 mV to attain a current density of 10 mA cm −2 (Figure S13b,c, Supporting Information), which is superior to many other 3b), including (Co 0.52 Fe 0.48 ) 2 P ribbon (270 mV), [38] NiCoP/NF (280 mV), [27a] NiCoP/Cu wire (220 mV), [27b] Ni-Fe-P/NF (229 mV), [39] N-NiCoP/Ni-Co foam (225 mV), [40] FeP 2 /NF (240 mV), [37] NiFeRu LDH/NF (225 mV), [5a] and NiFe LDH@NiCoP/NF (220 mV). [41] To further assess the intrinsic catalytic activity of these electrocatalysts, their OER catalytic kinetics were studied using the corresponding Tafel 3c, the Tafel slope value of Ni 2 P-Fe 2 P/NF is as low as 58 mV dec −1 , which is much lower than that of Ni 2 P-Ni 5 P 4 /NF (83 mV dec −1 ), showing that the introduction of Fe results in a higher transfer coefficient and enhanced electrocatalytic kinetics.…”

Section: (3 Of 12)mentioning

confidence: 94%

Heterogeneous Bimetallic Phosphide Ni₂P‐Fe₂P as an Efficient Bifunctional Catalyst for Water/Seawater Splitting

Luo

Zhang

et al. 2020

Adv Funct Materials

469

418

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Developing high‐performance and cost‐effective bifunctional electrocatalysts for large‐scale water electrolysis is desirable but remains a significant challenge. Most existing nano‐ and micro‐structured electrocatalysts require complex synthetic procedures, making scale‐up highly challenging. Here, a heterogeneous Ni2P‐Fe2P microsheet is synthesized by directly soaking Ni foam in hydrochloric acid and an iron nitrate solution, followed by phosphidation. Benefiting from high intrinsic activity, abundant active sites, and a superior transfer coefficient, this self‐supported Ni2P‐Fe2P electrocatalyst shows superb catalytic activity toward overall water splitting, requiring low voltages of 1.682 and 1.865 V to attain current densities of 100 and 500 mA cm−2 in 1 m KOH, respectively. Such catalytic performance is superior to the benchmark IrO2 || Pt/C pair and also places this electrocatalyst among the best bifunctional catalysts reported thus far. Furthermore, its enhanced corrosion resistance and hydrophilic surface make it suitable for seawater splitting. It is able to achieve current densities of 100 and 500 mA cm−2 in 1 m KOH seawater at voltages of 1.811 and 2.004 V, respectively, which, together with its robust durability, demonstrates its great potential for realistic seawater electrolysis. This work presents a general and economic approach toward the fabrication of heterogeneous metallic phosphide catalysts for water/seawater electrocatalysis.

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Section: (3 Of 12)mentioning

confidence: 94%

Heterogeneous Bimetallic Phosphide Ni₂P‐Fe₂P as an Efficient Bifunctional Catalyst for Water/Seawater Splitting

Luo

Zhang

et al. 2020

Adv Funct Materials

469

418

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“…For example, Chen and co‐workers [ 126 ] developed an advanced approach by integrating rapid solidification and dealloying to prepare freestanding bicontinuous porous Co 2 P, which shows wonderful HER activity in both acidic and alkaline aqueous solution. Xie and co‐workers [ 127 ] made it to fabricate a bifunctional catalyst Ni‐Fe‐P/NF with the nanoporous and amorphous nature for overall water splitting by electroless deposition combined with fast dealloying.…”

Section: The Exceptionally Advantaged Nature Of Amorphous Catalysts Tmentioning

confidence: 99%

High Density and Unit Activity Integrated in Amorphous Catalysts for Electrochemical Water Splitting

et al. 2020

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Electrochemical water splitting is regarded as a most effective hydrogen production technique. In fact, quite a few exceptional electrocatalysts, processes, and even large‐scale demonstrations have been developed. In particular, some amorphous catalysts have become well‐known for their extraordinary performance on account of their disordered structure, numerous, uniformly distributed active sites with high unit activity and better stability that outshine their single‐crystalline counterparts. Herein, a review of recent research advances of amorphous catalysts used in electrocatalytic water splitting are provided, including both the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER). Particularly, the scaled‐up application of amorphous catalysts with multifarious compositions and diverse heterostructures in electrolyzing water and the reason why amorphous catalysts exhibit excellent catalytic performance are emphasized on. In addition, the mechanism of water electrolysis and the evaluation criteria of catalytic properties are analyzed in detail. Finally, the broader development outlook of amorphous catalysts is discussed.

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“…Concerning the pattern obtained for the Ni-P 24 sample (red pattern), in this case, a diffuse scattering peak is clearly observable around 44.6 • . The widening of this peak, commonly observed in electroless-deposited Ni-P alloys, is a hint that P has entered the face-centered cubic nickel lattice and clearly indicates that the as-deposited Ni-P is amorphous [17,[36][37][38].…”

Section: Resultsmentioning

confidence: 79%

“…Among the multitude of transition metals which have been explored as OER electrocatalysts, Ni-based catalysts have been widely demonstrated to have noteworthy catalytic properties [13][14][15][16]. Several research studies have proved that alloying Ni with P provides a beneficial effect for the OER process [17][18][19][20]. The improved catalytic activity of transition metal phosphide catalysts arises from the partially charged nature of the Ni (δ + ) and P (δ − ) atoms in the Ni-P alloy.…”

Section: Introductionmentioning

confidence: 99%

Optimization of Oxygen Evolution Reaction with Electroless Deposited Ni–P Catalytic Nanocoating

et al. 2021

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The low efficiency of water electrolysis mostly arises from the thermodynamic uphill oxygen evolution reaction. The efficiency can be greatly improved by rationally designing low-cost and efficient oxygen evolution anode materials. Herein, we report the synthesis of Ni–P alloys adopting a facile electroless plating method under mild conditions on nickel substrates. The relationship between the Ni–P properties and catalytic activity allowed us to define the best conditions for the electroless synthesis of highperformance Ni–P catalysts. Indeed, the electrochemical investigations indicated an increased catalytic response by reducing the thickness and Ni/P ratio in the alloy. Furthermore, the Ni–P catalysts with optimized size and composition deposited on Ni foam exposed more active sites for the oxygen evolution reaction, yielding a current density of 10 mA cm−2 at an overpotential as low as 335 mV, exhibiting charge transfer resistances of only a few ohms and a remarkable turnover frequency (TOF) value of 0.62 s−1 at 350 mV. The present study provides an advancement in the control of the electroless synthetic approach for the design and large-scale application of high-performance metal phosphide catalysts for electrochemical water splitting.

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Facile synthesis of nanoporous Ni–Fe–P bifunctional catalysts with high performance for overall water splitting

Abstract: On the basis of the unique defects of amorphous metals, more defects are exposed as effective active sites by dealloying.

Cited by 87 publications

References 42 publications

Heterogeneous Bimetallic Phosphide Ni₂P‐Fe₂P as an Efficient Bifunctional Catalyst for Water/Seawater Splitting

Heterogeneous Bimetallic Phosphide Ni₂P‐Fe₂P as an Efficient Bifunctional Catalyst for Water/Seawater Splitting

High Density and Unit Activity Integrated in Amorphous Catalysts for Electrochemical Water Splitting

Optimization of Oxygen Evolution Reaction with Electroless Deposited Ni–P Catalytic Nanocoating

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Facile synthesis of nanoporous Ni–Fe–P bifunctional catalysts with high performance for overall water splitting

Abstract: On the basis of the unique defects of amorphous metals, more defects are exposed as effective active sites by dealloying.

Cited by 87 publications

References 42 publications

Heterogeneous Bimetallic Phosphide Ni2P‐Fe2P as an Efficient Bifunctional Catalyst for Water/Seawater Splitting

Heterogeneous Bimetallic Phosphide Ni2P‐Fe2P as an Efficient Bifunctional Catalyst for Water/Seawater Splitting

High Density and Unit Activity Integrated in Amorphous Catalysts for Electrochemical Water Splitting

Optimization of Oxygen Evolution Reaction with Electroless Deposited Ni–P Catalytic Nanocoating

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Heterogeneous Bimetallic Phosphide Ni₂P‐Fe₂P as an Efficient Bifunctional Catalyst for Water/Seawater Splitting

Heterogeneous Bimetallic Phosphide Ni₂P‐Fe₂P as an Efficient Bifunctional Catalyst for Water/Seawater Splitting