Uncovering the Nature of Active Species of Nickel Phosphide Catalysts in High-Performance Electrochemical Overall Water Splitting

Menezes, Prashanth W.; Indra, Arindam; Das, Chittaranjan; Walter, Carsten; Göbel, Caren; Gutkin, Vitaly; Schmeiβer, D.; Drieß, Matthias

doi:10.1021/acscatal.6b02666

Cited by 376 publications

(275 citation statements)

References 57 publications

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“…[28] Although a + 2oxidation state of Ni was revealed by XPS of recovered 2I (Figure S18), in situ electron paramagnetic resonance (EPR) studies detected Ni 0 as the active catalyst and oxidation of Ni 0 was transpired by the surface passivation of the catalyst in air (see below). PXRD, TEM, EDX, and XPS studies of recovered 2I after 6days of continuous photocatalytic H 2 evolution revealed the formation of amorphous Ni(OH) 2 on sg-CN (Figure S15-S18).…”

Section: Angewandte Chemiementioning

confidence: 99%

Boosting Visible‐Light‐Driven Photocatalytic Hydrogen Evolution with an Integrated Nickel Phosphide–Carbon Nitride System

et al. 2017

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Solar light harvesting by photocatalytic H evolution from water could solve the problem of greenhouse gas emission from fossil fuels with alternative clean energy. However, the development of more efficient and robust catalytic systems remains a great challenge for the technological use on a large scale. Here we report the synthesis of a sol-gel prepared mesoporous graphitic carbon nitride (sg-CN) combined with nickel phosphide (Ni P) which acts as a superior co-catalyst for efficient photocatalytic H evolution by visible light. This integrated system shows a much higher catalytic activity than the physical mixture of Ni P and sg-CN or metallic nickel on sg-CN under similar conditions. Time-resolved photoluminescence and electron paramagnetic resonance (EPR) spectroscopic studies revealed that the enhanced carrier transfer at the Ni P-sg-CN heterojunction is the prime source for improved activity.

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Section: Angewandte Chemiementioning

confidence: 99%

Boosting Visible‐Light‐Driven Photocatalytic Hydrogen Evolution with an Integrated Nickel Phosphide–Carbon Nitride System

et al. 2017

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“…Highly efficient water electrolysis generally requires high-performance electrocatalysts with low overpotential, fast kinetics, and high stability. [9][10][11] Recently, transition-metal hydroxides, [7,12] phosphides, [8,[13][14][15][16] nitrides, [17,18] and chalcogenides [19][20][21][22] have been investigated as promising candidates for bifunctional electrocatalysts. [7,8] The search for earth-abundant, lowcost HER and OER electrocatalysts that are robust, have high activity and stability has triggered numerous efforts to replace noble metal-based materials.…”

Section: Introductionmentioning

confidence: 99%

3D Architectures of Quaternary Co‐Ni‐S‐P/Graphene Hybrids as Highly Active and Stable Bifunctional Electrocatalysts for Overall Water Splitting

Song

Yoon

et al. 2018

Advanced Energy Materials

113

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Developing low-cost, highly active, and stable bifunctional electrocatalysts is a challenging issue in electrochemical water electrolysis. Building on 3D architectured electrocatalysts through structural and compositional engineering is an effective strategy to enhance catalytic activities as well as stability and durability. Herein, 3D architectures of quaternary Co-Ni-S-P compounds coupled with graphene ((Co 1−x Ni x )(S 1−y P y ) 2 /G) electrocatalysts are proposed, in which nanosheets are self-assembled to form 3D architectures with round and flat doughnut-like shapes, toward overall water splitting. Benefiting from the 3D architectures and Ni, P substitution, (Co 1−x Ni x )(S 1−y P y ) 2 /G exhibits superior electrocatalytic activities with low overpotentials of 117 and 285 mV at 10 mA cm −2 and Tafel slopes of 85 and 105 mV dec −1 for hydrogen and oxygen evolution reactions, respectively, in alkaline media. In addition, minimal increases in overpotential are observed, even after the 10 000th voltammetric cycle and continuous chronopotentiometric testing over 50-100 h, confirming the high stability and durability of (Co 1−x Ni x )(S 1−y P y ) 2 /G. When used as both cathode and anode, (Co 1−x Ni x )(S 1−y P y ) 2 /G achieves excellent overall water splitting performance with a cell potential as low as 1.65 V, reaching a current density of 10 mA cm −2 with no obvious decay after 50 h, demonstrating that (Co 1−x Ni x )(S 1−y P y ) 2 /G is an efficient bifunctional electrocatalyst for overall water splitting.

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“…‐ Especially, as a typical representative of transition metal phosphides, Ni 2 P has been extensively investigated due to its strong catalytic activities . Driess and co‐workers studied the near‐surface active species of nickel phosphides, and demonstrated that the materials can be used as high‐performance electrocatalysts for OER and HER . Hu and co‐workers reported a bifunctional catalyst of Ni 2 P nanoparticles with excellent electrochemical activity for OER and HER .…”

Section: Introductionmentioning

confidence: 99%

Vanadium Doped Nickel Phosphide Nanosheets Self‐Assembled Microspheres as a High‐Efficiency Oxygen Evolution Catalyst

Jiang

Miao

et al. 2019

ChemCatChem

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Recently, much attention has been paid to the low-cost, highefficiency and stable non-precious metal catalysts for oxygen evolution reaction (OER). In this work, vanadium (V)-doped nickel phosphide (Ni 2 P) nanosheets self-assembled microspheres supported on nickel foam (Ni 1 V 1 P NSs/NF) were synthesized as a novel OER catalyst by combined processes of hydrothermal method and low-temperature phosphorization. The synthesized Ni 1 V 1 P NSs/NF material shows excellent catalytic activity due to its interconnected three-dimensional (3D) structure and synergistic effect between nickel and vanadium.When used as a catalyst electrode for OER, the synthesized Ni 1 V 1 P NSs/NF exhibits excellent electrocatalytic activity, reaching a current density of 50 mA cm À 2 at the low overpotential of 250 mV in 1.0 M KOH. This material also shows superior electrochemical stability with negligible decay of the activity after continual measurement for 15 h at 50 and 100 mA cm À 2 in 1.0 M KOH, respectively. This work provides a valuable method to synthesize efficient OER catalysts by doping valence-variable metal ions and designing distinctive 3D structure.

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Uncovering the Nature of Active Species of Nickel Phosphide Catalysts in High-Performance Electrochemical Overall Water Splitting

Cited by 376 publications

References 57 publications

Boosting Visible‐Light‐Driven Photocatalytic Hydrogen Evolution with an Integrated Nickel Phosphide–Carbon Nitride System

Boosting Visible‐Light‐Driven Photocatalytic Hydrogen Evolution with an Integrated Nickel Phosphide–Carbon Nitride System

3D Architectures of Quaternary Co‐Ni‐S‐P/Graphene Hybrids as Highly Active and Stable Bifunctional Electrocatalysts for Overall Water Splitting

Vanadium Doped Nickel Phosphide Nanosheets Self‐Assembled Microspheres as a High‐Efficiency Oxygen Evolution Catalyst

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