Direct electro-phosphorization of nickel and cobalt films in hypophosphite solution for efficient hydrogen evolution

Qian, Qingyi; Wang, Fan; Zhang, Xingkai; Zhao, Qiuping

doi:10.1016/j.inoche.2021.108555

Cited by 13 publications

(3 citation statements)

References 37 publications

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“…Generally, the PO 4 3– group peak will be observed around 133.5 to 134 eV . However, in the present materials, the peak shifted to lower binding energies due to the strong interactions of electropositive Co, Mo, and Ni metals with phosphate groups and charge transfer from the metal to phosphate groups . The peak shifts in the core-level spectra of metals also support this fact.…”

Section: Resultssupporting

confidence: 63%

In Situ Surface Restructuring of Amorphous Ni-Doped CoMo Phosphate-Based Three-Dimensional Networked Nanosheets: Highly Efficient and Durable Electrocatalyst for Overall Alkaline Water Splitting

Viswanathan

Kim

2023

ACS Appl. Mater. Interfaces

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Developing cost-efficient bifunctional electrocatalysts with high efficiency and durability for the production of green hydrogen and oxygen is a demanding and challenging research area. Due to their high earth abundance, transition metal-based electrocatalysts are alternatives to noble metal-based water splitting electrocatalysts. Herein, binder-free three-dimensional (3D) networked nanosheets of Ni-doped CoMo ternary phosphate (Pi) were prepared using a facile electrochemical synthetic strategy on flexible carbon cloth without any high-temperature heat treatment or complicated electrode fabrication. The optimized CoMoNiPi electrocatalyst delivers admirable hydrogen (η10 = 96 mV) and oxygen (η10 = 272 mV) evolution performances in 1.0 M KOH electrolyte. For overall water splitting in a two-electrode system, the present catalyst demands only 1.59 and 1.90 V to reach current densities of 10 and 100 mA/cm2, respectively, which is lower than that of the Pt/C||RuO2 couple (1.61 V @ 10 mA/cm2, 2 V > @ 100 mA/cm2) and many other catalysts reported previously. Furthermore, the present catalyst delivers excellent long-term stability in a two-electrode system continuously over 100 h at a high current density of 100 mA/cm2, exhibiting nearly 100% faradic efficiency. The unique 3D amorphous structure with high porosity, a high active surface area, and lower charge transfer resistance provides excellent overall water splitting. Notably, the amorphous structure of the present catalyst favors the in situ surface reconstruction during electrolysis and generates very stable surface-active sites capable of long-term performance. The present work provides a route for the preparation of multimetallic-Pi nanostructures for various electrode applications that are easy to prepare and have superior activity, high stability, and low cost.

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Section: Resultssupporting

confidence: 63%

In Situ Surface Restructuring of Amorphous Ni-Doped CoMo Phosphate-Based Three-Dimensional Networked Nanosheets: Highly Efficient and Durable Electrocatalyst for Overall Alkaline Water Splitting

Viswanathan

Kim

2023

ACS Appl. Mater. Interfaces

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“…To put it in a simple way, hypophosphite, phosphite, and phosphate anions can undergo disproportionation during anodic polarization at the electrode/electrolyte interface under the action of electric current. [50] This generates P, which can diffuse into a metallic Cu lattice during polarization in Na 2 HPO 3 and Na 3 PO 4 solutions. The diffusion of P into the Cu lattice explains the appearance of the XP signal associated with metallic P (Figure S7b,c).…”

Section: Surface Characterizationmentioning

confidence: 99%

Tailoring Cu Electrodes for Enhanced CO₂ Electroreduction through Plasma Electrolysis in Non‐Conventional Phosphorus‐Oxoanion‐Based Electrolytes

et al. 2023

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This study presents a green and facile technique for producing micro/nano‐structured and porous Cu electrodes via in‐liquid plasma electrolysis using phosphorous‐oxoanion‐based electrolytes. The Cu electrodes exhibit unique surface structures, including octahedral nanocrystals besides nanoporous and microporous structures, depending on the employed electrolyte. The incorporation of P‐atoms into the Cu surfaces is observed. The resulting Cu electrodes have increased roughness, leading to higher current densities for CO2 electroreduction reaction. The selectivity of the modified Cu electrodes towards C2 products is highest for the Cu electrodes treated in Na2HPO3 and Na3PO4 electrolytes, while those treated in Na2H2PO2 produce the most H2. The Cu electrode treated in Na3PO4 produces ethylene (23%) at –1.1 V vs. RHE, and a comparable amount of acetaldehyde (15%) that is typically observed for Cu(110) single crystals. The enhanced selectivity is attributed to several factors, including the surface morphology, the incorporation of phosphorus into the Cu structure, and the formation of Cu(110) facets. Our results not only advance our understanding of the influence of the electrolyte’s nature on the plasma electrolysis of Cu electrodes, but also demonstrates that in‐liquid plasma treatment and phosphorous‐doping of Cu surfaces hold promise for the development of efficient Cu electrocatalysts for sustainable CO2 conversion.

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“…Electrodes with high catalytic activity and low cost are needed to make hydrogen gas production by the electrolysis of water more appealing with lower costs. To meet the need, specific electrodes are recommended such as transition metal modified foam, felt, and nano‐sheet electrodes 24‐38 . These have a great advantage with a larger surface area and specified active centers on substrates/precursors.…”

Section: Introductionmentioning

confidence: 99%

Production of NF / NiCo /Ag catalyst for hydrogen generation in alkaline medium

Mert

2021

Intl J of Energy Research

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Summary The nickel foam (NF) precursors were doped with nickel, cobalt particles with various chemical compositions; the most convenient one was decorated with silver nano‐domes and investigated for hydrogen production efficiency (HPE) in 1 M KOH. The X‐ray diffraction, field emission scanning electron microscopy, and energy‐dispersive X‐ray techniques were used to characterize the catalysts. Linear sweep voltammetry, cyclic voltammetry, Tafel polarization measurements, electrochemical impedance spectroscopy, and chronoamperometry were used to determine the electrochemical efficiency. The rough structured Ni‐ and Co‐deposited NF significantly increased the HPE achieved with silver nano‐domes particles decoration (NF/NiCo‐2/Ag). The results showed that NF/NiCo‐2/Ag was the most efficient catalyst, as it has lower hydrogen overpotential and a higher HPE, which was detected in polarization curves, as well as being stable during the 1 × 104 s electrolysis period and having a good response during electrochemical analysis. The produced hydrogen gas volume was 108.1 mL by using NF/NiCo‐2/Ag, at the end of 30‐minute electrolysis in 1 M KOH.

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Direct electro-phosphorization of nickel and cobalt films in hypophosphite solution for efficient hydrogen evolution

Cited by 13 publications

References 37 publications

In Situ Surface Restructuring of Amorphous Ni-Doped CoMo Phosphate-Based Three-Dimensional Networked Nanosheets: Highly Efficient and Durable Electrocatalyst for Overall Alkaline Water Splitting

In Situ Surface Restructuring of Amorphous Ni-Doped CoMo Phosphate-Based Three-Dimensional Networked Nanosheets: Highly Efficient and Durable Electrocatalyst for Overall Alkaline Water Splitting

Tailoring Cu Electrodes for Enhanced CO₂ Electroreduction through Plasma Electrolysis in Non‐Conventional Phosphorus‐Oxoanion‐Based Electrolytes

Production of NF / NiCo /Ag catalyst for hydrogen generation in alkaline medium

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Direct electro-phosphorization of nickel and cobalt films in hypophosphite solution for efficient hydrogen evolution

Cited by 13 publications

References 37 publications

In Situ Surface Restructuring of Amorphous Ni-Doped CoMo Phosphate-Based Three-Dimensional Networked Nanosheets: Highly Efficient and Durable Electrocatalyst for Overall Alkaline Water Splitting

In Situ Surface Restructuring of Amorphous Ni-Doped CoMo Phosphate-Based Three-Dimensional Networked Nanosheets: Highly Efficient and Durable Electrocatalyst for Overall Alkaline Water Splitting

Tailoring Cu Electrodes for Enhanced CO2 Electroreduction through Plasma Electrolysis in Non‐Conventional Phosphorus‐Oxoanion‐Based Electrolytes

Production of NF / NiCo /Ag catalyst for hydrogen generation in alkaline medium

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Tailoring Cu Electrodes for Enhanced CO₂ Electroreduction through Plasma Electrolysis in Non‐Conventional Phosphorus‐Oxoanion‐Based Electrolytes