Nanoporous NiFeMoP alloy as a bifunctional catalyst for overall water splitting

Qian, Haixia; Li, Kaiyang; Mu, Xiaobo; Zou, Jizhao; Xie, Shenghui; Xiong, Xinbo; Zeng, Xierong

doi:10.1016/j.ijhydene.2020.04.103

Cited by 33 publications

(10 citation statements)

References 50 publications

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“…In contrast, two distinct broad Raman peaks are identified rather than narrow ones on the surface of the FN-Nb catalyst after the OER, indicating that part of the crystallization products occur on the amorphous matrix. We attribute the Raman bands at around 458 and 532 cm –1 mainly to the A 1g vibrations mode of the Ni–O band in the disordered Ni(OH) 2 phase. , The Raman band at around 458 cm –1 may be also assigned to the A 1g mode of the Co(OH) 2 phase . The poorly resolved shoulder at around 295 cm –1 is attributed to the E g mode of Ni(OH) 2 , further illustrating a lack of local crystallinity for this catalyst.…”

Section: Resultsmentioning

confidence: 73%

“…We attribute the Raman bands at around 458 and 532 cm −1 mainly to the A 1g vibrations mode of the Ni−O band in the disordered Ni(OH) 2 phase. 45,46 The Raman band at around 458 cm −1 may be also assigned to the A 1g mode of the Co(OH) 2 phase. 47 The poorly resolved shoulder at around 295 cm −1 is attributed to the E g mode of Ni(OH) 2 , further illustrating a lack of local crystallinity for this catalyst.…”

Section: Resultsmentioning

confidence: 99%

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Insight into the Catalytic Activity of Amorphous Multimetallic Catalysts under a Magnetic Field toward the Oxygen Evolution Reaction

Jiang

Chen

Zhu

et al. 2022

ACS Appl. Mater. Interfaces

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Slow kinetics in the oxygen evolution reaction (OER) remains a Gordian knot to develop an efficient and cost-effective electrocatalyst in electrochemical water splitting. In recent studies, either a synergistic effect on multimetallic catalysts or spin polarization in ferromagnetic materials is considered as a desirable way to improve water electrolysis. Herein, the OER performance of amorphous FeNiCo-based multimetallic catalysts with adjustable composition was investigated from the perspective of atomic structure. Mossbauer spectra results demonstrate that the OER activities exhibit a significant dependence on the local structure of catalysts in which a catalyst with a high content of Fe clusters of low coordination numbers tends to obtain higher activity. Furthermore, benefiting from the spin polarization of these ferromagnetic catalysts, the OER activity is notably enhanced in the presence of a magnetic field. In particular, overpotential reduction exceeding 20 mV (above 100 mA cm −2 ) in alkaline OER performance is observed for strong ferromagnetic catalysts in comparison with the weak ferromagnetic ones. An increment of 65.2% in turnover frequency is achieved for the catalyst with the strongest ferromagnetism. This magnetic enhancement strategy affords an effective way of improving the water oxidation performance on amorphous ferromagnetic catalysts.

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Section: Resultsmentioning

confidence: 73%

Section: Resultsmentioning

confidence: 99%

Insight into the Catalytic Activity of Amorphous Multimetallic Catalysts under a Magnetic Field toward the Oxygen Evolution Reaction

Jiang

Chen

Zhu

et al. 2022

ACS Appl. Mater. Interfaces

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“…Among transition metals, Mo has a higher impact on enhancing HER by tailoring the surface electronic structure of catalysts, while Fe in combination with NiP enhances OER due to the formation of oxygen-containing intermediates (*O, *OH, and *OOH). ,− The most common method for the synthesis of TMPs requires long reaction times and high temperatures. Moreover, TMPs have been synthesed using complex methods such as a gas–solid reaction, a solution-phase reaction, and two-step melt-spinning combined with chemical etching, − requiring phosphine (PH 3 ) gas and organic solvents, which are highly toxic and flammable. Thus, synthesis of TMP-based electrocatalysts using a relatively facile synthesis strategy with low-cost equipment and chemicals is a critical task.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Theoretical Insights into Transition-Metal (Mo, Fe) Codoping in a Bifunctional Nickel Phosphide Microsphere Catalyst for Enhanced Overall Water Splitting

Pawar

Lee

Babar

et al. 2021

ACS Appl. Energy Mater.

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The facile synthesis of efficient non-precious-metal-based bifunctional catalysts for overall water splitting is highly desirable from both industrial and environmental perspectives. This study reports the electrodeposition and characterization of a transition-metal (Mo, Fe)-codoped nickel phosphide (Ni3P:FeMo) bifunctional catalyst for enhanced overall water splitting in an alkaline medium. The Ni3P:FeMo catalyst exhibited outstanding electrocatalytic performance for both the hydrogen evolution reaction and oxygen evolution reaction with low overpotentials of −103 and 290 mV, respectively, at a high current density of 100 mA/cm2 along with fast electrocatalytic kinetics. A full water-splitting electrolyzer consisting of a bifunctional Ni3P:FeMo catalyst required a low cell voltage of 1.48 V to attain a current density of 10 mA/cm2 with excellent stability for more than 50 h. Density functional theory calculations provided insights into the microscopic mechanism of the effective modulation of the p- and d-band centers of the P and Ni active sites by the Mo and Fe codoping of Ni3P, thereby enhancing the bifunctional catalytic activity of Ni3P.

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“…10 Hence, electrochemical water splitting requires the development of a suitable, stable bifunctional electrocatalyst, which can reduce the overpotential needed for HER or OER. 11 Currently, the reported electrocatalyst for HER and OER are based on precious noble metals like Pt, Ir, Ru, etc. [12][13][14] The high cost and scarcity of these noble elements seriously hinder the extensive scale application of these catalysts in fuel cells.…”

Section: Introductionmentioning

confidence: 99%

Electrochemically dealloyed nanoporous Fe₄₀Ni₂₀Co₂₀P₁₅C₅ metallic glass for efficient and stable electrocatalytic hydrogen and oxygen generation

et al. 2021

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Nanoporous NiFeMoP alloy as a bifunctional catalyst for overall water splitting

Cited by 33 publications

References 50 publications

Insight into the Catalytic Activity of Amorphous Multimetallic Catalysts under a Magnetic Field toward the Oxygen Evolution Reaction

Insight into the Catalytic Activity of Amorphous Multimetallic Catalysts under a Magnetic Field toward the Oxygen Evolution Reaction

Experimental and Theoretical Insights into Transition-Metal (Mo, Fe) Codoping in a Bifunctional Nickel Phosphide Microsphere Catalyst for Enhanced Overall Water Splitting

Electrochemically dealloyed nanoporous Fe₄₀Ni₂₀Co₂₀P₁₅C₅ metallic glass for efficient and stable electrocatalytic hydrogen and oxygen generation

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Nanoporous NiFeMoP alloy as a bifunctional catalyst for overall water splitting

Cited by 33 publications

References 50 publications

Insight into the Catalytic Activity of Amorphous Multimetallic Catalysts under a Magnetic Field toward the Oxygen Evolution Reaction

Insight into the Catalytic Activity of Amorphous Multimetallic Catalysts under a Magnetic Field toward the Oxygen Evolution Reaction

Experimental and Theoretical Insights into Transition-Metal (Mo, Fe) Codoping in a Bifunctional Nickel Phosphide Microsphere Catalyst for Enhanced Overall Water Splitting

Electrochemically dealloyed nanoporous Fe40Ni20Co20P15C5 metallic glass for efficient and stable electrocatalytic hydrogen and oxygen generation

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Electrochemically dealloyed nanoporous Fe₄₀Ni₂₀Co₂₀P₁₅C₅ metallic glass for efficient and stable electrocatalytic hydrogen and oxygen generation