CoMn phosphide encapsulated in nitrogen-doped graphene for electrocatalytic hydrogen evolution over a broad pH range

Liu, Jingjing; Li, Wenyao; Cui, Zhe; Li, Jiaojiao; Yang, Fang; Huang, Liping; Ma, Caiyu; Zeng, Min

doi:10.1039/d0cc07523j

Cited by 19 publications

(10 citation statements)

References 39 publications

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“…The peaks at 641.44 and 653.96 eV are attributed to Mn 2+ , while the peaks at 643 and 656.06 eV correspond to Mn 3+ . 37 Besides, a shakeup satellite peak is observed at 646.03 eV. 36 For Mn–Co–O, the two prominent peaks appearing at 641.84 and 653.54 eV in the Mn 2p spectrum are assigned to the spin–orbit doublets of Mn 2p 3/2 and Mn 2p 1/2 .…”

Section: Resultsmentioning

confidence: 99%

Binder free construction of hollow hierarchical Mn–Co–P nanoarrays on nickel foam as an efficient bifunctional electrocatalyst for overall water splitting

Wang

Guo

et al. 2022

Sustainable Energy Fuels

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Section: Resultsmentioning

confidence: 99%

Binder free construction of hollow hierarchical Mn–Co–P nanoarrays on nickel foam as an efficient bifunctional electrocatalyst for overall water splitting

Wang

Guo

et al. 2022

Sustainable Energy Fuels

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“…The following supporting information can be downloaded at https: //www.mdpi.com/article/10.3390/catal12070739/s1, Figure S1 S1: ECSA determination of the CFP supported nanocubes; Table S2: comparison of the HER electrochemical performance overpotentials (η 10 ) and Tafel slopes for similar composite materials reported in the literature [40,[52][53][54][55][56][57][58][59][60][61].…”

Section: Supplementary Materialsmentioning

confidence: 99%

The High Electrocatalytic Performance of NiFeSe/CFP for Hydrogen Evolution Reaction Derived from a Prussian Blue Analogue

Guo

Liu

et al. 2022

Catalysts

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Non-noble-metal-based chalcogenides are promising candidates for hydrogen evolution reaction (HER) by harnessing the architectural design and the synergistic effect between the elements. Herein, a porous bimetallic selenide (NiFeSe) nanocube deposited on carbon fiber paper (NiFeSe/CFP) was synthesized through a facile selenization reaction based on Prussian blue analogues (PBAs) as precursors. The NiFeSe/CFP exhibited excellent HER activity with an overpotential of just 186 mV for a current density of 10 mA cm−2 in 1.0 M KOH at ambient temperature, similar to most of the state-of-the-art transition metal chalcogenides. The corresponding Tafel slope was calculated to be 52 mV dec−1, indicating fast discharge of the proton during the HER. Furthermore, the catalyst could endure long-term catalytic tests and showed remarkable durability. The enhanced electrocatalytic performance of NiFeSe/CFP is attributed to the unique 3D porous configuration inherited from the PBA templates, enhanced charge transfer occurring at the heterogeneous interface due to the synergistic effect between the bimetallic phases, and the high conductivity improved by the formation of amorphous carbon shells during the selenization. These findings prove that the combination of inexpensive metal–organic framework precursors and hybrid metallic compounds is a feasible way to realize the performance enhancement of non-noble-metal-based chalcogenides towards alkaline HER.

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“…[26] For CoFe@G, the binding energy at 283.9, 284.7, 285.5, 286.2, and 288.6 eV were attribut able to metal-carbon group (M-C), sp 2 C, sp 3 C, CO and CO in CoFe@G (Figure 3b). [34,[36][37][38][39][40] It is worth noting that the newly emerging M-C bond in CoFe@G will play a critical role in accelerating electron transfer during elec trochemical process. [41] Fe 2p spectrum in Figure 3c illus trates the characteristic peaks of Fe 0 at 708.9/720.5 eV (2p 3/2 /2p 1/2 ), remaining peaks located at 711.7/724.7 eV (Fe 2p 3/2 /2p 1/2 ) with satellite peaks at 715.6 and 729.5 eV implies the Fe 3+ which is attributed to surface oxidation.…”

Section: Characterization Of Cofe Pba and Cofe@gmentioning

confidence: 99%

New Insight into the Mechanism of Simultaneous Determination of Ascorbic Acid, Dopamine, and Uric Acid with Graphene Encapsulated CoFe Alloys Electrochemical Sensor

Chen

Qin

Tian

et al. 2022

Adv Materials Inter

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Ascorbic acid (AA), dopamine (DA), and uric acid (UA) are biological molecules coexisting in human serum. AA plays a vital role in regulation of the redox meta bolism, promoting the synthesis of catecho lamine and scavenging reactive oxygen species (ROS). [1] DA controls central nervous system [2,3] and cardiovascular system functions. [4][5][6] Low level of DA is closely related to diseases such as Parkinson's and Alzheimer's disease. [7] UA is the final metabolite of purine and sev eral diseases such as gout, renal disorders, cardiovascular, etc. often result from exces sive uric acid level. [8] Thus, monitoring the concentration level of these biomolecules in human body metabolism is vital for healthcare and clinical diagnostics. Electro chemical sensor has been widely applied in medical, food, pharmaceutical, environ ment fields for analytes detecting (e.g., bio markers, toxic chemicals, drugs). [9][10][11] This technique has been considered to be supe rior to other detecting methods such as highperformance liquid chroma tography, Uv-vis spectrometry and chemiluminescence due to its low cost, simple equipment, and ease of operation. [12] As the development of portable health care devices (e.g., wearable biosensor, point of care sensing plat form, etc.), electrochemical sensor has become an idea candi date to realize those devices since it can be easily integrated on an electrical circuit. However, to meet the demand of practical application, it is still challenging to develop an electrochemical sensor with high selectivity and sensitivity. AA, DA, and UA are electrochemically active biomolecules and can be oxidized under different applied potential in an electrochemical system. [13,14] Theoretically, as to the different molecular structure of AA, DA, and UA, they are supposed to show volt-ampere responses at distinguishable oxidation potentials. However, since their oxi dation potentials are too close, an overlapping potential usually occurs when simultaneously detect AA, DA, and UA in a ternary mixture at a bare electrode, resulting in a low resolution or even fail to distinguish each signal. Thus, electrode modifying is cru cial for AA, DA, and UA detection. Herein, a novel electrochemical biosensor is simply constructed by using graphene encapsulated CoFe alloy nanocomposite (CoFe@G) as the electrode modifier for highly sensitive and simultaneous detection of ascorbic acid (AA), dopamine (DA), and uric acid (UA). Cyclic voltammetry tests show well-separated peaks for AA at −7 mV, DA at 186 mV, and UA at 325 mV. CoFe@G modifier improves the differentiation of oxidative potential gap between AA and DA, realizing selective detection of these biomolecules. The mechanism of selective detection ability is studied by electrochemical impedance spectroscopy, quartz crystal microbalance (QCM), and in situ attenuated total reflection surface-enhanced infrared absorption spectroscopy (ATR-SEIRAS) analysis. It is demonstrated that modifying CoFe@G on glassy carbon electrode (GCE) can effectively lower the oxidation pot...

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CoMn phosphide encapsulated in nitrogen-doped graphene for electrocatalytic hydrogen evolution over a broad pH range

Abstract: A core–shell CoMn-P@NG heterostructure electrode demonstrated impressive performance of hydrogen evolution over a broad pH range and maintained excellent stability.

Cited by 19 publications

References 39 publications

Binder free construction of hollow hierarchical Mn–Co–P nanoarrays on nickel foam as an efficient bifunctional electrocatalyst for overall water splitting

Binder free construction of hollow hierarchical Mn–Co–P nanoarrays on nickel foam as an efficient bifunctional electrocatalyst for overall water splitting

The High Electrocatalytic Performance of NiFeSe/CFP for Hydrogen Evolution Reaction Derived from a Prussian Blue Analogue

New Insight into the Mechanism of Simultaneous Determination of Ascorbic Acid, Dopamine, and Uric Acid with Graphene Encapsulated CoFe Alloys Electrochemical Sensor

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