Novel nickel–cobalt phosphite with face-sharing octahedra derived electrocatalyst for efficient water splitting

Wu, Jian; Lin, Lingling; Morvan, F. J.; Du, Jiangfeng; Fan, Wei

doi:10.1039/c9qi00370c

Cited by 14 publications

(11 citation statements)

References 40 publications

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“…In addition to the single metal phosphides, the bi‐metal systems observed better in the electrocatalytic performance with high number of surface area and the conductivity [49,55,76,93,112,113] . There are very few reports with the findings of such synergistic effect of this bi‐metal system and their activity in the electrocatalytic water splitting [53,114–118] . Following are the reported work in NiCoP electrocatalyst system as a bi‐functional catalyst for overall‐water splitting reaction [53,75,119] .…”

Section: Transition Metal Phosphide Electrocatalyst For Twsmentioning

confidence: 96%

Recent Progresses in Engineering of Ni and Co based Phosphides for Effective Electrocatalytic Water Splitting

et al. 2021

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Producing pure hydrogen (H2) is presumably an alternative way for replacing the fossil fuels. Since the last few decades finding alternatives for state‐of‐the‐art catalysts such as IrO2 and RuO2 for oxygen evolution reaction (OER) and platinum for hydrogen evolution reaction (HER) has been a major challenge in the field of water electrolysis. To replace such precious metals, many efforts have been made to develop transition metal based bifunctional catalyst for alkaline water electrolysis. Among them, transition metal phosphides (TMPs) show superior activity in both OER and HER with varying pH conditions. Moreover, the different phases of phosphides, P‐rich or P deficient metal composites (Ni/Co−P) offer a great opportunity in total water splitting (TWS) applications. There is no detailed review in the literature outlining the possible combinations, synthesis methods and morphologies of Ni and Co based phosphides. Based on the above shortage about TMPs as a bi‐functional catalyst for water electrolysis, this review summarizes the activity and stability Ni and Co phosphides. Furthermore, the review highlights monometallic phosphides such as NiP and CoP, bi‐metallic phosphides such as NiCoP, and the synergistic effect of doping Fe into NiP/CoP or Fe ‐NiCoP systems while detailing their preparation methods. Overall, this review extends the role of designing Ni and Co phosphides for efficient large scale electrocatalysis of hydrogen production.

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Section: Transition Metal Phosphide Electrocatalyst For Twsmentioning

confidence: 96%

Recent Progresses in Engineering of Ni and Co based Phosphides for Effective Electrocatalytic Water Splitting

et al. 2021

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“…J. Wu et al. have studied the effect of metal octahedral structural linkage in Ni−Co−P−O compounds on their OER electrocatalytic activity and shown that face sharing octahedra of Ni and Co in Ni−Co phosphites ((Co/Ni) 11 (HPO 3 ) 8 (OH) 6 ) favor improved OER due to the super exchange eﬀect of Co−O−Ni . Majority of the reports on Ni or Co−Phi are focused on their performance as energy storage materials such as supercapacitors and batteries .…”

Section: Introductionmentioning

confidence: 99%

Nickel Cobalt Phosphite Nanorods Decorated with Carbon Nanotubes as Bifunctional Electrocatalysts in Alkaline Medium with a High Yield of Hydrogen Peroxide

2020

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It is highly desirable to develop an energy generation system comprising a low-cost and earth-abundant non-noble metal catalyst for bifunctional electrocatalysis with good overall process performance, especially for applications in fuel cells or metal-air batteries. In this report, we show that nickel cobalt phosphite (NiCoÀ Phi) decorated with carbon nanotubes (CNTs) can perform as a bifunctional electrocatalyst for the oxygen evolution and oxygen reduction reactions (OER and ORR, respectively). The NiCoÀ Phi/CNT composite is synthesized by employing a simple, single-step hydrothermal method. The morphology of the composite consists of nanorod bundles of NiCoÀ Phi decorated with CNTs. The synthesized NiCoÀ Phi/CNT composite exhibits enhanced electrochemical OER activity with an overpotential of 400 mV at a current density of 10 mA/cm 2 and a Tafel slope value of 117 mV dec À 1 in 1 M KOH, possessing high stability towards the OER for 20 h. The ORR using the same catalyst shows an onset potential of 0.75 V and a Tafel slope of 100 mV dec À 1 in 0.1 M KOH with high-yield production of H 2 O 2 (85 %). The predominant formation of H 2 O 2 occurs mainly through a two-electron transfer process, as established by mass-controlled kinetic studies and has not been observed previously in these phosphorous oxy anion-based materials. The superior bifunctional nature of NiCoÀ Phi/CNT towards the OER and ORR arises from the synergistic effect of doped metal phosphites and CNTs.

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“…This structure evolution is experimentally realized for the first time, and then these materials were conducted for a typical multi-phase reaction of water splitting. [6] Benefitting from the structure advantages, the CoP HoMSs with close duplicated shells facilitate the escape of gas bubbles because of unbalanced Laplace pressure, [7] and enhance the driving force for liquid diffusion [8] due to capillary action, thus achieving excellent catalytic performance in both hydrogen evolution reaction (HER) and oxygen evolution reaction (OER).…”

mentioning

confidence: 99%

Delicate Control on the Shell Structure of Hollow Spheres Enables Tunable Mass Transport in Water Splitting

Hou

Yang

et al. 2021

Angew Chem Int Ed

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In the study of structure–property relationships for rational materials design, hollow multishell structures (HoMSs) have attracted tremendous attention owing to the optimal balance between mass transfer and surface exposure. Considering the shell structure can significantly affect the properties of HoMSs, in this paper, we provide a novel one‐step strategy to continually regulate the shell structures of HoMSs. Through a simple phosphorization process, we can effectively modify the shell from solid to bubble‐like and even duplicate the shells with a narrow spacing. Benefitting from the structure merits, the fabricated CoP HoMSs with close duplicated shells can promote gas release owing to the unbalanced Laplace pressure, while accelerating liquid transfer for enhanced capillary force. It can provide effective channels for water and gas and thus exhibits a superior electrocatalytic performance in the hydrogen and oxygen evolution reaction.

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Novel nickel–cobalt phosphite with face-sharing octahedra derived electrocatalyst for efficient water splitting

Cited by 14 publications

References 40 publications

Recent Progresses in Engineering of Ni and Co based Phosphides for Effective Electrocatalytic Water Splitting

Recent Progresses in Engineering of Ni and Co based Phosphides for Effective Electrocatalytic Water Splitting

Nickel Cobalt Phosphite Nanorods Decorated with Carbon Nanotubes as Bifunctional Electrocatalysts in Alkaline Medium with a High Yield of Hydrogen Peroxide

Delicate Control on the Shell Structure of Hollow Spheres Enables Tunable Mass Transport in Water Splitting

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