Selective phosphidation: an effective strategy toward CoP/CeO<sub>2</sub> interface engineering for superior alkaline hydrogen evolution electrocatalysis

Developing sustainable and renewable energy sources along with efficient energy storage and conversion technologies is vital to address environmental and energy challenges. Electrochemical water splitting coupling with gridscale renewable energy harvesting technologies is becoming one of the most promising approaches. Besides, hydrogen with the highest mass-energy density of any fuel is regarded as the ultimate clean energy carrier. The realization of practical water splitting depends heavily on the development of low-cost, highly active, and durable catalysts for hydrogen evolution reactions (HERs) and oxygen evolution reactions (OERs). Recently, heterostructured catalysts, which are generally composed of electrochemical active materials and various functional additives, have demonstrated extraordinary electrocatalytic performance toward HER and OER, and particularly a number of precious-metalfree heterostructures delivered comparable activity with precious-metal-based catalysts. Herein, an overview is presented of recent research progress on heterostructured HER catalysts. It starts with summarizing the fundamentals of HER and approaches for evaluating HER activity. Then, the design and synthesis of heterostructures, electrochemical performance, and the related mechanisms for performance enhancement are discussed. Finally, the future opportunities and challenges are highlighted for the development of heterostructured HER catalysts from the points of view of both fundamental understandings and practical applications.

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Section: Heterostructured Catalysts For Hermentioning

confidence: 99%

Heterostructures for Electrochemical Hydrogen Evolution Reaction: A Review

Zhao

Rui

Dou

et al. 2018

Adv Funct Materials

955

678

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“…The Co 2p3/2 region (Figure b) shows two peaks centered at the binding energies (BEs) of 778.6 and 782.1 eV with one shakeup satellite peak at 786.2 eV (marked as “s”), whereas the Co 2p1/2 region shows two peaks at 793.1 and 798.3 eV with a satellite peak at 803.0 eV. The peaks at 778.6 and 793.1 eV are assigned to Co in CoP (Co 3+ ), whereas the peaks at 782.1 and 798.3 eV arose from the superficial oxidation of CoP, which may exist in the form of Co 3 O 4 . Compared with fresh CoP, the BEs of Co 2p were positively shifted by ≈0.3 eV, showing a modification of the electronic structure by the introduction of Mo .…”

Section: Resultsmentioning

confidence: 99%

Mo‐Doped Cobalt Phosphide Nanosheets for Efficient Hydrogen Generation in an Alkaline Media

Liu

Wei

Su³

et al. 2019

Energy Tech

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The development of high‐active, low‐cost, and robust electrocatalysts is vitally important for electrocatalytic water splitting. Herein, Mo‐doped cobalt phosphide (Mo‐CoP) nanosheets on carbon cloth are successfully prepared and evaluated for hydrogen evolution reaction (HER) catalyst. The Mo‐CoP catalyst displays an excellent electrocatalytic activity and stability toward HER in 1 m KOH solution. Relatively low overpotentials of 49 and 120 mV are required to reach the current densities of 10 and 100 mA cm−2, respectively. Moreover, the Mo‐CoP catalyst shows an exceptional stability with 24 h operation. The origin of improvement can be ascribed to Mo doping, which probably results in more active sites, higher electrical conductivity, and faster mass transfer. This work demonstrates a promising electrocatalyst for water electrolysis in an alkaline media and opens new possibilities for exploring water‐splitting catalysts.

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“…[10, 11d, 13] Therefore, as pecial strategyi sn eeded to improvet he catalytic activity of nickelbased catalysts. [15] However,t he HER electrocatalyst must not only afford favorable catalytic activity,b ut also offer excellentc onductivity and al arge specific area. The solid byproduct, Ni/CeO 2 /carbon nanotube (CNT),w as further employed as an electrocatalyst in the hydrogen evolution reaction( HER) for H 2 production.…”

Section: Introductionmentioning

confidence: 99%

“…[14] Based on special redoxp roperties, CeO 2 is always chosen as an oxide support to disperse metal particles and form an active metal-support interface. [15] However,t he HER electrocatalyst must not only afford favorable catalytic activity,b ut also offer excellentc onductivity and al arge specific area. [14] Thus, the Ni/CeO 2 catalyst itself is insufficientf or high HER activity.…”

Section: Introductionmentioning

confidence: 99%

Integrating Catalysis of Methane Decomposition and Electrocatalytic Hydrogen Evolution with Ni/CeO₂ for Improved Hydrogen Production Efficiency

Zhang

Drewett

et al. 2019

ChemSusChem

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Ni/CeO2 enables either methane decomposition or water electrolysis for pure hydrogen production. Ni/CeO2, prepared by a sol–gel method with only one heat treatment step, was used to catalyze methane decomposition for the generation of H2. The solid byproduct, Ni/CeO2/carbon nanotube (CNT), was further employed as an electrocatalyst in the hydrogen evolution reaction (HER) for H2 production. The Ni/CeO2 catalyst exhibits excellent activity for methane decomposition because CeO2 prevents carbon encapsulation of Ni nanoparticles during the preparation process and forms a special metal–support interface with Ni. The derived CNTs act as antenna to improve conductivity and promote the dispersion of agglomerated Ni/CeO2. In addition, they provide H2 diffusion paths and prevent Ni/CeO2 from peeling off the HER electrode. Although long‐term methane decomposition reduces the HER activity of Ni/CeO2/CNTs (owing to degradation of the delicate Ni/CeO2 interface), the tunable nature of the synthesis makes this an attractive sustainable approach to synthesize future high‐performance materials.

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Selective phosphidation: an effective strategy toward CoP/CeO₂ interface engineering for superior alkaline hydrogen evolution electrocatalysis

Abstract: In 1.0 M KOH, CoP–CeO2 nanosheets film on Ti mesh (CoP–CeO2/Ti) attains 10 mA cm−2 at overpotential of 43 mV due to its lower water dissociation free energy and more optimal hydrogen adsorption free energy than CoP.

Cited by 213 publications

References 56 publications

Heterostructures for Electrochemical Hydrogen Evolution Reaction: A Review

Heterostructures for Electrochemical Hydrogen Evolution Reaction: A Review

Mo‐Doped Cobalt Phosphide Nanosheets for Efficient Hydrogen Generation in an Alkaline Media

Integrating Catalysis of Methane Decomposition and Electrocatalytic Hydrogen Evolution with Ni/CeO₂ for Improved Hydrogen Production Efficiency

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Selective phosphidation: an effective strategy toward CoP/CeO2 interface engineering for superior alkaline hydrogen evolution electrocatalysis

Abstract: In 1.0 M KOH, CoP–CeO2 nanosheets film on Ti mesh (CoP–CeO2/Ti) attains 10 mA cm−2 at overpotential of 43 mV due to its lower water dissociation free energy and more optimal hydrogen adsorption free energy than CoP.

Cited by 213 publications

References 56 publications

Heterostructures for Electrochemical Hydrogen Evolution Reaction: A Review

Heterostructures for Electrochemical Hydrogen Evolution Reaction: A Review

Mo‐Doped Cobalt Phosphide Nanosheets for Efficient Hydrogen Generation in an Alkaline Media

Integrating Catalysis of Methane Decomposition and Electrocatalytic Hydrogen Evolution with Ni/CeO2 for Improved Hydrogen Production Efficiency

Contact Info

Product

Resources

About

Selective phosphidation: an effective strategy toward CoP/CeO₂ interface engineering for superior alkaline hydrogen evolution electrocatalysis

Integrating Catalysis of Methane Decomposition and Electrocatalytic Hydrogen Evolution with Ni/CeO₂ for Improved Hydrogen Production Efficiency