Ordered mesoporous Ni Co alloys for highly efficient electrocatalytic hydrogen evolution reaction

Sun, Tingting; Cao, Jia Jia; Dong, Jing; Du, Hanying; Zhang, Haijiang; Chen, Jianfeng; Xu, Lianbin

doi:10.1016/j.ijhydene.2017.01.071

Cited by 89 publications

(32 citation statements)

References 65 publications

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“…Hence the bimetallic Ag/Ni/OHP flexible electrode is identified to be a better electrocatalyst for HER when compared to other electrodes. The calculated Tafel slope values and the overpotential values are compared with other reported values corresponding to non‐Pt based catalysts and the comparison is shown in Table . It can be seen that the overpotential and Tafel slope values are comparable to many other reports .…”

Section: Resultssupporting

confidence: 66%

High‐Performance Electrocatalysts for Hydrogen Evolution Reaction Using Flexible Electrodes Made up of Chemically Modified Polyester Films

Raju

Ganesh

2018

ChemistrySelect

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In this work we propose a simple methodology to fabricate monometallic nickel [Ni] and bimetallic silver‐nickel [Ag/Ni] deposited flexible, self‐supported electrodes using polyester (commonly used as overhead projector [OHP]) films. Monometallic Ni is deposited onto chemically modified OHP sheets using a simple electroless deposition process. Similarly bimetallic Ag/Ni coating is carried out by employing galvanic replacement reaction (GRR) of silver onto Ni coated polyester films. Structure, morphology, composition and crystalline phase characteristics of these monometallic and bimetallic deposited flexible electrodes are analyzed by using a variety of spectroscopic and microscopic techniques. Electrochemical characteristics corresponding to hydrogen evolution reaction (HER) are investigated by using linear sweep voltammetry (LSV), Tafel polarization and impedance spectroscopic studies. Effect of time duration associated with GRR on the structural morphology of resultant deposits and on their HER electrocatalytic activity is also investigated. These studies reveal that compared to monometallic Ni, bimetallic Ag/Ni deposited flexible electrodes exhibit enhanced electrocatalytic performance for HER due to strong synergistic effect of bimetallic heterostructures. Among the various electrodes investigated, bimetallic Ag/Ni coated flexible polyester films obtained through 5 minutes of GRR show a higher electrocatalytic activity for HER. These results provide a platform towards the development of alternative electrodes for HER using simple and affordable techniques that play a significant role for further advancement of alkaline water electrolysis.

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Section: Resultssupporting

confidence: 66%

High‐Performance Electrocatalysts for Hydrogen Evolution Reaction Using Flexible Electrodes Made up of Chemically Modified Polyester Films

Raju

Ganesh

2018

ChemistrySelect

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“…The trend for the Tafel slope in this Co‐Cu alloy was similarly observed in other cases of nonprecious metal alloy catalysts. For example, Sun et al reported a volcano‐like behavior of Tafel slopes according to the composition of NiCo alloy HER catalysts. Compound catalysts composed of MoS 2(1‐x) Se 2x also exhibited a minimum Tafel slope when x = 0.47 while the large or smaller x resulted in the higher Tafel slopes .…”

Section: Resultsmentioning

confidence: 99%

Facile electrochemical preparation of nonprecious Co‐Cu alloy catalysts for hydrogen production in proton exchange membrane water electrolysis

Kim

Park

et al. 2019

Int J Energy Res

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Summary To realize nonprecious‐metal catalysts with practical applicability for the hydrogen evolution reaction (HER), improved corrosion resistance and catalytic activity are required. In this study, composition‐controlled Co‐Cu alloys were fabricated by electrodeposition for use as HER catalysts in proton exchange membrane water electrolyzers (PEMWEs). As the Cu content in the alloy increased, the morphology changed from needle‐shaped particles to small round particles. Furthermore, a phase transition from a hexagonal close‐packed structure to a face‐centered cubic structure occurs because the latter structure is stabilized by adding Cu to Co. The optimum catalyst composition for the HER was found to be Co59Cu41, which had an overpotential of 342 mV at −10 mA cm−2. This catalyst exhibited excellent durability, showing a potential reduction of approximately 100 mV over 12 hours under a constant current density. This superior performance was attributed to the increase in the electrochemical surface area resulting from the addition of Cu, as confirmed by electrochemical double layer capacitance measurements, in addition to a counterbalance between the hydrogen adsorption energies of Co and Cu. Finally, the application of the Co‐Cu alloy catalyst as a cathode catalyst in a PEMWE resulted in excellent performance of 1.2 A cm−2 at 2.0 Vcell.

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“…Therefore, the incorporation of other metals to Ni (smaller values of ∆G H as compared with other earth abundant metals) to form alloys such as NiCo, NiMo, NiCu and ternary metal alloys such as NiMoZn is a promising method to produce electrocatalysts with enhanced HER performances. In addition, synergetic effects can be observed if two transition metals are combined, increasing conductivity [242][243][244][245][246][247][248][249][250][251][252][253][254], making Ni-Co alloys efficient electrocatalysts due to improved intrinsic catalytic activities and corrosion resistance behaviours in alkaline media. For example, Sun et al [243] reported the synthesis of mesoporous NiCo alloys through the electroless deposition method by using different compositions of lyotropic liquid crystals (LLC) as the mesoporous template.…”

Section: Ni-based Alloysmentioning

confidence: 99%

“…b-e SEM images of mesostructured Ni 100−x Co x alloys prepared from different LLC compositions. j Tafel plot of NiCo [243]. f-i FESEM micrographs of the Ni x Cu y alloys prepared under deposition conditions [251] of 54 mV dec −1 with a current density of 10 mA cm −2 .…”

Section: Ni-based Phosphidesmentioning

confidence: 99%

Recent Progresses in Electrocatalysts for Water Electrolysis

Khan

Zhao

Zou

et al. 2018

Electrochem. Energ. Rev.

360

178

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The study of hydrogen evolution reaction and oxygen evolution reaction electrocatalysts for water electrolysis is a developing field in which noble metal-based materials are commonly used. However, the associated high cost and low abundance of noble metals limit their practical application. Non-noble metal catalysts, aside from being inexpensive, highly abundant and environmental friendly, can possess high electrical conductivity, good structural tunability and comparable electrocatalytic performances to state-of-the-art noble metals, particularly in alkaline media, making them desirable candidates to reduce or replace noble metals as promising electrocatalysts for water electrolysis. This article will review and provide an overview of the fundamental knowledge related to water electrolysis with a focus on the development and progress of non-noble metal-based electrocatalysts in alkaline, polymer exchange membrane and solid oxide electrolysis. A critical analysis of the various catalysts currently available is also provided with discussions on current challenges and future perspectives. In addition, to facilitate future research and development, several possible research directions to overcome these challenges are provided in this article.

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Ordered mesoporous Ni Co alloys for highly efficient electrocatalytic hydrogen evolution reaction

Cited by 89 publications

References 65 publications

High‐Performance Electrocatalysts for Hydrogen Evolution Reaction Using Flexible Electrodes Made up of Chemically Modified Polyester Films

High‐Performance Electrocatalysts for Hydrogen Evolution Reaction Using Flexible Electrodes Made up of Chemically Modified Polyester Films

Facile electrochemical preparation of nonprecious Co‐Cu alloy catalysts for hydrogen production in proton exchange membrane water electrolysis

Recent Progresses in Electrocatalysts for Water Electrolysis

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