Rational design of Pt–Ni–Co ternary alloy nanoframe crystals as highly efficient catalysts toward the alkaline hydrogen evolution reaction

Oh, Aram; Jin, Young; Hwang, Hyeyoun; Baik, Hionsuck; Kim, Jun; Kim, Byeongyoon; Joo, Sang Hoon; Lee, Kwangyeol

doi:10.1039/c6nr04572c

Cited by 138 publications

(73 citation statements)

References 53 publications

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“…In contrast, the binary PNH deliver comparatively lower exchange current densities of 1.2 and 0.85 mA cm Pt −2 , signifying the promotional role of Co. In addition, it also showed excellent HER durability, attributed to the fact that the Ni and Co contents were leached from [100] branches of the hexapod nanostructure while the overall morphology was preserved during electrochemical reactions 68. By an analogous mechanism to Pt/Ni(OH) 2 as explained above (Figure 1), the faster HER kinetics of Pt–Ni–Co PNCH were attributed to the substantial negative shift in the formation potential of Pt–OH ad and the increase in the charge associated with the H‐binding energy compared to Pt/C, contributed by alloying and bifunctionality 69…”

Section: Overview Of Active Electrocatalyst In Alkaline Electrolytementioning

confidence: 98%

“…Evidently, PGMs still possess an “incomparable” HER activity in alkaline medium as discussed above, which is why researchers focused on the development of their alloys with transition metals to lower their price and enhance their activity by overcoming the inherent limitations 29. For example Pt–Re (Re: Sm, Ho, Ce) binary‐alloy based electrocatalysts were designed to improve the stability,29 similarly Pt/Fe was electrodeposited on nickel foam for binder free electrocatalyst,67 and Pt–Ni–Co ternary alloy nanoframe crystals have been tailored to enhance the efficiency of Pt for HER catalysis in alkaline electrolyte 68. Lee and co‐workers explored the effect of Ni and Co coexistence in the Pt ternary alloy by developing PtNiCo alloy nanohexapod (PNCH) dually coated with the Ni@Co shell in a single‐step formation route followed by a selective removal of Ni@Co shell ( Figure 4 a).…”

Section: Overview Of Active Electrocatalyst In Alkaline Electrolytementioning

confidence: 99%

Section: Overview Of Active Electrocatalyst In Alkaline Electrolytementioning

confidence: 99%

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Electrocatalysts for Hydrogen Evolution in Alkaline Electrolytes: Mechanisms, Challenges, and Prospective Solutions

et al. 2017

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Hydrogen evolution reaction (HER) in alkaline medium is currently a point of focus for sustainable development of hydrogen as an alternative clean fuel for various energy systems, but suffers from sluggish reaction kinetics due to additional water dissociation step. So, the state‐of‐the‐art catalysts performing well in acidic media lose considerable catalytic performance in alkaline media. This review summarizes the recent developments to overcome the kinetics issues of alkaline HER, synthesis of materials with modified morphologies, and electronic structures to tune the active sites and their applications as efficient catalysts for HER. It first explains the fundamentals and electrochemistry of HER and then outlines the requirements for an efficient and stable catalyst in alkaline medium. The challenges with alkaline HER and limitation with the electrocatalysts along with prospective solutions are then highlighted. It further describes the synthesis methods of advanced nanostructures based on carbon, noble, and inexpensive metals and their heterogeneous structures. These heterogeneous structures provide some ideal systems for analyzing the role of structure and synergy on alkaline HER catalysis. At the end, it provides the concluding remarks and future perspectives that can be helpful for tuning the catalysts active‐sites with improved electrochemical efficiencies in future.

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Section: Overview Of Active Electrocatalyst In Alkaline Electrolytementioning

confidence: 98%

Section: Overview Of Active Electrocatalyst In Alkaline Electrolytementioning

confidence: 99%

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Electrocatalysts for Hydrogen Evolution in Alkaline Electrolytes: Mechanisms, Challenges, and Prospective Solutions

et al. 2017

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“…[5][6][7][8][9] Although the fuels are different, all of them contain an anode (fuel electrooxidation), a cathode (oxygen reduction), and an electrolyte [10,11] ; the rates of these oxidation or reduction reactions are strongly depended on electrocatalysts, which determine the energy con-surface composition of these catalysts. Smaller dimensions and higher temperature could increase the atomic diffusion distance and expedite the diffusion rate, so as to finally affect the alloying process; (4) Adsorbent (such as CO [59,60] ) that could bind strongly to one element will pull the element out to the surface. Some studies have been carried out to control the surface composition of bimetallic nanomaterials, involving the formation of the Pt-skin structure and Pt-rich surface.…”

Section: Introductionmentioning

confidence: 99%

A Comprehensive Review on Controlling Surface Composition of Pt‐Based Bimetallic Electrocatalysts

Zhang

Yang

Wang

et al. 2018

Advanced Energy Materials

137

104

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version efficiency. [12][13][14][15] Among these metal electrocatalysts, platinum (Pt) exhibits the best activity for formic acid electrooxidation, ethanol electrooxidation, and oxygen reduction. However, pure Pt electrocatalyst faces several severe shortages, which limit its wide application in fuel cells. First, for formic acid and ethanol electrooxidation on pure Pt, the poisoning phenomenon (poison intermediates adsorption) usually happens on the surface of Pt, which will significantly decrease its electrocatalytic performance. [16][17][18][19][20] Second, for cathodic reaction, the oxygen reduction on pure Pt is sluggish. [21][22][23][24] Third, Pt is noble metal, which is limited reserve in nature. Therefore, how to reduce the Pt content and at the same time maintain its electrochemical performance are critical to achieve the commercialization of fuel cell.Bimetallic nanomaterials play an essential role in electrochemical energy conversion and storage, such as in fuel cells and metal-air batteries. [25][26][27] Unlike their monometallic counterparts, bimetallic nanomaterials ordinarily present better performance beneficial from synergistic effects, which means that the electrochemical performance of the whole will be superior than the sum of its parts. [28][29][30] In the case of the noble metals (especially Pt), their high cost and scarcity are obstructing the commercial viability of fuel cells. [31][32][33][34] Reducing the Pt loading without compromising its performance is the target of electrocatalytic investigations. [35][36][37] The typical approach is to incorporate with another metal, which could obtain better performance with much prolonged duration than the traditional commercial Pt/C. There are a great quantity of works on Ptbased bimetallic electrocatalysts, such as alloying Pt with 3d-transition metals, including Fe, [38,39] Co, [40][41][42] Ni, [43,44] and Cu. [45,46] PtM (M = Fe, Co, Ni, etc.) bimetallic nanomaterials have been demonstrated to be promising electrocatalysts, which strategic enhancement and development of the performance of commercial Pt/C electrocatalyst; and fundamental researches have shown that the enhanced catalytic activity originates from the modified electronic structures and geometric structures of Pt in these alloy catalysts. [47][48][49] It is a remarkable fact that these electrocatalytic reactions merely occur on the surface of the electrocatalysts. [28,50] Thus, the surface constituents of electrocatalysts determine the adsorption/desorption behaviors of the reactants and intermediates during the electrochemical reaction. Therefore, the catalytic reactions mechanisms and efficiencies strongly rely on the With increasing energy demands worldwide, significant efforts have been made to develop superior electrocatalysts for efficient energy conversion systems. Among all the electrocatalysts exploited, Pt-based bimetallic nanomaterials stand out by virtue of their high catalytic activity and relatively low cost due to the introduction of a nonprecious metal component. I...

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“…Alloying is also a useful way to improve the activity in monometallic Pt electrocatalysts because it can create a favorable electronic structure by modifying the local arrangement of surface atoms. Several bi‐ and tri‐metallic electrocatalysts have been generated by optimizing the surface atoms and their arrangement, leading to enhanced electrochemical activity , …”

Section: Introductionmentioning

confidence: 99%

A Simple Approach to Generate Hollow Carbon Nanospheres Loaded with Uniformly Dispersed Metal Nanoparticles

Tan

Takei

et al. 2017

Eur J Inorg Chem

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We describe a simple and versatile method to synthesize hollow carbon nanospheres (HCNs) loaded with well‐distributed metal nanoparticles (i.e., Ir‐HCNs, MoO2‐HCNs, and WO2/WO3‐HCNs). This procedure uses the electrostatic interaction between negatively charged metal precursors and positively charged micelle templates made of poly(styrene‐b‐2‐vinyl pyridine‐b‐ethylene oxide). The ion pairs are neutralized inside the micelles and then coated with a layer of phenolic resol. Pyrolysis transforms the nanoparticles into HCNs decorated with metal/metal oxide nanoparticles. HCNs are an excellent substrate for the in situ growth of metal nanoparticles, and this procedure can even provide reasonable control over the average size of the metal nanoparticles.

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Rational design of Pt–Ni–Co ternary alloy nanoframe crystals as highly efficient catalysts toward the alkaline hydrogen evolution reaction

Cited by 138 publications

References 53 publications

Electrocatalysts for Hydrogen Evolution in Alkaline Electrolytes: Mechanisms, Challenges, and Prospective Solutions

Electrocatalysts for Hydrogen Evolution in Alkaline Electrolytes: Mechanisms, Challenges, and Prospective Solutions

A Comprehensive Review on Controlling Surface Composition of Pt‐Based Bimetallic Electrocatalysts

A Simple Approach to Generate Hollow Carbon Nanospheres Loaded with Uniformly Dispersed Metal Nanoparticles

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