Bifunctional Electrocatalysis on Pd‐Ni Core–Shell Nanoparticles for Hydrogen Oxidation Reaction in Alkaline Medium

Shviro, Meital; Polani, Shlomi; Dunin-Borkowski, Rafal E.; Zitoun, David

doi:10.1002/admi.201701666

Cited by 45 publications

(33 citation statements)

References 36 publications

(41 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…139,142 In addition, it was proposed that the activation energy for both water formation and water dissociation decrease at the interface between Ni3N and Ni 139,142 . As a result, the reported carbon-supported Ni3N [155][156][157] or by tuning the hydrogen binding energy. 134 Considering the above-mentioned reasons, in what follows, we will only discuss NiM systems with a non-precious second component (Table 1).…”

Section: Hor On Monometallic Ni Electrodesmentioning

confidence: 92%

Recent Advances in the Understanding of Nickel-Based Catalysts for the Oxidation of Hydrogen-Containing Fuels in Alkaline Media

et al. 2020

View full text Add to dashboard Cite

Nickel is a very abundant transition metal in the Earth crust, and finds numerous applications in electrochemical processes where metallic Ni or its oxides are thermodynamically stable, particularly in alkaline environments. This contribution addresses electrocatalytic properties of Ni-based catalysts in reactions of fuel oxidation in alkaline media. It firstly details the electrochemical behavior of Ni in alkaline media and approaches to determine the active surface area of Ni electrodes. Secondly, the electrocatalytic activities of Ni-based electrocatalysts for the alkaline hydrogen oxidation reaction are described (an endeavor for the development of anion exchange membrane fuel cells), along with a detailed analysis of the strategies put forward to improve them. It is notably shown that the state of Ni surface (oxidized or reduced) largely determines its electrocatalytic activity. This state of the surface also conveys a pivotal importance regarding the activity of Ni for the oxidation of complex fuels (borohydride, boranes and hydrazine). Finally, emphasis is made on the durability of Ni-based catalysts in alkaline environments. It is shown that in such media, the materials durability of Ni-based electrodes can be high, but this does not necessarily warrant stable electrocatalytic activity, owing to possible deactivation following surface oxide or bulk hydride formation in operation.

show abstract

Section: Hor On Monometallic Ni Electrodesmentioning

confidence: 92%

Recent Advances in the Understanding of Nickel-Based Catalysts for the Oxidation of Hydrogen-Containing Fuels in Alkaline Media

et al. 2020

View full text Add to dashboard Cite

show abstract

“…[ 3 ] However, the kinetics of alkaline hydrogen oxidation reaction (HOR) is normally two orders of magnitude lower than that in acidic media, [ 4 ] and thus requiring a large quantity of noble metal electrocatalysts to accelerate the reaction. [ 5 ]…”

Section: Introductionmentioning

confidence: 99%

Pt_0.25Ru_0.75/N‐C as Highly Active and Durable Electrocatalysts toward Alkaline Hydrogen Oxidation Reaction

Chai

Zhao

et al. 2020

Adv Materials Inter

View full text Add to dashboard Cite

A series of uniform 3.0–3.8 nm Pt1−xRux particles supported on nitrogen‐doped carbon (N‐C) is synthesized by wet‐impregnation, high‐temperature reduction, and high‐temperature NH3 etching. As far as it is known, the resultant Pt0.25Ru0.75/N‐C exhibits the highest activity toward alkaline hydrogen oxidation reaction (HOR) in terms of mass specific exchange current density (j0,m, 1654 A gPtRu−1), that is 4.7 and 1.4 times of commercial Pt/C (352 A gPt−1) and PtRu/C (1213 A gPtRu−1), respectively. The remarkable activity originates from a high electrochemical active surface area (ECSA), weakened hydrogen binding energy (HBE), and appropriate oxophilic property. Additionally, the Pt0.25Ru0.75/N‐C displays much improved durability during potential cycling with respect to commercial Pt/C and commercial PtRu/C, likely arising from the stabilizing effect of nitrogen dopant of N‐C on Pt0.25Ru0.75. Furthermore, the single cell fabricated with 0.08 mgPt cm−2 of the Pt0.25Ru0.75/N‐C as the anode reaches a peak power density of 831 mW cm−2, which is 1.8 and 1.1 times of that fabricated with 0.2 mgPt cm−2 of commercial Pt/C and 0.13 mgPt cm−2 of commercial PtRu/C as the anode, respectively. This study exhibits that low‐platinum alkaline HOR electrocatalyst should be a highly promising approach for hydroxide exchange membrane fuel cells (HEMFCs).

show abstract

“…[ 42 ] Many recent studies have supported this bifunctional mechanism. [ 49–53 ] Besides, Wei and co‐workers studied the role of OH* in the HOR on Pt(110), Ir(110), Pd(110), Ni(110), and PtRu(110) using density functional theory (DFT) calculations. [ 54 ] The authors found that OH* adsorption induces remarkably different effects on H* and adsorbed water molecule (H 2 O*), and the combination of Δ G OH* , Δ G H* , and Δ G H2O* should be evaluated altogether to achieve a more precise and comprehensive understanding on the HOR/HER mechanism.…”

Section: Hor Mechanismmentioning

confidence: 99%

Non‐Platinum Group Metal Electrocatalysts toward Efficient Hydrogen Oxidation Reaction

Zhao

Chen

Sun

et al. 2021

Adv Funct Materials

View full text Add to dashboard Cite

Developing non‐platinum group metal (non‐PGM) electrocatalysts for the hydrogen oxidation reaction (HOR) represents the efforts towards the more economical use of hydrogen fuel cells and hydrogen energy, which has attracted tremendous attention recently. However, non‐PGM electrocatalysts for the HOR are still in their early development stages as compared with the significant advances in those for the oxygen reduction reaction and hydrogen evolution reaction. Herein, this paper summarizes the recent progresses and highlights the key challenges for the rational design of non‐PGM electrocatalysts, aiming to promote the development of non‐PGM HOR electrocatalysts. Fundamental understandings of the HOR mechanism are firstly reviewed, where theoretical interpretations on the low HOR kinetics in alkaline media, including the hydrogen binding energy theory, the bifunctional mechanism, and the water molecule reorganization, are particularly discussed. Subsequently, progresses of typical non‐PGM HOR electrocatalysts in acid and alkaline media are summarized separately. For the HOR under alkaline conditions, the superiorities and challenges of Ni‐based catalysts are discussed with a particular focus as they are the most promising non‐PGM electrocatalysts. Finally, this paper highlights the challenges and provide perspectives on the future development directions of non‐PGM HOR electrocatalysts.

show abstract

Bifunctional Electrocatalysis on Pd‐Ni Core–Shell Nanoparticles for Hydrogen Oxidation Reaction in Alkaline Medium

Cited by 45 publications

References 36 publications

Recent Advances in the Understanding of Nickel-Based Catalysts for the Oxidation of Hydrogen-Containing Fuels in Alkaline Media

Recent Advances in the Understanding of Nickel-Based Catalysts for the Oxidation of Hydrogen-Containing Fuels in Alkaline Media

Pt_0.25Ru_0.75/N‐C as Highly Active and Durable Electrocatalysts toward Alkaline Hydrogen Oxidation Reaction

Non‐Platinum Group Metal Electrocatalysts toward Efficient Hydrogen Oxidation Reaction

Contact Info

Product

Resources

About

Bifunctional Electrocatalysis on Pd‐Ni Core–Shell Nanoparticles for Hydrogen Oxidation Reaction in Alkaline Medium

Cited by 45 publications

References 36 publications

Recent Advances in the Understanding of Nickel-Based Catalysts for the Oxidation of Hydrogen-Containing Fuels in Alkaline Media

Recent Advances in the Understanding of Nickel-Based Catalysts for the Oxidation of Hydrogen-Containing Fuels in Alkaline Media

Pt0.25Ru0.75/N‐C as Highly Active and Durable Electrocatalysts toward Alkaline Hydrogen Oxidation Reaction

Non‐Platinum Group Metal Electrocatalysts toward Efficient Hydrogen Oxidation Reaction

Contact Info

Product

Resources

About

Pt_0.25Ru_0.75/N‐C as Highly Active and Durable Electrocatalysts toward Alkaline Hydrogen Oxidation Reaction