One-pot synthesis of IrNi@Ir core-shell nanoparticles as highly active hydrogen oxidation reaction electrocatalyst in alkaline electrolyte

Liu, Di; Lu, Siqi; Xue, Yanrong; Guan, Zhi Qiang; Fang, Jinjie; Zhu, Wei; Zhuang, Zhongbin

doi:10.1016/j.nanoen.2019.01.070

Cited by 81 publications

(72 citation statements)

References 46 publications

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“…) and Ir/C (0.16 mA lg Ir À1 ) and most of the reported state-of-the-art HOR catalysts ( Fig. 2d and Table S2 online) [23,[38][39][40][41][42][43][44][45].…”

mentioning

confidence: 87%

“…The exchange current densities (j 0 ) of the three catalysts can be calculated by the Butler-Volmer equation [10], with the values of 1.56 mA cm Ir -2 for IrWO x / C, which is much higher than that of Ir/C (0.64 mA cm Ir -2 ), and Pt/C (0.69 mA cm Pt -2 ), as well as most of documented HOR catalysts as indicated in Fig. 2d and Table S2 (online) [23,[38][39][40][41][42][43][44][45]. Similarly, linear fittings of micropolarization region (between -5 to +5 mV) via the approximate Butler-Volmer equation could also obtain the values of the exchange current densities [22], with 1.52 mA cm Ir À2 for IrWO x /C, 0.64 mA cm Ir À2 for Ir/C, and 0.66 mA cm Pt À2 for Pt/C, as shown in Fig.…”

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confidence: 98%

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Discrepant roles of adsorbed OH* species on IrWO for boosting alkaline hydrogen electrocatalysis

Yang

et al. 2020

Science Bulletin

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“…) and Ir/C (0.16 mA lg Ir À1 ) and most of the reported state-of-the-art HOR catalysts ( Fig. 2d and Table S2 online) [23,[38][39][40][41][42][43][44][45].…”

mentioning

confidence: 87%

mentioning

confidence: 98%

Discrepant roles of adsorbed OH* species on IrWO for boosting alkaline hydrogen electrocatalysis

Yang

et al. 2020

Science Bulletin

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“…1,2 Many researches have been done to synthesize non-Pt electrocatalysts for alkaline anion exchange membranes fuel cells with different materials including Pd, Ag, Ni, and Mn-oxides. [3][4][5][6] Among them, Ag is one of the most suitable non-Pt electrocatalyst candidate for the oxygen reduction reaction (ORR) in alkaline media, as Ag is not only about 50 times cheaper than Pt, but also stable at high pH in terms of its thermodynamics and electrochemistry. [7][8][9][10][11][12][13] However, an issue with the conventional method to form Ag nanoparticles (Ag NPs) is that the particles are large in size (7-500 nm) and are not well dispersed.…”

Section: Introductionmentioning

confidence: 99%

Facile preparation of a Ag/graphene electrocatalyst with high activity for the oxygen reduction reaction

Ren

Zhao

et al. 2020

RSC Adv.

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“…[ 12–15 ] Another strategy is dedicated to coupling Ir with transition metal (such as Ni, Co, Fe) to reduce the dosage of Ir and intensify electrochemical properties through modifying d band of Ir due to electron transfer. [ 16–18 ] In addition, designing the suitable morphology of catalysts by oleylamine‐assisted method to induce the interface effect and improve the ratio of active surfaces is also an important research direction. [ 19,20 ]…”

Section: Introductionmentioning

confidence: 99%

Ultrafine IrNi Bimetals Encapsulated in Zeolitic Imidazolate Frameworks‐Derived Porous N‐Doped Carbon for Boosting Oxygen Evolution in Both Alkaline and Acidic Electrolytes

Xiu

et al. 2020

Adv Materials Inter

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application of water splitting. The four electron reaction to form OO bond has caused high anodic potential in OER. [5,6] So far, Ir and Ru-derived composite are still the best metal catalysts for OER in acidic and alkaline condition on account of their excellent activity and supreme durability. Unfortunately, their further commercialization is obstructed by scarcity and high cost. [7,8] To break through the dilemma, a great deal of researches is focused on exploring low noble metal content electrocatalysts with high performance and good stability. [9-11] One is related to the metal nanoparticles supported on some metal oxides (such as TiO 2 , SiO 2) and carbonbased complex (g-C 3 N 4 , ZIF-67), which is in favor of increasing the specific surface area of catalysts and as a result, exposing more active sites. [12-15] Another strategy is dedicated to coupling Ir with transition metal (such as Ni, Co, Fe) to reduce the dosage of Ir and intensify electrochemical properties through modifying d band of Ir due to electron transfer. [16-18] In addition, designing the suitable morphology of catalysts by oleylamine-assisted method to induce the interface effect and improve the ratio of active surfaces is also an important research direction. [19,20] Currently, alloying Ir with 3d transition metals is generally regarded as feasible method to decrease the usage of Ir and meanwhile, increasing the catalytic activity through modifying the structure of Ir-based nanocrystals. [21,22] Hu et al. reported that Ir-Co binary oxide electrocatalyst is approximately two times more active compared with pure IrO 2 for OER. [23] Feng et al. discovered a general way to synthesis well-regulated IrM (MCo, Ni, CoNi) multi-metallic porous hollow nanocrystals (PHNCs). The IrCoNi PHNCs exhibited low cell voltage of 1.56 V at a current density of 2 mA cm −2 in 0.5 m H 2 SO 4 for overall water splitting. First-principles calculations revealed that Ir alloyed with 3d transition metals could induce ligand effect, which can weaken the adsorption energy of oxygen intermediates and bring about enhanced OER activity. [24] By reduction and galvanic replacement in different metals, Ir-Cu nanoframe was synthesized by Liang and Wang group, and Ir-Cu open nanostructures shows superior activity toward OER in 1 m KOH. [25] Although tremendous advance has been made in Ir-based nanocrystals, the challenges about its aggregation and relative low surface area should not be ignored. Developing cost-effective and active catalysts for oxygen evolution reaction (OER) towards renewable energy-related system, and applying the catalysts under both alkaline and acidic conditions is still a great challenge. In this work, a facile wet-chemical method is reported to synthesize ultrafine Ir x Ni y alloy encapsulated in porous N-doped carbon (BMNC) derived from bimetallic zeolitic imidazolate frameworks (ZIFs). Benefiting from the advantages of alloy effect between Ir and Ni, high surface area and more active site exposing, the optimal sample Ir 3 Ni 2 /BMNC with only 7.7 wt...

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One-pot synthesis of IrNi@Ir core-shell nanoparticles as highly active hydrogen oxidation reaction electrocatalyst in alkaline electrolyte

Cited by 81 publications

References 46 publications

Discrepant roles of adsorbed OH* species on IrWO for boosting alkaline hydrogen electrocatalysis

Discrepant roles of adsorbed OH* species on IrWO for boosting alkaline hydrogen electrocatalysis

Facile preparation of a Ag/graphene electrocatalyst with high activity for the oxygen reduction reaction

Ultrafine IrNi Bimetals Encapsulated in Zeolitic Imidazolate Frameworks‐Derived Porous N‐Doped Carbon for Boosting Oxygen Evolution in Both Alkaline and Acidic Electrolytes

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