PtIr/Ti4O7 as a bifunctional electrocatalyst for improved oxygen reduction and oxygen evolution reactions

Won, Ji-Eun; Kwak, Da-Hee; Han, Sang-Beom; Park, Hyun-Suk; Park, Jin‐Young; Ma, Kyeng-Bae; Kim, Do-Hyoung; Park, Kyung-Won

doi:10.1016/j.jcat.2017.12.013

Cited by 66 publications

(27 citation statements)

References 70 publications

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“…Therefore, numerous scientific research efforts have been devoted to investigating and designing efficient noble metal nanocatalysts with high electrocatalytic activity, long-term stability and the use of non-noble metals. Alloying Ir with transition group metals [19,[24][25][26][27][28][29][30][31][32][33][34] is generally regarded as an effective strategy that not only substantially reduces the usage of Ir but also facilitates the catalytic activity and stability for water splitting by tuning the d-band structure and oxygen adsorption energy on the surface of Ir. Another strategy to optimize the overall catalytic activity is to tune the geometric shape of the nanocatalysts [18,[35][36][37][38][39][40][41][42].…”

Section: Introductionmentioning

confidence: 99%

Hierarchical iridium-based multimetallic alloy with double-core-shell architecture for efficient overall water splitting

et al. 2019

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The overall water splitting for hydrogen production is an effective strategy to resolve the environmental and energy crisis. Here, we report a facile approach to synthesize the Ir-based multimetallic, hierarchical, double-coreshelled architecture (HCSA) assisted by oil bath reaction for boosting overall water splitting in acidic environment. The IrNiCu HCSA shows superior electrocatalytic activity for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER), which are comparable to commercial Pt/C and better than IrO 2. The IrNiCu HCSA exhibits remarkably catalytic efficiency as bifunctional catalyst for overall water splitting where a low cell voltage of 1.53 V is enough to drive a current density of 10 mA cm −2 and maintains stable for at least 20 h. The presented work for the design and synthesis of novel Ir-based multimetallic architecture paves the way for highperformance overall water splitting catalysis.

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Section: Introductionmentioning

confidence: 99%

Hierarchical iridium-based multimetallic alloy with double-core-shell architecture for efficient overall water splitting

et al. 2019

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“…This is typical of Pt-Ir bimetallic alloys due to ensemble-size effect [32]. Moreover, in the wide angle XRD, the peak position of (2 2 0) for PtIr-TiC was positively shifted, it could be an indication of the alloy formation of PtIr [33]. A wideangle pattern of PtIr-CMK-3 [13] was added for comparison purpose.…”

Section: Xrdmentioning

confidence: 99%

Influence of Ti Incorporation to Bimetallic Mesoporous Carbon in the Production of 2,5-Dimethylfuran from Biomass Derivatives

et al. 2021

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Monometallic and bimetallic supported catalysts were developed to produce 2,5-dimethylfuran (DMF) trough hydrogenolysis of 5-(hydroxymethyl)furfural (HMF). Detailed physicochemical characterization was done to understand structure-activity correlation. Through a series of experiments and comparatives tests, the synergistic effect among Pt, Ir, and Ti incorporated in the support was investigated. Results revealed that using the titanium contained ordered mesoporous carbon, synthesized by a novel technique, high selectivity to DMF was achieved. In the case of the best catalyst PtIr-TiC, the good activity and excellent selectivity to the desired product DMF (98% yield) was related to the high hydrogenating capacity of the bimetallic sites, the acid support characteristics and the high metal nanoparticles dispersion achieved on the mesoporous titanium modified carbon support.

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“…Pt and its alloys are still the most active catalysts for ORR in acidic media, but they only show moderate activity for OER. In acidic media this has been solved by the use of Pt/IrO 2 and RuO 2 mixtures [6][7][8][9][10][11][12], but the high cost of platinum group metals and their poor stability have hindered their application in commercial devices. In recent years, the use of alkaline membranes in water electrolysers and fuel cells has promoted the study of new non-noble metals as catalysts due to their enhanced kinetics at higher pH.…”

Section: Introductionmentioning

confidence: 99%

CoTiO3/NrGO nanocomposites for oxygen evolution and oxygen reduction reactions: Synthesis and electrocatalytic performance

Luque-Centeno

Martı́nez-Huerta

Sebastián

et al. 2020

Electrochimica Acta

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Oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) catalysts play an important role in energy conversion and storage devices, but highly active and robust nonprecious metal catalysts are required to address the cost and durability issues. In this work, a modified gel methodology has been used to obtain nanocomposites of perovskite CoTiO 3 and N-doped reduced graphene oxide (NrGO). Moreover, the influence of the annealing extent in the synthesis has been studied. The composites show higher activity in oxygen evolution and reduction reactions in alkaline environment compared to sole ilmenite, which is related to a strong interaction between cobalt titanate and NrGO carbon matrix. The annealing duration appears as a key variable to modulate the physicochemical properties and the electrochemical behavior. The composite prepared at the largest duration (3 hours) exhibit enhanced bifunctional properties for ORR and OER, with onset potentials of 0.93 V and 1.53 V vs. RHE respectively, which is mainly attributed to higher concentration of nitrogen, larger extent of defects and/or the presence of more oxidized Co species in the nanocomposite.

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PtIr/Ti4O7 as a bifunctional electrocatalyst for improved oxygen reduction and oxygen evolution reactions

Cited by 66 publications

References 70 publications

Hierarchical iridium-based multimetallic alloy with double-core-shell architecture for efficient overall water splitting

Hierarchical iridium-based multimetallic alloy with double-core-shell architecture for efficient overall water splitting

Influence of Ti Incorporation to Bimetallic Mesoporous Carbon in the Production of 2,5-Dimethylfuran from Biomass Derivatives

CoTiO3/NrGO nanocomposites for oxygen evolution and oxygen reduction reactions: Synthesis and electrocatalytic performance

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