An effective oxygen electrode based on Ir0.6Sn0.4O2 for PEM water electrolyzers

Jiang, Guang; Yu, Hongmei; Hao, Jinkai; Chen, Jun; Fan, Zhixuan; Yao, Dewei; Qin, Bowen; Shao, Zhigang

doi:10.1016/j.jechem.2019.01.011

Cited by 33 publications

(22 citation statements)

References 36 publications

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“…(a) Polarization curves, (b) EISs at 1.5 V at 80 °C with the Nafion 115 membrane and the cathode of 0.4 mg Pt cm –2 , (c) Polarization curves with iR -free, and (d) Tafel curves by comparing with spraying CCM based on commercial Ir black (0.5 mg Ir cm –2 ). (e) Summary of cell performances and (f) mass activities at 1.7 V in the studies ,− tested at a condition of 80 °C and Nafion 115 membrane.…”

Section: Results and Discussionmentioning

confidence: 99%

Low-Loading and Highly Stable Membrane Electrode Based on an Ir@WO_xNR Ordered Array for PEM Water Electrolysis

Jiang

et al. 2021

ACS Appl. Mater. Interfaces

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Developing cheap and stable membrane electrode assembly for proton exchange membrane water electrolysis (PEMWE) plays critical roles in renewable energy revolution. Iridium is the commonly efficient oxygen evolution reaction catalyst. But the reserve in earth is a shortage. Herein, an ordered array electrode in feature of the defective Ir film decorated on external WO x nanorods (WO x NRs) is designed. Electrodeposition is carried out to prepare an iridium coating (∼68 nm in thickness) to guarantee the ordered morphology. This novel electrode obtained brilliant I−V performances (2.2 A cm −2 @2.0 V) and 1030 h stability (0.5 mA cm −2 ) with a reduced loading of 0.14 mg Ir cm −2 . The uniform dispersion Ir catalyst on the WO x substrate benefits to enhance Ir mass activity and improve the poor conductivity originating from WO x . Compared with that of sprayed electrode, the threshold current density of mass transport polarization region can be expande to at least 3.0 A cm −2 for ordered structure electrode attributed to the abundant water storage bulk. This novel Ir@WO x NRs electrode occupies a huge potential to defuse the cost and durability issues confronting with the PEMWE.

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Section: Results and Discussionmentioning

confidence: 99%

Low-Loading and Highly Stable Membrane Electrode Based on an Ir@WO_xNR Ordered Array for PEM Water Electrolysis

Jiang

et al. 2021

ACS Appl. Mater. Interfaces

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“…Moreover, the Ir(0) 4f 7/2 and 4f 5/2 peaks of IrRu at 61.27 and 64.27 eV, respectively, − positively shift 0.10 eV as compared to that of homemade Ir as shown in Figure e. This peak shift is an indication of electron donation from Ir when it is alloyed with Ru.…”

Section: Resultsmentioning

confidence: 86%

Ultrafine IrRu Nanoparticles toward Efficient Oxygen Evolution Reaction in Acidic Media

Sun

Qin

et al. 2022

Inorg. Chem.

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Proton exchange membrane water electrolyzers (PEMWEs) are capable of mass-producing green hydrogen with renewable and wave-trough electricity, but confront the challenge of the lack of advanced electrocatalysts to accelerate sluggish oxygen evolution reaction (OER). Herein, we report the synthesis of ultrafine IrRu alloy nanoparticles (1.6 ± 0.3 nm) by coprecipitation of IrCl3, RuCl3, and HCOONa in water to allow Ir3+ and Ru3+ to be well dispersed and enclosed in the matrix of crystalline HCOONa, followed by heat treatment of HCOONa to reduce Ir3+ and Ru3+. Remarkably, the overpotential of IrRu toward acidic OER at 10 mA cm–2 is merely 230 and 194 mV at 51 and 204 μgIrRu cm–2, respectively. The high electrochemically active surface area (ECSA) of 577.1 m2 g–1 and high specific activity (SA) of 22.7 μA cm–2 at 1.45 V vs RHE would contribute to the exceptional OER activity. In addition, the electron transfer from Ir to Ru in IrRu should significantly boost the OER activity according to X-ray photoelectron spectroscopy (XPS). IrRu also shows an excellent stability during 10 h of a chronopotentiometry (CP) test at 10 mA cm–2. Eventually, the high OER activity of IrRu was verified in a PEMWE.

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“…6 Jiang et al have designed Ir 0.6 Sn 0.4 O 2 anode materials because of their smaller particle size, and the dropping of Sn atoms contributes to an increase in the Ir mass activity, which leads to an effective OER performance. 7 Perovskite oxides are well-known for past few decades having the common formula of ABO 3 with excellent physical, chemical, and catalytic properties. 8 A sites were usually rareearth, alkaline-earth, or p-block elements, and B sites were typically occupied by transition elements.…”

Section: ■ Introductionmentioning

confidence: 99%

“…Surface defects with highly scattered active sites will have a strong tendency toward reactants and facilitate the optimistic adsorption and desorption of oxygen moieties during OER . Jiang et al have designed Ir 0.6 Sn 0.4 O 2 anode materials because of their smaller particle size, and the dropping of Sn atoms contributes to an increase in the Ir mass activity, which leads to an effective OER performance …”

Section: Introductionmentioning

confidence: 99%

Rational Design of Highly Efficient Perovskite Hydroxide for Electrocatalytic Water Oxidation

et al. 2020

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The production of hydrogen from ecofriendly renewable technologies like water electrolysis and fuel cells involves oxygen evolution reaction (OER), which plays a major role, but the slow kinetics of OER is a bottleneck of commercialization of such technologies. Herein, we have reported the formation of an efficient OER catalyst from SnCo(OH) 6 (SCH) by leaching of Sn atoms during electrochemical OER studies. According to density functional theory calculations, adsorption of OH* species on Sn atoms is energetically more favorable than that of Co atoms, and as a result, highly active CoOOH is generated by leaching of Sn atoms from surface layers. We observed enhanced OER performance with superior mass activity by blending SCH with activated charcoal, which displays a low overpotential of 293 mV and higher mass activity than that of pristine SCH. More importantly, it outperforms Co(OH) 2 and RuO 2 having the same carbon composition because of the formation of thermodynamically stable and amorphous CoOOH on the surface of single-crystalline SCH and strong tethering ability of activated charcoal.

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An effective oxygen electrode based on Ir0.6Sn0.4O2 for PEM water electrolyzers

Cited by 33 publications

References 36 publications

Low-Loading and Highly Stable Membrane Electrode Based on an Ir@WO_xNR Ordered Array for PEM Water Electrolysis

Low-Loading and Highly Stable Membrane Electrode Based on an Ir@WO_xNR Ordered Array for PEM Water Electrolysis

Ultrafine IrRu Nanoparticles toward Efficient Oxygen Evolution Reaction in Acidic Media

Rational Design of Highly Efficient Perovskite Hydroxide for Electrocatalytic Water Oxidation

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An effective oxygen electrode based on Ir0.6Sn0.4O2 for PEM water electrolyzers

Cited by 33 publications

References 36 publications

Low-Loading and Highly Stable Membrane Electrode Based on an Ir@WOxNR Ordered Array for PEM Water Electrolysis

Low-Loading and Highly Stable Membrane Electrode Based on an Ir@WOxNR Ordered Array for PEM Water Electrolysis

Ultrafine IrRu Nanoparticles toward Efficient Oxygen Evolution Reaction in Acidic Media

Rational Design of Highly Efficient Perovskite Hydroxide for Electrocatalytic Water Oxidation

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Low-Loading and Highly Stable Membrane Electrode Based on an Ir@WO_xNR Ordered Array for PEM Water Electrolysis

Low-Loading and Highly Stable Membrane Electrode Based on an Ir@WO_xNR Ordered Array for PEM Water Electrolysis