An oxygen evolution catalyst on an antimony doped tin oxide nanowire structured support for proton exchange membrane liquid water electrolysis

Liu, Gaoyang; Xu, Junyuan; Wang, Yituo; Wang, Xindong

doi:10.1039/c5ta02942b

Cited by 86 publications

(98 citation statements)

References 78 publications

(17 reference statements)

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“…Of the investigated oxides, mesoporous ATO ( meso ‐ATO) showed the highest conductivity (0.29 S cm −1 ) and a highly stable cyclability (>10 000 cycles) . Similar results (0.83 S cm −1 ) were reported for electrospun crystalline ATO nanowires (nws) . The outstanding stability of IrO 2 nanodendrites and IrNi oxide core–shell particles mentioned in Section 4.3 is further improved when supported on nanostructured ATO ,.…”

Section: Degradation Mechanisms and Mitigation Strategiessupporting

confidence: 64%

The Stability Challenges of Oxygen Evolving Catalysts: Towards a Common Fundamental Understanding and Mitigation of Catalyst Degradation

et al. 2017

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This Review addresses the technical challenges, scientific basis, recent progress, and outlook with respect to the stability and degradation of catalysts for the oxygen evolution reaction (OER) operating at electrolyzer anodes in acidic environments with an emphasis on ion exchange membrane applications. First, the term "catalyst stability" is clarified, as well as current performance targets, major catalyst degradation mechanisms, and their mitigation strategies. Suitable in situ experimental methods are then evaluated to give insight into catalyst degradation and possible pathways to tune OER catalyst stability. Finally, the importance of identifying universal figures of merit for stability is highlighted, leading to a comprehensive accelerated lifetime test that could yield comparable performance data across different laboratories and catalyst types. The aim of this Review is to help disseminate and stress the important relationships between structure, composition, and stability of OER catalysts under different operating conditions.

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Section: Degradation Mechanisms and Mitigation Strategiessupporting

confidence: 64%

The Stability Challenges of Oxygen Evolving Catalysts: Towards a Common Fundamental Understanding and Mitigation of Catalyst Degradation

et al. 2017

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“…This finding is in contrastw ith the often reported stable but poor OER performance of crystalline IrO 2 -based compounds produced through more classical calcination routes. [14] In addition to optimized catalyst morphology by dispersion of Ir particles on as uitable support, producingt he "right" chemicals tate of Ir is no less critical to the OER performance of the catalytic system.E arly electrochemical studies showed that metallici ridium is inefficient in OER and needs to be activated under oxidative conditions. anodic potentials in chlorine-free acidic electrolytes.…”

Section: Introductionmentioning

confidence: 99%

High‐Performance Supported Iridium Oxohydroxide Water Oxidation Electrocatalysts

et al. 2017

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The synthesis of a highly active and yet stable electrocatalyst for the anodic oxygen evolution reaction (OER) remains a major challenge for acidic water splitting on an industrial scale. To address this challenge, we obtained an outstanding high-performance OER catalyst by loading Ir on conductive antimony-doped tin oxide (ATO)-nanoparticles by a microwave (MW)-assisted hydrothermal route. The obtained Ir phase was identified by using XRD as amorphous (XRD-amorphous), highly hydrated Ir oxohydroxide. To identify chemical and structural features responsible for the high activity and exceptional stability under acidic OER conditions with loadings as low as 20 μg cm , we used stepwise thermal treatment to gradually alter the XRD-amorphous Ir phase by dehydroxylation and crystallization of IrO . This resulted in dramatic depletion of OER performance, indicating that the outstanding electrocatalytic properties of the MW-produced Ir oxohydroxide are prominently linked to the nature of the produced Ir phase. This finding is in contrast with the often reported stable but poor OER performance of crystalline IrO -based compounds produced through more classical calcination routes. Our investigation demonstrates the immense potential of Ir oxohydroxide-based OER electrocatalysts for stable high-current water electrolysis under acidic conditions.

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“…The Tafel slope for the conventional catalyst at E < 1.43 V was 63 mV, which is close to the 60 mV slope commonly reported for IrO 2 -based electrodes in sulfuric acid solution. 14,18,19,32 The stability test of the IrO x /Nb-SnO 2 catalyst during constant current OER was carried out preliminary in air-saturated 0.1 M HClO 4 solution at 80…”

Section: Electrochemical Characterization Of Iromentioning

confidence: 99%

“…The OER activities of iridium and/or ruthenium oxide nanoparticle (or nanodendrite) catalysts supported on antimony-doped tin oxide (Sb-SnO 2 ), which exhibited a relatively high electronic conductivity, have been examined by several groups. [14][15][16][17][18][19] However, to our knowledge, the microstructures of neither the noble metal catalysts nor the supports have been controlled at the nanoscale.…”

mentioning

confidence: 99%

Remarkable Mass Activities for the Oxygen Evolution Reaction at Iridium Oxide Nanocatalysts Dispersed on Tin Oxides for Polymer Electrolyte Membrane Water Electrolysis

Ohno

Nohara

Kakinuma

et al. 2017

J. Electrochem. Soc.

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In order to reduce the amount of noble metal catalysts for the oxygen evolution reaction (OER) in polymer electrolyte membrane water electrolysis (PEMWE) while maintaining high efficiency, we synthesized new catalysts: IrO x nanoparticles dispersed on Nb-SnO 2 and Ta-SnO 2 supports with fused-aggregate structures. IrO x nanoparticles with a uniform size of ca. 2 nm were highly dispersed on these supports. The OER activities were evaluated by linear sweep voltammetry (LSV) in 0.1 M HClO 4 at 80 • C using a channel flow electrode cell. The IrO x /Ta-SnO 2 catalysts exhibited an apparent mass activity (MA) of 15 A mg Ir -1 for the OER at 1.5 V vs. RHE, which was 32 times higher than that of a conventional catalyst (mixture of Pt black and IrO 2 powders). This suggests a possible reduction of the loading of the noble metal anode catalyst to a level as low as 0.1 mg cm −2 at a voltage efficiency of 90% at 1 A cm −2 . © The Author Renewable energy sources such as solar and wind powers are sustainable alternatives to fossil fuels, although the electricity generation from such sources is intermittent in nature. Thus, the conversion and storage of surplus renewable electricity to other forms of energy are required for leveling of their large output fluctuations. Water electrolysis makes it possible to produce high purity hydrogen from renewable electric power and thus to level the output fluctuations when combined with stationary fuel cells. Polymer electrolyte membrane water electrolysis (PEMWE) has received much attention because of advantages such as high energy conversion efficiency, even at high current densities, and a compact system with easy maintenance and start-up and shut-down, 1-3 compared to alkaline 4 and solid oxide electrolysis, 5 leading to the feasibility of on-site hydrogen production. Nevertheless, conventional PEMWE cells are very expensive due to their use of a large amount of noble metals such as Pt and/or Ir as electrocatalysts (2 mg Pt+Ir cm −2 or more in each electrode), in addition to their use of costly polymer electrolyte membranes. 3,6 To solve the catalyst problem, one possible approach is to use nano-sized catalysts highly dispersed on support materials in place of noble metal blacks with large particle sizes, typically over 50 nm. For the support material at the anode, high durability at the high potentials of the oxygen evolution reaction (OER) under acidic conditions is required. Carbon supports, which have been commonly used in polymer electrolyte fuel cells (PEFCs), cannot be used due to the severe corrosion at such high potentials. 7,8 Tin oxide, 9 titanium oxide, 10,11 titanium carbide, 12 and silicon carbide-silicon, 13 among others, have been examined as supports for noble metal catalysts for the OER. The OER activities of iridium and/or ruthenium oxide nanoparticle (or nanodendrite) catalysts supported on antimony-doped tin oxide (Sb-SnO 2 ), which exhibited a relatively high electronic conductivity, have been examined by several groups.14-19 However, to our knowledge, the micros...

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An oxygen evolution catalyst on an antimony doped tin oxide nanowire structured support for proton exchange membrane liquid water electrolysis

Abstract: Porous Sb–SnO2 nanowires were synthesized as a support for IrO2 by an electrospinning method. The thus prepared catalyst exhibits enhanced mass activity toward OER.

Cited by 86 publications

References 78 publications

The Stability Challenges of Oxygen Evolving Catalysts: Towards a Common Fundamental Understanding and Mitigation of Catalyst Degradation

The Stability Challenges of Oxygen Evolving Catalysts: Towards a Common Fundamental Understanding and Mitigation of Catalyst Degradation

High‐Performance Supported Iridium Oxohydroxide Water Oxidation Electrocatalysts

Remarkable Mass Activities for the Oxygen Evolution Reaction at Iridium Oxide Nanocatalysts Dispersed on Tin Oxides for Polymer Electrolyte Membrane Water Electrolysis

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