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Amorphous WO3 induced lattice distortion for a low-cost and high-efficient electrocatalyst for overall water splitting in acid
Wuhan Univ Technol, State Key Lab Adv Technol Mat Synth & Proc, Wuhan 430070, Peoples R China.;DUT, DUT KTH Joint Educ & Res Ctr Mol Devices, Inst Energy Sci & Technol, State Key Lab Fine Chem,Inst Artificial Photosynt, Dalian 116024, Peoples R China..ORCID iD: 0000-0003-2269-4042
Wuhan Univ Technol, State Key Lab Adv Technol Mat Synth & Proc, Wuhan 430070, Peoples R China..
Stockholm Univ, Dept Mat & Environm Chem, S-10691 Stockholm, Sweden..
Wuhan Univ Technol, State Key Lab Adv Technol Mat Synth & Proc, Wuhan 430070, Peoples R China..
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2020 (English)In: Sustainable Energy & Fuels, ISSN 2398-4902, Vol. 4, no 4, p. 1712-1722Article in journal (Refereed) Published
Abstract [en]

The development of highly active and durable catalysts for water oxidation under acidic conditions is necessary but challenging for renewable energy conversion. Ir-based catalysts are highly efficient for water oxidation in acid, but their large scale application is hindered by the high cost and scarcity of iridium. Herein, we use an amorphous WO3 induced lattice distortion (AWILD) strategy to reduce the Ir content to only 2 wt% in the final material. The optimized hybrid nitrogen-doped carbon (NC)/WO3/IrO2 can efficiently catalyze water oxidation with a low overpotential of 270 mV at 10 mA cm(-2) current density (eta (10)) and a high turnover frequency of over 2 s(-1) at 300 mV overpotential in 0.5 M H2SO4, a performance that surpasses that of commercial IrO2 significantly. Introducing the layer of amorphous WO3 between IrO2 nanoparticles and NC can distort the lattice of IrO2, exposing more highly active sites for water oxidation. The AWILD effect compensates for the lower Ir content and dramatically reduces the cost of the catalyst without sacrificing the catalytic activity. Additionally, this catalyst also exhibits high activity in acid for hydrogen evolution with only 65 mV of eta (10) attributed to the AWILD effect, exhibiting efficient bifunctionality as a Janus catalyst for overall water splitting. The AWILD approach provides a novel and efficient strategy for low-cost and highly efficient electrocatalysts for acidic overall water splitting with an extremely low content of noble metals.

Place, publisher, year, edition, pages
ROYAL SOC CHEMISTRY , 2020. Vol. 4, no 4, p. 1712-1722
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Organic Chemistry
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URN: urn:nbn:se:kth:diva-273111DOI: 10.1039/c9se01282fISI: 000526855200013Scopus ID: 2-s2.0-85082736810OAI: oai:DiVA.org:kth-273111DiVA, id: diva2:1429562
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QC 20200511

Available from: 2020-05-11 Created: 2020-05-11 Last updated: 2020-05-11Bibliographically approved

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Fan, LizhouZhang, BiaobiaoSun, Licheng

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