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dc.contributor.authorSumboja, Afriyantien_US
dc.contributor.authorChen, Jingweien_US
dc.contributor.authorMa, Yuanyuanen_US
dc.contributor.authorXu, Yijieen_US
dc.contributor.authorZong, Yunen_US
dc.contributor.authorLee, Pooi Seeen_US
dc.contributor.authorLiu, Zhaolinen_US
dc.identifier.citationSumboja, A., Chen, J., Ma, Y., Xu, Y., Zong, Y., Lee, P. S. & Liu, Z. (2019). Sulfur-rich colloidal nickel sulfides as bifunctional catalyst for all-solid-state, flexible and rechargeable Zn-air batteries. ChemCatChem, 11(4), 1205-1213.
dc.description.abstractEarth-abundant and high-performance catalysts for oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) are highly desirable in development of energy-efficient rechargeable Zn-air batteries. In this work, sulfur-rich colloidal nickel sulfides (NiSₓ) are prepared as OER/ORR bifunctional catalysts via a two-step hydrothermal process. The NiSₓ nanoparticles (NPs) with large surface area show high OER activity and excellent stability, as evidenced by low overpotential of 301 mV, small Tafel slope of 41 mV dec⁻¹ and high stability over 20 h of chronopotentiometry test. Due to their sulfur-rich nature (i. e. Ni₃S₄ and NiS₂), the obtained NiSₓ also exhibit good ORR activity. The introduction of graphene oxide (GO) in the starting materials leads to the formation of a composite catalyst composed of conductive sulfur-doped reduced graphene oxide (S-rGO) and NiSₓ. A high ORR onset potential of 0.91 V (vs. RHE) is obtained from the sulfur-rich NiSₓ NPs coupled with the S-rGO which facilitates the electron-transfer and furnishes the bifunctional catalytic activity. Rechargeable Zn-air batteries with NiSₓ/S-rGO bifunctional catalyst deliver stable charge and discharge voltages of 2.1 and 1.1 V over 590 cycles. Furthermore, all-solid-state and foldable Zn-air batteries using pliable and robust air cathodes of NiSₓ/S-rGO show similar voltage profile as their non-foldable counterparts. The foldable batteries exhibit stable cycling performance for up to 120 discharge/charge cycles at either flat or folded state, proving their high electrochemical and mechanical stability.en_US
dc.description.sponsorshipAgency for Science, Technology and Research (A*STAR)en_US
dc.rights© 2019 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim. All rights reserved.en_US
dc.titleSulfur-rich colloidal nickel sulfides as bifunctional catalyst for all-solid-state, flexible and rechargeable Zn-air batteriesen_US
dc.typeJournal Articleen
dc.contributor.schoolSchool of Materials Science and Engineeringen_US
dc.contributor.organizationSingapore-HUJ Alliance for Research and Enterprise (SHARE)en_US
dc.contributor.organizationNanomaterials for Energy and Water Nexus (NEW)en_US
dc.contributor.organizationCampus for Research Excellence and Technological Enterprise (CREATE)en_US
dc.subject.keywordsZinc-air Batteriesen_US
dc.subject.keywordsNickel Sulfidesen_US
dc.description.acknowledgementThis research was supported by the Advanced Energy Storage Research Programme (IMRE/12-2P0503 and IMRE/12-2P0504), Institute of Materials Research and Engineering of the Agency for Science, Technology and Research, Singapore.en_US
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