Activated TiO2 with tuned vacancy for efficient electrochemical nitrogen reduction

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dc.contributor.authorHan, Zishanko
dc.contributor.authorChoi, Changhyeokko
dc.contributor.authorHong, Songko
dc.contributor.authorWu, Tai-Singko
dc.contributor.authorSoo, Yun-Liangko
dc.contributor.authorJung, Yousungko
dc.contributor.authorQiu, Jieshanko
dc.contributor.authorSun, Zhenyuko
dc.date.accessioned2019-09-03T03:20:02Z-
dc.date.available2019-09-03T03:20:02Z-
dc.date.created2019-09-02-
dc.date.issued2019-11-
dc.identifier.citationAPPLIED CATALYSIS B-ENVIRONMENTAL, v.257-
dc.identifier.issn0926-3373-
dc.identifier.urihttp://hdl.handle.net/10203/266595-
dc.description.abstractRenewable energy-driven electrochemical N-2 reduction reaction (NRR) provides a green and sustainable route for NH3 synthesis under ambient conditions but is plagued by a high reaction barrier and low selectivity. To promote NRR, modification of the catalyst surface to increase N-2 adsorption and activation is key. Here, we show that engineering surface oxygen vacancies of TiO2 permits significantly enhanced NRR activity with an NH3 yield rate of about 3.0 mu g(NH3)h(-)(1 )mg(cat.)(-1) and a faradaic efficiency (FE) of 6.5% at -0.12 V (vs. the reversible hydrogen electrode, RHE). Efficient conversion of N-2 to NH3 is achieved in a wide applied potential range from -0.07 to -0.22 V (vs. RHE) with NH3 production rates >= 2.0 RgNH(3 )mu g(NH3)h(-)(1 )mg(cat.)(-1) and NH3 FEs >= 4.9%, respec- tively. An NH3 FE as high as 9.8% is obtained at a low overpotential of 80 mV. Density functional theory calculations reveal that the surface oxygen vacancies in TiO2 play a vital role in facilitating electrochemical N-2 reduction by activating the first protonation step and also increasing N-2 chemisorption (relative to *H).-
dc.languageEnglish-
dc.publisherELSEVIER-
dc.titleActivated TiO2 with tuned vacancy for efficient electrochemical nitrogen reduction-
dc.typeArticle-
dc.identifier.wosid000480669500038-
dc.identifier.scopusid2-s2.0-85068864597-
dc.type.rimsART-
dc.citation.volume257-
dc.citation.publicationnameAPPLIED CATALYSIS B-ENVIRONMENTAL-
dc.identifier.doi10.1016/j.apcatb.2019.117896-
dc.contributor.localauthorJung, Yousung-
dc.contributor.nonIdAuthorHan, Zishan-
dc.contributor.nonIdAuthorChoi, Changhyeok-
dc.contributor.nonIdAuthorHong, Song-
dc.contributor.nonIdAuthorWu, Tai-Sing-
dc.contributor.nonIdAuthorSoo, Yun-Liang-
dc.contributor.nonIdAuthorQiu, Jieshan-
dc.contributor.nonIdAuthorSun, Zhenyu-
dc.description.isOpenAccessN-
dc.type.journalArticleArticle-
dc.subject.keywordAuthorAmmonia-
dc.subject.keywordAuthorElectrochemistry-
dc.subject.keywordAuthorN-2 reduction-
dc.subject.keywordAuthorOxygen vacancy-
dc.subject.keywordAuthorTiO2-
dc.subject.keywordPlusELECTROCATALYTIC N-2 REDUCTION-
dc.subject.keywordPlusCARBON NITRIDE NANOSHEETS-
dc.subject.keywordPlusOXYGEN VACANCIES-
dc.subject.keywordPlusPHOTOCATALYTIC REDUCTION-
dc.subject.keywordPlusATMOSPHERIC-PRESSURE-
dc.subject.keywordPlusAMBIENT CONDITIONS-
dc.subject.keywordPlusAMMONIA-
dc.subject.keywordPlusDINITROGEN-
dc.subject.keywordPlusFIXATION-
dc.subject.keywordPlusWATER-
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