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701.1 Electricity: Basic Concepts and Phenomena - 714.2 Semiconductor Devices and Integrated Circuits - 761 Nanotechnology - 801.4 Physical Chemistry - 802.2 Chemical Reactions - 804.2 Inorganic Compounds - 931.3 Atomic and Molecular Physics - 933 Solid State Physics

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The　two-step　fabrication　process　of　the　TCN/CoO　NP　is　shown　in　Fig.　1.　During　the　hydrothermal　pretreatment,　partial　melamine　was　hydrolyzed　and　converted　into　cyanuric　acid,　after　which　the　supramolecular　self-assembly　between　melamine　and　cyanuric　acid　generated　the　precursor　of　melamine–cyanurate　acid　(MCA)　hexagonal　microrod　[42,45].　Meanwhile,　the　amino　groups　of　melamine　are　capable　of　chelating　with　metal　ions　[46,47],　enabling　in　situ　growth　of　the　CoO　NP　on　the　surface　of　MCA　microrod　under　hydrothermal　condition.　As　a　result,　the　MCA　microrod-supported　CoO　NP　was　obtained.　In　the　subsequent　calcination　process,　the　CoO　NP　was　preserved,　while　the　MCA　microrod　was　converted　to　hollow　TCN,　thus　giving　the　TCN/CoO　NP　heterojunction.The　tubular　structure　of　TCN　is　well　preserved　after　introducing　the　cobalt　source　(Fig.　2b–1).　The　surface　of　TCN　is　no　longer　smooth　with　the　appearance　of　the　well-dispersed　NP　(Fig.　2b–2),　indicating　that　TCN　can　act　as　a　substrate　for　in　situ　growth　of　CoO　NP.　The　unique　architecture　of　TCN/CoO　NP　brings　many　benefits　for　PCR:　(1)　the　hollow　tubular　structure　has　large　specific　surface　area,　which　is　favorable　for　CO　adsorption;　(2)　thin　walls　of　TCN　shorten　the　carrier　transport　path　and　thus　allow　the　rapid　electron　transfer;　and　(3)　the　well-dispersed　CoO　NP　enables　the　high　exposure　of　metal　reactive　centers.　For　comparison,　the　pure　CoO　was　fabricated　in　the　absence　of　the　TCN　support.　Direct　calcination　of　CoCl·6HO　produced　bulk　CoO　with　an　octahedral　structure,　as　shown　in　Fig.　2c.　The　elemental　mapping　and　XRD　pattern　confirm　the　successful　fabrication　of　the　spinel　CoO　(Figs.　S2　and　S3).　The　size　of　bulk　CoO　can　be　larger　than　5　μm.　The　bulk　CoO　inevitably　minimizes　the　active　sites.　A　large　number　of　metal　sites　are　confined　in　the　interior　of　bulk　CoO　and　have　the　inability　to　participate　in　PCR.　The　analysis　results　demonstrate　that　TCN　substrate　is　effective　to　load　and　disperse　CoO　NP.This　work　was　supported　by　the　National　Key　Research　and　Development　Program　of　China　(2020YFA0710303),　National　Natural　Science　Foundation　of　China　(52002072,　U1905215,　52072076)　and　Natural　Science　Foundation　of　Fujian　Province　(2021J01589).

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EI:20223912785213

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English

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