《Table S1BET test of Na Ta O3‐based photocatalysts.》

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《光诱导双助催化剂在半导体表面的自发形成（英文）》

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Two types of Na Ta O3 nanocrystals were synthesized with anisotropic facets（26‐facet Na Ta O3）and isotropic facets（6‐facet Na Ta O3）[21].Photodeposition method can be used to determine the distribution of photogenerated electrons and holes[22].For 26‐facet Na Ta O3（Fig.1），most Pt particles were selectively deposited on{001}facets while majority Co3O4 par‐ticles only appeared on{011}and{111}facets，suggesting that photogenerated electrons and holes can be spatially separated between different facets of Na Ta O3 nanocrystals.It shows that both Pt and Co3O4 particles are all randomly deposited on all the facets of 6‐facet Na Ta O3（Fig.S1），indicating that the pho‐togenerated electrons and holes are randomly distributed on every facet.The two types of nanocrystals possess similar crystalline structures（Fig.S2），light absorption properties（Fig.S3）and surface areas etc.（Table S1）.Therefore，it is feasible to investigate the chemical states of nickel‐based cocatalysts ac‐cording to the spatial charge separation.Fig.1（c）shows the shape‐controlled growth of 26‐facet Na Ta O3 nanocrystals，with smooth facet and regular morphology，exposed with{001}，{011}and{111}facets.Fig.1（d）and Fig.S1（c）show 26‐facet Na Ta O3 and 6‐facet Na Ta O3 schematically.EDS of Pt or Co3O4 deposited on 26‐facet Na Ta O3 are shown in Fig.S4，but part of the element Pt signal was obscured by the signal of element Ta.Therefore，XPS of Pt or Co3O4 deposited on 26‐facet Na Ta O3 are shown in Fig.S5.Pt 4f in XPS revealed that the deposited ele‐ment was in the metallic form.According to the binding energy of Co 2p in XPS，the specie can be ascribed to Co3O4.The influ‐ence of different facet structure was verified by a traditional impregnation method.This method is based on the surface structure and adsorption factor.The nanoparticles are distrib‐uted on all the facets of 26‐facet Na Ta O3 randomly by impreg‐nation method（Fig.S6）.However，in photodeposition method，two different nanoparticles are distributed on the surface of26‐facet Na Ta O3 spatially.Therefore，this impregnation method has relatively weak influence by different facet structures when compared with photodeposition method.