The in-plane heterojunctions with atomic-level thickness and chemical-bond-connected tight interfaces possess high carrier separation efficiency and fully exposed surface active sites, thus exhibiting exceptional photocatalytic performance. However, the construction of in-plane heterojunctions remains a significant challenge. Herein, we prepared an in-plane ZnInS/In(OH) heterojunction (ZISOH) by partial conversion of ZnInS to In(OH) through the addition of HO. This oxidation etching-hydrolysis approach enables the ZISOH heterojunction to not only preserve the original nanosheet morphology of ZnInS but also form an intimate interface. Moreover, generated In(OH) serves as an electron-accepting platform and also promotes the adsorption of CO. As a result, the heterojunction exhibits a remarkably enhanced performance for photocatalytic CO reduction. The production rate and selectivity of CO reach 1760 μmol g h and 78%, respectively, significantly higher than those of ZnInS (842 μmol g h and 65%). This work puts forward a feasible and facile approach to construct in-plane heterojunctions to enhance the photocatalytic performance of two-dimensional metal sulfides.
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