Huihui Zhang,Huajun Gu,Xiaohao Wang,Lingfeng Li,Juhua Zhang,Shengyuan Chang,Wei-Lin Dai
Enhancing the interfacial charge carriers transfer efficiency is important for designing photocatalysts with excellent hydrogen evolution performance. In this work, we have successfully constructed a In 2 O 3 @InN/ZnIn 2 S 4 ternary heterostructure by embedding InN at the interface of thin-layered ZnIn 2 S 4 and tubular In 2 O 3 derived from metal-organic frameworks (MOFs) nanorods for the first time. The InN can not only adjust the energy band structure of In 2 O 3 , but also boost the photogenerated charge carriers transfer at the interface of In 2 O 3 and ZnIn 2 S 4 . The optimum photocatalytic hydrogen evolution rate of In 2 O 3 @InN/ZnIn 2 S 4 composite reaches 275 µmol/h (50 mg of catalyst) under simulated sunlight irradiation, which is obviously higher than pure In 2 O 3 (12.5 times), ZnIn 2 S 4 (2.5 times) and binary In 2 O 3 /ZnIn 2 S 4 (1.8 times) photocatalysts. This work can offer a meaningful strategy to promote the interfacial charge separation in the heterostructure for excellent photocatalytic hydrogen evolution activity.
Yiguang Gai,Dong Tian,Zhishan Li,Guanghao Wang,Wenli Kang,Hua Wang,Kongzhai Li
Electroreduction of CO 2 into beneficial products is integral to attaining carbon neutrality. Herein, we detail a series of anti-perovskite nitrides InNNi 3− x V x ( x = 0, 0.2, 0.4, 0.6, 0.8) to be highly effective CO 2 RR. The InNNi 2.4 V 0.6 demonstrated exceptional conversion of CO 2 to formate, achieving an optimal Faraday efficiency (FE) of 93.6 % at −0.754 V versus RHE. It also exhibited a partial current density of 200 mA cm −2 at −1.1 V versus RHE, along with remarkable stability in an H-type cell. Electrochemical tests, X-ray absorption fine structure, and theoretical calculations demonstrated that in addition to altering InNNi 3 electronic structure, V doping results in lattice distortion in NiN 3 octahedron, increasing the lattice spacing of InNNi 2.4 V 0.6 (111) surface, exposing more active sites. This enhances its ability to adsorb the reaction intermediate *OCHO, thereby facilitating the conversion of CO 2 into formate. This research offers a viable approach for optimizing an electrocatalyst to convert CO 2 to valuable products.
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