S‐induced Phase Change Forming In2O3/In2S3 Heterostructure for Photoelectrochemical Glucose Sensor

• Published in: Chemistry : a European journal 2024-02, Vol.30 (7), p.n/a
• Main Authors: Wang, Bingrong, Zhang, Nan, Wang, Yifeng, Chen, Delun, Qi, Junlei, Tu, Jinchun
• Format: Article
• Language: English
• Subjects: Electronic structure; energy band; Energy bands; Glucose; heterostructure; Heterostructures; In2O3/In2S3; Indium oxides; Performance enhancement; Phase change; Photoelectric effect; photoelectrochemical sensing; Sulfur
• ISSN: 0947-6539; 1521-3765
• DOI: 10.1002/chem.202303514

In the past several decades, Photoelectrochemical (PEC) sensing still remains a great challenge to design highly‐efficient semiconductor photocatalysts via a facile method. It is of much importance to design and synthesize various novel nanostructured sensing materials for further improving the response performance. Herein, we present an In2O3/In2S3 heterostructure obtained by combining microwave assisted hydrothermal method with S‐induced phase change, whose energy band and electronic structure could be adjusted by changing the S content. Combining theoretical calculation and spectroscopic techniques, the introduction of sulfur was proved to produce multifunctional interfaces, inducing the change of phase, oxygen vacancies and band gap, which accelerates the separation of photoexcited carriers and reduces their recombination, improving the electronic injection efficiency around the interface of In2O3/In2S3. As anticipated, an enhanced glucose response performance with a photocurrent of 0.6 mA cm−2, a linear range of 0.1–1 mM and a detection limit as low as 14.5 μM has been achieved based on the In2O3/In2S3 heterostructure, which is significant superior over its pure In2O3 and S‐doped In2O3 counterparts. This efficient interfacial strategy may open a new route to manipulate the electrical structure, and energy band structure regulation of sensing material to improve the performance of photoelectrodes for PEC. Interface construction through experimental control of the introduced anions allows the tuning of the energy bands of photoanode materials. The cooperative energy band and electronical structure of In2O3/In2S3 resulted in a photocurrent of 0.6 mA⋅cm−2 when exposed to light irradiation. This strategy has practical significance for developing low‐cost, high‐performance PEC sensors.