Percorrer por autor "Sun, Rong"
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- Atomic-scale structure and nonlinear optical absorption of two-dimensional GeSPublication . Zhang, Jijun; Sun, Rong; Ge, Yanqi; Wang, Jingyi; Wang, Zexuan; Meng, Lijian; Deepak, Francis Leonard; Zhang, Min; Yin, Peng; Cheng, Faliang; Wang, Zhiming; Wang, ZhongchangGermanium sulfide (GeS) represents a typical two-dimensional (2D) material that exhibits fascinating prospects for optoelectronic applications, and the understanding of its atomic-scale structure is crucial to tailoring its desired photonic properties. Here, we systematically investigate the atomic-scale structure of GeS and its nonlinear optical absorption properties. The GeS nanosheets of a thickness of 2, 3 layers exhibit high optical nonlinearity with an effective nonlinear coefficient of -0.318 cm/GW, larger than that of black phosphorous by three orders, which can be applied for the generation of ultrashort-pulse lasers. We fabricate a Tm-doped passively mode-locked fiber laser based on a GeS saturable absorber and achieve a fundamental repetition rate of 9.7 MHz and a pulse duration as short as 1.56 ps at ∼2 µm. These findings suggest that 2D GeS nanosheets could be an efficient nonlinear material in the mid-infrared waveband with potential applications in integrated nonlinear photonics.
- Piezo-photocatalysis synergy in γ-GeSe for highly efficient oxygen evolution reactionPublication . Zhang, Tianqi; Zhou, Long; Chen, Guobo; Wei, Songrui; Sun, Rong; Li, Yunping; Meng, Lijian; Zhang, Guanglong; Xia, Shuwei; Wang, Zhongchang; Qiu, MengSolar-driven semiconductor photocatalysts are highly appealing in applications of environmental remediation and energy conversion. However, photocatalytic reactions, particularly oxygen evolution reaction (OER), are often constrained by the swift recombination of electron–hole pairs, thereby resulting in low reaction efficiency. Although it is effective to separate charge carriers by constructing heterojunctions to form built-in electric field, the lattice mismatch and inefficient interlayer charge transfer of heterojunctions in the photocatalysts limit their further development. Here, we propose a new strategy by constructing an internal electric field for OER through an individual piezoelectric two-dimensional material. The results indicate that the piezoelectric effect regulates the electronic structure, reduces bandgap, improves light absorption efficiency, and that the displacement of positive and negative charge centers is the key factor in the enhanced OER. This research indicates the feasibility of combining piezoelectric properties of two-dimensional materials with OER (1.19 eV), providing new insights and guidance for applying the piezoelectric effect in the OER and opening up a way to promote efficient separation of charge carriers.