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首页> 外文期刊>Catalysis science & technology >Construction of 2D/2D Ni2P/CdS heterojunctions with significantly enhanced photocatalytic H-2 evolution performance
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Construction of 2D/2D Ni2P/CdS heterojunctions with significantly enhanced photocatalytic H-2 evolution performance

机译：建设2 d / 2 d Ni2P / cd垂直显著提高光催化2进化性能

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Two-dimensional (2D) materials have received tremendous attention in photocatalysis owing to their superior physicochemical properties including high specific surface areas, efficient interfacial charge separation and abundant surface active sites. Herein, 2D/2D Ni2P/CdS heterojunctions with Ni2P nanosheets (NSs) loaded on ultrathin CdS NSs were fabricated by combining liquid exfoliation of bulk CdS with a post-annealing procedure. The crystal phases, morphologies, microstructures, optical properties and specific surface areas of the as-prepared photocatalysts were thoroughly investigated by multiple detection techniques. The results of photocatalytic H-2 evolution performance under visible light revealed that the optimal 2D/2D Ni2P/CdS heterojunction showed a significantly enhanced photocatalytic H-2 evolution rate of 17.95 mmol g(-1) h(-1) using lactic acid as a sacrificial reagent, which was approximately 6 times higher than that of bare exfoliated CdS NSs, corresponding to the apparent quantum efficiency (AQE) of 4.2% under 420 nm monochromatic light. In addition, based on the analysis of electrochemical impedance spectroscopy (EIS), photocurrent response, steady photoluminescence (PL) spectroscopy and time-resolved photoluminescence (TRPL) spectroscopy, the enhanced photocatalytic H-2 evolution activity was attributed to the effective separation and transfer of photogenerated charge carriers and generation of sufficient active sites. This work provided valid evidence that the use of 2D/2D heterojunction photocatalysts would be a promising technique in water splitting for H-2 generation.
机译：二维(2 d)材料已经收到在光催化由于巨大的关注其优越的物理化学性质如比表面积高的地区,高效界面电荷分离和丰富表面活性的网站。垂直与Ni2P nanosheets (NSs)加载对超薄cd NSs捏造相结合液体剥离的散装光盘气割后退火过程。形态、微观结构、光学性质和特定的表面区域做好准备论文被彻底调查多种检测技术。光催化2演化下的性能可见光表明最优2 d / 2 d显著Ni2P / cd异质结了增强光催化氢进化的速度17.95更易与g (1) h(1)使用乳酸作为牺牲试剂,这大约是6倍的光剥落了cdNSs,表观量子对应效率(AQE)的4.2%在420海里单色光。电化学阻抗分析光谱法(EIS),光电流响应,稳定光致发光(PL)光谱和时间分辨光致发光(TRPL)光谱学,增强光催化2活动是由于进化有效的分离和转移photogenerated运营商和一代的收费充分活跃的网站。证据表明,使用2 d / 2 d异质结论文将是一个很有前途的技术水分裂为2代。

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