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| 1 | Defect engineering of ternary Cu-In-Se quantum dots for boosting photoelectrochemical hydrogen generation显示文摘Heavy-metal-free ternary Cu–In–Se quantum dots(CISe QDs)are promising for solar fuel production because of their low toxicity,tunable band gap,and high light absorption coefficient.Although defects significantly affect the photophysical properties of QDs,the influence on photoelectrochemical hydrogen production is not well understood.Herein,we present the defect engineering of CISe QDs for efficient solar-energy conversion.Lewis acid–base reactions between metal halide–oleylamine complexes and oleylammonium selenocarbamate are modulated to achieve CISe QDs with the controlled amount of Cu vacancies without changing their morphology.Among them,CISe QDs with In/Cu=1.55 show the most outstanding photoelectrochemical hydrogen generation with excellent photocurrent density of up to 10.7 mA cm-2(at 0.6 VRHE),attributed to the suitable electronic band structures and enhanced carrier concentrations/lifetimes of the QDs.The proposed method,which can effectively control the defects in heavy-metal-free ternary QDs,offers a deeper understanding of the effects of the defects and provides a practical approach to enhance photoelectrochemical hydrogen generation. | Shi Li Sung-Mok Jung Wookjin Chung Joo-Won Seo Hwapyong Kim Soo Ik Park Hyo Cheol Lee Ji Su Han Seung Beom Ha In Young Kim Su-Il In Jae-Yup Kim Jiwoong Yang | 2023 | Carbon Energy2023，5，12： | 1 |
| 2 | 氮掺杂中药废渣生物质碳材料电容性能研究显示文摘以废弃的中药废渣作为前驱体,Ni(NO_(3))_(2)为原位造孔剂,尿素为氮源,采用水热法进行氮原子掺杂改性,再经预碳化-活化法制备氮掺杂生物质碳(Ni-N-CMW)。研究表明制备的生物质碳材料具有丰富的孔隙结构,改性掺杂的生物质碳材料Ni-N-CMW比表面积和平均孔径分别为2234.17 m2·g^(-1)和1.86 nm。对生物质碳材料进行电化学性能测试,结果表明氮掺杂改性生物质碳材料比电容为405 F·g^(-1),明显高于未掺杂的生物质碳(256 F·g^(-1)),且在电流密度增加至8 A·g^(-1)时,Ni-N-CMW比电容依然能达到332 F·g^(-1),电容保持率高达82.1%。除此之外,在5000次循环充放电结束后仍能保持91.2%的比容量,具有良好的循环稳定性。本研究不仅提供了一种回收利用中药废渣的方法,而且为进一步发展中药废渣在电容器电极材料领域的应用提供了理论依据。 | 孟瑶 严冬 许珂 袁治冶 汪形艳 | 2023 | 电子元件与材料2023，42，4： | 1 |
| 3 | Photothermal‐boosted polaron transport in Fe_(2)O_(3)photoanodes for efficient photoelectrochemical water splitting显示文摘Introduction of the photothermal effect into transition-metal oxide photoanodes has been proven to be an effective method to improve the photoelectrochemical(PEC)water-splitting performance.However,the precise role of the photothermal effect on the PEC performance of photoanodes is still not well understood.Herein,spinel-structured ZnFe_(2)O_(4)nanoparticles are deposited on the surface of hematite(Fe_(2)O_(3)),and the ZnFe_(2)O_(4)/Fe_(2)O_(3)photoanode achieves a high photocurrent density of 3.17 mA cm^(-2)at 1.23 V versus a reversible hydrogen electrode(VRHE)due to the photothermal effect of ZnFe_(2)O_(4).Considering that the hopping of electron small polarons induced by oxygen vacancies is thermally activated,we clarify that the main reason for the enhanced PEC performance via the photothermal effect is the promoted mobility of electron small polarons that are bound to positively charged oxygen vacancies.Under the synergistic effect of oxygen vacancies and the photothermal effect,the electron conductivity and PEC performance are significantly improved,which provide fundamental insights into the impact of the photothermal effect on the PEC performance of small polaron-type semiconductor photoanodes. | Xiaoqin Hu Jing Huang Yu Cao Bing He Xun Cui Yunhai Zhu Yang Wang Yihuang Chen Yingkui Yang Zhen Li Xueqin Liu | 2023 | Carbon Energy2023，5，9： | 0 |
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