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| 1 | High-performance Li-ion batteries based on graphene quantum dot wrapped carbon nanotube hybrid anodes显示文摘Since Akira Yoshino first proposed the usage of the carbonaceous materials as an anode of lithium ion batteries(LIBs)in 1985,carbonaceous materials such as graphite and graphene have been widely considered as LIB anodes.Here,we explored the application of novel carbonaceous UB anodes incorporating graphene quantum dots(GQDs).We fabricated a freestanding all-carbon electrode based on a porous carbon nanotube(CNT)sponge via a facile in-situ hydrothermal deposition technique,creating coaxial structure of GQD-coated CNTs(GQD@CNTs)through electrostatic interaction and n-n stacking with tunable loading and functionalization.This hybrid structure combined conductive CNTs with highly active GQDs,in which GQDs with predesigned functional groups provided massive storage sites for Li ions and the 3D CNT frameworks avoided the agglomeration of GQDs,together contributing to a high specific capacity(700 mAh·g^-1 at 100 mA·g^-1 after 100 cycles)and rate performance.Even at a high current density of 1,000 mA·g^-1,the reversible specific capacity remained at 483 mAh g-1 after 350 cycles.In particular,the mechanism study demonstrated the important role of oxygen functional groups of GQDs in promoting the performance of the LIB anodes by controlled grafting of GQDs onto various porous-carbon and metal-foam based structures. | Xuewei Zhao Yizeng Wu Yunsong Wang Huaisheng Wu Yawei Yang Zhipeng Wang Linxiu Dai Yuanyuan Shang Anyuan Cao | 2020 | Nano Research2020，13，4： | 7 |
| 2 | FeNi nanoparticles on Mo_(2)TiC_(2)T_(x)MXene@nickel foam as robust electrocatalysts for overall water splitting显示文摘The development of cost-effective electrocatalysts for overall water splitting is highly desirable,remaining a critical challenge at current stage.Herein,a class of composite FeNi@MXene(Mo_(2)TiC_(2)T_(x))@nickel foam(NF)has been synthesized through introducing Fe2+ions and in-situ combining with surface nickel atoms on nickel foam.The obtained FeNi@Mo_(2)TiC_(2)T_(x)@NF exhibited high activity with overpotentials of 165 and 190 mV for the hydrogen evolution reaction(HER)and oxygen evolution reaction(OER)at a current density of 10 mA·cm^(-2),respectively.The synergetic effects of Mo_(2)TiC_(2)T_(x)and FeNi nanoalloys lead to increasing catalytic activities,where MXene provides high active surface area and rich active sites for HER,and FeNi nanoalloys promote the OER.Theoretical simulation of electron exchange capacity between FeNi and MXene in FeNi@Mo_(2)TiC_(2)T_(x)catalyst shows that electrons transferred from surface Mo atoms to the interface between FeNi and MXene,indicating that the electrons are accumulated near the FeNi nanoparticles.This kind of electronic distribution facilitates the formation of intermediate of NiOOH.Correspondingly,(H++e-)is more inclined onto Mo-Ni interfaces for HER.The Gibbs free energy changes for H*to HER and potential-limiting step for-OOH intermediate in OER over FeNi@Mo_(2)TiC_(2)T_(x)are much less than those on bare MXene.The catalyst can be further used for overall water splitting in alkaline solution,realizing a current density of 50 mA·cm^(-2)at 1.74 V.This work provides a facile strategy to achieve efficient and cheap catalysts for new energy production. | Jiayang Wang Peilei He Yongli Shen Linxiu Dai Zhe Li Yue Wu Changhua An | 2021 | Nano Research2021，14，10： | 5 |
| 3 | Improving CNT-Si solar cells by metal chloride-to-oxide transformation显示文摘Transitional metal oxides(TMOs)are important functional materials in silicon-based and thin-film optoelectronics.Here,TMOs areapplied in carbon nanotube(CNT)-Si solar cells by spin-coating solutions of metal chlorides that undergo favorable transformation in ambient conditions.An unconventional change in solar cell behavior is observed after coating two particular chlorides(MoCl,and WCls,respectively),characterized by an initial severe degradation followed by gradual recovery and then well surpassing the original performance.Detailed analysis reveals that the formation of correspondina oxides(MoOa and WO.)enables two primary functions on both CNTs(p-type doping)and Si(inducing inversion layer),leading to significant improvement in open-circuit voltage and fill factor,with power conversion efficiencies up to 13.0%(MoOg)and 13.4%(WOg).Further combining with other chlorides to increase the short-circuit current,ultimate cells efficiencies achieve>16%with over 90%retention after 24 h,which are among the highes stable efficiencies reported for CNT-Si solar cells.The transformation of functional layers as demonstrated here has profoundinfluence on the device characteristics,and represents a potential strategy in low-cost manufacturing of next-generation high efficiency photovoltaics. | Huaisheng Wu Xuewei Zhao Yizeng Wu Qinghuan Ji Linxiu Dai Yuanyuan Shang Anyuan Cao | 2020 | Nano Research2020，13，2： | 3 |
| 4 | Surface-tuning nanoporous AuCu_(3) engineering syngas proportion by electrochemical conversion of CO_(2)显示文摘The direct electrochemical conversion of CO_(2) to syngas with controllable composition remains challenging. In this work, driven by concentration gradient, a simple air-heating aided strategy has been developed to adjust surface composition of the self-supporting nanoporous AuCu_(3) alloy. According to Fick First Law, the interior Cu atoms of the AuCu_(3) alloy with Au-rich surface gradually segregated outwards during heating, realizing Cu-rich surface eventually. Correspondingly, the competing electrocatalytic CO_(2) reduction (ECR) to CO and hydrogen evolution reactions (HER) were tactfully balanced on these alloy surfaces, thus achieving proportion-tunable syngas (CO/H2). Density functional theory (DFT) calculations on the Gibbs free energy change of the COOH* and H* (ΔGCOOH*, ΔGH*) on the alloy surfaces were conducted, which are generally considered as the selectivity descriptors for CO and H2 products, respectively. It shows ΔGCOOH* gradually increases in contrast to the decreased ΔGH* with more Cu on the surface, suggesting H2 is more favored over Cu sites, which is consistent with the declining CO/H2 ratio observed in the experiments. This study reveals that the surface composition controls ECR activity of nanoporous AuCu_(3) alloy, providing an alternative way to the syngas production with desirable proportion. | Chao An Yongli Shen Wenxiu Yan Linxiu Dai Changhua An | 2021 | Nano Research2021，14，11： | 1 |
| 5 | Heterogeneous synergistic catalysis by Ru-RuOx nanoparticles for Se-Se bond activation显示文摘转变从对 nanocatalysts 启用的异构的合成化学同类为无机的 nanoparticles 和器官的底层要求反应机制和结构活动关系的调查。此处,我们报导热水地综合的钌 nanoparticles 在 Se-Se 契约激活和 heterocycles 的 selenylation 不同地表现了,展出在催化活动和作文之间的一种塑造火山的关系。 synergistic 效果为 Ru-RuO x nanocatalysts 被观察,与众多的描述和密度建议一个 PhSeSePh 分子能开始在金属性的 Ru 地点上被吸附并且劈开 PhSe 进二的功能的理论( DFT )计算*种类,它随后移居到 RuO x 地点并且与 nucleophile 反应完成 heterocycles 的 selenylation 。 | Mu Lin Liqun Kang Jun Gu Linxiu Dai Shengbo Tang Tao Zhang YuhaoWang Lindong Li Xiaoyu Zheng Wei Zhu Rui Si Xuefeng Fu Lingdong Sun Yawen Zhang Chunhua Yan | 2017 | Nano Research2017，10，3： | 0 |
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