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| 1 | An efficient bifunctional electrocatalyst derived from layer-by-layer self-assembly of a three-dimensional porous Co-N-C@graphene显示文摘Three-dimensional (3D) porous carbon-based materials with tunable composition and microstructure are of great interest for the development of oxygen involved electrocatalytic reactions. Here, we report the synthesis of 3D porous carbon-based electrocatalyst by self-assembling Co-metal organic frameworks (MOF) building blocks on graphene via a layer-by-layer technique. Precise control of the structure and morphology is achieved by varying the MOF layer to tune the electrocatalytic properties. The as-produced electrocatalyst exhibits an excellent catalytic activity for the oxygen reduction reaction in 0.1molL^-1 KOH, showing a high onset potential of 0.963V vs. reversible hydrogen electrode (RHE) and a low tafel slope of 54mVdec^-1, compared to Pt/C (0.934V and 52mVdec^-1, respectively). Additionally, it shows a slightly lower potential vs. RHE (1.72V) than RuO2 (1.75V) at 10mAcm^-2 in an alkaline electrolyte. A rechargeable Zn-air battery based on the as-produced 3D porous catalyst demonstrates a high peak power density of 119mWcm^-2 at a cell voltage of 0.578V while retaining an excellent stability over 250 charge-discharge cycles. | Shichang Cai Rui Wang William M. Yourey Junsheng Li Haining Zhang Haolin Tang | 2019 | Science Bulletin2019，64，14： | 6 |
| 2 | Rational design of hierarchically porous Fe-N-doped carbon as efficient electrocatalyst for oxygen reduction reaction and Zn-air batteries显示文摘The rational design and construction of hierarchically porous nanostructure for oxygen reduction reaction (ORR) electrocatalysts is crucial to facilitate the exposure of accessible active sites and promote the mass/electron transfer under the gas-solid-liquid triple-phase condition. Herein, an ingenious method through the pyrolysis of creative polyvinylimidazole coordination with Zn/Fe salt precursors is developed to fabricate hierarchically porous Fe-N-doped carbon framework as efficient ORR electrocatalyst. The volatilization of Zn species combined with the nanoscale Kirkendall effect of Fe dopants during the pyrolysis build the hierarchical micro-, meso-, and macroporous nanostructure with a high specific surface area (1,586 m^(2)·g^(−1)), which provide sufficient exposed active sites and multiscale mass/charge transport channels. The optimized electrocatalyst exhibits superior ORR activity and robust stability in both alkaline and acidic electrolytes. The Zn-air battery fabricated by such attractive electrocatalyst as air cathode displays a higher peak power density than that of Pt/C-based Zn-air battery, suggesting the great potential of this electrocatalyst for Zn-air batteries. | Zihan Meng Neng Chen Shichang Cai Jiawei Wu Rui Wang Tian Tian Haolin Tang | 2021 | Nano Research2021，14，12： | 4 |
| 3 | Pervasive hybridization during evolutionary radiation of Rhododendron subgenus Hymenanthes in mountains of southwest China显示文摘Radiations are especially important for generating species biodiversity in mountainous ecosystems.The contribution of hybridization to such radiations has rarely been examined.Here,we use extensive genomic data to test whether hybridization was involved in evolutionary radiation within Rhododendron subgenus Hymenanthes,whose members show strong geographic isolation in the mountains of southwest China.We sequenced genomes for 143 species of this subgenus and 93 species of four other subgenera,and found that Hymenanthes was monophyletic and radiated during the late Oligocene to middle Miocene.Widespread hybridization events were inferred within and between the identified clades and subclades.This suggests that hybridization occurred both early and late during diversification of subgenus Hymenan thes,although the extent to which hybridization,speciation through mixing-isolation-mixing or hybrid speciation,accelerated the diversification needs further exploration.Cycles of isolation and contact in such and other montane ecosystems may have together promoted species radiation through hybridization between diverging populations and species.Similar radiation processes may apply to other montane floras in this region and elsewhere. | Yazhen Ma Xingxing Mao Ji Wang Lei Zhang Yuanzhong Jiang Yuying Geng Tao Ma Liming Cai Shuangquan Huang Pete Hollingsworth Kangshan Mao Minghui Kang Yiling Li Wenlu Yang Haolin Wu Yang Chen Charles C.Davis Nawal Shrestha Richard H.Ree Zhenxiang Xi Quanjun Hu Richard I.Milne Jianquan Liu | 2022 | National Science Review2022，9，12： | 1 |
| 4 | Fast-response,high-sensitivity multi-modal tactile sensors based on PPy/Ti_(3)C_(2)T_(x) films for multifunctional applications显示文摘In recent years,multi-modal flexible tactile sensors have become an important direction in the development of electronic skin because of their excellent sensitivity,flexibility and wearable properties.In this work,a humidity-pressure multi-modal flexible sensor based on polypyrrole(PPy)/Ti_(3)C_(2)T_(x) sensitive film packaged with porous polydimethylsiloxane(PDMS)is investigated by combining the sensitive structure generation mechanism of in situ polymerization to achieve the simultaneous detection of humidity and pressure,which has a sensitivity of 89,113.4Ω/%RH in a large humidity range of 0%-97%RH,and response/recovery time of 2.5/1.9 s.The tactile pressure sensing has a high sensitivity,a fast response of 67/52 ms,and a wide detection limit.The device also has excellent performance in terms of stability and repeatability,making it promising for respiratory pattern and motion detection.This work provides a new solution to address the construction of multi-modal tactile sensors with potential applications in the fields of medical health,epidemic prevention. | Guangshuai Xi Dongzhi Zhang Mingcong Tang Hao Zhang Yuehang Sun Yubiao Zhang Haolin Cai Hui Xia Dandi Zhou | 2024 | Nano Research2024，17，5： | 0 |
| 5 | Nitrogen doped porous carbon-based bifunctional oxygen electrocatalyst with controllable phosphorus content for zinc-air battery显示文摘The controllable construction of non-noble metal based bifunctional catalysts with high activities towards oxygen reduction reaction(ORR)and oxygen evolution reaction(OER)is of great significance,but remains a challenge.Herein,we reported an effective method to synthesize cobalt-nitrogen doped mesoporous carbon-based bifunctional oxygen electrocatalyst with controllable phosphorus content(Co-N-P_(X)-MC,X=0.5,1.0,1.5,2.0).The mesoporous carbon substrate endowed the asprepared samples with more exposed active surface(236.50 m^(2)·g^(−1))and the most appropriate doping ratio of phosphorus had been investigated to be 1.5(Co-N-P1.5-MC).For ORR,Co-N-P1.5-MC exhibited excellent catalytic activity with more positive onset potential(1.01 V)and half-wave potential(0.84 V)than the other samples.For OER,Co-N-P1.5-MC also showed a low overpotential of 415 mV.Combining experimental results and density-functional theory(DFT)calculations,the outstanding bifunctional catalytic performance of Co-N-P1.5-MC was due to the synergistic cooperation between the P and N dopants,which could reduce the reaction barriers and was favorable for ORR and OER.Moreover,the Zn-air battery using Co-N-P1.5-MC as the cathode showed remarkable battery performance with high stability(could operate stably for over 160 h at 10 mA·cm^(−2))and maximum power density(119 mW·cm^(−2)),demonstrating its potential for practical applications.This work could provide significant enlightenment towards the design and construction of bifunctional oxygen electrocatalyst for next-generation electrochemical devices. | Shichang Cai Zihan Meng Gaojie Li Yu An Yapeng Cheng Erjun Kan Bo Ouyang Haining Zhang Haolin Tang | 2023 | Nano Research2023，16，4： | 0 |
| 6 | MXene/PPy@PDMS sponge-based flexible pressure sensor for human posture recognition with the assistance of a convolutional neural network in deep learning显示文摘The combination of flexible sensors and deep learning has attracted much attention as an efficient method for the recognition of human postures.In this paper,an in situ polymerized MXene/polypyrrole(PPy)composite is dip-coated on a polydimethylsiloxane(PDMS)sponge to fabricate an MXene/PPy@PDMS(MPP)piezoresistive sensor.The sponge sensor achieves ultrahigh sensitivity(6.8925 kPa^(−1))at 0-15 kPa,a short response/recovery time(100/110 ms),excellent stability(5000 cycles)and wash resistance.The synergistic effect of PPy and MXene improves the performance of the composite materials and facilitates the transfer of electrons,making the MPP sponge at least five times more sensitive than sponges based on each of the individual single materials.The large-area conductive network allows the MPP sensor to maintain excellent electrical performance over a large-scale pressure range.The MPP sensor can detect a variety of human body activity signals,such as radial artery pulse and different joint movements.The detection and analysis of human motion data,which is assisted by convolutional neural network(CNN)deep learning algorithms,enable the recognition and judgment of 16 types of human postures.The MXene/PPy flexible pressure sensor based on a PDMS sponge has broad application prospects in human motion detection,intelligent sensing and wearable devices. | Hui Xia Lin Wang Hao Zhang Zihu Wang Liang Zhu Haolin Cai Yanhua Ma Zhe Yang Dongzhi Zhang | 2023 | Microsystems & Nanoengineering2023，9，6： | 0 |
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