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Dive into the research topics where Enzheng Shi is active.

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Featured researches published by Enzheng Shi.


ACS Nano | 2014

Laminated Carbon Nanotube Networks for Metal Electrode-Free Efficient Perovskite Solar Cells

Zhen Li; Sneha A. Kulkarni; Pablo P. Boix; Enzheng Shi; Anyuan Cao; Kunwu Fu; Sudip K. Batabyal; Jun Zhang; Qihua Xiong; Lydia Helena Wong; Nripan Mathews; Subodh G. Mhaisalkar

Organic-inorganic metal halide perovskite solar cells were fabricated by laminating films of a carbon nanotube (CNT) network onto a CH3NH3PbI3 substrate as a hole collector, bypassing the energy-consuming vacuum process of metal deposition. In the absence of an organic hole-transporting material and metal contact, CH3NH3PbI3 and CNTs formed a solar cell with an efficiency of up to 6.87%. The CH3NH3PbI3/CNTs solar cells were semitransparent and showed photovoltaic output with dual side illuminations due to the transparency of the CNT electrode. Adding spiro-OMeTAD to the CNT network forms a composite electrode that improved the efficiency to 9.90% due to the enhanced hole extraction and reduced recombination in solar cells. The interfacial charge transfer and transport in solar cells were investigated through photoluminescence and impedance measurements. The flexible and transparent CNT network film shows great potential for realizing flexible and semitransparent perovskite solar cells.


Nano Letters | 2013

Colloidal antireflection coating improves graphene-silicon solar cells.

Enzheng Shi; Hongbian Li; Long Yang; Luhui Zhang; Zhen Li; Peixu Li; Yuanyuan Shang; Shiting Wu; Xinming Li; Jinquan Wei; Kunlin Wang; Hongwei Zhu; Dehai Wu; Ying Fang; Anyuan Cao

Carbon nanotube-Si and graphene-Si solar cells have attracted much interest recently owing to their potential in simplifying manufacturing process and lowering cost compared to Si cells. Until now, the power conversion efficiency of graphene-Si cells remains under 10% and well below that of the nanotube-Si counterpart. Here, we involved a colloidal antireflection coating onto a monolayer graphene-Si solar cell and enhanced the cell efficiency to 14.5% under standard illumination (air mass 1.5, 100 mW/cm(2)) with a stable antireflection effect over long time. The antireflection treatment was realized by a simple spin-coating process, which significantly increased the short-circuit current density and the incident photon-to-electron conversion efficiency to about 90% across the visible range. Our results demonstrate a great promise in developing high-efficiency graphene-Si solar cells in parallel to the more extensively studied carbon nanotube-Si structures.


ACS Applied Materials & Interfaces | 2014

Core-Double-Shell, Carbon Nanotube@Polypyrrole@MnO2 Sponge as Freestanding, Compressible Supercapacitor Electrode

Peixu Li; Yanbing Yang; Enzheng Shi; Qicang Shen; Yuanyuan Shang; Shiting Wu; Jinquan Wei; Kunlin Wang; Hongwei Zhu; Quan Yuan; Anyuan Cao; Dehai Wu

Design and fabrication of structurally optimized electrode materials are important for many energy applications such as supercapacitors and batteries. Here, we report a three-component, hierarchical, bulk electrode with tailored microstructure and electrochemical properties. Our supercapacitor electrode consists of a three-dimensional carbon nanotube (CNT) network (also called sponge) as a flexible and conductive skeleton, an intermediate polymer layer (polypyrrole, PPy) with good interface, and a metal oxide layer outside providing more surface area. These three components form a well-defined core-double-shell configuration that is distinct from simple core-shell or hybrid structures, and the synergistic effect leads to enhanced supercapacitor performance including high specific capacitance (even under severe compression) and excellent cycling stability. The mechanism study reveals that the shell sequence is a key factor; in our system, the CNT-PPy-MnO2 structure shows higher capacitance than the CNT-MnO2-PPy sequence. Our porous core-double-shell sponges can serve as freestanding, compressible electrodes for various energy devices.


Scientific Reports | 2012

TiO2-Coated Carbon Nanotube-Silicon Solar Cells with Efficiency of 15%

Enzheng Shi; Luhui Zhang; Zhen Li; Peixu Li; Yuanyuan Shang; Yi Jia; Jinquan Wei; Kunlin Wang; Hongwei Zhu; Dehai Wu; Sen Zhang; Anyuan Cao

Combining carbon nanotubes (CNTs), graphene or conducting polymers with conventional silicon wafers leads to promising solar cell architectures with rapidly improved power conversion efficiency until recently. Here, we report CNT-Si junction solar cells with efficiencies reaching 15% by coating a TiO2 antireflection layer and doping CNTs with oxidative chemicals, under air mass (AM 1.5) illumination at a calibrated intensity of 100 mW/cm2 and an active device area of 15 mm2. The TiO2 layer significantly inhibits light reflectance from the Si surface, resulting in much enhanced short-circuit current (by 30%) and external quantum efficiency. Our method is simple, well-controlled, and very effective in boosting the performance of CNT-Si solar cells.


Advanced Materials | 2014

Graphene Nanoribbon Aerogels Unzipped from Carbon Nanotube Sponges

Qingyu Peng; Yibin Li; Xiaodong He; Xuchun Gui; Yuanyuan Shang; Chunhui Wang; Chao Wang; Shanyi Du; Enzheng Shi; Peixu Li; Dehai Wu; Anyuan Cao

Graphene nanoribbon aerogels are fabricated by directly unzipping multi-walled carbon nanotube sponges. These fascinating materials have potential applications as high performance nanocomposites and supercapacitor electrodes.


Advanced Materials | 2012

Super‐Stretchable Spring‐Like Carbon Nanotube Ropes

Yuanyuan Shang; Xiaodong He; Yibin Li; Luhui Zhang; Zhen Li; Chunyan Ji; Enzheng Shi; Peixu Li; Ke Zhu; Qingyu Peng; Chao Wang; Xinjiang Zhang; Rongguo Wang; Jinquan Wei; Kunlin Wang; Hongwei Zhu; Dehai Wu; Anyuan Cao

Spring-like carbon nanotube ropes consisting of perfectly arranged loops are fabricated by spinning single-walled nanotube films, and can sustain tensile strains as high as 285%.


Nano Letters | 2010

Carbon Nanotube and CdSe Nanobelt Schottky Junction Solar Cells

Luhui Zhang; Yi Jia; Shanshan Wang; Zhen Li; Chunyan Ji; Jinquan Wei; Hongwei Zhu; Kunlin Wang; Dehai Wu; Enzheng Shi; Ying Fang; Anyuan Cao

Developing nanostructure junctions is a general and effective way for making photovoltaics. We report Schottky junction solar cells by coating carbon nanotube films on individual CdSe nanobelts with open-circuit voltages of 0.5 to 0.6 V and modest power-conversion efficiencies (0.45-0.72%) under AM 1.5G, 100 mW/cm(2) light condition. In our planar device structure, the CdSe nanobelt serves as a flat substrate to sustain a network of nanotubes, while the nanotube film forms Shottky junction with the underlying nanobelt at their interface and also makes a transparent electrode for the device. The nanotube-on-nanobelt solar cells can work either in front (nanotube side) or back (nanobelt side) illumination with stable performance in air. Our results demonstrate a promising way to develop large-area solar cells based on thin films of carbon nanotubes and semiconducting nanostructures.


Nano Research | 2014

Carbon nanotube-polypyrrole core-shell sponge and its application as highly compressible supercapacitor electrode

Peixu Li; Enzheng Shi; Yanbing Yang; Yuanyuan Shang; Qingyu Peng; Shiting Wu; Jinquan Wei; Kunlin Wang; Hongwei Zhu; Quan Yuan; Anyuan Cao; Dehai Wu

A carbon nanotube (CNT) sponge contains a three-dimensional conductive nanotube network, and can be used as a porous electrode for various energy devices. We present here a rational strategy to fabricate a unique CNT@polypyrrole (PPy) core-shell sponge, and demonstrate its application as a highly compressible supercapacitor electrode with high performance. A PPy layer with optimal thickness was coated uniformly on individual CNTs and inter-CNT contact points by electrochemical deposition and crosslinking of pyrrole monomers, resulting in a core-shell configuration. The PPy coating significantly improves specific capacitance of the CNT sponge to above 300 F/g, and simultaneously reinforces the porous structure to achieve better strength and fully elastic structural recovery after compression. The CNT@PPy sponge can sustain 1,000 compression cycles at a strain of 50% while maintaining a stable capacitance (> 90% of initial value). Our CNT@PPy core-shell sponges with a highly porous network structure may serve as compressible, robust electrodes for supercapacitors and many other energy devices.


Nanoscale | 2013

Highly deformation-tolerant carbon nanotube sponges as supercapacitor electrodes

Peixu Li; Chuiyan Kong; Yuanyuan Shang; Enzheng Shi; Yuntao Yu; Weizhong Qian; Fei Wei; Jinquan Wei; Kunlin Wang; Hongwei Zhu; Anyuan Cao; Dehai Wu

Developing flexible and deformable supercapacitor electrodes based on porous materials is of high interest in energy related fields. Here, we show that carbon nanotube sponges, consisting of highly porous conductive networks, can serve as compressible and deformation-tolerant supercapacitor electrodes in aqueous or organic electrolytes. In aqueous electrolytes, the sponges maintain a similar specific capacitance (>90% of the original value) under a predefined compressive strain of 50% (corresponding to a volume reduction of 50%), and retain more than 70% of the original capacitance under 80% strain while the volume normalized capacitance increases by 3-fold. The sponge electrode maintains a stable performance after 1000 large strain compression cycles. A coin-shaped cell assembled with these sponges shows excellent stability over 15,000 charging cycles with negligible degradation after 500 cycles. Our results indicate that carbon nanotube sponges have the potential to fabricate deformable supercapacitor electrodes with stable performance.


ACS Nano | 2012

Porous, Platinum Nanoparticle-Adsorbed Carbon Nanotube Yarns for Efficient Fiber Solar Cells

Sen Zhang; Chunyan Ji; Zuqiang Bian; Pingrong Yu; Luhui Zhang; Dianyi Liu; Enzheng Shi; Yuanyuan Shang; Haitao Peng; Qiao Cheng; Dong Wang; Chunhui Huang; Anyuan Cao

Pt is a classical catalyst that has been extensively used in fuel cell and solar cell electrodes, owing to its high catalytic activity, good conductivity, and stability. In conventional fiber-shaped solar cells, solid Pt wires are usually adopted as the electrode material. Here, we report a Pt nanoparticle-adsorbed carbon nanotube yarn made by solution adsorption and yarn spinning processes, with uniformly dispersed Pt nanoparticles through the porous nanotube network. We have fabricated TiO(2)-based dye-sensitized fiber solar cells with a Pt-nanotube hybrid yarn as counter electrode and achieved a power conversion efficiency of 4.85% under standard illumination (AM1.5, 100 mW/cm(2)), comparable to the same type of fiber cells with a Pt wire electrode (4.23%). Adsorption of Pt nanoparticles within a porous nanotube yarn results in enhanced Pt-electrolyte interfacial area and significantly reduced charge-transfer resistance across the electrolyte interface, compared to a pure nanotube yarn or Pt wire. Our porous Pt-nanotube hybrid yarns have the potential to reduce the use of noble metals, lower the device weight, and improve the solar cell efficiency.

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Yuanyuan Shang

Harbin Institute of Technology

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