Journal of Materials Chemistry A
·
2015
·Vol. 3
·期 33
·17217-17223
·
IF 7.443
Liang Huang,Xiang Gao,Qiang Dong,Zhimi Hu,Xu Xiao,Tianqi Li,Yongliang Cheng,Bin Yao,Jun Wan,Dong Ding,Zheng Ling,Jieshan Qiu,Jun Zhou
Pseudocapacitors, which store charge through fast reversible redox reactions occuring at the surface of the electrode, could offer higher specific capacitance than electrochemical double-layer capacitors (EDLCs). However, the prime pseudocapacitive phase, transition metal oxides usually have poor electronic conductivity, limiting their practical application. Here, we fabricated highly conductive HxMoO3−y nanobelts as electrode materials for pseudocapacitors. This electrode has demonstrated great electrochemical activity in various aqueous cation solutions with the highest volumetric capacitance of over 350 F cm−3. Significantly, this electrode has high specific capacitance as well as excellent cycling stability in sea water. Moreover, this hybrid composite also exhibits remarkable ion electrosorptive capacity (4 mg g−1) as a desalination electrode.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Green Energy & Environment
·
2020
·Vol. 7
·期 5
·1006-1013
·
IF 6.395
Shuai Cao,Jingyun Jiang,Qingyong Tian,Cang Guo,Xuzhe Wang,Kun Dai,Qun Xu
Solar distillation is a sustainable and promising technique to generate fresh water. However, the solar vapor generation is a high energy consumption process, resulting in a low water yield under natural sunlight. Hence, developing of advanced evaporators that can simultaneously reduce the energy requirement of water vaporization and accelerate solar water evaporation remains a great challenge. In this study, we report the fabrication of a multifunctional hydrogel of H x MoO 3 /PNIPAM with PNIPAM as hydratable skeleton and H x MoO 3 as the light-absorbing unit for solar water evaporation. The experimental results demonstrate that the as-prepared hydrogel owns excellent photothermal activity. Accurately, the fabricated hydrogel -based solar evaporators achieved high water evaporation rate of 1.65 kg m −2 h −1 with the energy conversion efficiency of 85.87% under 1 kW m −2 irradiation. The enhanced photothermal activity of H x MoO 3 /PNIPAM hydrogel can be attributed to the synergistic effects of the components composed in this hierarchical architecture that change the water state and further speed up water evaporation. The H x MoO 3 /PNIPAM evaporators indicate its great potential for practical implementation of solar water evaporation.
研究领域:
材料科学
·
物理化学
·
能源科学
·
环境工程
·
纳米科技
✓ 已验证
DOI
高影响因子
Surfaces and Interfaces
·
2024
·
IF 5.7
Jianfei Lei,Yanfei Liu,Ying Chen,Chenming Liang,Lele Wang,Yuan Cheng,Zexing Liang
Bimetallic single-atom catalysts have garnered substantial interest due to their extraordinary catalytic prowess, which arises from atomic-level synergistic effects that can significantly enhance hydrogen evolution reaction (HER) kinetics beyond the capabilities of monometallic single-atom catalysts. However, the fabrication of bimetallic single-atom catalysts remains a tremendous challenge. Herein, we introduce an in-situ reduction method to fabricate bimetallic single-atom catalysts anchored on hydrogenated molybdenum trioxide (H x MoO 3 , 0 < x ≤ 2). Intriguingly, H x MoO 3 exhibits inherent reducing capabilities that facilitate the in-situ reduction of some metal ions to metallic single atoms in steps on its surface, thereby enabling the constructing of bimetallic single-atom structures. As a testament to this strategy, the prepared PtM/H x MoO 3 catalysts (M = Ag, Au, Pd, Rh) with ultra-low noble metal loadings (wt% < 1%) on the nano-H x MoO 3 support exhibit remarkable efficiency in HER. Outperforming both monometallic single-atom catalysts (M/H x MoO 3 ) and commercial Pt/C, these catalysts demonstrate enhanced HER performance, and the PtPd/H x MoO 3 exhibits outstanding performance with an overpotentials of 10 mV at 10 mA/cm 2 , Tafel slope of 36 mV/dec, and long-term durability in acidic media. The presence of Pt single-atom significantly enhances the electrochemical surface area (ECSA) and accelerates the kinetics of the HER for other metal single atoms.
研究领域:
材料科学
·
催化化学
·
能源化学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2019
·Vol. 8
·期 1
·69-76
·
IF 10.733
Xueshi Jiang,Lulu Sun,Wen Wang,Fei Qin,Cong Xie,Lin Hu,Yinhua Zhou
In this study, we report 10 cm2 nonfullerene solar cells with power conversion efficiency of 10.24%. The demonstration of the large-area cells is based on the HxMoO3-assisted growth of two silver electrodes, namely, the ultrathin-transparent electrode (on the top) and opaque electrode (at the bottom). The device structure has the configuration glass/HxMoO3/opaque Ag (70 nm)/active layer/HxMoO3/ultrathin Ag (8 nm)/MoO3. The chemically reactive HxMoO3 could react with silver oxide during the growth of the initial few nanometers of silver, as inferred from X-ray spectroscopy measurements. The reaction increases the nucleus sites that assist the continuous and uniform growth of the silver films. The percolation threshold thickness of conductive ultrathin Ag films on HxMoO3 can be as low as 4 nm. The root-mean-square surface roughness of opaque silver (70 nm) grown on the HxMoO3 surface is as low as 1.06 nm. HxMoO3 facilitates the growth of uniform, continuous and smooth silver films that enable the efficient large-area nonfullerene organic solar cells.
研究领域:
材料科学
·
光电化学
✓ 已验证
DOI
高影响因子
Energy & Environmental Materials
·
2020
·Vol. 3
·期 2
·192-201
·
IF 0
Hao Li,Youzeng Li,Qun Xu,Ali Zhang
Functional hydrogel is becoming a frequently used material in various fields, especially in biological and medical applications. In order to overcome the barriers of low uniformity of structure and lack of energy dissipation effect in common hydrogel, in this work a strategy of doping plasmonic H x MoO 3 quantum dots into PNIPAM (poly (N-isopropylacrylamide)) hydrogel to proceed its multifunctionalization is developed. This quantum dots-induced tactic could effectuate the enhancement of photothermal conversion, mechanical property, adhesion, and self-healing performance simultaneously. In particular, for adhesion performance, the toughness value could be elevated to over 2500 J m −2 efficiently. Further, the enhancement mechanism behind the extraordinary adhesion performance is studied, and it can be contributed to the synergistic effect of pore structure regulation and abundant hydrogen bond, which are both beneficial to the interaction between composite hydrogel and solid surface. Subsequently, based on its extraordinary adhesion and self-healing performance, the applicability of H x MoO 3 /PNIPAM hydrogel as a MØ growth substrate is investigated on wound dressing, and the experimental result demonstrates its excellent MØ growth-promoting activity.
✓ 已验证
DOI
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