Journal ArticleDOI
Morphology and Doping Engineering of Sn-Doped Hematite Nanowire Photoanodes
Mingyang Li,Mingyang Li,Yi Yang,Yichuan Ling,Weitao Qiu,Fuxin Wang,Tianyu Liu,Yu Song,Yu Song,Xiao-Xia Liu,Ping-Ping Fang,Yexiang Tong,Yat Li +12 more
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TLDR
A silica encapsulation method is demonstrated that is able to simultaneously retain the hematite nanowire morphology even after high-temperature calcination at 800 °C and improve the concentration and uniformity of dopant distribution along the nanowires growth axis.Abstract:
High-temperature activation has been commonly used to boost the photoelectrochemical (PEC) performance of hematite nanowires for water oxidation, by inducing Sn diffusion from fluorine-doped tin oxide (FTO) substrate into hematite. Yet, hematite nanowires thermally annealed at high temperature suffer from two major drawbacks that negatively affect their performance. First, the structural deformation reduces light absorption capability of nanowire. Second, this “passive” doping method leads to nonuniform distribution of Sn dopant in nanowire and limits the Sn doping concentration. Both factors impair the electrochemical properties of hematite nanowire. Here we demonstrate a silica encapsulation method that is able to simultaneously retain the hematite nanowire morphology even after high-temperature calcination at 800 °C and improve the concentration and uniformity of dopant distribution along the nanowire growth axis. The capability of retaining nanowire morphology allows tuning the nanowire length for opt...read more
Citations
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Journal ArticleDOI
Surface, Bulk, and Interface: Rational Design of Hematite Architecture toward Efficient Photo-Electrochemical Water Splitting.
TL;DR: A close look into recent progress of hematite photoanodes for PEC water splitting is provided, and typical methods for enhancing light absorption and accelerating charge transport in hematites bulk are reviewed, concentrating upon doping and nanostructuring.
Journal ArticleDOI
Energy related CO2 conversion and utilization: Advanced materials/nanomaterials, reaction mechanisms and technologies
Yun Zheng,Wenqiang Zhang,Yifeng Li,Jing Chen,Bo Yu,Jianchen Wang,Lei Zhang,Lei Zhang,Jiujun Zhang,Jiujun Zhang +9 more
TL;DR: In this paper, a comprehensive overview of CO 2 conversion using advanced materials/nanomaterials and technologies for the production of useful fuels/chemicals is provided, and the economic feasibility for CO 2 utilization is analyzed with cases of various chemicals/fuels.
Journal ArticleDOI
Highly Efficient Photoelectrochemical Water Splitting: Surface Modification of Cobalt‐Phosphate‐Loaded Co3O4/Fe2O3 p–n Heterojunction Nanorod Arrays
Journal ArticleDOI
Achieving Insertion-Like Capacity at Ultrahigh Rate via Tunable Surface Pseudocapacitance.
TL;DR: In this paper, surface modified Fe2 O3 quantum dots anchored on graphene nanosheets are developed and exhibit greatly enhanced pseudocapacitance via fast dual-ion-involved redox reactions with both large specific capacity and fast charge/discharge capability.
Journal ArticleDOI
Enhanced charge transfer kinetics of Fe2O3/CdS composite nanorod arrays using cobalt-phosphate as cocatalyst
TL;DR: In this article, a ternary Fe2O3/CdS/Co-Pi nanorod arrays (NRAs) photoanode was designed to boost charge separation and transfer kinetics within the bulk and at the electrode/electrolyte interface.
References
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Journal ArticleDOI
Solar Water Splitting: Progress Using Hematite (α‐Fe2O3) Photoelectrodes
TL;DR: The latest efforts using advanced characterization techniques, particularly electrochemical impedance spectroscopy, are presented to define the obstacles that remain to be surmounted in order to fully exploit the potential of hematite for solar energy conversion.
Journal ArticleDOI
Photo-electrochemical hydrogen generation from water using solar energy. Materials-related aspects
TL;DR: In this paper, the authors focused on the materials-related issues in the development of high-efficiency photo-electrochemical cells (PECs), in terms of semiconducting and electrochemical properties and their impact on the performance of PECs.
Journal ArticleDOI
Sn-Doped Hematite Nanostructures for Photoelectrochemical Water Splitting
TL;DR: Ultrafast spectroscopy studies revealed that there is significant electron-hole recombination within the first few picoseconds, while Sn doping and the change of surface morphology have no major effect on the ultrafast dynamics of the charge carriers on thepicosecond time scales.
Journal ArticleDOI
Photoelectrochemical Water Splitting with Mesoporous Hematite Prepared by a Solution-Based Colloidal Approach
Kevin Sivula,Radek Zboril,Florian Le Formal,R. Robert,Anke Weidenkaff,Jiri Tucek,Jiri Frydrych,Michael Grätzel +7 more
TL;DR: Mesoporous hematite photoelectodes prepared by a solution-based colloidal method which yield water-splitting photocurrents of 0.56 mA cm(-2) under standard conditions and a considerable change in the absorption coefficient and onset properties, critical aspects for hematites as a solar energy converter, as a function of the sintering temperature are revealed.
Journal ArticleDOI
Facile Synthesis of Highly Photoactive α-Fe2O3-Based Films for Water Oxidation
Gongming Wang,Yichuan Ling,Damon A. Wheeler,Kyle E. George,Kimberly Horsley,Clemens Heske,Jin Z. Zhang,Yat Li +7 more
TL;DR: The photoelectrochemical performance of undoped and Ti-doped α-Fe(2)O(3) photoanodes was characterized and optimized through controlled variation of the Fe and Ti precursor concentration, annealing conditions, and the number of DA cycles.