Design of ultralong single-crystal nanowire-based bifunctional electrodes for efficient oxygen and hydrogen evolution in a mild alkaline electrolyte

2017 ◽  
Vol 5 (22) ◽  
pp. 10895-10901 ◽  
Author(s):  
Ge Li ◽  
Xiaolei Wang ◽  
Min Ho Seo ◽  
Sahar Hemmati ◽  
Aiping Yu ◽  
...  
Keyword(s):  
Single Crystal ◽  
Hydrogen Evolution ◽  
Zno Nanowires ◽  
Alkaline Electrolyte ◽  
Hydrogen Evolution Reactions ◽  
Doped Zno ◽  
Co Doped

A 3D flexible bifunctional electrode based on ultralong single-crystal Co-doped ZnO nanowires has been successfully designed and developed for efficient oxygen and hydrogen evolution reactions.

scholarly journals Investigations on the Redox Characteristics and Hydrogen Evolution Efficiencies of Pd and Mo Deposited Pd Electrodes in Alkaline Electrolyte

1970 ◽  
Vol 43 (1) ◽  
pp. 103-116 ◽  
Author(s):  
M Ashraful Islam Molla ◽  
Mithun Sarker ◽  
AKM Fazle Kibria
Keyword(s):  
Hydrogen Evolution ◽  
Hydrogen Adsorption ◽  
Stable Condition ◽  
Alkaline Electrolyte ◽  
Potential Range ◽  
Cyclic Voltammograms ◽  
Absorption Region ◽  
Potential Value ◽  
Density Values ◽  
Hydrogen Evolution Reactions

Redox behaviors and hydrogen evolution efficiencies of Pd and Mo deposited Pd electrodes have been investigated in 30wt.% KOH electrolyte by cyclic voltammetry. Cyclic voltammograms of Pd electrode in between the potential range - 1.05 V to + 0.75 V showed two couples of redox peaks for the transformations of Pd(0) ←→ Pd(OH)2 and Pd(OH)2 ←→ PdOOH, an anodic peak for the desorption of diffusional hydrogen (dH) and hydrogen and oxygen evolutions at the terminal potential regions. Hydrogen evolution efficiency found decreased with time and then reached to a stable condition after 35 minutes. In presence of deposited Mo, the electrode stable condition appeared after 10 minutes only. Pd found predominates over deposited Mo. Both the Pd(0) ←Pd(OH)2 and Mo(0) ← Mo(OH)2 transformations appeared at the same potential value. Mo stopped the movement of hydrogen adsorption and absorption region of Pd electrode towards negative potential direction. It increased the hydrogen evolution efficiency of Pd electrode remarkably. At the potentials - 1.1 V, - 1.2 V, - 1.25 V and - 1.3 V, currents for Pd + Mo system found 1.44, 1.25, 1.20, 1.23 times higher than those of Pd electrode. Mo also showed hydrogen migratory role to the fraction of Pd surface covered by it. Hydrogen evolution reactions (HER) over Pd and Pd + Mo surfaces seemed followed similar mechanisms. Tafel plots for the HER for both the systems showed two Tafel regions. Exchange current density values (io) for the low and high overpotential regions of Pd + Mo system showed 2.85 times and 1.29 times higher values than those of Pd electrode. Key words: Pd, Pd-Mo, Hydrogen evolution efficiency, Hydrogen evolution reactions (HER) DOI: 10.3329.bjsir.v43i1.861 Bangladesh J. Sci. Ind. Res. 43(1), 103-116, 2008

Nitrogen and sulfur co-doped porous carbon derived from human hair as highly efficient metal-free electrocatalysts for hydrogen evolution reactions

2015 ◽  
Vol 3 (16) ◽  
pp. 8840-8846 ◽  
Author(s):  
Xiaojun Liu ◽  
Weijia Zhou ◽  
Linjing Yang ◽  
Ligui Li ◽  
Zhenyuan Zhang ◽  
...  
Keyword(s):  
High Activity ◽  
Hydrogen Evolution ◽  
Porous Carbon ◽  
Human Hair ◽  
Metal Free ◽  
Highly Efficient ◽  
Hydrogen Evolution Reactions ◽  
Co Doped

N and S co-doped porous carbon derived from human hair exhibited high activity as stable metal-free electrocatalysts for HER, OER and ORR.

Influence of Co Content on Raman and Photoluminescence Spectra of Co Doped ZnO Nanowires

2012 ◽  
Vol 28 (4) ◽  
pp. 313-316 ◽  
Author(s):  
Y.Q. Chang ◽  
P.W. Wang ◽  
S.L. Ni ◽  
Y. Long ◽  
X.D. Li
Keyword(s):  
Zno Nanowires ◽  
Photoluminescence Spectra ◽  
Doped Zno ◽  
Co Doped

Intense intra-3d luminescence and waveguide properties of single Co-doped ZnO nanowires

2013 ◽  
Vol 7 (10) ◽  
pp. 886-889 ◽  
Author(s):  
Sebastian Geburt ◽  
Robert Röder ◽  
Uwe Kaiser ◽  
Limei Chen ◽  
Manh-Hung Chu ◽  
...  
Keyword(s):  
Zno Nanowires ◽  
Doped Zno ◽  
Co Doped

DEFECT FORMATION AND MAGNETIC PROPERTIES OF Co-DOPED ZnO NANOWIRES

NANO ◽  
2013 ◽  
Vol 08 (02) ◽  
pp. 1350021 ◽  
Author(s):  
LI BIN SHI ◽  
GUO QUAN QI ◽  
YING FEI
Keyword(s):  
Magnetic Properties ◽  
Density Functional ◽  
Defect Formation ◽  
Density Functional Method ◽  
Zno Nanowires ◽  
Generalized Gradient ◽  
Surface Sites ◽  
Doped Zno ◽  
Formation Energies ◽  
Co Doped

The defect formation energies and magnetic properties in Co -doped ZnO nanowires (NWs) are studied using the first-principle density functional method within the generalized gradient approximation (GGA) and GGA + U schemes. It is found that Co impurity has lower formation energies in the surface sites, indicating that Co impurity occupies preferably surface sites of NWs. Ferromagnetic (FM) and antiferromagnetic (AFM) coupling are investigated by GGA and GGA + U methods. The results show that the AFM coupling in energy is lower than the FM coupling, which indicates that AFM coupling is more stable. The magnetic properties can be mediated by the vacancies [ VO(B) and VZn(B) ] and interstitials [ IZn(oct) ]. The stability of the FM and AFM can be explained by the Co 3d energy level coupling.

Enhanced electron-mediated ferromagnetism in Co-doped ZnO nanowires

2010 ◽  
Vol 108 (2) ◽  
pp. 023904 ◽  
Author(s):  
Eun-Ae Choi ◽  
Woo-Jin Lee ◽  
K. J. Chang
Keyword(s):  
Zno Nanowires ◽  
Doped Zno ◽  
Co Doped

Unification of catalytic oxygen reduction and hydrogen evolution reactions: highly dispersive Co nanoparticles encapsulated inside Co and nitrogen co-doped carbon

2015 ◽  
Vol 51 (43) ◽  
pp. 8942-8945 ◽  
Author(s):  
Y. Wang ◽  
Y. Nie ◽  
W. Ding ◽  
S. G. Chen ◽  
K. Xiong ◽  
...  
Keyword(s):  
Oxygen Reduction ◽  
Hydrogen Evolution ◽  
Homogenous Distribution ◽  
Hydrogen Evolution Reactions ◽  
Co Nanoparticles ◽  
Carbon Catalysts ◽  
Co Doped

The elaborately synthesized Co nanoparticles encapsulated inside Co and nitrogen co-doped carbon catalysts with homogenous distribution of Co NPs exhibit evidently outstanding performances toward ORR/HER.

scholarly journals ZnO nanowires array grown on Ga-doped ZnO single crystal for dye-sensitized solar cells

2015 ◽  
Vol 5 (1) ◽  
Author(s):  
Qichang Hu ◽  
Yafeng Li ◽  
Feng Huang ◽  
Zhaojun Zhang ◽  
Kai Ding ◽  
...  
Keyword(s):  
Solar Cells ◽  
Single Crystal ◽  
Dye Sensitized Solar Cells ◽  
Zno Nanowires ◽  
Dye Sensitized ◽  
Doped Zno ◽  
Zno Single Crystal ◽  
Sensitized Solar Cells ◽  
Nanowires Array
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