The Experts below are selected from a list of 324 Experts worldwide ranked by ideXlab platform
Wenzhen Li - One of the best experts on this subject based on the ideXlab platform.
-
electrocatalytic oxygen evolution over supported small amorphous ni fe nanoparticles in Alkaline Electrolyte
Langmuir, 2014Co-Authors: Wenzhen LiAbstract:The electrocatalytic oxygen evolution reaction (OER) is a critical anode reaction often coupled with electron or photoelectron CO2 reduction and H2 evolution reactions at the cathode for renewable energy conversion and storage. However, the sluggish OER kinetics and the utilization of precious metal catalysts are key obstacles in the broad deployment of these energy technologies. Herein, inexpensive supported 4 nm Ni–Fe nanoparticles (NiyFe1–yOx/C) featuring amorphous structures have been prepared via a solution-phase nanocapsule method for active and durable OER electrocatalysts in Alkaline Electrolyte. The Ni–Fe nanoparticle catalyst containing 31% Fe (Ni0.69Fe0.31Ox/C) shows the highest activity, exhibiting a 280 mV overpotential at 10 mA cm–2 (equivalent to 10% efficiency of solar-to-fuel conversion) and a Tafel slope of 30 mV dec–1 in 1.0 M KOH solution. The achieved OER activity outperforms NiOx/C and commercial Ir/C catalysts and is close to the highest performance of crystalline Ni–Fe thin films r...
-
Electrocatalytic oxygen evolution over supported small amorphous ni-fe nanoparticles in Alkaline Electrolyte
Langmuir, 2014Co-Authors: Yang Qiu, Le Xin, Wenzhen LiAbstract:The electrocatalytic oxygen evolution reaction (OER) is a critical anode reaction often coupled with electron or photoelectron CO2 reduction and H2 evolution reactions at the cathode for renewable energy conversion and storage. However, the sluggish OER kinetics and the utilization of precious metal catalysts are key obstacles in the broad deployment of these energy technologies. Herein, inexpensive supported 4 nm Ni-Fe nanoparticles (NiyFe1-yOx/C) featuring amorphous structures have been prepared via a solution-phase nanocapsule method for active and durable OER electrocatalysts in Alkaline Electrolyte. The Ni-Fe nanoparticle catalyst containing 31% Fe (Ni0.69Fe0.31Ox/C) shows the highest activity, exhibiting a 280 mV overpotential at 10 mA cm(-2) (equivalent to 10% efficiency of solar-to-fuel conversion) and a Tafel slope of 30 mV dec(-1) in 1.0 M KOH solution. The achieved OER activity outperforms NiOx/C and commercial Ir/C catalysts and is close to the highest performance of crystalline Ni-Fe thin films reported in the literature. In addition, a Faradaic efficiency of 97% measured on Ni0.69Fe0.31Ox/C suggests that carbon support corrosion and further oxidation of nanoparticle catalysts are negligible during the electrocatalytic OER tests. Ni0.69Fe0.31Ox/C further demonstrates high stability as there is no apparent OER activity loss (based on a chronoamperometry test) or particle aggregation (based on TEM image observation) after a 6 h anodization test. The high efficiency and durability make these supported amorphous Ni-Fe nanoparticles potentially applicable in the (photo)electrochemical cells for water splitting to make H2 fuel or CO2 reduction to produce usable fuels and chemicals.
-
selective electro conversion of glycerol to glycolate on carbon nanotube supported gold catalyst
Green Chemistry, 2012Co-Authors: Zhiyong Zhang, Ji Qi, Zhichao Wang, Wenzhen LiAbstract:Glycerol is electro-converted to glycolate with 85% selectivity on carbon nanotube supported Au catalyst (Au/CNT) in Alkaline Electrolyte at 1.6 V (vs. SHE) under mild reaction conditions (room temperature, atmosphere pressure, water as solvent).
-
pd ni electrocatalysts for efficient ethanol oxidation reaction in Alkaline Electrolyte
International Journal of Hydrogen Energy, 2011Co-Authors: Zhiyong Zhang, Wenzhen LiAbstract:Abstract PdxNiy/C catalysts with high ethanol oxidation reaction (EOR) activity in Alkaline solution have been prepared through a solution phase-based nanocapsule method. XRD and TEM show PdxNiy nanoparticles with a small average diameter (2.4–3.2 nm) and narrow size distribution (1–6 nm) were homogeneously dispersed on carbon black XC-72 support. The EOR onset potential on Pd4Ni5/C (−801 mV vs. Hg/HgO) was observed shifted 180 mV more negative than that of Pd/C. Its exchange current density was 33 times higher than that of Pd/C (41.3 × 10−7 A/cm2 vs. 1.24 × 10−7 A/cm2). After a 10,000-s chronoamperometry test at −0.5 V (vs Hg/HgO), the EOR mass activity of Pd2Ni3/C survived at 1.71 mA/mg, while that of Pd/C had dropped to 0, indicating PdxNiy/C catalysts have a better ’detoxification’ ability for EOR than Pd/C. We propose that surface Ni could promote refreshing Pd active sites, thus enhancing the overall ethanol oxidation kinetics. The nanocapsule method is able to not only control over the diameter and size distribution of Pd–Ni particles, but also facilitate the formation of more efficient contacts between Pd and Ni on the catalyst surface, which is the key to improving the EOR activity.
F C Walsh - One of the best experts on this subject based on the ideXlab platform.
-
The specific capacitance of sol–gel synthesised spinel MnCo2O4 in an Alkaline Electrolyte
Electrochimica Acta, 2020Co-Authors: Lingbin Kong, Chao Lu, Long Kang, Xiaohong Li, F C WalshAbstract:Abstract In this work, high performance spinel MnCo 2 O 4 electrode was fabricated via a facile sol–gel method and its capacitive behavior was successfully investigated in Alkaline Electrolyte. MnCo 2 O 4 electrode was characterized by means of powder X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscope (TEM). The pseudo capacitive behavior of spinel MnCo 2 O 4 was widely investigated in 2 M KOH aqueous Electrolyte using cyclic voltammetry (CV), galvanostatic charge-discharge test, and electrochemical impedance spectroscopy (EIS). As a result, the spinel MnCo 2 O 4 exhibited excellent porous structure and the highest specific capacitance of 405 F g −1 was achieved at a current density of 5 mA cm −2 . In addition, the spinel MnCo 2 O 4 displayed desirable stability in Alkaline Electrolyte during long-term cycles with a cycling efficiency of 95.1% over 1,000 cycles. The high specific capacitance and excellent cycling ability of MnCo 2 O 4 show promise for its application in supercapacitors.
-
the specific capacitance of sol gel synthesised spinel mnco2o4 in an Alkaline Electrolyte
Electrochimica Acta, 2014Co-Authors: Lingbin Kong, Chao Lu, Long Kang, Xiaohong Li, F C WalshAbstract:Abstract In this work, high performance spinel MnCo 2 O 4 electrode was fabricated via a facile sol–gel method and its capacitive behavior was successfully investigated in Alkaline Electrolyte. MnCo 2 O 4 electrode was characterized by means of powder X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscope (TEM). The pseudo capacitive behavior of spinel MnCo 2 O 4 was widely investigated in 2 M KOH aqueous Electrolyte using cyclic voltammetry (CV), galvanostatic charge-discharge test, and electrochemical impedance spectroscopy (EIS). As a result, the spinel MnCo 2 O 4 exhibited excellent porous structure and the highest specific capacitance of 405 F g −1 was achieved at a current density of 5 mA cm −2 . In addition, the spinel MnCo 2 O 4 displayed desirable stability in Alkaline Electrolyte during long-term cycles with a cycling efficiency of 95.1% over 1,000 cycles. The high specific capacitance and excellent cycling ability of MnCo 2 O 4 show promise for its application in supercapacitors.
Rongming Wang - One of the best experts on this subject based on the ideXlab platform.
-
enhanced catalytic activities of nipt truncated octahedral nanoparticles toward ethylene glycol oxidation and oxygen reduction in Alkaline Electrolyte
ACS Applied Materials & Interfaces, 2016Co-Authors: Shouguo Wang, Lin Gu, Chao Wang, Rongming WangAbstract:The high cost and poor durability of Pt nanoparticles (NPs) are great limits for the proton exchange membrane fuel cells (PEMFCs) from being scaled-up for commercial applications. Pt-based bimetallic NPs together with a uniform distribution can effectively reduce the usage of expensive Pt while increasing poison resistance of intermediates. In this work, a simple one-pot method was used to successfully synthesize ultrafine (about 7.5 nm) uniform NiPt truncated octahedral nanoparticles (TONPs) in dimethylformamid (DMF) without any seeds or templates. The as-prepared NiPt TONPs with Pt-rich surfaces exhibit greatly improved catalytic activities together with good tolerance and better stability for ethylene glycol oxidation reaction (EGOR) and oxygen reduction reaction (ORR) in comparison with NiPt NPs and commercial Pt/C catalysts in Alkaline Electrolyte. For example, the value of mass and specific activities for EGOR are 23.2 and 17.6 times higher comparing with those of commercial Pt/C, respectively. Our ...
-
Enhanced Catalytic Activities of NiPt Truncated Octahedral Nanoparticles toward Ethylene Glycol Oxidation and Oxygen Reduction in Alkaline Electrolyte
ACS Applied Materials and Interfaces, 2016Co-Authors: Tianyu Xia, Young Sun, Jialong Liu, Shouguo Wang, Lin Gu, Chao Wang, Rongming WangAbstract:The high cost and poor durability of Pt nanoparticles (NPs) are great limits for the proton exchange membrane fuel cells (PEMFCs) from being scaled-up for commercial applications. Pt-based bimetallic NPs together with a uniform distribution can effectively reduce the usage of expensive Pt while increasing poison resistance of intermediates. In this work, a simple one-pot method was used to successfully synthesize ultrafine (about 7.5 nm) uniform NiPt truncated octahedral nanoparticles (TONPs) in dimethylformamid (DMF) without any seeds or templates. The as-prepared NiPt TONPs with Pt-rich surfaces exhibit greatly improved catalytic activities together with good tolerance and better stability for ethylene glycol oxidation reaction (EGOR) and oxygen reduction reaction (ORR) in comparison with NiPt NPs and commercial Pt/C catalysts in Alkaline Electrolyte. For example, the value of mass and specific activities for EGOR are 23.2 and 17.6 times higher comparing with those of commercial Pt/C, respectively. Our results demonstrate that the dramatic enhancement is mainly attributed to Pt-rich surface, larger specific surface area, together with coupling between Ni and Pt atoms. This developed method provides a promising pathway for simple preparation of highly efficient electrocatalysts for PEMFCs in the near future.
Yang Qiu - One of the best experts on this subject based on the ideXlab platform.
-
Electrocatalytic oxygen evolution over supported small amorphous ni-fe nanoparticles in Alkaline Electrolyte
Langmuir, 2014Co-Authors: Yang Qiu, Le Xin, Wenzhen LiAbstract:The electrocatalytic oxygen evolution reaction (OER) is a critical anode reaction often coupled with electron or photoelectron CO2 reduction and H2 evolution reactions at the cathode for renewable energy conversion and storage. However, the sluggish OER kinetics and the utilization of precious metal catalysts are key obstacles in the broad deployment of these energy technologies. Herein, inexpensive supported 4 nm Ni-Fe nanoparticles (NiyFe1-yOx/C) featuring amorphous structures have been prepared via a solution-phase nanocapsule method for active and durable OER electrocatalysts in Alkaline Electrolyte. The Ni-Fe nanoparticle catalyst containing 31% Fe (Ni0.69Fe0.31Ox/C) shows the highest activity, exhibiting a 280 mV overpotential at 10 mA cm(-2) (equivalent to 10% efficiency of solar-to-fuel conversion) and a Tafel slope of 30 mV dec(-1) in 1.0 M KOH solution. The achieved OER activity outperforms NiOx/C and commercial Ir/C catalysts and is close to the highest performance of crystalline Ni-Fe thin films reported in the literature. In addition, a Faradaic efficiency of 97% measured on Ni0.69Fe0.31Ox/C suggests that carbon support corrosion and further oxidation of nanoparticle catalysts are negligible during the electrocatalytic OER tests. Ni0.69Fe0.31Ox/C further demonstrates high stability as there is no apparent OER activity loss (based on a chronoamperometry test) or particle aggregation (based on TEM image observation) after a 6 h anodization test. The high efficiency and durability make these supported amorphous Ni-Fe nanoparticles potentially applicable in the (photo)electrochemical cells for water splitting to make H2 fuel or CO2 reduction to produce usable fuels and chemicals.
Lingbin Kong - One of the best experts on this subject based on the ideXlab platform.
-
The specific capacitance of sol–gel synthesised spinel MnCo2O4 in an Alkaline Electrolyte
Electrochimica Acta, 2020Co-Authors: Lingbin Kong, Chao Lu, Long Kang, Xiaohong Li, F C WalshAbstract:Abstract In this work, high performance spinel MnCo 2 O 4 electrode was fabricated via a facile sol–gel method and its capacitive behavior was successfully investigated in Alkaline Electrolyte. MnCo 2 O 4 electrode was characterized by means of powder X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscope (TEM). The pseudo capacitive behavior of spinel MnCo 2 O 4 was widely investigated in 2 M KOH aqueous Electrolyte using cyclic voltammetry (CV), galvanostatic charge-discharge test, and electrochemical impedance spectroscopy (EIS). As a result, the spinel MnCo 2 O 4 exhibited excellent porous structure and the highest specific capacitance of 405 F g −1 was achieved at a current density of 5 mA cm −2 . In addition, the spinel MnCo 2 O 4 displayed desirable stability in Alkaline Electrolyte during long-term cycles with a cycling efficiency of 95.1% over 1,000 cycles. The high specific capacitance and excellent cycling ability of MnCo 2 O 4 show promise for its application in supercapacitors.
-
the specific capacitance of sol gel synthesised spinel mnco2o4 in an Alkaline Electrolyte
Electrochimica Acta, 2014Co-Authors: Lingbin Kong, Chao Lu, Long Kang, Xiaohong Li, F C WalshAbstract:Abstract In this work, high performance spinel MnCo 2 O 4 electrode was fabricated via a facile sol–gel method and its capacitive behavior was successfully investigated in Alkaline Electrolyte. MnCo 2 O 4 electrode was characterized by means of powder X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscope (TEM). The pseudo capacitive behavior of spinel MnCo 2 O 4 was widely investigated in 2 M KOH aqueous Electrolyte using cyclic voltammetry (CV), galvanostatic charge-discharge test, and electrochemical impedance spectroscopy (EIS). As a result, the spinel MnCo 2 O 4 exhibited excellent porous structure and the highest specific capacitance of 405 F g −1 was achieved at a current density of 5 mA cm −2 . In addition, the spinel MnCo 2 O 4 displayed desirable stability in Alkaline Electrolyte during long-term cycles with a cycling efficiency of 95.1% over 1,000 cycles. The high specific capacitance and excellent cycling ability of MnCo 2 O 4 show promise for its application in supercapacitors.
