A highly stable CoMo2S4/Ni3S2 heterojunction electrocatalyst for efficient hydrogen evolution

2021 ◽  
Author(s):  
Minmin Wang ◽  
Mengke Zhang ◽  
Wenwu Song ◽  
Weiting Zhong ◽  
Xunyue Wang ◽  
...  
Keyword(s):  
Hydrogen Evolution ◽  
Current Density ◽  
A Current

A CoMo2S4/Ni3S2 heterojunction is prepared with an overpotential of only 51 mV to drive a current density of 10 mA cm−2 in 1 M KOH solution and ∼100% of the potential remains in the ∼50 h chronopotentiometric curve at 10 mA cm−2.

CO2 electrolysis to multicarbon products in strong acid

Science ◽  
2021 ◽  
Vol 372 (6546) ◽  
pp. 1074-1078
Author(s):  
Jianan Erick Huang ◽  
Fengwang Li ◽  
Adnan Ozden ◽  
Armin Sedighian Rasouli ◽  
F. Pelayo García de Arquer ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Hydrogen Evolution ◽  
Current Density ◽  
Carbon Emissions ◽  
Active Sites ◽  
Cell Voltage ◽  
Strong Acid ◽  
Electrochemically Active ◽  
Co2 Electrolysis ◽  
A Current

Carbon dioxide electroreduction (CO2R) is being actively studied as a promising route to convert carbon emissions to valuable chemicals and fuels. However, the fraction of input CO2 that is productively reduced has typically been very low, <2% for multicarbon products; the balance reacts with hydroxide to form carbonate in both alkaline and neutral reactors. Acidic electrolytes would overcome this limitation, but hydrogen evolution has hitherto dominated under those conditions. We report that concentrating potassium cations in the vicinity of electrochemically active sites accelerates CO2 activation to enable efficient CO2R in acid. We achieve CO2R on copper at pH <1 with a single-pass CO2 utilization of 77%, including a conversion efficiency of 50% toward multicarbon products (ethylene, ethanol, and 1-propanol) at a current density of 1.2 amperes per square centimeter and a full-cell voltage of 4.2 volts.

MOF-derived hierarchical 3D bi-doped CoP nanoflower eletrocatalyst for hydrogen evolution reaction in both acidic and alkaline media

2020 ◽  
Vol 56 (56) ◽  
pp. 7702-7705 ◽  
Author(s):  
Lei Guo ◽  
Xue Bai ◽  
Hui Xue ◽  
Jing Sun ◽  
Tianshan Song ◽  
...  
Keyword(s):  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Current Density ◽  
Alkaline Media ◽  
Alkaline Electrolyte ◽  
Acidic Electrolyte ◽  
Acidic And Alkaline Media ◽  
A Current

A 3D hierarchical Bi-doped CoP nanoflowers electrocatalyst is developed based on a MOF self-sacrifice strategy. The 3% Bi/CoP catalyst delivers a current density of 10 mA cm−2 at low overpotentials of 122 mV in alkaline electrolyte and 150 mV in acidic electrolyte.

Gas-templating of hierarchically structured Ni–Co–P for efficient electrocatalytic hydrogen evolution

2017 ◽  
Vol 5 (16) ◽  
pp. 7564-7570 ◽  
Author(s):  
Peili Zhang ◽  
Hong Chen ◽  
Mei Wang ◽  
Yong Yang ◽  
Jian Jiang ◽  
...  
Keyword(s):  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Current Density ◽  
A Current

A hierarchically structured Ni–Co–P film exhibits remarkable activity toward the hydrogen evolution reaction with a current density of −10 mA cm−2 at −30 mV vs. the RHE.

The fabrication of Co:ZnS/CoS2 heterostructure nanowires with a superior hydrogen evolution performance

2019 ◽  
Vol 3 (10) ◽  
pp. 2771-2778 ◽  
Author(s):  
Shancheng Yan ◽  
Ka Wang ◽  
Qingxia Wu ◽  
Fei Zhou ◽  
Zixia Lin ◽  
...  
Keyword(s):  
Hydrothermal Method ◽  
Hydrogen Evolution ◽  
Current Density ◽  
High Hydrogen ◽  
Tafel Slope ◽  
One Step ◽  
A Current

The ultrafine Co:ZnS/CoS2 heterostructure nanowires with high hydrogen evolution performance by one-step hydrothermal method. The overpotential required to reach a current density of 10 mAcm−2 was only 78 mV in 0.5 M H2SO4 solution, and the Tafel slope was 56 mV dec−1.

Effects of Electrodeposition Time on Ni/rGO Composite Electrode as an Efficient Catalyst for Hydrogen Evolution Reaction in Alkaline Media

2018 ◽  
Vol 15 (2) ◽  
pp. 178-187
Author(s):  
Lixin Wang ◽  
Peipei Zhang ◽  
Lei Bai ◽  
Lei Cao ◽  
Jing Du ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Current Density ◽  
Charge Transfer Resistance ◽  
Composite Electrodes ◽  
Transfer Resistance ◽  
Tafel Slope ◽  
Electrodeposition Time ◽  
A Current

Background: Ni/rGO composite electrode has been fabricated by facile supergravity electrodeposition as a low-cost catalyst for efficient hydrogen evolution in alkaline media. In this paper, the electrodeposition time is the main research variable. When the electrodeposition time is 100 minutes, the Ni/rGO-100 catalyst manifests the highest electrocatalytic activity toward the hydrogen evolution reaction (HER). In 1.0 M NaOH solution, the overpotential at a current density of 100 mA cm-2, Tafel slope and charge transfer resistance of Ni/rGO-100 catalyst is 184 mV, 77 mV dec-1 and 4.173 &#937;, respectively. In addition, Ni/rGO-100 catalyst shows a long-term durability at a constant current density of 100 mA cm-2 for 10 h. The outstanding HER electrocatalytic performance of the Ni/rGO-100 is mainly related to the synergetic combination of Ni and rGO, as well as the enlarged exposure of catalytically active sites and improved transport of electrons arising from the good conductivity of graphene. Method: In a classic experiment, GO was prepared by modified Hummers method. The Ni/rGO composite electrodes were prepared by supergravity electrodeposition, which has been reported in detail in our published paper. Firstly, a &#248;10 cm &#215; 2 cm Ni foam circle was cleaned sequentially in HCl solution (15%), acetone and DI water for 5 min with ultrasonication to be used as a cathode. And a pure nickel pipe was used as anode. The Ni/rGO composite cathodes were electrodeposited in a blackish green plating bath which contained 350 g L-1 Ni(NH2SO3)2·6H2O, 10g L-1 NiCl2·6H2O, 30 g L-1 NH4Cl , 1.0 g L-1 GO colloidal solution with different electrodeposition time, 10min, 30min, 60min, 80min, 100min, respectively. The pH value of the plating bath is 3.5-3.8. The above five electrodes were respectively denominated as Ni/rGO-10, Ni/rGO-30, Ni/rGO-60, Ni/rGO-80, Ni/rGO-100. All composite electrodes were performed under the strength of the supergravity with G=350 g at a current density of 3 A dm-2 at 318 K. Afterwards the Ni foam coated with Ni/rGO hybrid was taken out of the reaction vessel, followed by washing with deionized water to remove physical adsorption residua, and then dried at 80&#176;C. Results: In this paper, the electrodeposition time is the main research variable. When the electrodeposition time is 100 minutes, the Ni/rGO-100 catalyst manifests the highest electrocatalytic activity toward the hydrogen evolution reaction (HER). In 1.0 M NaOH solution, the overpotential at a current density of 100 mA cm-2, Tafel slope and charge transfer resistance of Ni/rGO-100 catalyst is 184 mV, 77 mV dec-1 and 4.173 &#937;, respectively. In summary, we have synthesized a class of composite electrodes (Ni/rGO) for HER in alkaline solution by electrodeposition under supergravity field. We studied the effect of electrodeposition time on electrode performance in detail. With the increase of electrodeposition time, the number of active sites is enlarged provided by the electrode. When the electrodeposition time is 100 min, we fabricate the best electrode (Ni/rGO-100). The &#951;100, Tafel slope and charge transfer resistance of Ni/rGO-100 is 184 mV, 77 mV dec-1 and 4.173 &#937;, respectively. The introduction of graphene and supergravity field plays a key role in improving the performance of the electrodes. This work is a pivotal part of the development of Ni/rGO as a non-precious HER catalyst for green energy field.

Enhanced electrochemical oxygen and hydrogen evolution reactions using an NU-1000@NiMn-LDHS composite electrode in alkaline electrolyte

2020 ◽  
Vol 56 (49) ◽  
pp. 6652-6655 ◽  
Author(s):  
Soheila Sanati ◽  
Reza Abazari ◽  
Ali Morsali
Keyword(s):  
Hydrogen Evolution ◽  
Current Density ◽  
Composite Electrode ◽  
Alkaline Electrolyte ◽  
Electrocatalytic Performance ◽  
Hydrogen Evolution Reactions ◽  
A Current ◽  
Electrochemical Oxygen

A well-designed NU-1000@NiMn-LDHS (NU@LDHS) composite can offer efficient electrocatalytic performance with ultralow HER and OER overpotentials of 93 and 129 mV, respectively, at a current density of 10 mA cm−2 in 2 M KOH.

Pt-like catalytic behavior of MoNi decorated CoMoO3 cuboid arrays for the hydrogen evolution reaction

2018 ◽  
Vol 6 (32) ◽  
pp. 15558-15563 ◽  
Author(s):  
Dewen Wang ◽  
Ce Han ◽  
Zhicai Xing ◽  
Qun Li ◽  
Xiurong Yang
Keyword(s):  
Synergistic Effect ◽  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Current Density ◽  
High Hydrogen ◽  
Catalytic Behavior ◽  
Unique Structure ◽  
Low Overpotential ◽  
A Current

Owing to the unique structure and synergistic effect between MoNi and CoMoO3, the MoNi/CoMoO3/NF exhibits high hydrogen evolution activity which requires a low overpotential of only 18 mV to deliver a current density of 10 mA cm−2.

Controllable synthesis of Ni3S2@MOOH/NF (M = Fe, Ni, Cu, Mn and Co) hybrid structure for the efficient hydrogen evolution reaction

2021 ◽  
Vol 50 (39) ◽  
pp. 14001-14008
Author(s):  
Xiaoqiang Du ◽  
Guangyu Ma ◽  
Yanhong Wang ◽  
Xinghua Han ◽  
Xiaoshuang Zhang
Keyword(s):  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Current Density ◽  
Shell Structure ◽  
Hybrid Structure ◽  
Core Shell ◽  
Controllable Synthesis ◽  
Catalytic Activities ◽  
Core Shell Structure ◽  
A Current

The Ni3S2@NiOOH/NF catalyst with a core–shell structure exhibits a relatively low overpotential of 79 mV for HER at a current density of 10 mA cm−2, which is one of the best catalytic activities reported so far.

3D hierarchical Co3O4@Co3S4 nanoarrays as anode and cathode materials for oxygen evolution reaction and hydrogen evolution reaction

2018 ◽  
Vol 47 (45) ◽  
pp. 16305-16312 ◽  
Author(s):  
Xiaoqiang Du ◽  
Hui Su ◽  
Xiaoshuang Zhang
Keyword(s):  
Hydrogen Evolution ◽  
Water Splitting ◽  
Oxygen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Current Density ◽  
Cathode Materials ◽  
Oxygen Evolution Reaction ◽  
Cell Voltage ◽  
A Current

Using Co3O4@Co3S4-24 h as a bifunctional water splitting catalyst, an overpotential of ∼300 mV is obtained at a very low cell voltage of 1.53 V with a current density of 10 mA cm−2 in 1.0 M KOH.

A 3D porous Ni-CeO2 nanosheet array as a highly efficient electrocatalyst toward alkaline hydrogen evolution

2018 ◽  
Vol 47 (36) ◽  
pp. 12667-12670 ◽  
Author(s):  
Zhaomei Sun ◽  
Jiayu Zhang ◽  
Junfeng Xie ◽  
Min Wang ◽  
Xiangjiang Zheng ◽  
...  
Keyword(s):  
Hydrogen Evolution ◽  
Current Density ◽  
Highly Efficient ◽  
Nanosheet Array ◽  
A Current ◽  
Ti Mesh

A 3D porous Ni-CeO2 nanosheet array supported on a Ti mesh (Ni-CeO2/TM) behaves as an efficient and stable alkaline HER electrocatalyst, offering a current density of 10 mA cm−2 at an overpotential of 67 mV.

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