scholarly journals Photocorrosion-Resistant Sb2Se3 Photocathodes with Earth Abundant MoSx Hydrogen Evolution Catalyst

2017 ◽  
Author(s):  
David Tilley ◽  
Rajiv Ramanujam Prabhakar ◽  
Wilman Septina ◽  
Sebastian Siol ◽  
Thomas Moehl ◽  
...  
Keyword(s):  
Low Temperature ◽  
Hydrogen Evolution ◽  
Large Scale ◽  
High Efficiency ◽  
Aqueous Media ◽  
Onset Potential ◽  
Protective Layers ◽  
Earth Abundant ◽  
Strong Candidate ◽  
Holding Back

<p>The poor stability of high efficiency photoabsorber materials in aqueous media is one factor holding back the realization of photoelectrochemical (PEC) water splitting for large scale, practical solar fuels generation. Here, we demonstrate that highly efficient thin film Sb<sub>2</sub>Se<sub>3</sub>–fabricated by a simple, low temperature selenization of electrodeposited Sb–is intrinsically stable towards photocorrosion in strongly acidic media (1 M H<sub>2</sub>SO<sub>4</sub>). Coupling with a photoelectrodeposited MoS<sub>x</sub> hydrogen evolution catalyst gives high photocurrents (5 mA cm<sup>-2</sup> at 0 V vs RHE) and high stability without protective layers (10 h with ~20% loss). A low temperature sulfurization of the Sb<sub>2</sub>Se<sub>3</sub>-MoS<sub>x</sub> stack dramatically improved the onset potential, resulting in high photocurrent densities up to 16 mA cm<sup>-2</sup> at 0 V vs RHE. The simplicity with which these photocathodes are fabricated, combined with the high photocurrents and stability, make Sb<sub>2</sub>Se<sub>3</sub> a strong candidate for scalable PEC cells.</p>

scholarly journals Photocorrosion-Resistant Sb2Se3 Photocathodes with Earth Abundant MoSx Hydrogen Evolution Catalyst

2017 ◽  
Author(s):  
David Tilley ◽  
Rajiv Ramanujam Prabhakar ◽  
Wilman Septina ◽  
Sebastian Siol ◽  
Thomas Moehl ◽  
...  
Keyword(s):  
Low Temperature ◽  
Hydrogen Evolution ◽  
Large Scale ◽  
High Efficiency ◽  
Aqueous Media ◽  
Onset Potential ◽  
Protective Layers ◽  
Earth Abundant ◽  
Strong Candidate ◽  
Holding Back

<p>The poor stability of high efficiency photoabsorber materials in aqueous media is one factor holding back the realization of photoelectrochemical (PEC) water splitting for large scale, practical solar fuels generation. Here, we demonstrate that highly efficient thin film Sb<sub>2</sub>Se<sub>3</sub>–fabricated by a simple, low temperature selenization of electrodeposited Sb–is intrinsically stable towards photocorrosion in strongly acidic media (1 M H<sub>2</sub>SO<sub>4</sub>). Coupling with a photoelectrodeposited MoS<sub>x</sub> hydrogen evolution catalyst gives high photocurrents (5 mA cm<sup>-2</sup> at 0 V vs RHE) and high stability without protective layers (10 h with ~20% loss). A low temperature sulfurization of the Sb<sub>2</sub>Se<sub>3</sub>-MoS<sub>x</sub> stack dramatically improved the onset potential, resulting in high photocurrent densities up to 16 mA cm<sup>-2</sup> at 0 V vs RHE. The simplicity with which these photocathodes are fabricated, combined with the high photocurrents and stability, make Sb<sub>2</sub>Se<sub>3</sub> a strong candidate for scalable PEC cells.</p>

scholarly journals WS(1−x)Sex Nanoparticles Decorated Three-Dimensional Graphene on Nickel Foam: A Robust and Highly Efficient Electrocatalyst for the Hydrogen Evolution Reaction

Nanomaterials ◽  
2018 ◽  
Vol 8 (11) ◽  
pp. 929 ◽  
Author(s):  
Sajjad Hussain ◽  
Kamran Akbar ◽  
Dhanasekaran Vikraman ◽  
Rana Afzal ◽  
Wooseok Song ◽  
...  
Keyword(s):  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Large Scale ◽  
Nickel Foam ◽  
Transition Metal Dichalcogenides ◽  
Three Dimensional ◽  
Cost Effective ◽  
Highly Efficient ◽  
Highly Active ◽  
Earth Abundant

To find an effective alternative to scarce, high-cost noble platinum (Pt) electrocatalyst for hydrogen evolution reaction (HER), researchers are pursuing inexpensive and highly efficient materials as an electrocatalyst for large scale practical application. Layered transition metal dichalcogenides (TMDCs) are promising candidates for durable HER catalysts due to their cost-effective, highly active edges and Earth-abundant elements to replace Pt electrocatalysts. Herein, we design an active, stable earth-abundant TMDCs based catalyst, WS(1−x)Sex nanoparticles-decorated onto a 3D porous graphene/Ni foam. The WS(1−x)Sex/graphene/NF catalyst exhibits fast hydrogen evolution kinetics with a moderate overpotential of ~−93 mV to drive a current density of 10 mA cm−2, a small Tafel slope of ~51 mV dec−1, and a long cycling lifespan more than 20 h in 0.5 M sulfuric acid, which is much better than WS2/NF and WS2/graphene/NF catalysts. Our outcomes enabled a way to utilize the TMDCs decorated graphene and precious-metal-free electrocatalyst as mechanically robust and electrically conductive catalyst materials.

scholarly journals Aromaticity Driven Electrocatalytic Water Oxidation by a Phosphorus-Nitrogen PN3-Pincer Cobalt Complex

2019 ◽  
Author(s):  
Pradip K. Das ◽  
Sarmistha Bhunia ◽  
Priyanka Chakraborty ◽  
Atanu Rana ◽  
Abhishek Dey ◽  
...  
Keyword(s):  
Water Oxidation ◽  
High Efficiency ◽  
Cobalt Complex ◽  
Potential Jump ◽  
Onset Potential ◽  
New Strategy ◽  
Earth Abundant ◽  
High Valent ◽  
Lower Overpotential ◽  
Cobalt Species

Water oxidation is the primary step in both natural and artificial photosynthesis to convert solar energy in into chemical fuels. Herein, we report the first cobalt-based pincer catalyst for electrolytic water oxidation at neutral pH with high efficiency under electrochemical conditions. Most importantly, ligand (pseudo)aromaticity is identified to play an important role in the electrocatalysis. A significant potential jump (~300 mV) was achieved towards a lower positive value when the aromatized cobalt complex was transformed to a (pseudo)dearomatized cobalt species. This complex catalyzes the water oxidation in its high valent oxidation state at a much lower overpotential (~ 340 mV vs. NHE) based on the onset potential (0.5 mA/cm<sup>2</sup>) of catalysis at pH 10.5, outperforming all the other literature systems. These observations may provide a new strategy for the design of earth-abundant transition metal-based water oxidation catalysts.

Fe-Co-P multi-heterostructure arrays for efficient electrocatalytic water splitting

2021 ◽  
Author(s):  
Hanwen Xu ◽  
Jiawei Zhu ◽  
Pengyan Wang ◽  
Ding Chen ◽  
Chengtian Zhang ◽  
...  
Keyword(s):  
Hydrogen Production ◽  
Hydrogen Evolution ◽  
Water Splitting ◽  
Oxygen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Oxygen Evolution Reaction ◽  
Rational Design ◽  
Large Scale ◽  
High Efficiency ◽  
Bifunctional Catalysts

Rational design and construction of high-efficiency bifunctional catalysts for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) is crucial for large-scale hydrogen production by water splitting. Herein, by a...

Low-temperature molten salt synthesis of MoS2@CoS2 heterostructures for efficient hydrogen evolution reaction

2020 ◽  
Vol 56 (41) ◽  
pp. 5548-5551 ◽  
Author(s):  
Song He ◽  
Hongfang Du ◽  
Ke Wang ◽  
Qianchi Liu ◽  
Jinmeng Sun ◽  
...  
Keyword(s):  
Low Temperature ◽  
Molten Salt ◽  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
High Efficiency ◽  
Molten Salt Synthesis

A facile low-temperature molten salt approach has been successfully developed to construct MoS2@CoS2 heterostructures for high-efficiency hydrogen evolution reaction.

Efficient Charge Transfer at a Homogeneously Distributed (NH4)2Mo3S13 / WSe2 Heterojunction for Solar Hydrogen Evolution

2019 ◽  
Author(s):  
Farabi Bozheyev ◽  
Fanxing Xi ◽  
Paul Plate ◽  
Thomas Dittrich ◽  
Sebastian Fiechter ◽  
...  
Keyword(s):  
Hydrogen Evolution ◽  
Large Scale ◽  
Transition Metal Dichalcogenides ◽  
Photocurrent Density ◽  
New Combination ◽  
Solar Hydrogen ◽  
Earth Abundant ◽  
Efficient Charge ◽  
New Finding ◽  
Metal Dichalcogenides

<p></p><p>In the present work we demonstrate a record photocurrent density of 5.6 mA cm<sup>-2</sup> at 0 V<sub>RHE</sub> for WSe<sub>2</sub> photocathodes coated with an effective/earth abundant catalyst - ammonium thiomolybdate (NH<sub>4</sub>)<sub>2</sub>Mo<sub>3</sub>S<sub>13</sub> (ATM). The photocurrent density can be tuned by optimizing the WSe<sub>2</sub> film thickness. The features of this new combination (NH<sub>4</sub>)<sub>2</sub>Mo<sub>3</sub>S<sub>13</sub> / WSe<sub>2</sub> and its performance for solar hydrogen evolution is discussed in the manuscript. Our new finding is that the ATM can be used as a photocatalyst, not only as an electrocatalyst known up to date. The results further expand and develop the field of the transition metal dichalcogenides especially in the context of the solar hydrogen evolution. This work is an important milestone towards large scale photocathodes using earth abundant elements.</p><p></p>

Extracting large photovoltages from a-SiC photocathodes with an amorphous TiO2 front surface field layer for solar hydrogen evolution

2015 ◽  
Vol 8 (5) ◽  
pp. 1585-1593 ◽  
Author(s):  
Ibadillah A. Digdaya ◽  
Lihao Han ◽  
Thom W. F. Buijs ◽  
Miro Zeman ◽  
Bernard Dam ◽  
...  
Keyword(s):  
Hydrogen Evolution ◽  
Front Surface ◽  
Photocurrent Density ◽  
Solar Hydrogen ◽  
Onset Potential ◽  
Field Layer ◽  
Surface Field ◽  
Earth Abundant ◽  
Amorphous Tio2 ◽  
Amorphous Sic

A p–i–n junction photocathode made from 110 nm (p/i) amorphous SiC and an (n) TiO2 top layer leads to an onset potential of +0.8 VRHE and a photocurrent density of 8.3 mA cm−2 at 0 VRHE using only earth abundant materials.

scholarly journals Construction of Ni-Mo-P heterostructures with efficient hydrogen evolution performance under acidic condition

2021 ◽  
Author(s):  
Tian-Yun Chen ◽  
Ya-Qi Zhang ◽  
Ying-Yan Fu ◽  
Min Qian ◽  
Hao-Jiang Dai ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Hydrogen Evolution ◽  
Current Density ◽  
Photoelectron Spectroscopy ◽  
Large Scale ◽  
Clean Energy ◽  
Hydrogen Energy ◽  
Durability Test ◽  
X Ray ◽  
Onset Potential

Abstract Hydrogen energy is regarded as one of the most important clean energy in the 21st century, and improving the catalytic efficiency of hydrogen evolution reaction (HER) is the basis for realizing the large-scale hydrogen production. Transition metal phosphides (TMPs) were proved to be efficient electrocatalysts for HER. In this work, we first synthesized the nickel-molybdenum bimetallic precursors, followed by high-temperature calcination in air. Finally, NiMoP/MoP nanorods (Ni-Mo-P NRs) was obtained by chemical vapor deposition (CVD) of phosphating. The target catalyst of Ni-Mo-P NRs was characterized by transmission electron microscopy (TEM), scanning electron microscopy (SEM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). For Ni-Mo-P NRs, the electrochemical test in 0.5 M H2SO4 solution for HER showed that the optimal feeding ratio was Ni: Mo = 1:1. And the Ni1-Mo1-P NRs presented an onset potential of 63.2 mV, and an overpotential of 117.9 mV was required to drive the current density of 10 mA↔cm− 2. Meanwhile, The Tafel slope, exchange current density (j0), electrochemical double-layer capacitance (Cdl) were 58.6 mV↔dec− 1, 0.10 mA↔cm− 2, 12.6 mF↔cm− 2, respectively. Moreover, there was no obvious activity diminish of Ni1-Mo1-P NRs after a long-term stability and durability test.

2D ultrathin CoP modified MnxCd1−xS with controllable band structure and robust photocatalytic performance for hydrogen generation

2019 ◽  
Vol 48 (39) ◽  
pp. 14783-14791 ◽  
Author(s):  
Ran Chen ◽  
Yanhui Ao ◽  
Chao Wang ◽  
Peifang Wang
Keyword(s):  
Band Structure ◽  
Visible Light ◽  
Hydrogen Evolution ◽  
Visible Light Irradiation ◽  
Photocatalytic Performance ◽  
High Efficiency ◽  
Hydrogen Generation ◽  
Low Cost ◽  
Light Irradiation ◽  
Earth Abundant

Considerable efforts have been directed towards constructing high-efficiency, earth-abundant and low-cost photocatalysts for hydrogen evolution under visible light irradiation.

scholarly journals Investigation of polymer-derived Si–(B)–C–N ceramic/reduced graphene oxide composite systems as active catalysts towards the hydrogen evolution reaction

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Quentin Hanniet ◽  
Moustapha Boussmen ◽  
Jonathan Barés ◽  
Vincent Huon ◽  
Igor Iatsunskyi ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Large Scale ◽  
Renewable Energy Sources ◽  
Chemical Conversion ◽  
Onset Potential ◽  
Electrically Conducting ◽  
Reduced Graphene

AbstractHydrogen Evolution Reaction (HER) is an attractive technology for chemical conversion of energy. Replacement of platinum with inexpensive and stable electrocatalysts remains a major bottleneck hampering large-scale hydrogen production by using clean and renewable energy sources. Here, we report electrocatalytically active and ultra-stable Polymer-Derived Ceramics towards HER. We successfully prepared ultrathin silicon and carbon (Si–C) based ceramic systems supported on electrically conducting 2D reduced graphene oxide (rGO) nanosheets with promising HER activity by varying the nature and the composition of the ceramic with the inclusion of nitrogen, boron and oxygen. Our results suggest that oxygen-enriched Si-B-C-N/rGO composites (O-SiBCN/rGO) display the strongest catalytic activity leading to an onset potential and a Tafel slope of − 340 mV and ~ 120 mV dec−1 respectively. O-SiBCN/rGO electrodes display stability over 170 h with minimal increase of 14% of the overpotential compared to ~ 1700% for commercial platinum nanoparticles. Our study provides new insights on the performance of ceramics as affordable and robust HER catalysts calling for further exploration of the electrocatalytic activity of such unconventional materials.

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