scholarly journals Highly Active Deficient Ternary Sulfide Photoanode for Photoelectrochemical Water Splitting

2020 ◽  
Author(s):  
Haimei Wang ◽  
Yuguo Xia ◽  
Haiping Li ◽  
Xiang Wang ◽  
Yuan Yu ◽  
...  
Keyword(s):  
Water Splitting ◽  
Active Sites ◽  
High Efficiency ◽  
Theoretical Calculations ◽  
Metal Sulfide ◽  
Surface States ◽  
Photocurrent Density ◽  
Highly Active ◽  
Ternary Sulfide ◽  
Ternary Metal

<div>The exploration of photoanode materials with high efficiency and stability is the </div><div>eternal pursuit for the realization of practically solar-driven photoelectrochemical </div><div>water splitting. Here we develop a novel deficient ternary metal sulfide (CdIn2S4) </div><div>as photoanode, and its PEC performance is significantly enhanced by introducing </div><div>surface S vacancies, achieving a photocurrent density of 5.73 mA cm-2 at 1.23 V vs. </div><div>RHE and 1 Sun and an applied bias photon-to-current efficiency of 2.49% at 0.477 </div><div>V vs. RHE, which, to the best of our knowledge, are the record-high values for a </div><div>single sulfide photon absorber to date. The experimental characterizations and </div><div>theoretical calculations highlight the enhanced effect of surface S vacancies on the </div><div>interfacial charge separation and transfer kinetics, and also demonstrate the </div><div>restrained surface states distribution and the transformation of active sites after </div><div>introducing surface S vacancies. This work may inspire more excellent work on </div><div>developing sulfide-based photoanodes. </div>

scholarly journals Highly Active Deficient Ternary Sulfide Photoanode for Photoelectrochemical Water Splitting

2020 ◽  
Author(s):  
Haimei Wang ◽  
Yuguo Xia ◽  
Haiping Li ◽  
Xiang Wang ◽  
Yuan Yu ◽  
...  
Keyword(s):  
Water Splitting ◽  
Active Sites ◽  
High Efficiency ◽  
Theoretical Calculations ◽  
Metal Sulfide ◽  
Surface States ◽  
Photocurrent Density ◽  
Highly Active ◽  
Ternary Sulfide ◽  
Ternary Metal

<div>The exploration of photoanode materials with high efficiency and stability is the </div><div>eternal pursuit for the realization of practically solar-driven photoelectrochemical </div><div>water splitting. Here we develop a novel deficient ternary metal sulfide (CdIn2S4) </div><div>as photoanode, and its PEC performance is significantly enhanced by introducing </div><div>surface S vacancies, achieving a photocurrent density of 5.73 mA cm-2 at 1.23 V vs. </div><div>RHE and 1 Sun and an applied bias photon-to-current efficiency of 2.49% at 0.477 </div><div>V vs. RHE, which, to the best of our knowledge, are the record-high values for a </div><div>single sulfide photon absorber to date. The experimental characterizations and </div><div>theoretical calculations highlight the enhanced effect of surface S vacancies on the </div><div>interfacial charge separation and transfer kinetics, and also demonstrate the </div><div>restrained surface states distribution and the transformation of active sites after </div><div>introducing surface S vacancies. This work may inspire more excellent work on </div><div>developing sulfide-based photoanodes. </div>

scholarly journals High-Index-Faceted Ni3S2 Branch Arrays as Bifunctional Electrocatalysts for Efficient Water Splitting

2019 ◽  
Vol 11 (1) ◽  
Author(s):  
Shengjue Deng ◽  
Kaili Zhang ◽  
Dong Xie ◽  
Yan Zhang ◽  
Yongqi Zhang ◽  
...  
Keyword(s):  
Water Splitting ◽  
Active Sites ◽  
Large Scale ◽  
High Efficiency ◽  
Hydrogen Generation ◽  
Metal Sulfide ◽  
Value Added ◽  
Active Surface ◽  
High Index ◽  
Active Surface Area

Abstract For efficient electrolysis of water for hydrogen generation or other value-added chemicals, it is highly relevant to develop low-temperature synthesis of low-cost and high-efficiency metal sulfide electrocatalysts on a large scale. Herein, we construct a new core–branch array and binder-free electrode by growing Ni3S2 nanoflake branches on an atomic-layer-deposited (ALD) TiO2 skeleton. Through induced growth on the ALD-TiO2 backbone, cross-linked Ni3S2 nanoflake branches with exposed {$$\bar{2}10$$ 2 ¯ 10 } high-index facets are uniformly anchored to the preformed TiO2 core forming an integrated electrocatalyst. Such a core–branch array structure possesses large active surface area, uniform porous structure, and rich active sites of the exposed {$$\bar{2}10$$ 2 ¯ 10 } high-index facet in the Ni3S2 nanoflake. Accordingly, the TiO2@Ni3S2 core/branch arrays exhibit remarkable electrocatalytic activities in an alkaline medium, with lower overpotentials for both oxygen evolution reaction (220 mV at 10 mA cm−2) and hydrogen evolution reaction (112 mV at 10 mA cm−2), which are better than those of other Ni3S2 counterparts. Stable overall water splitting based on this bifunctional electrolyzer is also demonstrated.

Cathodic Corrosion Activated Fe-based Nanoglass as Highly-Active and -Stable Oxygen Evolution Catalyst for Water Splitting

2021 ◽  
Author(s):  
Kaiyao Wu ◽  
Fei Chu ◽  
Yuying Meng ◽  
Kaveh Edalati ◽  
Qingsheng Gao ◽  
...  
Keyword(s):  
Water Splitting ◽  
Oxygen Evolution ◽  
Oxygen Evolution Reaction ◽  
Amorphous Alloys ◽  
Precious Metal ◽  
Active Sites ◽  
Metal Free ◽  
Highly Active ◽  
Stable Oxygen ◽  
Surface Active

Transition metal-based amorphous alloys have attracted increasing attention as precious-metal-free electrocatalysts for oxygen evolution reaction (OER) of water splitting due to their high macro-conductivity and abundant surface active sites. However,...

Nanoboxes endow non-noble-metal-based electrocatalysts with high efficiency for overall water splitting

2021 ◽  
Author(s):  
Cheng Wang ◽  
Hongyuan Shang ◽  
Hui Xu ◽  
Yukou Du
Keyword(s):  
Water Splitting ◽  
Noble Metal ◽  
Active Sites ◽  
High Efficiency ◽  
Synergistic Effects ◽  
Electron Mass ◽  
Electronic Effects ◽  
Promising Candidate ◽  
Surface Active ◽  
Electrochemical Water Splitting

Non-noble-metal nanoboxes with abundant surface active sites, facilitated electron/mass transport, favorable synergistic effects and electronic effects, serving as promising candidate materials for boosting electrochemical water splitting.

scholarly journals Highly active deficient ternary sulfide photoanode for photoelectrochemical water splitting

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
Haimei Wang ◽  
Yuguo Xia ◽  
Haiping Li ◽  
Xiang Wang ◽  
Yuan Yu ◽  
...  
Keyword(s):  
Water Splitting ◽  
Photoelectrochemical Water Splitting ◽  
Highly Active ◽  
Ternary Sulfide

scholarly journals Ultradispersed IrxNi clusters as bifunctional electrocatalysts for high-efficiency water splitting in acid electrolytes

RSC Advances ◽  
2021 ◽  
Vol 11 (53) ◽  
pp. 33179-33185
Author(s):  
Xiaojie Zhao ◽  
Ying Chang ◽  
Jiang Ji ◽  
Jingchun Jia ◽  
Meilin Jia
Keyword(s):  
Water Splitting ◽  
Active Sites ◽  
High Efficiency ◽  
Bifunctional Electrocatalysts

A method of preparing IrxNi/C clusters by polyol reduction using a XC-72R support was proposed. Due to the 2 nm size of the catalyst particles, more active sites are exposed. This is a promising route for the development of efficient water splitting electrocatalysts.

scholarly journals Structural, morphological and catalytic characteristics of nanostructured palladium catalysts

2021 ◽  
Vol 2086 (1) ◽  
pp. 012203
Author(s):  
P D Pushankina ◽  
I S Lutsenko ◽  
I S Glazkova ◽  
T I Malkov ◽  
M A Mukhanov
Keyword(s):  
Palladium Catalysts ◽  
Active Sites ◽  
High Efficiency ◽  
Active Surface ◽  
Spherical Particles ◽  
Methanol Oxidation Reaction ◽  
Catalyst Synthesis ◽  
Long Term Stability ◽  
Highly Active

Abstract A new method for the highly active palladium catalyst synthesis on the surface of a Pd-23%Ag film has been developed to increase the material activity with respect to reactions involving hydrogen. Comparison of the electrochemical experiments data of classical palladium black and a new developed nanocatalyst demonstrated a significant increase in catalytic activity in the methanol oxidation reaction (up to 17.09 μA cm−2) for electrodes modified with the latter catalyst. The reason for that is an increase in the number of localized potentially more active surface regions due to the creation of a larger number of active sites in comparison with spherical particles. Estimation of resistance to CO poisoning showed high efficiency of nanocatalysts. Chronoamperometric experiment established the long-term stability and activity of the developed catalyst and confirmed the possibility of its practical use.

Understanding Energy Conversion and Loss Mechanisms in Ternary Metal Oxide Photoelectrodes: The Case of Copper Vanadate

2017 ◽  
Author(s):  
Chang-Ming Jiang ◽  
Gideon Segev ◽  
Lucas H. Hess ◽  
Guiji Liu ◽  
Gregory Zaborski ◽  
...  
Keyword(s):  
Metal Oxide ◽  
Surface States ◽  
Photocurrent Density ◽  
Absorption Length ◽  
Sputtering Deposition ◽  
Elemental Ratios ◽  
Onset Potential ◽  
Photocurrent Spectroscopy ◽  
Ternary Metal ◽  
Copper Vanadate

Essential photoelectrochemical (PEC) functionalities are systematically analyzed on a series of copper vanadate photoanodes with different Cu:V elemental ratios. Homogeneous, highly continuous, and phase-pure thin films of <i>β</i>-Cu<sub>2</sub>V<sub>2</sub>O<sub>7</sub>, <i>γ</i>-Cu<sub>3</sub>V<sub>2</sub>O<sub>8</sub>, Cu<sub>11</sub>V<sub>6</sub>O<sub>26</sub> and Cu<sub>5</sub>V<sub>2</sub>O<sub>10</sub> are grown via reactive co-sputtering deposition and then evaluated for their performances in light-driven oxygen evolution reaction (OER). Despite all four compounds have similar 1.8 – 2.0 eV bandgaps, Cu-rich phases are found to exhibit shorted absorption length in addition to higher charge separation efficiencies at the semiconductor/electrolyte junction. In the presence of sacrificial hole acceptor, the superior bulk properties of Cu<sub>5</sub>V<sub>2</sub>O<sub>10</sub> photoanode translate to the most cathodic (0.67 V vs. RHE) onset potential and a 206 μA/cm<sup>2</sup> photocurrent density that is four times higher than <i>β</i>-Cu<sub>2</sub>V<sub>2</sub>O<sub>7</sub> at 1.23 V. vs. RHE. Nevertheless, the sluggish OER kinetics competes with carrier recombination through Cu-associated surface states, and transient photocurrent spectroscopy quantitatively reveals the deterioration of surface catalytic activity with increasing Cu:V elemental ratio. This comprehensive analysis of PEC characteristics – light absorption, carrier separation, and heterogeneous charge transfer – not only gives insights into functional roles of individual elements in ternary metal oxide photoanodes, but also provides strategies for rational discovery, design, and engineering of new photoelectrode materials for solar fuel production.

Sign in / Sign up

Export Citation Format

Share Document