scholarly journals High-performance and stable photoelectrochemical water splitting cell with organic-photoactive-layer-based photoanode

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
Je Min Yu ◽  
Jungho Lee ◽  
Yoon Seo Kim ◽  
Jaejung Song ◽  
Jiyeon Oh ◽  
...  
Keyword(s):  
Water Splitting ◽  
Organic Semiconductors ◽  
High Performance ◽  
Energy Levels ◽  
Photocurrent Density ◽  
Hydrogen Electrode ◽  
Photoactive Layer ◽  
Onset Potential ◽  
The Stability ◽  
Double Hydroxides

Abstract Considering their superior charge-transfer characteristics, easy tenability of energy levels, and low production cost, organic semiconductors are ideal for photoelectrochemical (PEC) hydrogen production. However, organic-semiconductor-based photoelectrodes have not been extensively explored for PEC water-splitting because of their low stability in water. Herein, we report high-performance and stable organic-semiconductors photoanodes consisting of p-type polymers and n-type non-fullerene materials, which is passivated using nickel foils, GaIn eutectic, and layered double hydroxides as model materials. We achieve a photocurrent density of 15.1 mA cm−2 at 1.23 V vs. reversible hydrogen electrode (RHE) with an onset potential of 0.55 V vs. RHE and a record high half-cell solar-to-hydrogen conversion efficiency of 4.33% under AM 1.5 G solar simulated light. After conducting the stability test at 1.3 V vs. RHE for 10 h, 90% of the initial photocurrent density are retained, whereas the photoactive layer without passivation lost its activity within a few minutes.

scholarly journals Room Temperature Surface Modification of Ultrathin FeOOH Cocatalysts on Fe2O3 Photoanodes for High Photoelectrochemical Water Splitting

2020 ◽  
Vol 2020 ◽  
pp. 1-7 ◽  
Author(s):  
Yiqing Wei ◽  
Aizhen Liao ◽  
Lu Wang ◽  
Xiaoyong Wang ◽  
Dunhui Wang ◽  
...  
Keyword(s):  
Water Splitting ◽  
Room Temperature ◽  
Photocurrent Density ◽  
Reversible Hydrogen Electrode ◽  
Interfacial Resistance ◽  
Hydrogen Electrode ◽  
Onset Potential ◽  
Temperature Surface ◽  
Excellent Stability ◽  
Pec Water Splitting

An ultrathin FeOOH cocatalyst is deposited on α-Fe2O3 photoanodes in a simple room temperature immersion process for efficient photoelectrochemical (PEC) water splitting. The prepared FeOOH/Fe2O3 photoanode has a photocurrent density of up to 2.4 mA/cm2 at 1.23 V versus reversible hydrogen electrode (RHE), and the photocurrent density is increased by about 160% compared to the bare Fe2O3 of 1.55 mA/cm2. An obvious cathodic shift of the photocurrent onset potential from 0.661 to 0.582 V was also observed, and excellent stability was maintained with almost no deterioration for 5 h. The enhanced PEC performance is attributed to the decrease of the interfacial resistance between electrode and electrolyte and the increase of the injection efficiency of holes in Fe2O3.

scholarly journals Two-Dimensional Mn-Co LDH/Graphene Composite towards High-Performance Water Splitting

Catalysts ◽  
2018 ◽  
Vol 8 (9) ◽  
pp. 350 ◽  
Author(s):  
Jian Bao ◽  
Junfeng Xie ◽  
Fengcai Lei ◽  
Zhaolong Wang ◽  
Wenjun Liu ◽  
...  
Keyword(s):  
Water Splitting ◽  
High Performance ◽  
High Current Density ◽  
High Current ◽  
Hydrogen Electrode ◽  
Promising Candidate ◽  
New Material ◽  
Ultrathin Nanosheet ◽  
Double Hydroxides ◽  
First Time

The oxygen evolution reaction (OER) is a complex multi-step four-electron process showing sluggish kinetics. Layered double hydroxides (LDH) were reported as promising catalysts for the OER, but their low electrical conductivity restricts their widespread applications. To overcome this problem, a composite material containing Mn-Co LDH ultrathin nanosheet and highly conductive graphene was synthesized for the first time. Benefited from the high electrocatalytic activity and the superior charge transfer ability induced by these components, the new material shows superior OER activity. Used as the OER catalyst, a high current density of 461 mA cm−2 at 2.0 V vs. RHE (reversible hydrogen electrode) was measured besides shows a low overpotential of 0.33 V at 10 mA cm−2. Moreover, the new composite also shows a superior bifunctional water splitting performance as catalyst for the OER and HER (hydrogen evolution reaction) catalysts. Our results indicate that the presented material is a promising candidate for water splitting which is cheap and efficient.

High-Performance n-type Organic Semiconductors: Incorporating Specific Electron-Withdrawing Motifs to Achieve Tight Molecular Stacking and Optimized Energy Levels

2012 ◽  
Vol 24 (7) ◽  
pp. 911-915 ◽  
Author(s):  
Sun Woo Yun ◽  
Jong H. Kim ◽  
Seunghoon Shin ◽  
Hoichang Yang ◽  
Byeong-Kwan An ◽  
...  
Keyword(s):  
Organic Semiconductors ◽  
High Performance ◽  
Energy Levels ◽  
Molecular Stacking

Co–Mo–Se ternary chalcogenide thin film coated p-Si photocathode for efficient solar hydrogen production

2020 ◽  
pp. 2151002
Author(s):  
Cihan Kuru
Keyword(s):  
Thin Film ◽  
Hydrogen Production ◽  
Photocurrent Density ◽  
Superior Performance ◽  
Great Promise ◽  
High Catalytic Activity ◽  
Hydrogen Electrode ◽  
Onset Potential ◽  
Ternary Chalcogenide ◽  
Chalcogenide Thin Film

Photoelectrochemical (PEC) water splitting holds a great promise for clean and sustainable hydrogen production. In this study, the PEC performance of Co–Mo–Se ternary chalcogenide thin film coated Si photocathodes is investigated. The Co–Mo–Se films with various Co/Mo atomic ratios were prepared by thermal selenization of sputter deposited Co–Mo alloy films. Among the photocathodes, the Co–Mo–Se (3:10)/[Formula: see text]-Si surpasses the PEC performance of the MoSe2/[Formula: see text]-Si with an onset potential of +124 mV vs. reversible hydrogen electrode (RHE), a photocurrent density of −22.68 mA/cm2 at zero overpotential and good stability over 6 h period of test. The superior performance of the Co–Mo–Se (3:10)/[Formula: see text]-Si is ascribed to the high catalytic activity of the film in hydrogen evolution reaction (HER) and efficient collection of photogenerated charge carriers. Such ternary chalcogenide thin films offer exciting opportunities for many applications in which the physicochemical properties can be tuned by changing the relative amount of the solute atoms.

Identifying dual functions of rGO in a BiVO4/rGO/NiFe-layered double hydroxide photoanode for efficient photoelectrochemical water splitting

2020 ◽  
Vol 8 (26) ◽  
pp. 13231-13240 ◽  
Author(s):  
Hua Chen ◽  
Songcan Wang ◽  
Jianzhong Wu ◽  
Xiacong Zhang ◽  
Jia Zhang ◽  
...  
Keyword(s):  
Reaction Kinetics ◽  
Water Splitting ◽  
Layered Double Hydroxides ◽  
Oxygen Evolution Reaction ◽  
Surface Reaction ◽  
Photocurrent Density ◽  
Surface Reaction Kinetics ◽  
Double Hydroxide ◽  
Double Hydroxides ◽  
Dual Functions

To enhance surface reaction kinetics for oxygen evolution reaction, nanoporous BiVO4 photoanodes are modified by rGO and NiFe-layered double hydroxides, leading to an enhanced photocurrent density of 3.26 mA cm−2 under AM 1.5 G illumination.

Large area high-performance bismuth vanadate photoanode for efficient solar water splitting

2020 ◽  
Vol 8 (7) ◽  
pp. 3845-3850 ◽  
Author(s):  
Meirong Huang ◽  
Wenhai Lei ◽  
Min Wang ◽  
Shuji Zhao ◽  
Changli Li ◽  
...  
Keyword(s):  
Water Splitting ◽  
Water Oxidation ◽  
High Performance ◽  
Large Scale ◽  
Photocurrent Density ◽  
Large Area ◽  
Solar Water ◽  
Solar Water Splitting ◽  
Harsh Conditions ◽  
Density Of Water

Large-scale BiVO4 photoanodes were prepared for solar water splitting. A photocurrent density of water oxidation of ∼2.23 mA cm−2 at 1.23 VRHE and ∼0.83% conversion efficiency at 0.65 VRHE were achieved, with <4% decay after 5 h of operation under harsh conditions.

scholarly journals Direct growth of uniform carbon nitride layers with extended optical absorption towards efficient water-splitting photoanodes

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
Jiani Qin ◽  
Jesús Barrio ◽  
Guiming Peng ◽  
Jonathan Tzadikov ◽  
Liel Abisdris ◽  
...  
Keyword(s):  
Optical Absorption ◽  
Water Splitting ◽  
Carbon Nitride ◽  
Photophysical Properties ◽  
Photocurrent Density ◽  
Nitride Layer ◽  
Universal Method ◽  
Intimate Contact ◽  
Faradaic Efficiency ◽  
Onset Potential

Abstract A general synthesis of carbon nitride (CN) films with extended optical absorption, excellent charge separation under illumination, and outstanding performance as a photoanode in water-splitting photoelectrochemical cells is reported. To this end, we introduced a universal method to rapidly grow CN monomers directly from a hot saturated solution on various substrates. Upon calcination, a highly uniform carbon nitride layer with tuned structural and photophysical properties and in intimate contact with the substrate is obtained. Detailed photoelectrochemical and structural studies reveal good photoresponse up to 600 nm, excellent hole extraction efficiency (up to 62%) and strong adhesion of the CN layer to the substrate. The best CN photoanode demonstrates a benchmark-setting photocurrent density of 353 µA cm−2 (51% faradaic efficiency for oxygen), and external quantum yield value above 12% at 450 nm at 1.23 V versus RHE in an alkaline solution, as well as low onset potential and good stability.

Fabricating highly efficient heterostructured CuBi2O4 photocathodes for unbiased water splitting

2020 ◽  
Vol 8 (5) ◽  
pp. 2498-2504 ◽  
Author(s):  
Sabiha Akter Monny ◽  
Lei Zhang ◽  
Zhiliang Wang ◽  
Bin Luo ◽  
Muxina Konarova ◽  
...  
Keyword(s):  
Water Splitting ◽  
Photocurrent Density ◽  
Onset Potential ◽  
Highly Efficient ◽  
Splitting System

Efficient CuBi2O4 based photocathode with large onset potential (1.1 VSHE) and high photocurrent density (1.87 mA cm−2 at 0.6 VSHE) has been fabricated for constructing the unbiased water splitting system with the suitable photoanode.

scholarly journals Nitrogen and Cobalt Co-Coped Carbon Materials Derived from Biomass Chitin as High-Performance Electrocatalyst for Aluminum-Air Batteries

Catalysts ◽  
2019 ◽  
Vol 9 (11) ◽  
pp. 954 ◽  
Author(s):  
Mi Wang ◽  
Jian Ma ◽  
Haoqi Yang ◽  
Guolong Lu ◽  
Shuchen Yang ◽  
...  
Keyword(s):  
Carbon Material ◽  
High Performance ◽  
Low Cost ◽  
Reduction Reaction ◽  
Discharge Voltage ◽  
Limiting Current ◽  
Alkaline Electrolyte ◽  
Hydrogen Electrode ◽  
Onset Potential ◽  
Practical Applications

Development of convenient, economic electrocatalysts for oxygen reduction reaction (ORR) in alkaline medium is of great significance to practical applications of aluminum-air batteries. Herein, a biomass chitin-derived carbon material with high ORR activities has been prepared and applied as electrocatalysts in Al-air batteries. The obtained cobalt, nitrogen co-doped carbon material (CoNC) exhibits the positive onset potential 0.86 V vs. RHE (reversible hydrogen electrode) and high-limiting current density 5.94 mA cm−2. Additionally, the durability of the CoNC material in alkaline electrolyte shows better stability when compared to the commercial Pt/C catalyst. Furthermore, the Al-air battery using CoNC as an air cathode catalyst provides the power density of 32.24 mW cm−2 and remains the constant discharge voltage of 1.17 V at 20 mA cm−2. This work not only provides a facile method to synthesize low-cost and efficient ORR electrocatalysts for Al-air batteries, but also paves a new way to explore and utilize high-valued biomass materials.

Sign in / Sign up

Export Citation Format

Share Document