Enhanced Hydrogen Evolution under Simulated Sunlight from Neutral Electrolytes on (ZnSe)0.85(CuIn0.7Ga0.3Se2)0.15Photocathodes Prepared by a Bilayer Method

2016 ◽  
Vol 55 (49) ◽  
pp. 15329-15333 ◽  
Author(s):  
Hiroyuki Kaneko ◽  
Tsutomu Minegishi ◽  
Mamiko Nakabayashi ◽  
Naoya Shibata ◽  
Kazunari Domen
Keyword(s):  
Hydrogen Evolution ◽  
Simulated Sunlight

Photoelectrochemical Properties of Surface-Modified ZnSe:Cu(In,Ga)Se2 Photocathodes for Efficient and Durable Overall Water Splitting

2018 ◽  
Vol MA2018-01 (31) ◽  
pp. 1922-1922
Author(s):  
Hiroyuki Kaneko ◽  
Tsutomu Minegishi ◽  
Kazunari Domen
Keyword(s):  
Hydrogen Evolution ◽  
Water Splitting ◽  
Phosphate Buffer Solution ◽  
Potassium Phosphate ◽  
List Type ◽  
Simulated Sunlight ◽  
Current Time ◽  
Overall Water Splitting ◽  
Potassium Phosphate Buffer Solution ◽  
Surface Modified

Overall water splitting using a photoelectrochemical (PEC) cell composed of a photocathode and photoanode connected in a series is an attractive method to produce hydrogen from water under sunlight. Because driving forces of two photoelectrodes are combined for the water splitting reaction, narrow-gap materials can be used to achieve high solar-to-hydrogen conversion efficiency (STH). However, the STHs obtained from a PEC cell without any external bias voltage reported so far have been less than 1%. This is because of insufficient onset potentials and photocurrent values of photoelectrodes. For the sake of overcoming the drawbacks, (ZnSe)0.85(CuIn0.7Ga0.3Se2)0.15 ((ZnSe)0.85(CIGS)0.15) thin film photocathodes have recently been developed and reported to show a high onset potential of 0.89 VRHE and long absorption edge of 850-900 nm.2 These properties are suitable for use in the PEC cell. (ZnSe)0.85(CIGS)0.15 thin films are prepared by co-evaporation onto Mo-coated soda-lime glass substrates. Subsequently, CdS, a binary of Mo/Ti and Pt are deposited onto the photocathode surface as a buffer layer, surface conductor and hydrogen evolution reaction (HER) catalyst, respectively.3 The surface-modified (ZnSe)0.85(CIGS)0.15 photocathodes show a relatively high photocurrent value of 12 mA cm-2 at 0 VRHE and sufficient stability in a span of hours at potentials of more negative than 0.5 VRHE under simulated sunlight in a neutral potassium phosphate buffer solution.4 However, at potentials more positive than 0.5 VRHE, the photocurrent value attributed to HER dramatically decreases by half in just one hour mainly due to self-oxidation of the surface sulfide layer, accompanying detachment of the Mo/Ti and Pt at the surface. The poor stability at the positive potentials has made it difficult to construct durable PEC cell using the photocathodes. In this work, effects of surface modifications onto PEC properties of (ZnSe)0.85(CIGS)0.15 photocathodes are investigated. For the sake of suppressing the surface corrosion, the CdS layer was passivated with In2S3, which was formed by using chemical bath deposition (CBD).5 Figure 1 shows the current-time curves of the surface-modified (ZnSe)0.85(CIGS)0.15 photocathodes at 0.6 VRHE under simulated sunlight. Without the CBD treatment, the photocurrent value decreased by 50% in one hour under light irradiation. On the other hand, the In2S3-modified photocathode showed relatively stable PEC HER and the decline of the photocurrent value in one hour was decreased to 25%. It is highly possible that the improvement of stability originates from low solubility of indium oxide or hydroxide generated by the self-oxidation process, while the cadmium oxide and hydroxide are relatively soluble, which can cause corrosion of the surface. Furthermore, effects of oxide-coating onto the stability of the (ZnSe)0.85(CIGS)0.15 photocathode during PEC hydrogen evolution have also been investigated. Among various kinds of coating processes, direct formation of the oxide layer by photoelectrodeposition without annealing the photocathode is an effective method without exerting a bad influence on the underlying sulfide and selenide materials. In the presentation, the details of preparation conditions and PEC properties will be discussed. References J. W. Ager, M. R. Shaner, K. A. Walczak, I. D. Sharp and S. Ardo, Energy Environ. Sci. 2015, 8, 2811–2824. H. Kaneko, T. Minegishi, M. Nakabayashi, N. Shibata, Y. Kuang, T. Yamada and K. Domen, Adv. Funct. Mater. 2016, 26, 4570–4577. H. Kumagai, T. Minegishi, N. Sato, T. Yamada, J. Kubota and K. Domen, J. Mater. Chem. A 2015, 3, 8300–8307. H. Kaneko, T. Minegishi, M. Nakabayashi, N. Shibata and K. Domen, Angew. Chemie Int. Ed. 2016, 55, 15329–15333. F. Jiang, Gunawan, T. Harada, Y. Kuang, T. Minegishi, K. Domen and S. Ikeda, J. Am. Chem. Soc. 2015, 137, 13691–13697. Figure 1

scholarly journals Durable hydrogen evolution from water driven by sunlight using (Ag,Cu)GaSe2 photocathodes modified with CdS and CuGa3Se5

2015 ◽  
Vol 6 (2) ◽  
pp. 894-901 ◽  
Author(s):  
Li Zhang ◽  
Tsutomu Minegishi ◽  
Mamiko Nakabayashi ◽  
Yohichi Suzuki ◽  
Kazuhiko Seki ◽  
...  
Keyword(s):  
Hydrogen Evolution ◽  
Multilayer Structure ◽  
Simulated Sunlight

The multilayer structure enhances the hydrogen evolution from water under simulated sunlight.

Ultrathin HNbWO6 nanosheets: facile synthesis and enhanced hydrogen evolution performance from photocatalytic water splitting

2015 ◽  
Vol 51 (82) ◽  
pp. 15125-15128 ◽  
Author(s):  
Yuhao Liu ◽  
Jinhua Xiong ◽  
Shuiguang Luo ◽  
Ruowen Liang ◽  
Na Qin ◽  
...  
Keyword(s):  
Hydrogen Evolution ◽  
Water Splitting ◽  
Simulated Sunlight ◽  
Facile Synthesis ◽  
Sunlight Irradiation ◽  
Photocatalytic Water Splitting ◽  
Highly Dispersed

Ultrathin monolayer HNbWO6 nanosheets were rapidly synthesised with triethanolamine as a stripping agent in just a few minutes. These obtained highly dispersed nanosheets suspensions exhibit an efficient photocatalytic H2 evolution performance under simulated sunlight irradiation.

Development of highly efficient CuIn0.5Ga0.5Se2-based photocathode and application to overall solar driven water splitting

2018 ◽  
Vol 11 (10) ◽  
pp. 3003-3009 ◽  
Author(s):  
Hiroyuki Kobayashi ◽  
Naotoshi Sato ◽  
Masahiro Orita ◽  
Yongbo Kuang ◽  
Hiroyuki Kaneko ◽  
...  
Keyword(s):  
Hydrogen Evolution ◽  
Water Splitting ◽  
Simulated Sunlight ◽  
Highly Efficient ◽  
Surface Modified

Optimization of CBM offset boosted hydrogen evolution from water on CuIn1−xGaxSe2 (CIGS) photocathode surface modified with Pt and CdS under simulated sunlight.

Efficient hydrogen evolution from water using CdTe photocathodes under simulated sunlight

2017 ◽  
Vol 5 (25) ◽  
pp. 13154-13160 ◽  
Author(s):  
Jin Su ◽  
Tsutomu Minegishi ◽  
Kazunari Domen
Keyword(s):  
Hydrogen Evolution ◽  
Conversion Efficiency ◽  
Simulated Sunlight ◽  
Applied Potential ◽  
Incident Photon

CdTe-based photocathodes have shown an extremely high incident photon-to-current conversion efficiency (IPCEs) of >95% at 560–660 nm with an applied potential of 0 VRHE.

Rational design of benzodifuran-functionalized donor-acceptor covalent organic framework for photocatalytic hydrogen evolution from water

2021 ◽  
Author(s):  
Yu-Bin Dong ◽  
Guangbo Wang ◽  
Fu-Cheng Zhu ◽  
Qian-Qian Lin ◽  
Jing-Lan Kan ◽  
...  
Keyword(s):  
Hydrogen Evolution ◽  
Rational Design ◽  
Evolution Rate ◽  
Simulated Sunlight ◽  
Photocatalytic Hydrogen Evolution ◽  
Covalent Organic Framework ◽  
Hydrogen Evolution Rate ◽  
Donor Acceptor ◽  
Organic Framework

A benzodifuran-based donor-acceptor covalent organic framework was synthesized and employed for efficient simulated sunlight-driven photocatalytic hydrogen evolution from water, which exhibited superior and steady hydrogen evolution rate of 1390 μmol...

Enhanced photocatalytic hydrogen evolution over a heterojunction composed of silver cyanamide and graphitic carbon nitride

2018 ◽  
Vol 42 (19) ◽  
pp. 16005-16012 ◽  
Author(s):  
Chunpeng Bai ◽  
Jingce Bi ◽  
Junbiao Wu ◽  
Yide Han ◽  
Xia Zhang
Keyword(s):  
Photocatalytic Activity ◽  
Hydrogen Evolution ◽  
Carbon Nitride ◽  
Graphitic Carbon ◽  
Graphitic Carbon Nitride ◽  
Simulated Sunlight ◽  
Sunlight Irradiation ◽  
Photocatalytic Hydrogen Evolution ◽  
Excellent Photocatalytic Activity

A semiconductor heterojunction composed of silver cyanamide (Ag2NCN) and graphitic carbon nitride (g-C3N4) exhibited excellent photocatalytic activity for hydrogen evolution under simulated sunlight irradiation.

Efficient hydrogen evolution on (CuInS2)x(ZnS)1−x solid solution-based photocathodes under simulated sunlight

2019 ◽  
Vol 55 (4) ◽  
pp. 470-473 ◽  
Author(s):  
Jiao Zhao ◽  
Tsutomu Minegishi ◽  
Hiroyuki Kaneko ◽  
Guijun Ma ◽  
Miao Zhong ◽  
...  
Keyword(s):  
Thin Film ◽  
Solid Solution ◽  
Hydrogen Evolution ◽  
Water Splitting ◽  
Simulated Sunlight ◽  
Solar Water ◽  
Solar Water Splitting ◽  
First Time

A thin film of (CuInS2)x(ZnS)1−x has been developed as a photocathode for solar water splitting for the first time.

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