HYDROGEN EVOLUTION ON SURFACE-MODIFIED SILICON POWDER PHOTOCATALYSTS IN AQUEOUS ETHANOL SOLUTIONS

1983 ◽  
Vol 12 (3) ◽  
pp. 269-272 ◽  
Author(s):  
Yoshikuni Taniguchi ◽  
Hiroshi Yoneyama ◽  
Hideo Tamura
Keyword(s):  
Hydrogen Evolution ◽  
Aqueous Ethanol ◽  
Silicon Powder ◽  
Surface Modified

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

Enhanced catalytic activity of edge-exposed 1T phase WS2 grown directly on a WO3 nanohelical array for water splitting

2019 ◽  
Vol 7 (46) ◽  
pp. 26378-26384 ◽  
Author(s):  
Noho Lee ◽  
Il Yong Choi ◽  
Kyung-Yeon Doh ◽  
Jaewon Kim ◽  
Hyeji Sim ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Hydrogen Evolution ◽  
Water Splitting ◽  
Hydrogen Evolution Reaction ◽  
Catalytic Performance ◽  
Surface Modified

A hierarchical electrode consisting of edge-exposed 1T phase WS2, grown on an array of surface-modified WO3 nanohelixes (NHs), and its enhanced catalytic performance in the hydrogen evolution reaction (HER) are presented.

MOF-templated in situ fabrication of surface-modified Ni/graphitic carbon nitride with enhanced photocatalytic hydrogen evolution

2019 ◽  
Vol 9 (14) ◽  
pp. 3828-3835 ◽  
Author(s):  
Mengli Li ◽  
Shuang Song ◽  
Changsheng Su ◽  
Lei Li ◽  
Zheng Yan ◽  
...  
Keyword(s):  
Hydrogen Evolution ◽  
Carbon Nitride ◽  
Graphitic Carbon Nitride ◽  
High Dispersion ◽  
Photocatalytic Hydrogen Evolution ◽  
In Situ Fabrication ◽  
Ni Species ◽  
Calcination Method ◽  
Surface Modified

Surface-modified Ni species derived from 2D Ni-MOFs were loaded on g-C3N4 with high dispersion by the in situ calcination method.

Photoredox dual reaction for selective alcohol oxidation and hydrogen evolution over nickel surface-modified ZnIn2S4

2020 ◽  
Vol 271 ◽  
pp. 118946 ◽  
Author(s):  
Qiong Lin ◽  
Yue-Hua Li ◽  
Ming-Yu Qi ◽  
Jing-Yu Li ◽  
Zi-Rong Tang ◽  
...  
Keyword(s):  
Hydrogen Evolution ◽  
Alcohol Oxidation ◽  
Nickel Surface ◽  
Surface Modified

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.

scholarly journals SUPPRESSING HYDROGEN EVOLUTION BY AQUEOUS SILICON POWDER DISPERSIONS THROUGH THE INTRODUCTION OF AN ADDITIONAL CATHODIC REACTION

2013 ◽  
Vol 201 (4) ◽  
pp. 501-515 ◽  
Author(s):  
S. M. Tichapondwa ◽  
W. W. Focke ◽  
O. Del Fabbro ◽  
R. W. Sandenbergh ◽  
E. Muller
Keyword(s):  
Hydrogen Evolution ◽  
Silicon Powder ◽  
Cathodic Reaction ◽  
Aqueous Silicon
Sign in / Sign up

Export Citation Format

Share Document