skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Developing new understanding of photoelectrochemical water splitting via in-situ techniques: A review on recent progress

ORCiD logo; ; ;
Publication Date:
Sponsoring Org.:
OSTI Identifier:
Grant/Contract Number:
Resource Type:
Journal Article: Published Article
Journal Name:
Green Energy & Environment
Additional Journal Information:
Journal Volume: 2; Journal Issue: 2; Related Information: CHORUS Timestamp: 2017-05-05 11:32:05; Journal ID: ISSN 2468-0257
Country of Publication:

Citation Formats

Cen, Jiajie, Wu, Qiyuan, Liu, Mingzhao, and Orlov, Alexander. Developing new understanding of photoelectrochemical water splitting via in-situ techniques: A review on recent progress. China: N. p., 2017. Web. doi:10.1016/j.gee.2017.03.001.
Cen, Jiajie, Wu, Qiyuan, Liu, Mingzhao, & Orlov, Alexander. Developing new understanding of photoelectrochemical water splitting via in-situ techniques: A review on recent progress. China. doi:10.1016/j.gee.2017.03.001.
Cen, Jiajie, Wu, Qiyuan, Liu, Mingzhao, and Orlov, Alexander. Sat . "Developing new understanding of photoelectrochemical water splitting via in-situ techniques: A review on recent progress". China. doi:10.1016/j.gee.2017.03.001.
title = {Developing new understanding of photoelectrochemical water splitting via in-situ techniques: A review on recent progress},
author = {Cen, Jiajie and Wu, Qiyuan and Liu, Mingzhao and Orlov, Alexander},
abstractNote = {},
doi = {10.1016/j.gee.2017.03.001},
journal = {Green Energy & Environment},
number = 2,
volume = 2,
place = {China},
year = {Sat Apr 01 00:00:00 EDT 2017},
month = {Sat Apr 01 00:00:00 EDT 2017}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1016/j.gee.2017.03.001

Save / Share:
  • Study on hydrogen generation has been of huge interest due to increasing demand for new energy sources. Photoelectrochemical reaction by catalysts was proposed as a promising technique for hydrogen generation. Herein, we report the hydrogen generation via photoelectrochecmial reaction using films of exfoliated 2-dimensional (2D) MoS{sub 2}, which acts as an efficient photocatalyst. The film of chemically exfoliated MoS{sub 2} layers was employed for water splitting, leading to hydrogen generation. The amount of hydrogen was qualitatively monitored by observing overpressure of a water container. The high photo-current generated by MoS{sub 2} film resulted in hydrogen evolution. Our work shows thatmore » 2D MoS{sub 2} is one of the promising candidates as a photocatalyst for light-induced hydrogen generation. High photoelectrocatalytic efficiency of the 2D MoS{sub 2} shows a new way toward hydrogen generation, which is one of the renewable energy sources. The efficient photoelectrocatalytic property of the 2D MoS{sub 2} is possibly due to availability of catalytically active edge sites together with minimal stacking that favors the electron transfer.« less
  • Here, photocatalytic water splitting using sunlight is a promising technology capable of providing high energy yield without pollutant byproducts. Herein, we review various aspects of this technology including chemical reactions, physiochemical conditions and photocatalyst types such as metal oxides, sulfides, nitrides, nanocomposites, and doped materials followed by recent advances in computational modeling of photoactive materials. As the best-known catalyst for photocatalytic hydrogen and oxygen evolution, TiO 2 is discussed in a separate section, along with its challenges such as the wide band gap, large overpotential for hydrogen evolution, and rapid recombination of produced electron-hole pairs. Various approaches are addressed tomore » overcome these shortcomings, such as doping with different elements, heterojunction catalysts, noble metal deposition, and surface modification. Development of a photocatalytic corrosion resistant, visible light absorbing, defect-tuned material with small particle size is the key to complete the sunlight to hydrogen cycle efficiently. Computational studies have opened new avenues to understand and predict the electronic density of states and band structure of advanced materials and could pave the way for the rational design of efficient photocatalysts for water splitting. Future directions are focused on developing innovative junction architectures, novel synthesis methods and optimizing the existing active materials to enhance charge transfer, visible light absorption, reducing the gas evolution overpotential and maintaining chemical and physical stability« less
  • Here, magnetic reconnection is a fundamental process at work in laboratory, space, and astrophysical plasmas, in which magnetic field lines change their topology and convert magnetic energy to plasma particles by acceleration and heating. One of the most important problems in reconnection research has been to understand why reconnection occurs so much faster than predicted by magnetohydrodynamics theory. Following the recent pedagogical review of this subject [Yamada et al., Rev. Mod. Phys. 82, 603 (2010)], this paper presents a review of more recent discoveries and findings in the research of fast magnetic reconnection in laboratory, space, and astrophysical plasmas. Inmore » spite of the huge difference in physical scales, we find remarkable commonality between the characteristics of the magnetic reconnection in laboratory and space plasmas. In this paper, we will focus especially on the energy flow, a key feature of the reconnection process. In particular, the experimental results on the energy conversion and partitioning in a laboratory reconnection layer [Yamada et al., Nat. Commun. 5, 4474 (2014)] are discussed and compared with quantitative estimates based on two-fluid analysis. In the Magnetic ReconnectionExperiment, we find that energy deposition to electrons is localized near the X-point and is mostly from the electric field component perpendicular to the magnetic field. The mechanisms of ion acceleration and heating are also identified, and a systematic and quantitative study on the inventory of converted energy within a reconnection layer with a well-defined but variable boundary. The measured energy partition in a reconnection region of similar effective size (L ≈ 3 ion skin depths) of the Earth's magneto-tail [Eastwood et al., Phys. Rev. Lett. 110, 225001 (2013)] is notably consistent with our laboratory results. Finally, to study the global aspects of magnetic reconnection, we have carried out a laboratory experiment on the stability criteria for solar flare eruptions, including “storage and release” mechanisms of magnetic energy. We show that toroidalmagnetic flux generated by magnetic relaxation (reconnection) processes generates a new stabilizing force which prevents plasma eruption. This result has led us to discover a new stabilizing force for solar flares [Myers et al., Nature 528, 526 (2015)].« less
  • With an eye toward developing a photoelectrochemical system for water splitting using p-GaInP{sub 2}, the electrochemical stability of p-GaInP{sub 2} was studied in 10 M KOH, 3 M H{sub 2}SO{sub 4}, and a phosphate buffer of pH 7. It was found that in the dark, the p-GaInP{sub 2} electrode is susceptible to corrosion in all investigated solutions. Upon illumination, the anodic corrosion current increases. Under cathodic polarization in 10 M KOH, the p-GaInP{sub 2} electrode shows saturated photocurrent density, however the photocurrent slowly decreases with time due to the precipitation of an indium-enriched oxide. In 3 M H{sub 2}SO{sub 4},more » the anodic process can be inhibited under relatively low cathodic potentials, and stable photocurrents can be obtained. In neutral solution, p-GaInP{sub 2} is covered by a semi-insulating oxide film and the observed photocurrent densities are much lower than those in 10 M KOH and 3 M H{sub 2}SO{sub 4}.« less