ORCID Profile
0000-0003-0836-3239
Current Organisation
City University of Hong Kong
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Publisher: American Chemical Society (ACS)
Date: 03-09-2021
Publisher: Elsevier BV
Date: 08-2018
Publisher: Elsevier BV
Date: 06-2021
Publisher: Wiley
Date: 07-04-2023
Abstract: Selective photoelectrochemical (PEC) water oxidation to hydrogen peroxide is an underexplored option as opposed to the mainstream oxygen reduction reaction. Albeit interesting, selective H 2 O 2 production via oxidative pathway is plagued by the noncontrollable two‐electron transfer reaction and the overoxidation of the thus‐formed H 2 O 2 to O 2 . Here, ZnO passivator‐coated BiVO 4 photoanode is reported for selective PEC H 2 O 2 production. Both the H 2 O 2 selectivity and production rate increase in the range of 1.0–2.0 V versus RHE under simulated sunlight irradiation. The photoelectrochemical impedance spectra and open‐circuit potentials suggest a flattened band bending and positively shifted quasi‐Fermi level of BiVO 4 upon ZnO coating, facilitating H 2 O 2 generation and suppressing the competitive reaction of O 2 evolution. The ZnO overlayer also inhibits H 2 O 2 decomposition, accelerates charge extraction from BiVO 4 , and serves as a hole reservoir under photoexcitation. This work offers insights into surface states and the role of the coating layer in manipulating two/four‐electron transfer for selective H 2 O 2 synthesis from PEC water oxidation.
Publisher: Wiley
Date: 11-09-2018
Abstract: Cuprous Oxide (Cu
Publisher: Elsevier BV
Date: 12-2018
Publisher: Wiley
Date: 10-11-2020
Abstract: Photothermocatalytic ethanol oxidation to acetaldehyde offers an alternative technology in synthesizing high‐value‐added chemicals. However, the practical application is hindered by the competition from overoxidation leading to complete mineralization. Herein, the 1D nanostructured ZnO@zeolitic imidazolate framework‐8 (ZIF‐8) composite is reported as an efficient photothermocatalyst, which shows improved conversion efficiency and high catalytic selectivity and durability compared with the parent ZnO nanorods, for continuous ethanol oxidation in a flow system. The ZnO@ZIF‐8 composite achieves a high selectivity of 91.5% toward acetaldehyde production. The underlying mechanism is probed using electrochemical impedance spectroscopy, N 2 adsorption–desorption isotherms, transient open‐circuit potential, and steady‐state and time‐resolved photoluminescence spectroscopy. Collectively, the probings show that the improved performance originates from 1) facilitated charge separation 2) lowered oxidation potential holes 3) enlarged surface area and 4) preferred reaction routes. This work provides a new perspective for the design of a hybrid photothermocatalyst for selective solar energy conversion into desirable chemicals.
Publisher: American Chemical Society (ACS)
Date: 11-07-2022
Publisher: American Chemical Society (ACS)
Date: 13-11-2015
Publisher: Elsevier BV
Date: 06-2022
Publisher: Royal Society of Chemistry (RSC)
Date: 2020
DOI: 10.1039/D0SC01397H
Abstract: The isocyanate groups (–NCO) derived from –NC– bonds in the organic ligands enables the thermally treated ZIF-8 to act as wide-spectrum photocatalyst.
Publisher: American Chemical Society (ACS)
Date: 13-04-2018
Publisher: Elsevier BV
Date: 09-2019
Publisher: Royal Society of Chemistry (RSC)
Date: 2021
DOI: 10.1039/D0SE01901A
Abstract: A facile chemical treatment employing a reducing agent sodium sulfite with a mild reduction activity is used to alter the surface states of BiVO 4 photoanodes. The sulfite-treated BiVO 4 (S-BiVO 4 ) exhibits an enhanced photoelectrochemical performance.
Publisher: Wiley
Date: 09-12-2020
Abstract: Photocatalytic and photoelectrochemical processes are two key systems in harvesting sunlight for energy and environmental applications. As both systems are employing photoactive semiconductors as the major active component, strategies have been formulated to improve the properties of the semiconductors for better performances. However, requirements to yield excellent performances are different in these two distinctive systems. Although there are universal strategies applicable to improve the performance of photoactive semiconductors, similarities and differences exist when the semiconductors are to be used differently. Here, considerations on selected typical factors governing the performances in photocatalytic and photoelectrochemical systems, even though the same type of semiconductor is used, are provided. Understanding of the underlying mechanisms in relation to their photoactivities is of fundamental importance for rational design of high-performing photoactive materials, which may serve as a general guideline for the fabrication of good photocatalysts or photoelectrodes toward sustainable solar fuel generation.
Publisher: Elsevier BV
Date: 11-2020
Publisher: Royal Society of Chemistry (RSC)
Date: 2020
DOI: 10.1039/D0TA00629G
Abstract: An ultrathin amorphous ZnO layer is introduced on Cu 2 O by pulsed electrodeposition, which helps stabilise the Cu 2 O photocathode for water splitting.
Publisher: Wiley
Date: 15-10-2021
Abstract: Ammonia (NH 3 ) plays a vital role in the fertilizer industry, nitrogen‐containing chemical production, and hydrogen storage. The development of electrocatalytic and photo(electro)catalytic nitrogen reduction reaction (NRR) to synthesize NH 3 are desirable, which are more environmentally friendly than the conventional Haber–Bosch process. Due to the strong nonpolar bonding of the NN bond, the discovery of efficient catalysts is essential to overcome the high kinetic barrier. Here, bismuth‐based materials that show proven activities for NRR are highlighted. The fundamental knowledge, including thermodynamics, mechanisms, reaction systems, evaluation aspects of NRR, and product quantification, is introduced. Together with scientific reasoning and exhibited activities, the strategies for improving the performance are discussed in detail. Perspective and outlook, as well as the opportunities to further develop bismuth‐based materials for NH 3 synthesis, are provided. This review aims to provide a comprehensive understanding of the advancement in this field and serves as a guide for the future design of highly efficient NRR catalysts.
Publisher: Wiley
Date: 24-08-2018
Abstract: Pulsed electrodeposition has been introduced to deposit ultrathin flakes of Co
Publisher: Wiley
Date: 03-03-2021
Publisher: Wiley
Date: 03-03-2021
Publisher: Springer Science and Business Media LLC
Date: 04-04-2018
No related grants have been discovered for Hao Wu.