ORCID Profile
0000-0002-1799-3219
Current Organisations
University of New South Wales
,
University of Oxford
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Publisher: Royal Society of Chemistry (RSC)
Date: 2020
DOI: 10.1039/D0EE00666A
Abstract: A PH 3 vapor-assisted phase and structure engineering strategy to convert non-active NiTe into super-active Ni 2 P/NiTe 2 catalysts for hydrogen evolution reaction.
Publisher: American Chemical Society (ACS)
Date: 03-08-2016
DOI: 10.1021/ACS.INORGCHEM.6B01200
Abstract: The present work reports data for the mineralogical and chemical properties of anatase thin films in idually doped or codoped with chromium and vanadium, fabricated by sol-gel spin coating on glass substrates and annealing at 450 °C for 2 h. X-ray photoelectron spectroscopy data indicated the presence of Ti(4+), Ti(3+), Cr(3+), and possibly Cr(4+) in the Cr-doped thin films Ti(4+), Ti(3+), V(3+), V(4+), and possibly V(5+) in the V-doped thin films and Ti(4+), Ti(3+), Cr(3+), Cr(4+), V(3+), V(4+), and possibly V(5+) in the codoped thin films. While the thermodynamically stable valences Ti(4+), Cr(3+), and V(5+) would be expected to have formed, the presence of the nonequilibrium valences Ti(3+), Cr(4+), V(3+), and V(4+) is considered to have resulted from intervalence charge transfer for the Cr-doped and V-doped systems but from multivalence charge transfer (MVCT) for the codoped system. The latter phenomenon, which is introduced as a new conceptual term, describes the nature of the mutual exchange of electrons during valence changes of both dopant (Cr, V) and matrix (Ti) ions during annealing. In the present case, MVCT appears to be a transient metastable condition that acts during annealing, but subsequent UV irradiation can alter its effects.
Publisher: Wiley
Date: 07-01-2019
Abstract: Conductive metal oxides represent a new category of functional material with vital importance for many modern applications. The present work introduces a new conductive metal oxide V
Publisher: Elsevier BV
Date: 12-2021
Publisher: Royal Society of Chemistry (RSC)
Date: 2018
DOI: 10.1039/C8TA08211A
Abstract: Enhanced catalytic activity of Co 3 O 4 @CoS x through surface sulfurization.
Publisher: Wiley
Date: 08-01-2019
Abstract: Nickel-heteroatoms bridge sites are important reaction descriptors for many catalytic and electrochemical processes. Herein we report the controllable surface modification of nickel-nitrogen (Ni-N) bridge sites on metallic Ni particles via a simplified vapor-assisted treatment approach. X-ray absorption spectroscopy (XAS) and Operando Raman spectroscopy verifies the interaction between Ni and surface-anchored N, which leads to distorted Ni lattice structure with improved wettability. The Ni-N bridge sites with appropriate N coverage level plays a critical role in the enhanced hydrogen evolution reaction (HER) and the optimized electrode (Ni-N
Publisher: Elsevier BV
Date: 05-2014
Publisher: Elsevier BV
Date: 10-2020
Publisher: Elsevier BV
Date: 04-2018
Publisher: Royal Society of Chemistry (RSC)
Date: 2020
DOI: 10.1039/C9TA13170A
Abstract: Electrocatalytic activities of electrodes for water splitting are assessed via geometric area, BET surface area and ECSA normalisations.
Publisher: Elsevier BV
Date: 2019
Publisher: Springer Science and Business Media LLC
Date: 06-2020
DOI: 10.1038/S41467-020-16554-5
Abstract: Nickel-based catalysts are most commonly used in industrial alkaline water electrolysis. However, it remains a great challenge to address the sluggish reaction kinetics and severe deactivation problems of hydrogen evolution reaction (HER). Here, we show a Cu-doped Ni catalyst implanted with Ni-O-VOx sites (Ni(Cu)VOx) for alkaline HER. The optimal Ni(Cu)VOx electrode exhibits a near-zero onset overpotential and low overpotential of 21 mV to deliver –10 mA cm −2 , which is comparable to benchmark Pt/C catalyst. Evidence for the formation of Ni-O-VOx sites in Ni(Cu)VOx is established by systematic X-ray absorption spectroscopy studies. The VOx can cause a substantial d ening of Ni lattice and create an enlarged electrochemically active surface area. First-principles calculations support that the Ni-O-VOx sites are superactive and can promote the charge redistribution from Ni to VOx, which greatly weakens the H-adsorption and H 2 release free energy over Ni. This endows the Ni(Cu)VOx electrode high HER activity and long-term durability.
Publisher: American Chemical Society (ACS)
Date: 23-12-2019
Publisher: American Chemical Society (ACS)
Date: 09-01-2020
Publisher: Royal Society of Chemistry (RSC)
Date: 2018
DOI: 10.1039/C8NJ03083A
Abstract: The role and mechanism of doping in the extrinsic and intrinsic effects on photocatalysts.
Publisher: Springer Science and Business Media LLC
Date: 16-12-2022
Publisher: American Chemical Society (ACS)
Date: 10-01-2022
Publisher: Elsevier BV
Date: 03-2017
DOI: 10.1016/J.JHAZMAT.2016.08.072
Abstract: Since there is increasing concern for the impact of air quality on human health, the present work surveys the materials and technologies for air purification using photocatalytic materials. The coverage includes (1) current photocatalytic materials for the decomposition of chemical contaminants and disinfection of pathogens present in air and (2) photocatalytic air purification systems that are used currently and under development. The present work focuses on five main themes. First, the mechanisms of photodegradation and photodisinfection are explained. Second, system designs for photocatalytic air purification are surveyed. Third, the photocatalytic materials used for air purification and their characteristics are considered, including both conventional and more recently developed photocatalysts. Fourth, the methods used to fabricate these materials are discussed. Fifth, the most significant coverage is devoted to materials design strategies aimed at improving the performance of photocatalysts for air purification. The review concludes with a brief consideration of promising future directions for materials research in photocatalysis.
Location: United Kingdom of Great Britain and Northern Ireland
No related grants have been discovered for Hangjuan Ren.