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Dive into the research topics where Jessica A. Allen is active.

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Featured researches published by Jessica A. Allen.


Science of The Total Environment | 2018

Microstructural and associated chemical changes during the composting of a high temperature biochar: Mechanisms for nitrate, phosphate and other nutrient retention and release

Stephen Joseph; Claudia Kammann; Jessica G. Shepherd; Pellegrino Conte; Hans-Peter Schmidt; Nikolas Hagemann; Anne M. Rich; Christopher E. Marjo; Jessica A. Allen; Paul Munroe; David R. G. Mitchell; Scott W. Donne; Kurt A. Spokas; Ellen R. Graber

Recent studies have demonstrated the importance of the nutrient status of biochar and soils prior to its inclusion in particular agricultural systems. Pre-treatment of nutrient-reactive biochar, where nutrients are loaded into pores and onto surfaces, gives improved yield outcomes compared to untreated biochar. In this study we have used a wide selection of spectroscopic and microscopic techniques to investigate the mechanisms of nutrient retention in a high temperature wood biochar, which had negative effects on Chenopodium quinoa above ground biomass yield when applied to the system without prior nutrient loading, but positive effects when applied after composting. We have compared non-composted biochar (BC) with composted biochar (BCC) to elucidate the differences which may have led to these results. The results of our investigation provide evidence for a complex series of reactions during composting, where dissolved nutrients are first taken up into biochar pores along a concentration gradient and through capillary action, followed by surface sorption and retention processes which block biochar pores and result in deposition of a nutrient-rich organomineral (plaque) layer. The lack of such pretreatment in the BC samples would render it reactive towards nutrients in a soil-fertilizer system, making it a competitor for, rather than provider of, nutrients for plant growth.


Agronomy | 2015

The Electrochemical Properties of Biochars and How They Affect Soil Redox Properties and Processes

Stephen Joseph; Olivier Husson; Ellen R. Graber; Lukas Van Zwieten; Sara Taherymoosavi; Torsten Thomas; Shaun Nielsen; Jun Ye; Genxing Pan; Chee Chia; Paul Munroe; Jessica A. Allen; Yun Lin; Xiaorong Fan; Scott W. Donne


Journal of Power Sources | 2014

Influence of selected coal contaminants on graphitic carbon electro-oxidation for application to the direct carbon fuel cell

John Tulloch; Jessica A. Allen; Louis Wibberley; Scott W. Donne


Journal of Power Sources | 2015

The effect of coal type and pyrolysis temperature on the electrochemical activity of coal at a solid carbon anode in molten carbonate media

Jessica A. Allen; Michael Glenn; Scott W. Donne


Electrochimica Acta | 2014

Kinetic Analysis of the Anodic Carbon Oxidation Mechanism in a Molten Carbonate Medium

Jessica A. Allen; John Tulloch; Louis Wibberley; Scott W. Donne


Carbon | 2017

Synchrotron based NEXAFS study on nitrogen doped hydrothermal carbon: Insights into surface functionalities and formation mechanisms

Kenneth G. Latham; Michela I. Simone; Wesley M. Dose; Jessica A. Allen; Scott W. Donne


Journal of The Electrochemical Society | 2016

Dynamic Electrodeposition of Manganese Dioxide: Temporal Variation in the Electrodeposition Mechanism

Andrew J. Gibson; Bernt Johannessen; Yaser Beyad; Jessica A. Allen; Scott W. Donne


Electrochimica Acta | 2015

Carbonate Reduction and the Properties and Applications of Carbon Formed Through Electrochemical Deposition in Molten Carbonates: A Review

Matthew Hughes; Jessica A. Allen; Scott W. Donne


Carbon | 2018

Nitrogen doped heat treated and activated hydrothermal carbon: NEXAFS examination of the carbon surface at different temperatures

Kenneth G. Latham; Wesley M. Dose; Jessica A. Allen; Scott W. Donne


Journal of The Electrochemical Society | 2015

Molten Carbonate Composition Effects on Carbon Electro-Oxidation at a Solid Anode Interface

Jessica A. Allen; J. White; Michael Glenn; Scott W. Donne

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John Tulloch

University of Newcastle

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Louis Wibberley

Commonwealth Scientific and Industrial Research Organisation

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Paul Munroe

University of New South Wales

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Stephen Joseph

University of New South Wales

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