Shaohua Zhong

Bio: Shaohua Zhong is an academic researcher from Wuhan University of Technology. The author has contributed to research in topics: Perovskite (structure) & Solid oxide fuel cell. The author has an hindex of 3, co-authored 7 publications receiving 54 citations.

Enhanced electrochemical activity and stability of LSCF cathodes by Mo doping for intermediate temperature solid oxide fuel cells

Abstract: La0.6Sr0.4Co0.2Fe0.8O3−δ (LSCF), La0.6Sr0.4Co0.2Fe0.78Mo0.02O3−δ (LSCFM02), La0.6Sr0.4Co0.2Fe0.75Mo0.05O3−δ (LSCFM05) cathodes were prepared and their electrochemical performance and stability were investigated. Mo doping into LSCF, which is confirmed by X-ray diffraction (XRD) and Rietveld refinement, increases unit cell parameters from 3.893 to 3.924 A, causing expansion of unit cell volume. Polarization resistance (Rp) value of LSCFM05 cathodes is less that of LSCF cathodes at 750 °C, indicating that Mo-doped LSCF exhibits enhanced electrochemical performance. X-ray photoelectron spectroscopy (XPS) analysis shows that high electrocatalytic activity for oxygen reduction reaction of Mo-doped LSCF cathodes is related to mixed-valent Mo5+/Mo6+. LSCFM05 cathodes have less degradation rate during 20 h testing at 700 °C in air compared to LSCF cathodes. XPS results show that Mo doping reduces Sr surface segregation and is responsible for the stability enhancement of LSCF cathodes.

Recent Progresses in Electrocatalysts for Water Electrolysis

Abstract: The study of hydrogen evolution reaction and oxygen evolution reaction electrocatalysts for water electrolysis is a developing field in which noble metal-based materials are commonly used. However, the associated high cost and low abundance of noble metals limit their practical application. Non-noble metal catalysts, aside from being inexpensive, highly abundant and environmental friendly, can possess high electrical conductivity, good structural tunability and comparable electrocatalytic performances to state-of-the-art noble metals, particularly in alkaline media, making them desirable candidates to reduce or replace noble metals as promising electrocatalysts for water electrolysis. This article will review and provide an overview of the fundamental knowledge related to water electrolysis with a focus on the development and progress of non-noble metal-based electrocatalysts in alkaline, polymer exchange membrane and solid oxide electrolysis. A critical analysis of the various catalysts currently available is also provided with discussions on current challenges and future perspectives. In addition, to facilitate future research and development, several possible research directions to overcome these challenges are provided in this article.

High‐Temperature CO 2 Electrolysis in Solid Oxide Electrolysis Cells: Developments, Challenges, and Prospects

Abstract: High-temperature CO2 electrolysis in solid-oxide electrolysis cells (SOECs) could greatly assist in the reduction of CO2 emissions by electrochemically converting CO2 to valuable fuels through effective electrothermal activation of the stable CO bond. If powered by renewable energy resources, it could also provide an advanced energy-storage method for their intermittent output. Compared to low-temperature electrochemical CO2 reduction, CO2 electrolysis in SOECs at high temperature exhibits higher current density and energy efficiency and has thus attracted much recent attention. The history of its development and its fundamental mechanisms, cathode materials, oxygen-ion-conducting electrolyte materials, and anode materials are highlighted. Electrode, electrolyte, and electrode-electrolyte interface degradation issues are comprehensively summarized. Fuel-assisted SOECs with low-cost fuels applied to the anode to decrease the overpotential and electricity consumption are introduced. Furthermore, the challenges and prospects for future research into high-temperature CO2 electrolysis in SOECs are included.

Ruddlesden–Popper perovskites in electrocatalysis

Abstract: Electrocatalysis lies in the center of many clean energy conversion and storage technologies. Developing efficient electrocatalysts to promote the kinetics of the key chemical reactions involved in these processes represents an important research topic. Ruddlesden–Popper perovskites (An+1BnX3n+1), as a layered derivative of the perovskite family (ABX3), are an important class of solid-state materials, and are emerging as high-performing electrocatalysts due to their unique layered structure and rich chemical compositions. In this review, we provide a comprehensive understanding of the structure and properties of Ruddlesden–Popper perovskites in the context of their electrocatalysis applications. We also summarize the recent developments of Ruddlesden–Popper perovskites for catalyzing a breadth of electrochemical reactions at both low and high temperatures. We highlight how Ruddlesden–Popper perovskites can be tailored through a range of design strategies to achieve improved electrocatalysis. Finally, we provide perspectives on future research directions that further expand the electrocatalytic possibilities of Ruddlesden–Popper perovskites.