Advanced Materials for Energy Conversion and Storage 2022: Poster Session
Sponsored by: TMS Functional Materials Division, TMS: Energy Conversion and Storage Committee
Program Organizers: Jung Choi, Pacific Northwest National Laboratory; Soumendra Basu, Boston University; Paul Ohodnicki, University of Pittsburgh; Partha Mukherjee, Purdue University; Surojit Gupta, University of North Dakota; Amit Pandey, Lockheed Martin Space; Kyle Brinkman, Clemson University

Monday 5:30 PM
February 28, 2022
Room: Exhibit Hall C
Location: Anaheim Convention Center

Session Chair: Soumendra Basu, Boston University; Jung Pyung Choi, Pacific Northwest National Laboratory

D-2: Crystal Facet-controlled SnS Photocathodes for Bias-free Photoelectrochemical Solar Water Splitting: Hyungsoo Lee1; Jaemin Park1; Young Sun Park1; Juwon Yun1; Jooho Moon1; 1Yonsei University
    To achieve a high solar-to-hydrogen (STH) conversion efficiency, delicate strategies towards high photocurrent together with sufficient onset potential should be developed. Herein, we report a SnS semiconductor as a high-performance photocathode. Use of proper sulfur precursor having weak dipole moment allows us to obtain high-quality dense SnS nanoplates with enlarged favorable crystallographic facet, while surpressing inevitable anisotropic growth. Furthermore, the introducing Ga2O3 layer between SnS and TiO2 in SnS photocathodes efficiently improves the charge transport kinetics without charge trapping. The SnS photocathode reveals the highest photocurrent density of 28 mA cm−2 at 0 V versus the reversible hydrogen electrode. We for the first time demonstrate overall solar water splitting by combining the optimized SnS photocathode with a Mo:BiVO4 photoanode, achieving a STH efficiency of 1.7% and long-term stability of 24 h. High performance and low-cost SnS photocathode represents a promising new material in the field of PEC solar water splitting.

D-3: Degradation Characteristics of PU Foam in District Heating Pipe under Accelerated Aging Condition: Hyung-Gyu Kim1; Jooyong Kim2; Hea-Yong Lee2; Jonghun Yoon1; 1Hanyang University; 2Korea District Heating Corporation(KDHC)
    The shear strength of 0.12MPa or more and the shear strength in aged condition shall be minimum 45% of the shear strength in non aged condition, in order to determine whether the aged DH(District Heating) pipe can be used continuously based on EN253. However, in general DH pipes, it is inevitable to have an uneven distribution of shear strength because PU(Polyurethane) foam cannot be uniformly foamed during production. It was experimentally confirmed that different shear strengths were measured according to the longitudinal direction in the DH pipe, and the correlation between density and shear strength was derived by measuring the density at each location. In addition, there was little change in density after accelerated aging by applying a high temperature condition, and it was possible to predict the initial shear strength by measuring the density. This research is expected that the accuracy of the residual life prediction can be improved.

D-7: On Recent Development in Two-dimensional Transition Metal Dichalcolgenides for Applications in Hydrogen Evolution Reaction: Chukwudike Ukeje; 1
    The evolution of hydrogen from water through Hydrogen Evolution Reaction (HER) is considered a stimulating strategy for the production and storage of clean energy. However, a militating factor against the full implementation of HER is the shortage of electrocatalysts required to trigger the reaction. While noble metal such as Pt has been found to provide significant catalytic activity for HER implementation, nonetheless, the scarcity and cost of this rare metal pose a challenge for its utilization in large-scale HER processes. Two-Dimensional Transitional Metal Dichalcogenides (2D TMDs) have been found to possess significant catalytic properties capable of driving HER. This paper highlights the recent progress in the development of 2D TMDs for HER application. Major highlights include recent advancements in the synthesis of 2D TMDs and strategies employed in improving their performance in the catalysis of HER. Challenges in their utilization for HER application and possible future developments are also discussed.

D-8: Study on a Short Process Method for Preparation of 3.5 Valence Vanadium Electrolyte: Zhengtuan Li1; Lanjie Li1; Heli Wan2; 1Chengde Iron and Steel Group Co., Ltd, HBIS Group Co.,LTD.; 2National Engineering Laboratory for Vacuum Metallurgy
    This study reports on the preparation of high-purity electrolyte containing vanadium of 3.5+. It can be realized in a short process to prepare the electrolyte of the all-vanadium redox flow battery through the optimization of different parameters. The results show that a sample with stable reduction valence (V: 3.5+) can be obtained when vanadium pentoxide is used as the raw material, the reducing gas volume ratio is N2: CO: H2 = 80: 17: 3, and the reduction temperature and time are controlled at 700℃ and 2h, respectively. In addition, the concentration of sulfuric acid 4M is selected as the reaction solution, and the vanadium ion concentration of the electrolyte solution is between 1.5-1.6. The single cell made of vanadium electrolyte can run stably for 500 hours, charge and discharge 100 times, and basically maintain energy efficiency at around 82%. It has very good industrial application prospects.