气候变化领域集成服务门户(CCPortal): A low temperature unitized regenerative fuel cell realizing 60% round trip efficiency and 10 000 cycles of durability for energy storage applications

CCPortal

DOI	10.1039/c9ee03626a
	A low temperature unitized regenerative fuel cell realizing 60% round trip efficiency and 10 000 cycles of durability for energy storage applications
	Regmi Y.N.; Peng X.; Fornaciari J.C.; Wei M.; Myers D.J.; Weber A.Z.; Danilovic N.
发表日期	2020
ISSN	17545692
起始页码	2096
结束页码	2105
卷号	13 期号:7
英文摘要	Unitized regenerative fuel cells (URFC) convert electrical energy to and from chemical bonds in hydrogen. URFCs have the potential to provide economical means for efficient long-term, seasonal, energy storage and on-demand conversion back to electrical energy. We first optimize the catalyst layer for discrete electrolyzer and fuel cell and then configure the URFC. The goal is to identify a cost competitive configuration for URFCs, and demonstrate it in terms of upper limit of round trip efficiencies (RTEs). Two possible configurations of URFCs are compared via experiments and techno-economic analysis (TEA), which emphasize the advantages of the unconventional constant-electrode (CE) URFC over the traditional constant-gas (CG) configuration. We also study the stability via accelerated stress tests (ASTs) and demonstrate steady state operation in a daily cycle for day to night energy shifting. From the investigations, the optimum composition of the URFC anode catalyst layer is 90 at% Ir-black balanced by Pt-black for both CE and CG configurations. At 80 °C and 1 A cm-2, the optimized CE URFC achieves 57% and 60% RTE with air and O2 as the reductant gases, respectively. We then evaluated the differences in durability using an AST over 10k charge-discharge cycles; the results reveal that the wider potential window at the anode in CE (0.05-1.55 V) has minimal effect on catalyst layer stability compared to CG (0.55-1.55 V). Furthermore, there was no degradation up to the range of 2k-5k cycles; beyond that the fuel cell (discharge) performance degraded while the electrolyzer (charge) performance was still stable. The observations here indicate substantial potential to employ URFCs as efficient and cost-effective bidirectional energy-conversion devices within energy storage and utilization systems after appropriate technological and operational optimizations. © 2020 The Royal Society of Chemistry.
英文关键词	Anodes; Bond strength (chemical); Catalysts; Cost effectiveness; Durability; Economic analysis; Electrolytic cells; Energy storage; Fuel storage; Hydrogen bonds; Regenerative fuel cells; Tea; Temperature; Anode catalyst layer; Charge-discharge cycle; Energy conversion devices; Energy storage applications; Operational optimization; Steady-state operation; Techno-Economic analysis; Unitized regenerative fuel cell (URFC); Conversion efficiency; durability; energy efficiency; energy storage; fuel cell; low temperature
语种	英语
来源期刊	Energy & Environmental Science
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/189610
作者单位	Energy Storage and Distributed Resources Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, United States; Department of Chemical and Biomolecular Engineering, University of California Berkeley, Berkeley, CA 94720, United States; Energy Analysis and Environmental Impacts Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, United States; Chemical Sciences and Engineering Division, Argonne National Laboratory, Lemont, IL 60439, United States
推荐引用方式 GB/T 7714	Regmi Y.N.,Peng X.,Fornaciari J.C.,et al. A low temperature unitized regenerative fuel cell realizing 60% round trip efficiency and 10 000 cycles of durability for energy storage applications[J],2020,13(7).
APA	Regmi Y.N..,Peng X..,Fornaciari J.C..,Wei M..,Myers D.J..,...&Danilovic N..(2020).A low temperature unitized regenerative fuel cell realizing 60% round trip efficiency and 10 000 cycles of durability for energy storage applications.Energy & Environmental Science,13(7).
MLA	Regmi Y.N.,et al."A low temperature unitized regenerative fuel cell realizing 60% round trip efficiency and 10 000 cycles of durability for energy storage applications".Energy & Environmental Science 13.7(2020).