Fe/Co Double Hydroxide/Oxide Nanoparticles on N‐Doped CNTs as Highly Efficient Electrocatalyst for Rechargeable Liquid and Quasi‐Solid‐State Zinc–Air Batteries. Issue 30 (14th September 2018)

• Record Type: Journal Article
• Authors: Wu, Mingjie; Wei, Qiliang; Zhang, Gaixia; Qiao, Jinli; Wu, Mingxing; Zhang, Jihai; Gong, Qiaojuan; Sun, Shuhui
• Is Part Of: Advanced energy materials. Volume 8:Issue 30(2018)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2018-09-14
• Subjects: Fe/Co double hydroxides/oxides -- liquid and all‐solid‐state -- OER -- ORR -- ZABs; Energy harvesting -- Materials -- Periodicals; Energy conversion -- Materials -- Periodicals; Energy storage -- Materials -- Periodicals; Photovoltaics -- Periodicals; Fuel cells -- Periodicals; Thermoelectric materials -- Periodicals; 621.31
• DOI: 10.1002/aenm.201801836
• Languages: English
• ISSNs: 1614-6832

Abstract

Abstract: Oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) are the cornerstones of rechargeable zinc–air batteries (ZABs). The exploration and rational design of high‐performance, durable, and nonprecious metal bifunctional oxygen electrocatalysts is highly desired for the large‐scale application of rechargeable ZABs. Herein, an effective and straightforward coupling approach is developed to fabricate high‐performance bifunctional ORR/OER electrocatalysts based on novel nanostructured amorphous bimetal Fe/Co hydroxide/oxide nanoparticles (10–20 nm) inlaid on multiwalled N‐dopted carbon nanotubes (FeCo‐DHO/NCNTs). Fe/Co nanoparticles achieve a maximum contact area on the NCNTs, effectively facilitating the rapid electron transport and preventing the aggregation of nanoparticles. Consequently, the as‐prepared FeCo‐DHO/NCNTs show a half‐wave potential of 0.86 V for ORR and a low operating potential of 1.55 V at 10 mA cm −2 for OER in 1.0m KOH, superior to most bifunctional oxygen electrocatalysts reported so far. Moreover, the assembled all‐solid‐state zinc–air batteries with FeCo‐DHO/NCNTs catalyst as the air electrode demonstrate remarkable stability over long‐term cycling and excellent charging–discharging performance, with a low voltage gap (1.085 V at 60 mA cm −2 ) and high energy efficiency (60% at 10 mA cm −2 ) under ambient conditions. Abstract : The bimetal synergetic coupling interaction favours the formation of amorphous Fe/Co double hydroxide/oxide nanoparticles on N‐doped carbon nanotubes, which provides more transportation channels than that of the highly crystalline phase, and consequently greatly facilitates the sluggish oxygen electrochemical reaction kinetics. The assembled zinc–air batteries demonstrate excellent charging–discharging performance and ultra‐long cycling lifetimes.