材料科学
电催化剂
分解水
电池(电)
化学工程
杂原子
析氧
无机化学
电化学
催化作用
电极
化学
有机化学
光催化
物理
工程类
物理化学
功率(物理)
量子力学
戒指(化学)
作者
Mopidevi Manikanta Kumar,C. Retna Raj
标识
DOI:10.1021/acsami.1c24918
摘要
The rational design and synthesis of efficient multifunctional electrocatalysts for renewable energy technologies is of significant interest. Herein, we demonstrate a novel approach for the synthesis of a nitrogen and phosphorus dual-doped mesoporous carbon-encapsulated iron phosphide (FeP@NPC) nanostructure and its multifunctional electrocatalytic activity toward an oxygen reduction reaction, oxygen evolution reaction, and hydrogen evolution reaction for zinc-air battery (ZAB) and alkaline water-splitting applications. FeP@NPC is obtained by the carbothermal reduction of the precursor complex [Fe(bpy)3](PF6)2 in the presence of melamine without any traditional phosphidating agent. The PF6- counteranion is used for the phosphidation of Fe. FeP@NPC obtained at 900 °C (FeP@NPC-900) exhibits excellent bifunctional oxygen electrocatalytic performance with a very low potential gap (ΔE = E1/2ORR - Ej10OER) of 670 mV. The ZAB device delivers a peak power density of 190.15 mW cm-2 (iR-corrected), specific capacity of 785 mA h gZn-1, and energy density of 706.5 Wh kgZn-1 at 50 mA cm-2. The ZAB exhibits excellent charge-discharge cycling stability for over 35 h with negligible voltaic efficiency loss (0.9%). Three CR2032 coin-cell-based ZABs made of an FeP@NPC-900 air cathode connected in series power 81 LEDs for 15 min. FeP@NPC-900 also has promising electrocatalytic activity toward water splitting in acidic as well as in alkaline pH. The benchmark current density of 10 mA cm-2 is achieved with a two-electrode alkaline water electrolyzer at a cell voltage of 1.65 V. ZAB-powered water electrolyzer is made by integrating two rechargeable ZABs connected in series with the two-electrode water electrolyzer. The ZAB powers the electrolyzer for 24 h without a significant loss in the open-circuit voltage. The catalyst retains its initial structural integrity even after continuous water electrolysis for 24 h.
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