Superlattice-Like Co-Doped Mn Oxide and NiFe Hydroxide Nanosheets toward an Energetic Oxygen Evolution Reaction
Superlattice-Like Co-Doped Mn Oxide and NiFe Hydroxide Nanosheets toward an Energetic Oxygen Evolution Reaction
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超晶格共掺杂氧化锰和氢氧化镍铁纳米片用于高能析氧反应
DOI：
10.1021/acssuschemeng.2c00773
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发表时间：
2022-04
影响因子：
8.4
通讯作者：
Hao Wan
中科院分区：
文献类型：
--
作者：
Ying Zhang;Xia Long;Xiaohe Liu;Gen Chen;Junhua Hu;Mimi Li;Renzhi Ma;Hao Wan
设计高效的无贵金属电催化剂是析氧反应(OER)在水分解领域应用面临的迫切挑战。然而，催化剂的稳定性和导电性较差，阻碍了其工业化应用。本文通过插层剥离法制备了钴取代锰氧化物(MnCo-O)单分子膜纳米片，并将镍铁双氢氧化物(NiFe-OH)纳米片作为高活性组分。相反电荷的MnCo-O和NiFe-OH纳米片层将堆积成具有1 nm∼交替层的超晶格(MnCo/NiFe)。以氢氧化钾(KOH)溶液为电解液，制备的MnCo/NiFe复合材料具有良好的过电流变性能，在电流密度为10 mA cm−2时有较小的过电位(2 33 MV)，塔菲尔斜率(46 mV dec-1)较小。该催化剂的催化寿命可达50h以上，且几乎没有衰减。这项研究开发了一种可扩展的策略，以同时以低成本实现高性能无贵金属电催化剂的独特结构。
Designing efficient electrocatalysts without noble metals is an imperative challenge for the oxygen evolution reaction (OER) application used in the water-splitting field. However, the low catalytic stability and conductivity impede the industrial application. Herein, the cobalt-substituted manganese oxide (MnCo-O) monolayer nanosheet was exfoliated via intercalation, and the nickel iron double hydroxide (NiFe-OH) nanosheet served as a highly active composition. The oppositely charged MnCo-O and NiFe-OH nanosheet would stack into the superlattice (MnCo/NiFe) with alternating layers of ∼1 nm. Using potassium hydroxide (KOH) solution as the electrolyte, the MnCo/NiFe composite material delivered superior OER performances, which showed a small overpotential (233 mV) at current density of 10 mA cm−2and low Tafel slope (46 mV dec–1). Such a catalyst could further present long-term catalytic durability of more than 50 h with almost no attenuation. This study develops a scalable strategy to simultaneously achieve a distinctive structure at a low cost for a high-performance noble-metal-free electrocatalyst.
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