Coupling Molecularly Ultrathin Sheets of NiFe-Layered Double Hydroxide on NiCo2O4 Nanowire Arrays for Highly Efficient Overall Water-Splitting Activity
Coupling Molecularly Ultrathin Sheets of NiFe-Layered Double Hydroxide on NiCo2O4 Nanowire Arrays for Highly Efficient Overall Water-Splitting Activity
复制标题
NiCo2O4 纳米线阵列上的 NiFe 层状双氢氧化物分子超薄片的耦合可实现高效的整体水分解活性
DOI：
10.1021/acsami.6b13075
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发表时间：
2017-01-18
影响因子：
9.5
通讯作者：
Geng, Fengxia
中科院分区：
文献类型：
--
作者：
Wang, Zhiqiang;Zeng, Sha;Geng, Fengxia
随着对清洁和可再生能源的需求不断增加，开发用于碱性介质中整体水分解的高效但非贵重的双功能电催化剂已成为深入研究的焦点。在此，我们报告了一种新型分层混合电极的合成，NiFe层状双氢氧化物分子超薄片生长在NiCO2O4纳米线阵列上，该阵列由薄板组装而成，并以镍泡沫为支架支撑，其中催化金属位点更容易接近和活跃，最重要的是化学性强：界面处存在耦合，使优异的性能成为可能。 在相同的碱性 KOH 电解质中对析氧反应 (OER) 和析氢反应 (HER) 具有催化能力。与已记录的非贵金属 HER 和 OER 电催化剂相比，该行为堪称一流，甚至可以与最先进的贵金属电催化剂 Pt 和 RuO2 相媲美。当制造为集成碱性水电解槽时，所设计的电极可以在1.60 V的相当低的电池电压下提供10 mA cm(-2)的电流密度，有望将该材料作为全细胞水分解的高效双功能催化剂。
Developing efficient but nonprecious bifunctional electrocatalysts for overall water splitting in-basic media has been the subject of intensive research focus with the increasing, demand for clean and regenerated energy. Herein, we report on the synthesis of a novel hierarchical hybrid electrode, NiFe-layered double hydroxide molecularly ultrathin sheets grown on NiCO2O4 nanowire arrays assembled from thin platelets with nickel foam as-the scaffold support in which the catalytic metal Sites ate more accessible and active and most importantly strong Chemical:, coupling exists at the interface, enabling Superior catalytic power toward both oxygen evolution reaction (OER) and additionally hydrogen evolution reaction (HER) in the same alkaline KOH electrolyte. The behavior ranks top-class Compared with documented non-noble HER and OER electrocatalysts and even comparable to state-of-the-art noble-metal electrocatalysts, Pt and RuO2. When fabricated as an integrated alkaline water electrolyzer, the designed electrode can deliver a current density of 10 mA cm(-2) at a fairly low cell voltage of 1.60 V, promising the material as efficient bifunctional catalysts toward whole cell water splitting.