Abstract Cost-effective and earth-abundant electrocatalysts with high activity for oxygen evolution reaction (OER) is essential for achieving efficient and economical electrochemical water splitting. In this work, we developed a facile low-temperature coprecipitation approach to synthesize NiFe layered double hydroxide (NiFe LDH). By tuning Ni/Fe feed ratio and using Na2CO3 as precipitant, mesoporous NiFe LDH nanoparticles were obtained. The special physicochemical features of these NiFe LDH nanoparticles, including high degree of crystallization, large pore volume and abundant crystalline/amorphous interfaces, synergistically endowed the catalyst with enriched active sites. Consequently, the optimal Ni0.66Fe0.33 LDH electrocatalyst showed excellent activity toward OER in alkaline media, with a low overpotential of 248 mV to deliver a current density of 10 mA cm−2, a small Tafel slope of 46 mV dec−1, and strong durability. This work opens an innovative avenue toward the design of advanced NiFe-based catalysts.

中文翻译：

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具有大孔体积的结晶NiFe层状双氢氧化物作为析氧电催化剂

摘要 具有高活性析氧反应 (OER) 的经济高效且资源丰富的电催化剂对于实现高效、经济的电化学水分解至关重要。在这项工作中，我们开发了一种简便的低温共沉淀方法来合成 NiFe 层状双氢氧化物 (NiFe LDH)。通过调整 Ni/Fe 进料比并使用 Na2CO3 作为沉淀剂，获得了介孔 NiFe LDH 纳米颗粒。这些NiFe LDH纳米粒子的特殊物理化学特性，包括高度结晶、大孔体积和丰富的结晶/非晶界面，协同赋予催化剂丰富的活性位点。因此，最佳的 Ni0.66Fe0.33 LDH 电催化剂在碱性介质中表现出优异的 OER 活性，具有 248 mV 的低过电位，可提供 10 mA cm-2 的电流密度、46 mV dec-1 的小塔菲尔斜率和强大的耐用性。这项工作为设计先进的 NiFe 基催化剂开辟了一条创新途径。