Abstract Since the support of conventional electrocatalysts is mostly inert, certain parts of these supported electrocatalysts that have direct contact with the reactants do not have electrocatalytic function. Therefore, the surface area of these electrocatalysts is larger than their electrochemically active surface area. So as to make full use of the available surface area and release the activity potential of the electrocatalysts, this work synthesized a carbon-based active support with certain electrocatalytic activity for water oxidation reaction, providing a general route to prepare electrocatalysts with electrochemically active surface area close to their surface area. In detail, a cubic core-shell support was synthesized via an aqueous phase synthesis method for oxygen evolution reaction (OER). The carbon-based active support with a larger specific surface area (306 m2 g−1) is beneficial to the dispersion of the active sites. The support has appropriate OER catalytic activity which can synergistically catalyze OER together with NiFe (oxy)hydroxide on it during the reaction. Under the current density of 10 mA cm−2, the overpotential is as low as 214 mV for OER, which is better than those of most non-precious metal catalysts, suggesting that carbon-based active support could effectively reduce energy consumption via promoting surface area utilization ratio.

中文翻译：

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用于水氧化电催化剂的碳基活性载体：充分利用可用表面积

摘要 由于传统电催化剂的载体大多是惰性的，这些负载型电催化剂中与反应物直接接触的部分不具有电催化功能。因此，这些电催化剂的表面积大于它们的电化学活性表面积。为了充分利用可用表面积，释放电催化剂的活性电位，本工作合成了一种具有一定电催化活性的碳基活性载体用于水氧化反应，为制备具有电化学活性表面积的电催化剂提供了一条通用途径。接近它们的表面积。具体而言，通过析氧反应（OER）的水相合成方法合成了立方核壳载体。具有较大比表面积（306 m2 g-1）的碳基活性载体有利于活性位点的分散。该载体具有适当的OER催化活性，在反应过程中可以与其上的NiFe（羟基）氢氧化物协同催化OER。在 10 mA cm−2 的电流密度下，OER 的过电位低至 214 mV，优于大多数非贵金属催化剂，表明碳基活性载体可以通过促进表面活性有效降低能耗。面积利用率。