Controlled synthesis of highly active bifunctional electrocatalysts for overall water splitting using coal-based activated carbons,Journal of Materials Chemistry A

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Controlled synthesis of highly active bifunctional electrocatalysts for overall water splitting using coal-based activated carbons
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2022-11-11 , DOI: 10.1039/d2ta06595a
Xianglong Zhao ₁ , Xinghua Yong ₁ , Qizhe Ji ₁ , Zhenghua Yang ₁ , Yang Song ₂ , Yiqiang Sun ₃ , Zhengyang Cai ₄ , Jingcheng Xu ₅ , Luyan Li ₁ , Shuhua Shi ₁ , Feiyong Chen ₂ , Cuncheng Li ₃ , Ping Wang ₄ , Jong-Beom Baek ₆

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We report a facile approach for the synthesis of highly active bifunctional electrocatalysts for the oxygen evolution reaction (OER) and hydrogen evolution reaction (HER), by simply annealing mixtures of cheap coal-based activated carbons (CACs), ruthenium chloride and nickel chlorides in ammonia. The electrocatalysts consist of nitrogen doped CACs (NCACs), which are uniformly decorated with ruthenium (Ru) (with a low content of 0.3 wt%) and nickel nitride (Ni₃N) nanoparticles (Ni₃N/Ru/NCAC composites). The Ni₃N/Ru/NCAC composites have a large surface area (853 m² g⁻¹), which is proven to be attributable to the inherent large surface area of the CACs and the easy etching of CACs during an annealing process in ammonia. Electrochemical measurements reveal that OER electrocatalytic activities of the Ni₃N/Ru/NCAC composites remarkably outperform those of the state-of-the-art IrO₂ catalysts, and their HER activities were comparable to those of the benchmark Pt/C catalysts. Moreover, when the Ni₃N/Ru/NCAC composites are used as both anodes and cathodes of electrolyzers for overall water splitting (OWS), they delivered a lower voltage of 1.55 V at a current density of 10 mA cm⁻² and better durability than Pt/C(−)//IrO₂(+) electrodes. These outstanding OER/HER bifunctional activities and OWS performances of the Ni₃N/Ru/NCAC composites are ascribed to the collaborative contributions of N, Ru, Ni₃N and their large surface areas.

中文翻译：

使用煤基活性炭可控合成用于全水分解的高活性双功能电催化剂

我们报告了一种简便的方法，用于合成用于析氧反应 (OER) 和析氢反应 (HER) 的高活性双功能电催化剂，只需将廉价的煤基活性炭 (CAC)、氯化钌和氯化镍的混合物在氨。电催化剂由氮掺杂的 CACs (NCACs) 组成，它们均匀地装饰有钌 (Ru)（含量低至 0.3 wt%）和氮化镍 (Ni ₃ N) 纳米粒子（Ni ₃ N/Ru/NCAC 复合材料）。Ni ₃ N/Ru/NCAC 复合材料具有较大的表面积（853 m ² g ^-1)，这被证明是由于 CAC 固有的大表面积和在氨中退火过程中 CAC 易于蚀刻。电化学测量表明，Ni ₃ N/Ru/NCAC 复合材料的 OER 电催化活性明显优于最先进的 IrO ₂催化剂，其 HER 活性与基准 Pt/C 催化剂相当。此外，当 Ni ₃ N/Ru/NCAC 复合材料同时用作全水分解 (OWS) 电解槽的阳极和阴极时，它们在 10 mA cm ^-2的电流密度下提供了 1.55 V 的较低电压和更好的耐久性比 Pt/C(−)//IrO ₂(+) 电极。_{Ni 3} N/Ru/NCAC 复合材料的这些出色的 OER/HER 双功能活性和 OWS 性能归因于 N、Ru、Ni ₃ N 及其大表面积的协同贡献。

更新日期：2022-11-11

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