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一步实现铁掺杂和界面钌纳米团簇共同设计的泡沫镍负载氢氧化镍电催化剂用于促进析氧反应

One-step achievement of Fe-doped and interfacial Ru nanoclusters co-engineered Ni(OH) electrocatalyst on Ni foam for promoted oxygen evolution reaction.

作者信息

Liu Fuguang, Feng Zhonghan, Zhang Xinyue, Cui Liang, Liu Jingquan

机构信息

College of Materials Science and Engineering, Institute for Graphene Applied Technology Innovation, Qingdao University, Qingdao 266071, China.

College of Materials Science and Engineering, Linyi University, Linyi 276000, Shandong, China.

出版信息

J Colloid Interface Sci. 2023 May 15;638:498-505. doi: 10.1016/j.jcis.2023.01.037. Epub 2023 Jan 13.

Abstract

The creation of inexpensive, high-performance catalysts to reduce the overpotential of the oxygen evolution reaction (OER) process is critical for the electrolysis of water for hydrogen production. Therefore, we applied a one-step hydrothermal method using cation exchange reaction (CER) to prepare Fe-doped and interfacial Ru nanoclusters co-engineered Ni(OH) nanosheets directly grafted on Ni foam (Ru@Fe-Ni(OH)/NF) for OER process. Results of electrochemical tests reveal that Ru@Fe-Ni(OH)/NF has excellent OER activity, and its overpotential (η) is only 266.4 mV when the current density is 50 mA cm in 1 M KOH solution, even lower than that of commercial OER catalyst RuO (355 mV). The Tafel slope also decreases from 133.8 mV dec for pristine Ni(OH)/NF material to 24.1 mV dec for Ru@Fe-Ni(OH)/NF, indicating the higher charge transfer rates and fastest kinetics for water oxidation. At an overpotential of 300 mV the optimal turnover frequency (TOF) of 0.062 s for Ru@Fe-Ni(OH)/NF is achieved compared to that of Ni(OH)/NF (0.014 s, NN), demonstrating the fast reaction kinetics of the as-prepared electrocatcalyst. After 24 h stability test, the catalytic activity of Ru@Fe-Ni(OH)/NF was only attenuated by 2 %, showing excellent OER stability and durability. Our results show that we have successfully developed an efficient OER catalyst for green and efficient electrocatalytic hydrolysis to produce H and O, providing a promising method for clean H production.

摘要

开发廉价、高性能的催化剂以降低析氧反应(OER)过程的过电位对于水电解制氢至关重要。因此,我们采用阳离子交换反应(CER)的一步水热法制备了直接接枝在泡沫镍上的铁掺杂和界面钌纳米团簇共同设计的氢氧化镍纳米片(Ru@Fe-Ni(OH)/NF)用于OER过程。电化学测试结果表明,Ru@Fe-Ni(OH)/NF具有优异的OER活性,在1 M KOH溶液中电流密度为50 mA cm时其过电位(η)仅为266.4 mV,甚至低于商业OER催化剂RuO₂(355 mV)。塔菲尔斜率也从原始氢氧化镍/泡沫镍材料的133.8 mV dec⁻¹降至Ru@Fe-Ni(OH)/NF的24.1 mV dec⁻¹,表明水氧化的电荷转移速率更高且动力学最快。在300 mV的过电位下,Ru@Fe-Ni(OH)/NF的最佳周转频率(TOF)为0.062 s⁻¹,相比之下氢氧化镍/泡沫镍(0.014 s⁻¹),证明了所制备的电催化剂具有快速的反应动力学。经过24小时的稳定性测试后,Ru@Fe-Ni(OH)/NF的催化活性仅衰减了2%,显示出优异的OER稳定性和耐久性。我们的结果表明,我们已成功开发出一种用于绿色高效电催化水解以产生H₂和O₂的高效OER催化剂,为清洁制氢提供了一种有前景的方法。

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