通过控制氧气空缺和结构障碍,通过-处理来提高-铁层双氧的氧气进化性能
Xifan Chen1, Yameng Zhang1, Jia Yang1
1Institutes of Physical Science and Information Technology, Anhui Graphene Materials Research Center, Key Laboratory of Structure and Functional Regulation of Hybrid Materials of Ministry of Education, Anhui University, Hefei 230601, China.
Inorganic chemistry
|November 21, 2023
概括
一种新的n-丁处理在铁层双氧化物 (NiFe-LDHs) 中产生氧空缺,提高它们作为氧化演化反应 (OER) 催化剂的性能. 这种方法为催化剂修改提供了一个新的策略.
科学领域:
- 材料科学 材料科学 材料科学
- 电化学 电化学 电化学
- 催化剂是一种催化剂.
背景情况:
- 基于铁的分层双氧化物 (NiFe-LDHs) 是氧化演化反应 (OER) 的经济有效的催化剂.
- 已知氧气空缺可以增强NiFe-LDHs的催化活性.
- 控制性地在NiFe-LDH中引入均的氧空位仍然是一个重大挑战.
研究的目的:
- 开发一种方法,可控制地在NiFe-LDH中引入氧气空缺.
- 调查这些空缺职位对OER催化活动和稳定性的影响.
- 探索开发的方法对其他电催化剂的适用性.
主要方法:
- 采用了一种新的治疗方法,包括使用n-丁进行深度还原,然后在低温下进行部分氧化.
- 这种方法可以选择性地将Ni降低到合金状态,同时不影响Fe,从而诱导结构转变.
- 处理的结果是富含氧缺陷的无形/晶体NiFe-LDHs.
主要成果:
- 经过处理的NiFe-LDHs表现出高的OER活性,在10 mA cm-2时具有223 mV的超电位,其性能优于商业的IrO2.
- 催化剂在氧气演化反应过程中表现出极好的长期稳定性.
- 对CoFe-LDHs和IrO2成功应用了n-丁处理,改善了它们的OER性能.
结论:
- 减少/部分氧化n-丁是一种有效的自上而下的策略,用于调整电催化剂中的缺陷结构.
- 这种方法可以对金属氧化物结构进行可控的修改,以增强催化应用.
- 开发的方法显示了通过改进的电催化剂设计来推进与能源相关的技术的前景.
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