Fabrication of SrSnO3/rGO composite via hydrothermal technique as robust electrocatalyst for OER process

IF 4.6 Q2 MATERIALS SCIENCE, BIOMATERIALS
Sumia Rubab, Sarah A. Alsalhi, A. Dahshan, Muhammad Aslam, Khursheed Ahmad, Albandari.W. Alrowaily
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Abstract

Developing effective and durable electrocatalysts for long-term energy conversion technologies is still an ongoing problem for researchers. For this purpose, perovskite oxides have attracted significant interest as effective electrocatalysts for oxygen evolution reactions (OER) in response to their highly adjustable catalytic and electrical properties associated with their compositions. This study presents a novel hydrothermal approach to fabricate SrSnO3/rGO composite in order to accelerate the four electron transfer mechanisms. Moreover, the physical analyses show that cubic-shaped SrSnO3 are irregularly dispersed in the form of spherical on the nanosheets of rGO. Compared with pristine, the BET study shows that composite exhibits a greater surface area (59 m2 g−1). To evaluate the catalytic kinetics, conductivity and stability, the electrochemical evaluation of the electrode material (SrSnO3/rGO) was performed in alkaline media with Ni foam (NF) as substrate. The exceptional electrocatalytic performance of the material in the OER could be associated with its unique structure, many active sites, and favorable conductivity. This performance is characterized by fast reaction rates, as indicated by a minimal Tafel constant (33 mV dec−1) along with reduced overpotential (199 mV) at 10 mA cm−2. Moreover, the chronoamperometry (CA) investigation of the SrSnO3/rGO composite indicates 35 h of long-term stability. This study presents a viable approach for producing high-performing perovskite composites for effective OER electrocatalysis.

Graphical Abstract

Abstract Image

Abstract Image

通过水热技术制备 SrSnO3/rGO 复合材料,作为 OER 过程的强效电催化剂
为长期能源转换技术开发有效、耐用的电催化剂仍然是研究人员面临的一个持续问题。为此,过氧化物氧化物作为氧进化反应(OER)的有效电催化剂引起了人们的极大兴趣,因为它们的催化和电特性与其组成相关,具有很强的可调性。本研究介绍了一种新型水热法制造 SrSnO3/rGO 复合材料,以加速四种电子转移机制。此外,物理分析表明,立方体 SrSnO3 以球形不规则地分散在 rGO 纳米片上。BET 研究表明,与原始材料相比,复合材料具有更大的比表面积(59 m2 g-1)。为了评估催化动力学、电导率和稳定性,以泡沫镍(NF)为基底,在碱性介质中对电极材料(SrSnO3/rGO)进行了电化学评估。该材料在 OER 中优异的电催化性能与其独特的结构、众多的活性位点和良好的导电性有关。这种性能的特点是反应速度快,在 10 mA cm-2 的条件下,塔菲尔常数(33 mV dec-1)最小,过电位(199 mV)降低。此外,对 SrSnO3/rGO 复合材料进行的时变测量(CA)研究表明,该材料具有 35 小时的长期稳定性。这项研究为生产高性能的包晶石复合材料以实现有效的 OER 电催化提供了一种可行的方法。
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来源期刊
ACS Applied Bio Materials
ACS Applied Bio Materials Chemistry-Chemistry (all)
CiteScore
9.40
自引率
2.10%
发文量
464
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