Cryptomelane nanorods coated with Ni ion doped Birnessite polymorphs as bifunctional efficient catalyst for the oxygen evolution reaction and degradation of organic contaminants,Applied Organometallic Chemistry

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Cryptomelane nanorods coated with Ni ion doped Birnessite polymorphs as bifunctional efficient catalyst for the oxygen evolution reaction and degradation of organic contaminants
Applied Organometallic Chemistry ( IF 3.7 ) Pub Date : 2021-09-02 , DOI: 10.1002/aoc.6432
Mustafa Ulvi Gürbüz ₁ , Gökhan Elmacı ₂ , Yajun Zhang ₃ , Xu Meng ₃ , Ali Serol Ertürk ₄

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The intelligent design or development of dual-functional catalysts using non-precious metals especially for the oxygen evolution reaction (OER) in sustainable energy systems and degradation of organic pollutants is still a difficult and a significant challenge. Furthermore, the development of these catalysts is of great importance in terms of energy security and solution of the environmental problems. To meet these requirements, herein, we describe the synthesis of a Ni-ion doped Birnessite@Cryptomelane (Ni²⁺/B@Cr) hybrid structure as a bifunctional efficient catalyst for the OER in neutral media and degradation of dye pollutants. The Ni²⁺/B@Cr catalyst exhibited a sharp onset potential at 390 mV (vs. RHE) and achieved a current density of 1 mA cm⁻² at a low ƞ of 430 mV with a Tafel slope of ~96 mV dec⁻¹. The results of electrochemical impedance spectroscopy (EIS) studies indicated that Ni intercalation into birnessite layer and heterostructure of the hybrid electrocatalyst Ni²⁺/B@Cr increased the conductivity by lowering the resistance of charge transfer (R_ct = 4.82 Ω) and oxygen evolution processes (R_OER = 4.13 Ω). The durability assay identified Ni²⁺/B@Cr as stable electrocatalyst with 10% loss of activity after long-term stability tests (10 h, under 500-mV overpotential). In addition, the Ni²⁺/B@Cr achieved high (86.67 s⁻¹ g⁻¹) and rapid (173 s) catalytic performance for the reduction of methylene blue (MB). Overall, this paper presents a low-cost production strategy for the design of highly efficient bifunctional catalysts, offering boosted electrocatalytic and degradation performance for water oxidation and organic dye contamination, respectively.

中文翻译：

用镍离子掺杂的水钠锰矿多晶型包覆的隐密烷纳米棒作为析氧反应和有机污染物降解的双功能高效催化剂

智能设计或开发使用非贵金属的双功能催化剂，特别是用于可持续能源系统中的析氧反应（OER）和有机污染物的降解，仍然是一项艰巨而重大的挑战。此外，这些催化剂的开发对于能源安全和环境问题的解决具有重要意义。为了满足这些要求，在本文中，我们描述了镍离子掺杂的 Birnessite@Cryptomelane (Ni ²⁺ /B@Cr) 混合结构的合成，作为中性介质中 OER 和染料污染物降解的双功能高效催化剂。Ni ²⁺ /B@Cr 催化剂在 390 mV (vs. RHE) 下表现出急剧的起始电位，并在低电流密度下实现了 1 mA cm ^-2的电流密度。ƞ为 430 mV，Tafel 斜率为 ~96 mV dec ^-1。电化学阻抗谱 (EIS) 研究结果表明，Ni 嵌入水钠锰矿层和混合电催化剂 Ni ²⁺ /B@Cr 的异质结构通过降低电荷转移电阻 (R _ct = 4.82 Ω) 和析氧来提高电导率过程（R _OER = 4.13 Ω）。耐久性试验确定 Ni ²⁺ /B@Cr 是稳定的电催化剂，在长期稳定性测试（10 小时，在 500-mV 过电位下）后活性损失 10%。此外，Ni ²⁺ /B@Cr 达到了高 (86.67 s ^-1 g ^-1) 和快速 (173 s) 的还原亚甲基蓝 (MB) 的催化性能。总的来说，本文提出了一种设计高效双功能催化剂的低成本生产策略，分别为水氧化和有机染料污染提供了增强的电催化和降解性能。

更新日期：2021-09-02

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