Journal Article10.1039/C9QI00453J
Activity enhancement of layered cobalt hydroxide nanocones by tuning interlayer spacing and phosphidation for electrocatalytic water oxidation in neutral solutions
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TL;DR: In this paper, three kinds of layered cobalt hydroxide nanocones (NCs) with tunable interlayer spacing determined by the intercalated anion species were prepared.
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Abstract: Due to the low cost, abundant reserves and redox-active features, electrocatalysts based on 3d transition metals have been thoroughly evaluated and are considered promising candidates to the current commercial noble metal-based materials. Designing elaborate structures and favorable phase composition is regarded as effective to improve the activity in electrocatalysis. Herein, three kinds of layered cobalt hydroxide nanocones (NCs) with tunable interlayer spacing determined by the intercalated anion species were prepared. Because of the larger interlayer spacing which might be beneficial for faster mass transfer, dodecyl sulfate (DS−) ion-intercalated layered cobalt hydroxide NCs yielded current densities of 5 and 10.65 mA cm−2 at overpotentials of 0.50 and 0.57 V, respectively, in the electrolytic oxygen evolution reaction (OER) in a neutral phosphate buffer solution (PBS); thus, they surpassed their counterparts with decreased layer distances induced by intercalated acetate (CH3COO−) or nitrate (NO3−) anions. When a further phosphidation treatment was adopted on NO3−-intercalated cobalt hydroxide NCs, a cobalt phosphide (CoP) product with well-maintained conical morphology was obtained, which reduced the overpotential of ∼20 mV to reach the anodic exchange current density of 5 mA cm−2. The activity enhancement induced by the tuning of interlayer spacing and phosphidation offers great promise for developing high-activity catalysts by rationally designing phase structure and composition for electrochemical energy conversion.
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Citations
Effect of Surface‐Adsorbed and Intercalated (Oxy)anions on the Oxygen Evolution Reaction
TL;DR: In this article , the role of anions in the oxygen evolution reaction (OER) has been investigated, and it was revealed that these thermodynamically stable (oxy)anions can adsorb on the surface or intercalate in the interlayer space of the active catalyst, changing the OER kinetics and potentially breaking the persisting OER scaling relations.
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Kazunori Takada,Hiroya Sakurai,Eiji Takayama-Muromachi,Fujio Izumi,Ruben A. Dilanian,Takayoshi Sasaki +5 more
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Transition-Metal (Co, Ni, and Fe)-Based Electrocatalysts for the Water Oxidation Reaction
Lei Han,Shaojun Dong,Erkang Wang +2 more
TL;DR: Recent progress on the design, synthesis, and application of OER electrocatalysts based on transition-metal elements, including Co, Ni, and Fe, is summarized, and some invigorating perspectives on the future developments are provided.
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Atomic cobalt on nitrogen-doped graphene for hydrogen generation
Huilong Fei,Juncai Dong,M. Josefina Arellano-Jiménez,Gonglan Ye,Nam Dong Kim,Errol L. G. Samuel,Zhiwei Peng,Zhuan Zhu,Fan Qin,Jiming Bao,Miguel Jose Yacaman,Pulickel M. Ajayan,Dongliang Chen,James M. Tour +13 more
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