Ultrathin Iron‐Cobalt Oxide Nanosheets with Abundant Oxygen Vacancies for the Oxygen Evolution Reaction

Advanced Materials, Год журнала: 2017, Номер 29(17)

Опубликована: Фев. 27, 2017

Electrochemical water splitting is a promising method for storing light/electrical energy in the form of H 2 fuel; however, it limited by sluggish anodic oxygen evolution reaction (OER). To improve accessibility production, necessary to develop an efficient OER catalyst with large surface area, abundant active sites, and good stability, through low‐cost fabrication route. Herein, facile solution reduction using NaBH 4 as reductant developed prepare iron‐cobalt oxide nanosheets (Fe x Co y ‐ONSs) specific area (up 261.1 m g −1 ), ultrathin thickness (1.2 nm), and, importantly, vacancies. The mass activity Fe 1 ‐ONS measured at overpotential 350 mV reaches up 54.9 A , while its Tafel slope 36.8 dec ; both which are superior those commercial RuO crystalline ‐ONP, most reported catalysts. excellent catalytic can be attributed structure, e.g., that could facilitate diffusion/transport OH − ions provide more sites catalysis, vacancies electronic conductivity adsorption O onto nearby 3+ sites.

Язык: Английский

---

A mini review of NiFe-based materials as highly active oxygen evolution reaction electrocatalysts

Nano Research, Год журнала: 2014, Номер 8(1), С. 23 - 39

Опубликована: Ноя. 2, 2014

Язык: Английский

---

Interface Engineering of MoS₂/Ni₃S₂ Heterostructures for Highly Enhanced Electrochemical Overall‐Water‐Splitting Activity

Angewandte Chemie International Edition, Год журнала: 2016, Номер 55(23), С. 6702 - 6707

Опубликована: Апрель 21, 2016

Abstract To achieve sustainable production of H 2 fuel through water splitting, low‐cost electrocatalysts for the hydrogen‐evolution reaction (HER) and oxygen‐evolution (OER) are required to replace Pt IrO catalysts. Herein, first time, we present interface engineering novel MoS /Ni 3 S heterostructures, in which abundant interfaces formed. For OER, such heterostructures show an extremely low overpotential ca. 218 mV at 10 mA cm −2 , is superior that state‐of‐the‐art OER electrocatalysts. Using as bifunctional electrocatalysts, alkali electrolyzer delivers a current density very cell voltage 1.56 V. In combination with DFT calculations, this study demonstrates constructed synergistically favor chemisorption hydrogen oxygen‐containing intermediates, thus accelerating overall electrochemical splitting.

Язык: Английский

---

Ultrathin Spinel‐Structured Nanosheets Rich in Oxygen Deficiencies for Enhanced Electrocatalytic Water Oxidation

Angewandte Chemie International Edition, Год журнала: 2015, Номер 54(25), С. 7399 - 7404

Опубликована: Май 7, 2015

Electrochemical water splitting is a clean technology for H2 fuels, but greatly hindered by the slow kinetics of oxygen evolution reaction (OER). Herein, series spinel-structured nanosheets with deficiencies and ultrathin thicknesses were designed to increase reactivity number active sites catalysts, which then taken as an excellent platform promoting oxidation process. Theoretical investigations showed that vacancies confined in nanosheet could lower adsorption energy H2O, leading increased OER efficiency. As expected, NiCo2O4 rich exhibited large current density 285 mA cm(-2) at 0.8 V small overpotential 0.32 V, both are superior corresponding values bulk samples or few even higher than those most reported non-precious-metal catalysts. This work should provide new pathway design advanced

Язык: Английский

---

Oxygen and hydrogen evolution reactions on Ru, RuO 2 , Ir, and IrO 2 thin film electrodes in acidic and alkaline electrolytes: A comparative study on activity and stability

Catalysis Today, Год журнала: 2015, Номер 262, С. 170 - 180

Опубликована: Сен. 18, 2015

Язык: Английский

---