One-step electroreductively deposited iron-cobalt composite films as efficient bifunctional electrocatalysts for overall water splitting

Liu, Wanglian; Du, Kuangzhou; Liu, Lu; Zhang, Jinxuan; Zhu, Zhiwei; Shao, Yuanhua; Li, Meixian

doi:10.1016/j.nanoen.2016.11.047

Cited by 62 publications

(32 citation statements)

References 49 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The synergistic effect between α-Co 0.9 Fe 0.1 (OH) x and NF accounts for the enhanced HER activity. Such excellent overall water splitting performance of 2D site-enriched α-CoFe(OH) x nanoplate outperforms reported CoÀ Fe hydroxide electrocatalysts [14][15] and FeCo alloys and Co 4 N hybrid. As expected, the α-Co 0.9 Fe 0.1 (OH) x /NF can effectively catalyze water splitting with a cell voltage of 1.62 V to achieve 10 mA cm À 2 and a cell voltage of 1.83 V to achieve 50 mA cm À 2 (Figure 6a).…”

Section: Resultsmentioning

confidence: 72%

“…The catalytic activity of Co 0.9 Fe 0.1 (OH) x is remarkably higher than the other samples. As illustrated in Table S2, the overpotential of α-Co 0.9 Fe 0.1 (OH) x at 10 mA cm À 2 is also lower than that of reported FeÀ Co composite films, [14] Fe incorporated α-Co(OH) 2 nanosheets, [13] H 2 O-plasma-exfoliated CoFe LDH and acidetched CoFe LDH. The polarization curve of α-Co 0.9 Fe 0.1 (OH) x reveals a superior onset potential of 1.47 V, which is much lower than other samples.…”

Section: Resultsmentioning

confidence: 82%

“…[14] Kim et al electrodeposited CoÀ Fe hydroxide nanosheets on nickel foam thus to make it only need 220 mV overpotential for OER and 1.64 V for overall water splitting to reach 10 mA cm À 2 current density. CoÀ Fe electrocatalysts deposited on these substrates show enhanced OER and overall water splitting performances.…”

Section: Introductionmentioning

confidence: 99%

“…[11,[14][15] Fe element were incorporated into α-Co(OH) 2 , which effectively regulates the electronic structure of Co species to achieve enhanced intrinsic reactivity.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Electroactive Edge‐Site‐Enriched α‐Co_0.9Fe_0.1(OH)_x Nanoplates for Efficient Overall Water Splitting

Liu

Yuan

et al. 2019

ChemElectroChem

View full text Add to dashboard Cite

Developing efficient electrocatalysts from the earth-abundant transition-metal family is a great challenge for overall water splitting. Herein, we developed an approach to regulate the morphology and electronic structure of α-Co 0.9 Fe 0.1 (OH) x nanoplates, in which FeCl 2 (as a precursor) plays a significant role under reflux conditions. The resulting 2D α-Co 0.9 Fe 0.1 (OH) x nanoplates exhibit more accessible edge active sites and more high-valence Co species to boost its intrinsic activity. Therefore, this electrocatalyst shows outstanding oxygen evolution reaction performance (with an overpotential of 225 mV at 10 mA cm À 2 and a Tafel slope of 39 mV dec À 1 and good stability) and excellent activity toward the hydrogen evolution reaction (with an overpotential of 122 mV at 10 mA cm À 2 ) in 1M KOH solution. When employed as bifunctional electrocatalysts on both the anode and cathode for overall water splitting, α-Co 0.9 Fe 0.1 (OH) x can afford 10 mA cm À 2 at 1.62 V with long-term stability. The one-pot synthesis of 2D Fe-doped transition-metal hydroxide nanoplates enriched with abundant edge sites may provide a new strategy for fabricating efficient overall water splitting catalysts.

show abstract

Section: Resultsmentioning

confidence: 72%

Section: Resultsmentioning

confidence: 82%

Section: Introductionmentioning

confidence: 99%

“…[11,[14][15] Fe element were incorporated into α-Co(OH) 2 , which effectively regulates the electronic structure of Co species to achieve enhanced intrinsic reactivity.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Electroactive Edge‐Site‐Enriched α‐Co_0.9Fe_0.1(OH)_x Nanoplates for Efficient Overall Water Splitting

Liu

Yuan

et al. 2019

ChemElectroChem

View full text Add to dashboard Cite

show abstract

“…[86][87][88][89][90][91][92][93][94][95][96][97][98][99][100][101] Various synthesis methods have been used to fabricate nanostructured catalysts such as electrodeposition, hydrothermal methods, and template synthesis. Jin and co-workers reported the sandwich-like coaxial structure of Ni@[Ni (2+/3+) Co 2 (OH) [6][7] x nanotubes for an OER catalyst electrode.…”

Section: Nanostructured and Hybrid-structured Ldhmentioning

confidence: 99%

Recent Progress on Multimetal Oxide Catalysts for the Oxygen Evolution Reaction

Kim

et al. 2018

Advanced Energy Materials

664

498

View full text Add to dashboard Cite

fossil fuels are being widely researched for the development of a sustainable energy system. Among the various candidates for green energy resources, hydrogen energy has been at the center of attention. [1,2] Hydrogen is both inexhaustible and environmentally friendly, because it can be produced from earth-abundant reactants such as water and methane and because no CO 2 or other toxic products are emitted during its conversion into other energy form such as electricity, respectively. Moreover, hydrogen can exhibit significantly larger energy density compared with other energy sources such as gasoline and coal. The most widely used method of hydrogen production today is steam reforming because of its low cost in the process. [3] Nevertheless, the release of carbon monoxide or carbon dioxide as byproducts in the steam reforming process diminishes the environmental merits of hydrogen energy. Thus, as a possible cleaner alternative, an electrolysis method that involves producing hydrogen by electrochemically splitting water has been extensively investigated. Using one of the most abundant resources, water, the production of hydrogen from it yields only oxygen as a byproduct.In the water electrolysis, the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) occur simultaneously, as described by the following equationsIn order for the reaction to proceed, a voltage of 1.23 V is theoretically required between an anode and a cathode. However, an overpotential (represented by the symbol η) should be additionally applied to account for the potential loss resulting from kinetic limitations occurring during the electrochemical reaction. The use of electrocatalysts can lower the overpotential by kinetically facilitating the water-splitting reaction either in HER or OER. Due to the nature of four-electron involving OER, it is generally believed that the OER is much more sluggish than the HER; thus, the development of efficient OER Hydrogen is a promising alternative fuel for efficient energy production and storage, with water splitting considered one of the most clean, environmentally friendly, and sustainable approaches to generate hydrogen. However, to meet industrial demands with electrolysis-generated hydrogen, the development of a low-cost and efficient catalyst for the oxygen evolution reaction (OER) is critical, while conventional catalysts are mostly based on precious metals. Many studies have thus focused on exploring new efficient nonprecious-metal catalytic systems and improving the understandings on the OER mechanism, resulting in the design of catalysts with superior activity compared with that of conventional catalysts. In particular, the use of multimetal rather than single-metal catalysts is demonstrated to yield remarkable performance improvement, as the metal composition in these catalysts can be tailored to modify the intrinsic properties affecting the OER. Herein, recent progress and accomplishments of multimetal catalytic systems, including several important groups of catalysts: layered h...

show abstract

Engineering an Earth‐Abundant Element‐Based Bifunctional Electrocatalyst for Highly Efficient and Durable Overall Water Splitting

Kang

Guo

et al. 2019

Adv Funct Materials

155

View full text Add to dashboard Cite

The simultaneous and efficient evolution of hydrogen and oxygen with earth-abundant, highly active, and robust bifunctional electrocatalysts is a significant concern in water splitting. Herein, non-noble metalbased Ni-Co-S bifunctional catalysts with tunable stoichiometry and morphology are realized. The engineering of electronic structure and subsequent morphological design synergistically contributes to significantly elevated electrocatalytic performance. Stable overpotentials (η 10 ) of 243 mV (vs reversible hydrogen electrode) for oxygen evolution reaction (OER) and 80 mV for hydrogen evolution reaction (HER), as well as Tafel slopes of 54.9 mV dec −1 for OER and 58.5 mV dec −1 for HER, are demonstrated. In addition, density functional theory calculations are performed to determine the optimal electronic structure via the electron density differences to verify the enhanced OER activity is related to the Co top site on the (110) surface. Moreover, the tandem bifunctional NiCo 2 S 4 exhibit a required voltage of 1.58 V (J = 10 mA cm −2 ) for simultaneous OER and HER, and no obvious performance decay is observed after 72 h. When integrated with a GaAs solar cell, the resulting photoassisted water splitting electrolyzer shows a certified solar-to-hydrogen efficiency of up to 18.01%, further demonstrating the feasibility of engineering protocols and the promising potential of bifunctional NiCo 2 S 4 for large-scale overall water splitting.

show abstract

One-step electroreductively deposited iron-cobalt composite films as efficient bifunctional electrocatalysts for overall water splitting

Cited by 62 publications

References 49 publications

Electroactive Edge‐Site‐Enriched α‐Co_0.9Fe_0.1(OH)_x Nanoplates for Efficient Overall Water Splitting

Electroactive Edge‐Site‐Enriched α‐Co_0.9Fe_0.1(OH)_x Nanoplates for Efficient Overall Water Splitting

Recent Progress on Multimetal Oxide Catalysts for the Oxygen Evolution Reaction

Engineering an Earth‐Abundant Element‐Based Bifunctional Electrocatalyst for Highly Efficient and Durable Overall Water Splitting

Contact Info

Product

Resources

About

One-step electroreductively deposited iron-cobalt composite films as efficient bifunctional electrocatalysts for overall water splitting

Cited by 62 publications

References 49 publications

Electroactive Edge‐Site‐Enriched α‐Co0.9Fe0.1(OH)x Nanoplates for Efficient Overall Water Splitting

Electroactive Edge‐Site‐Enriched α‐Co0.9Fe0.1(OH)x Nanoplates for Efficient Overall Water Splitting

Recent Progress on Multimetal Oxide Catalysts for the Oxygen Evolution Reaction

Engineering an Earth‐Abundant Element‐Based Bifunctional Electrocatalyst for Highly Efficient and Durable Overall Water Splitting

Contact Info

Product

Resources

About

Electroactive Edge‐Site‐Enriched α‐Co_0.9Fe_0.1(OH)_x Nanoplates for Efficient Overall Water Splitting

Electroactive Edge‐Site‐Enriched α‐Co_0.9Fe_0.1(OH)_x Nanoplates for Efficient Overall Water Splitting