Adaptive Bifunctional Electrocatalyst of Amorphous CoFe Oxide @ 2D Black Phosphorus for Overall Water Splitting

Li, Xingyun; Xiao, Liangping; Zhou, Ling; Xu, Qingchi; Weng, Jian; Xu, Jun; Liu, Bin

doi:10.1002/anie.202008514

Cited by 221 publications

(136 citation statements)

References 55 publications

Supporting

Mentioning

132

Contrasting

Order By: Relevance

“…The OER performance of CoFe PBA@CoP also exceeds most of the previously reported nonprecious OER electrocatalysts in alkaline media (Table S2, Supporting Information). [44][45][46][47][48][49][50][51][52] The stable amperometric i-t curve (Figure 5d) recorded at an overpotential of 180 mV further verified the extraordinary electrochemical OER stability. The possible mechanism of OER in KOH is displayed in Equation S3-7, Supporting Information.…”

Section: Resultsmentioning

confidence: 83%

Hierarchically Assembling CoFe Prussian Blue Analogue Nanocubes on CoP Nanosheets as Highly Efficient Electrocatalysts for Overall Water Splitting

Zhao

et al. 2021

Small Methods

View full text Add to dashboard Cite

At present, to boost the sluggish kinetic of the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER), precious Pt and Ir/Ru-based electrocatalysts are usually employed and acknowledged as benchmark in practical application. [3,4] However, their high cost has been considered as an insurmountable barrier. [5] Therefore, numerous efforts have been undertaken to exploit alternative electrocatalysts with cost-effective and high efficiency. [6][7][8] Moreover, bifunctional electrocatalysts are especially important from the technological point of view owing to their facility for cell assembly and reduced manufacture cost accordingly. [9] Among the booming earth-abundant alternatives, including transition metalbased oxide, [10] nitrides, [11] phosphides, [12] and selenides, [13] transition metal phosphides (TMPs) have sparked considerable attention due to their metalloid characteristics and superior electrical conductivity, thus demonstrated as promising bifunctional electrocatalysts. [14] Various approaches have been proposed to enhance the electrocatalytic performance of TMPs from the aspects of incorporation of foreign metal sites or surface coating, for example the preparation of bimetallic phosphide, [15] Cu 3 P coated by a N,Pcodoped carbon shell, [16] and CoP/TiO x heterostructure, [17] etc. Moreover, rational design of a catalyst with favorable electronic and geometric structure is also of prerequisite towards the rapid electron transfer and mass transport. [18] From this perspective, 2D TMPs nanosheets can serve as one of the most prospective candidates owing to their high surface area-to-volume ratio, highly exposed active sites, large contact area with electrolyte. Benefitted from the reduced thickness of TMPs nanosheets, the low-coordinated sites on the catalysts' surface including steps, edges, and kinks will be favorable for electrocatalytic process. [19,20] Nevertheless, due to the shrinkage and fusion caused by stress and decomposition, nanosheets are prone to collapse and thus the impaired electrocatalytic activities limit their application. In this regard, rational design of hierarchical heterostructures based on 2D TMPs nanosheets is highly desirable.Prussian blue (PB) and PB analogues (PBA) formed by coordination interaction between cyanide ligands and metal ions Efficient and durable electrocatalysts are highly desirable for overall water splitting. Herein, a facile strategy is demonstrated to rationally construct CoFe Prussian blue analogues (PBA)@CoP cube-on-sheet hierarchical structure by etching reaction with intermediated CoO to form PBA nanocubes. Benefitting from the heterostructured engineering, the as-synthesized CoFe PBA@CoP presents remarkable electrocatalytic performance in 1.0 m KOH, only requiring overpotentials of 100 mV for hydrogen evolution reaction (HER) and 171 mV for oxygen evolution reaction (OER) to reach the 10 mA cm −2 current density with good stability. Extraordinarily enhanced electrocatalytic performance is ascribed to not only the rapid charge transfer ...

show abstract

Section: Resultsmentioning

confidence: 83%

Hierarchically Assembling CoFe Prussian Blue Analogue Nanocubes on CoP Nanosheets as Highly Efficient Electrocatalysts for Overall Water Splitting

Zhao

et al. 2021

Small Methods

View full text Add to dashboard Cite

show abstract

“…Electrocatalytic oxygen and hydrogen production from water splitting is widely regarded as a promising way to solve the environmental problems and energy crisis. [1][2][3] Unfortunately, the two half reactions involving anode oxygen evolution reaction (OER) and cathode hydrogen evolution reaction (HER) require highly efficient and stable electrocatalysts to accelerate water splitting. Particularly, the electrocatalysts of OER always suffer a high overpotential owing to the sluggish four-electron reaction kinetics.…”

Section: Introductionmentioning

confidence: 99%

Preparation of Hollow Cobalt–Iron Phosphides Nanospheres by Controllable Atom Migration for Enhanced Water Oxidation and Splitting

Chen

Zhang

Liu

et al. 2021

Small

View full text Add to dashboard Cite

Transition metal phosphides (TMPs), especially the dual‐metal TMPs, are highly active non‐precious metal oxygen evolution reaction (OER) electrocatalysts. Herein, an interesting atom migration phenomenon induced by Kirkendall effect is reported for the preparation of cobalt–iron (Co–Fe) phosphides by the direct phosphorization of Co–Fe alloys. The compositions and distributions of the Co and Fe phosphides phases on the surfaces of the electrocatalysts can be readily controlled by CoxFey alloys precursors and the phosphorization process with interesting atom migration phenomenon. The optimized Co7Fe3 phosphides exhibit a low overpotential of 225 mV at 10 mA cm−2 in 1 m KOH alkaline media, with a small Tafel slope of 37.88 mV dec−1 and excellent durability. It only requires a voltage of 1.56 V to drive the current density of 10 mA cm−2 when used as both anode and cathode for overall water splitting. This work opens a new strategy to controllable preparation of dual‐metal TMPs with designed phosphides active sites for enhanced OER and overall water splitting.

show abstract

“…[3][4][5][6] Since the activities of electrocatalysts toward oxygen and hydrogen evolution reaction (OER and HER) determine the efficiency of electrocatalytic overall water splitting,t he rational design of high-performance electrocatalysts appears to be particularly significant. [7][8][9] In terms of activity and stability,e specially in the acidic environment, noble metals-based catalysts are still irreplaceable. [10][11][12][13] In addition, compared to the cathodic HER process,the four-electron OER process at the anode is considerably more sluggish, dominating the total potential of the overall water electrolyzers.…”

Section: Introductionmentioning

confidence: 99%

“…In particular, the electrochemical overall water splitting, representing one of the most eco‐friendly and high‐efficient techniques for hydrogen production, has been deemed to be an up‐and‐coming trend to realize such sustainable energy scheme [3–6] . Since the activities of electrocatalysts toward oxygen and hydrogen evolution reaction (OER and HER) determine the efficiency of electrocatalytic overall water splitting, the rational design of high‐performance electrocatalysts appears to be particularly significant [7–9] . In terms of activity and stability, especially in the acidic environment, noble metals‐based catalysts are still irreplaceable [10–13] .…”

Section: Introductionmentioning

confidence: 99%

Exclusive Strain Effect Boosts Overall Water Splitting in PdCu/Ir Core/Shell Nanocrystals

Zhao

Xia

et al. 2021

Angewandte Chemie

View full text Add to dashboard Cite

Core/shell nanocatalysts are ac lass of promising materials,w hicha chieve the enhanced catalytic activities through the synergy between ligand effect and strain effect. However,i th as been challenging to disentangle the contributions from the two effects,whichhinders the rational design of superior core/shell nanocatalysts.H erein, we report precise synthesis of PdCu/Ir core/shell nanocrystals,w hichc an significantly boost oxygen evolution reaction (OER) via the exclusive strain effect. The heteroepitaxial coating of four Ir atomic layers onto PdCu nanoparticle gives arelatively thickIr shell eliminating the ligand effect, but creates ac ompressive strain of ca. 3.60%. The strained PdCu/Ir catalysts can deliver al ow OER overpotential and ah igh mass activity.D ensity functional theory (DFT) calculations reveal that the compressive strain in Ir shell downshifts the d-band center and weakens the binding of the intermediates,c ausing the enhanced OER activity.The compressive strain also boosts hydrogen evolution reaction (HER) activity and the strained nanocrystals can be served as excellent catalysts for both anode and cathode in overall water-splitting electrocatalysis.

show abstract

Adaptive Bifunctional Electrocatalyst of Amorphous CoFe Oxide @ 2D Black Phosphorus for Overall Water Splitting

Cited by 221 publications

References 55 publications

Hierarchically Assembling CoFe Prussian Blue Analogue Nanocubes on CoP Nanosheets as Highly Efficient Electrocatalysts for Overall Water Splitting

Hierarchically Assembling CoFe Prussian Blue Analogue Nanocubes on CoP Nanosheets as Highly Efficient Electrocatalysts for Overall Water Splitting

Preparation of Hollow Cobalt–Iron Phosphides Nanospheres by Controllable Atom Migration for Enhanced Water Oxidation and Splitting

Exclusive Strain Effect Boosts Overall Water Splitting in PdCu/Ir Core/Shell Nanocrystals

Contact Info

Product

Resources

About