Metallic Iron–Nickel Sulfide Ultrathin Nanosheets As a Highly Active Electrocatalyst for Hydrogen Evolution Reaction in Acidic Media

Long, Xia; Li, Guixia; Wang, Zilong; Zhu, Houyu; Zhang, Teng; Xiao, Shuang; Guo, Wenyue; Yang, Shihe

doi:10.1021/jacs.5b07728

Cited by 613 publications

(403 citation statements)

References 41 publications

(21 reference statements)

Supporting

Mentioning

374

Contrasting

Unclassified

Order By: Relevance

“…A small Tafel slope is desirable to drive a large current at low overpotential, and metal sulfides usually exhibit Tafel slopes ranging from 40 to 120 mV/decade. 11,[43][44][45] The enhanced catalytic capability was confirmed by the EIS results, as the Nyquist plots ( Figure S11) for the Fe x Co 1−x S 2 (x = 0.98 to 0.32) exhibited substantially reduced charge-transfer resistance (R ct ) as compared to the Fe 1.00 Co 0.00 S 2 (Figure 5c). Among the Fe x Co 1−x S 2 , the lowest R ct of 23 was obtained at x = 0.68.…”

Section: Resultsmentioning

confidence: 73%

Cobalt-Doped Iron Sulfide as an Electrocatalyst for Hydrogen Evolution

Huang

Sodano

Leonard

et al. 2017

J. Electrochem. Soc.

View full text Add to dashboard Cite

Iron disulfide (FeS 2 ) promises an earth-abundant, low-cost alternative to platinum group metals for the hydrogen evolution reaction (HER), but its performance is currently limited by reactivity of active sites and poor electrical conductivity. Here we employ Ketjenblack (KB) as a support to create an Fe-based electrocatalyst with high-electrical conductivity and maximal active sites. Moreover, a systematic study on the role of cobalt (Co) dopant was carried out. Electrochemical results show enhancements in HER activity of Co-doped FeS 2 [Fe x Co 1−x S 2 , atomic content of Fe (x) = 0.98 -0.32] in comparison to un-doped FeS 2 in acidic electrolyte (pH = 0). The overpotential necessary to drive a current density of 10 mA/cm 2 is −0.150 V and only decreases by 1 mV after 500 cycles of a durability test (cycling the potential between 0.0 and −0.15 V), indicating a long-term durability in acidic environment. This work suggests that Fe x Co 1−x S 2 offers a viable approach to improve the activity and durability of transition metal-sulfide electrocatalysts.

show abstract

Section: Resultsmentioning

confidence: 73%

Cobalt-Doped Iron Sulfide as an Electrocatalyst for Hydrogen Evolution

Huang

Sodano

Leonard

et al. 2017

J. Electrochem. Soc.

View full text Add to dashboard Cite

show abstract

“…The Zn 2p XPS spectrum for the Ni 2.1 Zn(OH) x HNAs contained 2p 3/2 and 2p 1/2 doublets, which are characteristic of Zn 2+ (1022.7 eV and 1045.7 eV)34. Fe 2p 3/2 and Fe 2p 1/2 spin-orbital splitting for the Ni 2.2 Fe(OH) x HNAs was deconvolved into four peaks, indicating the coexistence of Fe 2+ (711.5 eV and 723.7 eV) and Fe 3+ (716.0 eV and 726.3 eV) in the Ni 2.2 Fe(OH) x HNAs3637. The O 1s spectrum of the Ni(OH) 2 HNAs was fit to a peak at a binding energy of 530.9 eV, which was assigned to the oxygen in hydroxide.…”

Section: Resultsmentioning

confidence: 95%

Transition metal ions regulated oxygen evolution reaction performance of Ni-based hydroxides hierarchical nanoarrays

Tingting

Cao

Zhang

et al. 2017

Sci Rep

112

View full text Add to dashboard Cite

Nickel-based hydroxide hierarchical nanoarrays (NiyM(OH)x HNAs M = Fe or Zn) are doped with non-noble transition metals to create nanostructures and regulate their activities for the oxygen evolution reaction. Catalytic performance in these materials depends on their chemical composition and the presence of nanostructures. These novel hierarchical nanostructures contain small secondary nanosheets that are grown on the primary nanowire arrays, providing a higher surface area and more efficient mass transport for electrochemical reactions. The activities of the NiyM(OH)x HNAs for the oxygen evolution reaction (OER) followed the order of Ni2.2Fe(OH)x > Ni(OH)2 > Ni2.1Zn(OH)x, and these trends are supported by density functional theory (DFT) calculations. The Fe-doped nickel hydroxide hierarchical nanoarrays (Ni2.2Fe(OH)x HNAs), which had an appropriate elemental composition and hierarchical nanostructures, achieve the lowest onset overpotential of 234 mV and the smallest Tafel slope of 64.3 mV dec−1. The specific activity, which is normalized to the Brunauer–Emmett–Teller (BET) surface area of the catalyst, of the Ni2.2Fe(OH)x HNAs is 1.15 mA cm−2BET at an overpotential of 350 mV. This is ~4-times higher than that of Ni(OH)2. These values are also superior to those of a commercial IrOx electrocatalyst.

show abstract

“…27–36 For example, greatly enhanced catalytic performances have been achieved by the pioneering 2D ultrathin nanosheets made by the Xie, 27–30 Wei, 27,28,31 Yang 32 and Zhang 33,34 groups. A huge mass activity for the oxygen evolution reaction has been achieved by well-designed ultrathin CoOOH solid nanosheets.…”

Section: Introductionmentioning

confidence: 99%