PtNi Supported on ZIF-Derived Porous Carbon as a High-Efficiency Acidic Hydrogen Evolution Catalyst

Abstract

Hydrogen production by water cracking is an important means to solve the energy crisis and environmental problems. Low-Pt-content electrocatalysts can keep better balance between activity and cost. In this paper, we propose a simple and effective synthesis method to synthesize a bimetallic porous nitrogen-doped carbon (BMNC)-supported ultrafine Pt x Ni y alloy hydrogen evolution reaction (HER) catalyst. BMNC is derived from a Zn−Co zeolite imidazolate skeleton (ZIFS) and can be used as a highefficiency catalyst support for the HER in acidic solutions. The optimal sample Pt 2 Ni 2 /BMNC with a Pt content of 8.4 wt % shows superior performance with the lowest overpotential (η 10 = 27 mV) and the smallest Tafel slope (17.7 mV dec −1 ), which is attributed to the merits of smaller charge transfer resistance, porous carbon support, and the alloy effect between Pt and Ni. After continuous working for 36 000 s at a voltage of −0.272 V, there is 10.6% decay of catalyst potential. We hope that this work can provide useful information to prepare efficient HER electrocatalysts.

Electrolytic Hydrogen Evolution Study of Porous Tungsten Carbide‐Loaded Pt Derived from ZIFs

“…It is important to note that the Co 3 W 3 C diffraction peaks can also be seen in Figure 2, and their peak positions are at 39.85° and 42.4°, respectively, which correspond to the Co 3 W 3 C crystal face (422) and (511). The appearance of the Co 3 W 3 C phase proves that we have successfully doped Co elements into WC, [14] which demonstrates the feasibility of the idea of doping WC with Co, [15] Nevertheless, From the XRD pattern of Pt/WC‐3, the appearance of the Co 3 W 3 C phase was not observed. We speculate that it may be that the content of the Co 3 W 3 C phase is relatively low and its position is closer to the position of the diffraction peak of Pt, thus the diffraction peak of the Co 3 W 3 C phase was not found in the XRD pattern of Pt/WC‐3.…”

PtNi Alloy Coated in Porous Nitrogen-Doped Carbon as Highly Efficient Catalysts for Hydrogen Evolution Reactions

“…It is evident that the sample obtained from carbonization temperature of 900 • C exhibited the largest specific surface area among the three tested samples. This could suggest that the incomplete carbonization induced a less rough surface at 800 • C and the agglomeration of the derived carbon materials at 1000 • C are responsible for the relatively low specific surface area [20]. Evidently, the large specific surface area is beneficial to generation of active sites after the deposition of catalysts, which in turn can improve the utilization rate of the precious metal and the catalytic activity of the catalyst.…”

Nickel–Copper Alloy Nanoparticles Embedded in N-Doped Porous Carbon Nanosheets for Supercapacitors and Hydrogen Evolution Reaction

“…8 More recently, Xu et al found that creating hierarchical pores and heteroatom doping in the carbon framework can further modulate the electrochemical activity of bimetallic alloy@ carbon. 23 Nonetheless, the fabrication of traditional bimetallic alloy@carbon hybrids has to resort to a complex synthetic process, template assistance, or harsh processing conditions, 24,25 which are time-consuming and not conducive to a large-scale fabrication of the desired materials. Moreover, the introduction of hierarchical pores and heteroatoms (such as N atom) in the carbon framework can further complicate the preparation of bimetallic alloy@carbon hybrids.…”

“…Meanwhile, the NiCu@C-1 delivered a better electrocatalytic activity and stability than the pure NiCu alloy . More recently, Xu et al found that creating hierarchical pores and heteroatom doping in the carbon framework can further modulate the electrochemical activity of bimetallic alloy@carbon . Nonetheless, the fabrication of traditional bimetallic alloy@carbon hybrids has to resort to a complex synthetic process, template assistance, or harsh processing conditions, , which are time-consuming and not conducive to a large-scale fabrication of the desired materials.…”