Interfacial Engineering of Cobalt Thiophosphate with Strain Effect and Modulated Electron Structure for Boosting Electrocatalytic Hydrogen Evolution Reaction

Abstract

The fabrication of heterojunctions is an intriguing approach to boost the reactivity of catalysts. However, facile preparation of desirable heterojunction materials remains a challenge. Here, novel CoPS3/CoS2 heterojunctions are created by an intuitive phosphatization process on the basis of structurally flexible cobalt sulfide precursors. Significant stress effect exists at these heterogeneous interfaces, resulting in lattice distortions and the exposure of more active sites. The interface interaction also modifies the catalyst's electronic structure to improve its electrical conductivity and hydrogen adsorption capabilities. Notably, the overpotential of the CoPS3/CoS2 heterojunction for electrocatalytic hydrogen evolution reaction is just 36.3 mV, which is far superior to those of single‐component catalysts and competitive with comparable catalysts reported. This work not only offers an innovative electrocatalyst but also a strategy that can be used to create heterojunctions based on related transition metal thiophosphates.

Promoting Nonacid Hydrogen Evolution over Ni4Mo/Cu by D-Band Regulation

“…As the weighted d-band center (Mo–Ni–Mo site) shows in Figure G, a clear downshift with respect to the Fermi level can be observed after interface construction. It suggests that antibonding energy states are lowered and the interaction between the surface and adsorbate is weakened, ,− which is consistent with UPS results. All of the above-mentioned results manifest that interface construction could endow Ni 4 Mo/Cu with enhanced HER activity.…”

Fe–Co-Based Metal–Organic Frameworks as Peroxidase Mimics for Sensitive Colorimetric Detection and Efficient Degradation of Aflatoxin B1

“…Metal–organic frameworks (MOFs) are emerging porous crystalline materials composed of metal ions or metal cluster nodes and organic ligands. , With the merits of controllable composition and pore size, high surface area, and abundant metal-active sites, MOFs have aroused great interest in many fields, such as gas storage and separation, catalysis, biosensing, and cancer therapy . In recent years, there have been an increasing number of studies on the use of materials for catalytic applications. − Interestingly, some MOFs possess intrinsic enzyme-mimicking activity since their metal sites can simulate the active centers of natural enzymes. , Among them, Fe-based MOFs (e.g., Fe-MIL-88) have both peroxidase-like activity for colorimetric detection , and Fenton-like catalytic degradation properties for the removal of organic pollutants. , In addition, to further improve the catalytic activity for monometallic Fe-based MOFs, some bimetallic Fe-based MOF mimics with good electronic structures and chemical properties have been reported because their bimetallic centers can produce synergistic effects, such as Fe–Cu-MOFs, Fe–Ni-MOFs, and Fe–Mn-MOFs . In particular, Jiang et al recently incorporated Co 2+ into Fe-MIL-88­(NH 2 ) to prepare a bimetallic Fe–Co-MOF, which displayed a higher peroxidase-like activity than the Fe-MIL-88­(NH 2 ) .…”

Donor–Acceptor Conjugated Porphyrin-Based Polymer for Excellent Hydrogen Evolution Reaction

“…5,6 Hence, the development of electrocatalysts using earth-abundant metals has been the subject of intensive research. 7,8 In particular, metalloporphyrins have come into sight as efficient HER catalysts in homogeneous conditions or heterogeneous conditions 9,10 and hence have aroused scientific and industrial attention owing to their low manufacturing cost, high availability, and eminent selectivity and reactivity. 11−13 Also, some unique strategies have been developed to use metalloporphyrins as organic building blocks for constructing porous polymers, which display structural periodicity, uniform topology, inherent porosity, and hence an improved activity.…”

“…In this regard, electrochemical hydrogen evolution reaction (HER) in an aqueous solution is appealing as electricity is a renewable energy source and water is an abundant source of protons. Catalysts integrating noble metals such as Pt and Ru could afford appealing performance toward HER, but the cost has greatly restricted their industrial potential. , Hence, the development of electrocatalysts using earth-abundant metals has been the subject of intensive research. , …”