Supercapacitor electrodes based on metal‐organic compounds from the first transition metal series

Abstract

Metal‐organic compounds, including molecular complexes and coordination polymers, have attracted much attention as electrode materials in supercapacitors owing to their large surface area, high porosity, tailorable pore size, controllable structure, good electrochemical reversibility, and abundant active sites. Among the variety of metal‐organic compounds exhibiting desired supercapacitor performances (high specific capacitance, long cycling life, high energy density, and power density), those with metals in the first transition metal series are the most studied due to their rich covalent states, light atom weight, environmental‐friendliness, non‐toxicity, and low cost. In this review, the recent reports on the metal‐organic compounds of the first transition metal series as electrode materials in supercapacitors are summarized and their electrode and device performances are discussed in terms of different metal elements and typical multidentate ligands. Moreover, the current challenges, design strategies, future opportunities and further research directions are also highlighted for metal‐organic compounds in the field of supercapacitors.

Tandem Self‐Powered Flexible Electrochromic Energy Supplier for Sustainable All‐Day Operations

“…For translucent devices, 10 nm Au and 240 nm MoO 3 were deposited sequentially. The effective area of solar cells is 0.09 cm 2 .…”

“…[1] The widely used flexible energy storage devices, for example, lithium-ion batteries (LIBs) and supercapacitors (SCs), have been regarded as powerful energy suppliers, but are unsustainable due to the periodical charging requirements. [2] Encouragingly, the emerging flexible energy harvesters show great potential for collecting energy from both environment and human body motion. Among them, organic photovoltaic (OPV) devices are promising for wearable electronics due to their superiorities in power-perweight, flexibility, semi-transparency, and applicability in outdoor and indoor light conditions.…”

Introducing a redox-active ferrocenyl moiety onto a polythiophene derivative towards high-performance flexible all-solid-state symmetric supercapacitors

“…However, they suffer from poor stability due to electrode swelling and shrinking caused by chemical reactions. 6 Typical pseudocapacitor electrode materials can be categorized into conductive polymers and metal compounds (such as metal–organic frameworks (MOFs), metal oxides, metal sulphates and so forth), and MOFs are particularly popular owing to their high redox activity arising from their intrinsic multi-covalence states. 7 The rigid molecular structures of the metal compounds, which are formed by the coordination configuration of the metal elements, can enhance the electrode stability by preventing the electrodes from undergoing deformation caused by chemical reactions.…”

Two binuclear silver(I) complexes containing V‐shaped bis (benzimidazole) ligands: Syntheses, structures, and electrochemical sensing toward hydrogen peroxide

“…The major classes of electrode materials applied in the field of electrochemistry include enzymes, metal oxides, metal complex composite electrode materials and so on. [16][17][18][19][20][21][22] Nevertheless, enzymes have expensive prices and metal oxides with low purity, these shortcomings greatly limit their application in practice. In contrast, metal complexes not only possess easily regulated structures and high purity, but more importantly, their modified carbon paste electrodes show the advantages of easy fabrication, cheap cost, rapid surface renewal and reusability.…”