To commercialize hydrogen production by proton exchange membrane (PEM) electrolysis, the amount of rare and precious metal (iridium) required for anodic oxygen evolution reaction (OER) must be greatly reduced. In order to solve the problem, carrier loading is used to reduce the amount of iridium. Unlike the carrier modified by conventional metal element doping, this work doped the carrier with the nonmetallic element and then prepared IrO 2 /TiB x O 2 composite catalyst using the Adams melting method. B-doped TiO 2 supports with different doping amounts show the main phase rutile structure. Among them, the conductivity of B-doped carrier shows an increasing trend with the increase of doping amount, because boron can form holes and negative centers after doping, and more carriers improve the conductivity of the support. In addition, since element B is manifested from inside to outside on the support, B can affect the catalytic process. After the manifestation of element B, the carrier loaded with IrO 2 exhibited superior electrocatalytic properties. The voltammetric charge per unit mass of 40IrO 2 /TiB 0.3 O 2 #2 (where #2 represents B after manifestation) reaches 1970 mC (cm 2 mg) −1 , the corresponding overpotential is 273 mV at a current density of 10 mA/cm −2 , and the Tafel slope is 61.9 mV/dec Also, the charge transfer resistance is only 15 Ω. Finally, in the stability test, the composite catalyst is also better than pure IrO 2 in the 20 000 s operation. Therefore, element B has an unexpectedly positive effect on the catalytic progress on the surface of the support after its manifestation.
The development of an electrochemical hydrogen evolution catalyst with high activity and low Pt loading and excellent stability is of high significance for the extensive promotion and practical application of hydrogen energy. Hence, we introduced ZIFs and their derivatives with tunable pore size and large specific surface area, which were carbonized at high temperatures and supported with Pt as catalysts for hydrogen evolution reaction. We used ZIF‐8 as the seed to obtain the precursor Co@ZIFs, W element was introduced into Co@ZIFs by impregnation method to synthesize WC. A series of Pt/WC catalysts were prepared with WC as support. The best sample Pt/WC‐3 in 0.5 M H2SO4 with a Pt content of 8.3 wt % has a low overpotential (η10=28 mV), which is much less than the 34 mV of 20% commercial Pt/C and had a Tafel slope of only 18.9 mV dec−1. It is noteworthy that at 8.3% Pt/WC after 40,000 s of continuous operation at 10 mA cm−2, the overpotential of Pt/WC‐3 barely rises by 5%, which indicates its excellent durability.
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