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Proton alternate membrane (PEM) water electrolysis is taken into account a promising expertise for inexperienced hydrogen manufacturing, and iridium (Ir)-based catalysts are one of the best supplies for anodic oxygen evolution reactions (OER) owing to their excessive stability and anti-corrosion means in a powerful acid electrolyte. The properties of Ir-based nanocatalysts could be tuned by rational dimension engineering, which has acquired intensive consideration not too long ago for catalysis means boosting. To attain a complete understanding of the structural and catalysis efficiency, herein, an summary of the latest progress was supplied for Ir-based catalysts with totally different dimensions for the acidic OER. The promotional impact was first introduced by way of the nano-size impact, synergistic impact, and digital impact based mostly on the dimensional impact, then the newest progress of Ir-based catalysts labeled into zero-dimensional (0D), one-dimensional (1D), two-dimensional (2D) and three-dimensional (3D) catalysts was launched intimately; and the sensible software of some typical examples in the actual PEM water electrolyzers (PEMWE) was additionally introduced. Lastly, the issues and challenges confronted by present dimensionally engineered Ir-based catalysts in acidic electrolytes had been mentioned. It’s concluded that the elevated floor space and catalytic energetic websites could be realized by dimensional engineering methods, whereas the controllable synthesis of various dimensional structured catalysts remains to be an important problem, and the correlation between construction and efficiency, particularly for the structural evolution throughout the electrochemical operation course of, ought to be probed in depth. Hopefully, this effort may assist perceive the progress of dimensional engineering of Ir-based catalysts in OER catalysis and contribute to the design and preparation of novel environment friendly Ir-based catalysts.
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