Morphological and Coordination Modulations in Iridium Electrocatalyst for Robust and Stable Acidic OER Catalysis

Abstract

Proton exchange membrane water splitting (PEMWS) technology has high‐level current density, high operating pressure, small electrolyzer‐size, integrity, flexibility, and has good adaptability to the volatility of wind power and photovoltaics, but the development of both active and high stability of the anode electrocatalyst in acidic environment is still a huge challenge, which seriously hinders the promotion and application of PEMWS. In recent years, researchers have made tremendous attempts in the development of high‐quality active anode electrocatalyst, and we summarize some of the research progress made by our group in the design and synthesis of PEMWS anode electrocatalysts with different nanostructures, and makes full use of electrocatalytic activity points to increase the inherent activity of Iridium (Ir) sites, and provides optimization strategies for the long‐term non‐decay of catalysts under high anode potential in acidic environments. At this stage, these research advances are expected to facilitate the research and technological progress of PEMWS, and providing some research ideas and references for future research on efficient and inexpensive PEMWS anode electrocatalysts.

Modulating the geometrical sites of cobalt phosphates by autologous pyrolysis for electrocatalytic water oxidation

“…The electronic/geometric structure of metal centers in OECs plays a significant role in the catalytic activity and stability. 6 In particular, the coordination modulation of metal Co atoms in cobalt-containing catalysts results in different OER behaviors. 7,8 In spinel Co 3 O 4 , octahedral Co 3+ (Co 3+ Oh ) with a higher oxidation state dominates the water oxidation reaction rather than the tetrahedral Co 2+ (Co 2+ Td ).…”