High valence metals engineering strategies of Fe/Co/Ni-based catalysts for boosted OER electrocatalysis

Atomically dispersed Mn atoms coordinated with N and O within an N-doped porous carbon framework for boosted oxygen reduction catalysis

“…However, rational design of stable and highly efficient nanomaterials with boosted ORR electrochemical activity in a wide pH range still remains a challenge, which severely hinders the practical applications of atomically dispersed metal-based electrocatalysts. 6,19,20…”

“…However, rational design of stable and highly efficient nanomaterials with boosted ORR electrochemical activity in a wide pH range still remains a challenge, which severely hinders the practical applications of atomically dispersed metal-based electrocatalysts. 6,19,20 Herein, a series of outstanding ORR electrocatalysts consisting of atomically dispersed metal sites (Mn, Fe, Co, Cu) anchored on porous N-doped carbon (M-SAs/NC) were successfully synthesized through a simple imidazole metal organic framework (ZIF)-assisted strategy. Benefitting from the hierarchical structure, high electrical conductivity, and strong electronic interactions between the N-doped carbon framework and the atomically dispersed metal sites, the obtained SACs exhibited high ORR catalytic activities.…”

Boosting oxygen evolution electrocatalysisviaCeO2engineering on Fe2N nanoparticles for rechargeable Zn–air batteries

“…Fe 3+ , Co 4+ ) often delivered a better OER catalytic activity. 20 In comparison to Fe, Co and Ni, 5d transition metals such as Ce tended to exhibit higher valences and their oxidation states were also defined as high-valent metal sites. Although high-valent Ce by itself cannot achieve an excellent OER catalytic activity, the incorporation of Ce into Fe-based catalysts was expected to enhance the OER catalytic activity because the multivalent nature of Ce would favor the electron exchange and transfer between the active sites.…”

A robust strategy to boost the proton transfer of heterogeneous catalysts for efficient and sustainable water oxidation towards practical applications

“…The ever-increasing environmental pollution and energy crisis have stimulated the development of various renewable energy systems or technologies to replace fossil fuels, such as overall water splitting, 1–5 metal–air batteries, 6 and the transformation of carbon dioxide to value-added compounds. 7 However, they all involve a kinetics-retarded electrochemical process, namely oxygen evolution reaction (OER) with multiple proton/electron transfer.…”